first commit

api/app/__init__.py

@@ -0,0 +1,171 @@
+"""
+Flask application factory for Code of Conquest.
+
+Creates and configures the Flask application instance.
+"""
+
+import os
+from flask import Flask
+from flask_cors import CORS
+from app.config import get_config
+from app.utils.logging import setup_logging, get_logger
+
+
+def create_app(environment: str = None) -> Flask:
+    """
+    Application factory pattern for creating Flask app.
+
+    Args:
+        environment: Environment name (development, production, etc.)
+                    If None, uses FLASK_ENV from environment variables.
+
+    Returns:
+        Flask: Configured Flask application instance
+
+    Example:
+        >>> app = create_app('development')
+        >>> app.run(debug=True)
+    """
+    # Get the path to the project root (parent of 'app' package)
+    project_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+    # Create Flask app with correct template and static folders
+    app = Flask(
+        __name__,
+        template_folder=os.path.join(project_root, 'templates'),
+        static_folder=os.path.join(project_root, 'static')
+    )
+
+    # Load configuration
+    config = get_config(environment)
+
+    # Configure Flask from config object
+    app.config['SECRET_KEY'] = config.secret_key
+    app.config['DEBUG'] = config.app.debug
+
+    # Set up logging
+    setup_logging(
+        log_level=config.logging.level,
+        log_format=config.logging.format,
+        log_file=config.logging.file_path if 'file' in config.logging.handlers else None
+    )
+
+    logger = get_logger(__name__)
+    logger.info(
+        "Starting Code of Conquest",
+        version=config.app.version,
+        environment=config.app.environment
+    )
+
+    # Configure CORS
+    CORS(app, origins=config.cors.origins)
+
+    # Store config in app context
+    app.config['COC_CONFIG'] = config
+
+    # Register error handlers
+    register_error_handlers(app)
+
+    # Register blueprints (when created)
+    register_blueprints(app)
+
+    logger.info("Application initialized successfully")
+
+    return app
+
+
+def register_error_handlers(app: Flask) -> None:
+    """
+    Register global error handlers for the application.
+
+    Args:
+        app: Flask application instance
+    """
+    from app.utils.response import (
+        error_response,
+        internal_error_response,
+        not_found_response
+    )
+
+    logger = get_logger(__name__)
+
+    @app.errorhandler(404)
+    def handle_404(error):
+        """Handle 404 Not Found errors."""
+        logger.warning("404 Not Found", path=error.description)
+        return not_found_response()
+
+    @app.errorhandler(500)
+    def handle_500(error):
+        """Handle 500 Internal Server errors."""
+        logger.error("500 Internal Server Error", error=str(error), exc_info=True)
+        return internal_error_response()
+
+    @app.errorhandler(Exception)
+    def handle_exception(error):
+        """Handle uncaught exceptions."""
+        logger.error(
+            "Uncaught exception",
+            error=str(error),
+            error_type=type(error).__name__,
+            exc_info=True
+        )
+        return internal_error_response()
+
+
+def register_blueprints(app: Flask) -> None:
+    """
+    Register Flask blueprints (API routes and web UI views).
+
+    Args:
+        app: Flask application instance
+    """
+    logger = get_logger(__name__)
+
+    # ===== API Blueprints =====
+
+    # Import and register health check API blueprint
+    from app.api.health import health_bp
+    app.register_blueprint(health_bp)
+    logger.info("Health API blueprint registered")
+
+    # Import and register auth API blueprint
+    from app.api.auth import auth_bp
+    app.register_blueprint(auth_bp)
+    logger.info("Auth API blueprint registered")
+
+    # Import and register characters API blueprint
+    from app.api.characters import characters_bp
+    app.register_blueprint(characters_bp)
+    logger.info("Characters API blueprint registered")
+
+    # Import and register sessions API blueprint
+    from app.api.sessions import sessions_bp
+    app.register_blueprint(sessions_bp)
+    logger.info("Sessions API blueprint registered")
+
+    # Import and register jobs API blueprint
+    from app.api.jobs import jobs_bp
+    app.register_blueprint(jobs_bp)
+    logger.info("Jobs API blueprint registered")
+
+    # Import and register game mechanics API blueprint
+    from app.api.game_mechanics import game_mechanics_bp
+    app.register_blueprint(game_mechanics_bp)
+    logger.info("Game Mechanics API blueprint registered")
+
+    # Import and register travel API blueprint
+    from app.api.travel import travel_bp
+    app.register_blueprint(travel_bp)
+    logger.info("Travel API blueprint registered")
+
+    # Import and register NPCs API blueprint
+    from app.api.npcs import npcs_bp
+    app.register_blueprint(npcs_bp)
+    logger.info("NPCs API blueprint registered")
+
+    # TODO: Register additional blueprints as they are created
+    # from app.api import combat, marketplace, shop
+    # app.register_blueprint(combat.bp, url_prefix='/api/v1/combat')
+    # app.register_blueprint(marketplace.bp, url_prefix='/api/v1/marketplace')
+    # app.register_blueprint(shop.bp, url_prefix='/api/v1/shop')

api/app/ai/__init__.py

@@ -0,0 +1,61 @@
+"""
+AI integration module for Code of Conquest.
+
+This module contains clients and utilities for AI-powered features
+including narrative generation, quest selection, and NPC dialogue.
+"""
+
+from app.ai.replicate_client import (
+    ReplicateClient,
+    ReplicateResponse,
+    ReplicateClientError,
+    ReplicateAPIError,
+    ReplicateRateLimitError,
+    ReplicateTimeoutError,
+    ModelType,
+)
+
+from app.ai.model_selector import (
+    ModelSelector,
+    ModelConfig,
+    UserTier,
+    ContextType,
+)
+
+from app.ai.prompt_templates import (
+    PromptTemplates,
+    PromptTemplateError,
+    get_prompt_templates,
+    render_prompt,
+)
+
+from app.ai.narrative_generator import (
+    NarrativeGenerator,
+    NarrativeResponse,
+    NarrativeGeneratorError,
+)
+
+__all__ = [
+    # Replicate client
+    "ReplicateClient",
+    "ReplicateResponse",
+    "ReplicateClientError",
+    "ReplicateAPIError",
+    "ReplicateRateLimitError",
+    "ReplicateTimeoutError",
+    "ModelType",
+    # Model selector
+    "ModelSelector",
+    "ModelConfig",
+    "UserTier",
+    "ContextType",
+    # Prompt templates
+    "PromptTemplates",
+    "PromptTemplateError",
+    "get_prompt_templates",
+    "render_prompt",
+    # Narrative generator
+    "NarrativeGenerator",
+    "NarrativeResponse",
+    "NarrativeGeneratorError",
+]

api/app/ai/model_selector.py

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+"""
+Model selector for tier-based AI model routing.
+
+This module provides intelligent model selection based on user subscription tiers
+and context types to optimize cost and quality.
+"""
+
+from dataclasses import dataclass
+from enum import Enum, auto
+
+import structlog
+
+from app.ai.replicate_client import ModelType
+
+logger = structlog.get_logger(__name__)
+
+
+class UserTier(str, Enum):
+    """User subscription tiers."""
+    FREE = "free"
+    BASIC = "basic"
+    PREMIUM = "premium"
+    ELITE = "elite"
+
+
+class ContextType(str, Enum):
+    """Types of AI generation contexts."""
+    STORY_PROGRESSION = "story_progression"
+    COMBAT_NARRATION = "combat_narration"
+    QUEST_SELECTION = "quest_selection"
+    NPC_DIALOGUE = "npc_dialogue"
+    SIMPLE_RESPONSE = "simple_response"
+
+
+@dataclass
+class ModelConfig:
+    """Configuration for a selected model."""
+    model_type: ModelType
+    max_tokens: int
+    temperature: float
+
+    @property
+    def model(self) -> str:
+        """Get the model identifier string."""
+        return self.model_type.value
+
+
+class ModelSelector:
+    """
+    Selects appropriate AI models based on user tier and context.
+
+    This class implements tier-based routing to ensure:
+    - Free users get Llama-3 (no cost)
+    - Basic users get Claude Haiku (low cost)
+    - Premium users get Claude Sonnet (medium cost)
+    - Elite users get Claude Opus (high cost)
+
+    Context-specific optimizations adjust token limits and temperature
+    for different use cases.
+    """
+
+    # Tier to model mapping
+    TIER_MODELS = {
+        UserTier.FREE: ModelType.LLAMA_3_8B,
+        UserTier.BASIC: ModelType.CLAUDE_HAIKU,
+        UserTier.PREMIUM: ModelType.CLAUDE_SONNET,
+        UserTier.ELITE: ModelType.CLAUDE_SONNET_4,
+    }
+
+    # Base token limits by tier
+    BASE_TOKEN_LIMITS = {
+        UserTier.FREE: 256,
+        UserTier.BASIC: 512,
+        UserTier.PREMIUM: 1024,
+        UserTier.ELITE: 2048,
+    }
+
+    # Temperature settings by context type
+    CONTEXT_TEMPERATURES = {
+        ContextType.STORY_PROGRESSION: 0.9,  # Creative, varied
+        ContextType.COMBAT_NARRATION: 0.8,   # Exciting but coherent
+        ContextType.QUEST_SELECTION: 0.5,    # More deterministic
+        ContextType.NPC_DIALOGUE: 0.85,      # Natural conversation
+        ContextType.SIMPLE_RESPONSE: 0.7,    # Balanced
+    }
+
+    # Token multipliers by context (relative to base)
+    CONTEXT_TOKEN_MULTIPLIERS = {
+        ContextType.STORY_PROGRESSION: 1.0,   # Full allocation
+        ContextType.COMBAT_NARRATION: 0.75,   # Shorter, punchier
+        ContextType.QUEST_SELECTION: 0.5,     # Brief selection
+        ContextType.NPC_DIALOGUE: 0.75,       # Conversational
+        ContextType.SIMPLE_RESPONSE: 0.5,     # Quick responses
+    }
+
+    def __init__(self):
+        """Initialize the model selector."""
+        logger.info("ModelSelector initialized")
+
+    def select_model(
+        self,
+        user_tier: UserTier,
+        context_type: ContextType = ContextType.SIMPLE_RESPONSE
+    ) -> ModelConfig:
+        """
+        Select the appropriate model configuration for a user and context.
+
+        Args:
+            user_tier: The user's subscription tier.
+            context_type: The type of content being generated.
+
+        Returns:
+            ModelConfig with model type, token limit, and temperature.
+
+        Example:
+            >>> selector = ModelSelector()
+            >>> config = selector.select_model(UserTier.PREMIUM, ContextType.STORY_PROGRESSION)
+            >>> config.model_type
+            <ModelType.CLAUDE_SONNET: 'anthropic/claude-3.5-sonnet'>
+        """
+        # Get model for tier
+        model_type = self.TIER_MODELS[user_tier]
+
+        # Calculate max tokens
+        base_tokens = self.BASE_TOKEN_LIMITS[user_tier]
+        multiplier = self.CONTEXT_TOKEN_MULTIPLIERS.get(context_type, 1.0)
+        max_tokens = int(base_tokens * multiplier)
+
+        # Get temperature for context
+        temperature = self.CONTEXT_TEMPERATURES.get(context_type, 0.7)
+
+        config = ModelConfig(
+            model_type=model_type,
+            max_tokens=max_tokens,
+            temperature=temperature
+        )
+
+        logger.debug(
+            "Model selected",
+            user_tier=user_tier.value,
+            context_type=context_type.value,
+            model=model_type.value,
+            max_tokens=max_tokens,
+            temperature=temperature
+        )
+
+        return config
+
+    def get_model_for_tier(self, user_tier: UserTier) -> ModelType:
+        """
+        Get the default model for a user tier.
+
+        Args:
+            user_tier: The user's subscription tier.
+
+        Returns:
+            The ModelType for this tier.
+        """
+        return self.TIER_MODELS[user_tier]
+
+    def get_tier_info(self, user_tier: UserTier) -> dict:
+        """
+        Get information about a tier's AI capabilities.
+
+        Args:
+            user_tier: The user's subscription tier.
+
+        Returns:
+            Dictionary with tier information.
+        """
+        model_type = self.TIER_MODELS[user_tier]
+
+        # Map models to friendly names
+        model_names = {
+            ModelType.LLAMA_3_8B: "Llama 3 8B",
+            ModelType.CLAUDE_HAIKU: "Claude 3 Haiku",
+            ModelType.CLAUDE_SONNET: "Claude 3.5 Sonnet",
+            ModelType.CLAUDE_SONNET_4: "Claude Sonnet 4",
+        }
+
+        # Model quality descriptions
+        quality_descriptions = {
+            ModelType.LLAMA_3_8B: "Good quality, optimized for speed",
+            ModelType.CLAUDE_HAIKU: "High quality, fast responses",
+            ModelType.CLAUDE_SONNET: "Excellent quality, detailed narratives",
+            ModelType.CLAUDE_SONNET_4: "Best quality, most creative and nuanced",
+        }
+
+        return {
+            "tier": user_tier.value,
+            "model": model_type.value,
+            "model_name": model_names.get(model_type, model_type.value),
+            "base_tokens": self.BASE_TOKEN_LIMITS[user_tier],
+            "quality": quality_descriptions.get(model_type, "Standard quality"),
+        }
+
+    def estimate_cost_per_request(self, user_tier: UserTier) -> float:
+        """
+        Estimate the cost per AI request for a tier.
+
+        Args:
+            user_tier: The user's subscription tier.
+
+        Returns:
+            Estimated cost in USD per request.
+
+        Note:
+            These are rough estimates based on typical usage.
+            Actual costs depend on input/output tokens.
+        """
+        # Approximate cost per 1K tokens (input + output average)
+        COST_PER_1K_TOKENS = {
+            ModelType.LLAMA_3_8B: 0.0,       # Free tier
+            ModelType.CLAUDE_HAIKU: 0.001,   # $0.25/1M input, $1.25/1M output
+            ModelType.CLAUDE_SONNET: 0.006,  # $3/1M input, $15/1M output
+            ModelType.CLAUDE_SONNET_4: 0.015,  # Claude Sonnet 4 pricing
+        }
+
+        model_type = self.TIER_MODELS[user_tier]
+        base_tokens = self.BASE_TOKEN_LIMITS[user_tier]
+        cost_per_1k = COST_PER_1K_TOKENS.get(model_type, 0.0)
+
+        # Estimate: base tokens for output + ~50% for input tokens
+        estimated_tokens = base_tokens * 1.5
+
+        return (estimated_tokens / 1000) * cost_per_1k

api/app/ai/narrative_generator.py

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+"""
+Narrative generator wrapper for AI content generation.
+
+This module provides a high-level API for generating narrative content
+using the appropriate AI models based on user tier and context.
+"""
+
+from dataclasses import dataclass
+from typing import Any
+
+import structlog
+
+from app.ai.replicate_client import (
+    ReplicateClient,
+    ReplicateResponse,
+    ReplicateClientError,
+)
+from app.ai.model_selector import (
+    ModelSelector,
+    ModelConfig,
+    UserTier,
+    ContextType,
+)
+from app.ai.prompt_templates import (
+    PromptTemplates,
+    PromptTemplateError,
+    get_prompt_templates,
+)
+
+logger = structlog.get_logger(__name__)
+
+
+@dataclass
+class NarrativeResponse:
+    """Response from narrative generation."""
+    narrative: str
+    tokens_used: int
+    tokens_input: int
+    tokens_output: int
+    model: str
+    context_type: str
+    generation_time: float
+
+
+class NarrativeGeneratorError(Exception):
+    """Base exception for narrative generator errors."""
+    pass
+
+
+class NarrativeGenerator:
+    """
+    High-level wrapper for AI narrative generation.
+
+    This class coordinates between the model selector, prompt templates,
+    and AI clients to generate narrative content for the game.
+
+    It provides specialized methods for different narrative contexts:
+    - Story progression responses
+    - Combat narration
+    - Quest selection
+    - NPC dialogue
+    """
+
+    # System prompts for different contexts
+    SYSTEM_PROMPTS = {
+        ContextType.STORY_PROGRESSION: (
+            "You are an expert Dungeon Master running a solo D&D-style adventure. "
+            "Create immersive, engaging narratives that respond to player actions. "
+            "Be descriptive but concise. Always end with a clear opportunity for the player to act. "
+            "CRITICAL: NEVER give the player items, gold, equipment, or any rewards unless the action "
+            "instructions explicitly state they should receive them. Only narrate what the template "
+            "describes - do not improvise rewards or discoveries."
+        ),
+        ContextType.COMBAT_NARRATION: (
+            "You are a combat narrator for a fantasy RPG. "
+            "Describe actions with visceral, cinematic detail. "
+            "Keep narration punchy and exciting. Never include game mechanics in prose."
+        ),
+        ContextType.QUEST_SELECTION: (
+            "You are a quest selection system. "
+            "Analyze the context and select the most narratively appropriate quest. "
+            "Respond only with the quest_id - no explanation."
+        ),
+        ContextType.NPC_DIALOGUE: (
+            "You are a skilled voice actor portraying NPCs in a fantasy world. "
+            "Stay in character at all times. Give each NPC a distinct voice and personality. "
+            "Provide useful information while maintaining immersion."
+        ),
+    }
+
+    def __init__(
+        self,
+        model_selector: ModelSelector | None = None,
+        replicate_client: ReplicateClient | None = None,
+        prompt_templates: PromptTemplates | None = None
+    ):
+        """
+        Initialize the narrative generator.
+
+        Args:
+            model_selector: Optional custom model selector.
+            replicate_client: Optional custom Replicate client.
+            prompt_templates: Optional custom prompt templates.
+        """
+        self.model_selector = model_selector or ModelSelector()
+        self.replicate_client = replicate_client
+        self.prompt_templates = prompt_templates or get_prompt_templates()
+
+        logger.info("NarrativeGenerator initialized")
+
+    def _get_client(self, model_config: ModelConfig) -> ReplicateClient:
+        """
+        Get or create a Replicate client for the given model configuration.
+
+        Args:
+            model_config: The model configuration to use.
+
+        Returns:
+            ReplicateClient configured for the specified model.
+        """
+        # If a client was provided at init, use it
+        if self.replicate_client:
+            return self.replicate_client
+
+        # Otherwise create a new client with the specified model
+        return ReplicateClient(model=model_config.model_type)
+
+    def generate_story_response(
+        self,
+        character: dict[str, Any],
+        action: str,
+        game_state: dict[str, Any],
+        user_tier: UserTier,
+        conversation_history: list[dict[str, Any]] | None = None,
+        world_context: str | None = None,
+        action_instructions: str | None = None
+    ) -> NarrativeResponse:
+        """
+        Generate a DM response to a player's story action.
+
+        Args:
+            character: Character data dictionary with name, level, player_class, stats, etc.
+            action: The action the player wants to take.
+            game_state: Current game state with location, quests, etc.
+            user_tier: The user's subscription tier.
+            conversation_history: Optional list of recent conversation entries.
+            world_context: Optional additional world information.
+            action_instructions: Optional action-specific instructions for the AI from
+                the dm_prompt_template field in action_prompts.yaml.
+
+        Returns:
+            NarrativeResponse with the generated narrative and metadata.
+
+        Raises:
+            NarrativeGeneratorError: If generation fails.
+
+        Example:
+            >>> generator = NarrativeGenerator()
+            >>> response = generator.generate_story_response(
+            ...     character={"name": "Aldric", "level": 3, "player_class": "Fighter", ...},
+            ...     action="I search the room for hidden doors",
+            ...     game_state={"current_location": "Ancient Library", ...},
+            ...     user_tier=UserTier.PREMIUM
+            ... )
+            >>> print(response.narrative)
+        """
+        context_type = ContextType.STORY_PROGRESSION
+
+        logger.info(
+            "Generating story response",
+            character_name=character.get("name"),
+            action=action[:50],
+            user_tier=user_tier.value,
+            location=game_state.get("current_location")
+        )
+
+        # Get model configuration for this tier and context
+        model_config = self.model_selector.select_model(user_tier, context_type)
+
+        # Build the prompt from template
+        try:
+            prompt = self.prompt_templates.render(
+                "story_action.j2",
+                character=character,
+                action=action,
+                game_state=game_state,
+                conversation_history=conversation_history or [],
+                world_context=world_context,
+                max_tokens=model_config.max_tokens,
+                action_instructions=action_instructions
+            )
+        except PromptTemplateError as e:
+            logger.error("Failed to render story prompt", error=str(e))
+            raise NarrativeGeneratorError(f"Prompt template error: {e}")
+
+        # Debug: Log the full prompt being sent
+        logger.debug(
+            "Full prompt being sent to AI",
+            prompt_length=len(prompt),
+            conversation_history_count=len(conversation_history) if conversation_history else 0,
+            prompt_preview=prompt[:500] + "..." if len(prompt) > 500 else prompt
+        )
+        # For detailed debugging, uncomment the line below:
+        print(f"\n{'='*60}\nFULL PROMPT:\n{'='*60}\n{prompt}\n{'='*60}\n")
+
+        # Get system prompt
+        system_prompt = self.SYSTEM_PROMPTS[context_type]
+
+        # Generate response
+        try:
+            client = self._get_client(model_config)
+            response = client.generate(
+                prompt=prompt,
+                system_prompt=system_prompt,
+                max_tokens=model_config.max_tokens,
+                temperature=model_config.temperature,
+                model=model_config.model_type
+            )
+        except ReplicateClientError as e:
+            logger.error(
+                "AI generation failed",
+                error=str(e),
+                context_type=context_type.value
+            )
+            raise NarrativeGeneratorError(f"AI generation failed: {e}")
+
+        logger.info(
+            "Story response generated",
+            tokens_used=response.tokens_used,
+            model=response.model,
+            generation_time=f"{response.generation_time:.2f}s"
+        )
+
+        return NarrativeResponse(
+            narrative=response.text,
+            tokens_used=response.tokens_used,
+            tokens_input=response.tokens_input,
+            tokens_output=response.tokens_output,
+            model=response.model,
+            context_type=context_type.value,
+            generation_time=response.generation_time
+        )
+
+    def generate_combat_narration(
+        self,
+        character: dict[str, Any],
+        combat_state: dict[str, Any],
+        action: str,
+        action_result: dict[str, Any],
+        user_tier: UserTier,
+        is_critical: bool = False,
+        is_finishing_blow: bool = False
+    ) -> NarrativeResponse:
+        """
+        Generate narration for a combat action.
+
+        Args:
+            character: Character data dictionary.
+            combat_state: Current combat state with enemies, round number, etc.
+            action: Description of the combat action taken.
+            action_result: Result of the action (hit, damage, effects, etc.).
+            user_tier: The user's subscription tier.
+            is_critical: Whether this was a critical hit/miss.
+            is_finishing_blow: Whether this defeats the enemy.
+
+        Returns:
+            NarrativeResponse with combat narration.
+
+        Raises:
+            NarrativeGeneratorError: If generation fails.
+
+        Example:
+            >>> response = generator.generate_combat_narration(
+            ...     character={"name": "Aldric", ...},
+            ...     combat_state={"round_number": 3, "enemies": [...], ...},
+            ...     action="swings their sword at the goblin",
+            ...     action_result={"hit": True, "damage": 12, ...},
+            ...     user_tier=UserTier.BASIC
+            ... )
+        """
+        context_type = ContextType.COMBAT_NARRATION
+
+        logger.info(
+            "Generating combat narration",
+            character_name=character.get("name"),
+            action=action[:50],
+            is_critical=is_critical,
+            is_finishing_blow=is_finishing_blow
+        )
+
+        # Get model configuration
+        model_config = self.model_selector.select_model(user_tier, context_type)
+
+        # Build the prompt
+        try:
+            prompt = self.prompt_templates.render(
+                "combat_action.j2",
+                character=character,
+                combat_state=combat_state,
+                action=action,
+                action_result=action_result,
+                is_critical=is_critical,
+                is_finishing_blow=is_finishing_blow,
+                max_tokens=model_config.max_tokens
+            )
+        except PromptTemplateError as e:
+            logger.error("Failed to render combat prompt", error=str(e))
+            raise NarrativeGeneratorError(f"Prompt template error: {e}")
+
+        # Generate response
+        system_prompt = self.SYSTEM_PROMPTS[context_type]
+
+        try:
+            client = self._get_client(model_config)
+            response = client.generate(
+                prompt=prompt,
+                system_prompt=system_prompt,
+                max_tokens=model_config.max_tokens,
+                temperature=model_config.temperature,
+                model=model_config.model_type
+            )
+        except ReplicateClientError as e:
+            logger.error("Combat narration generation failed", error=str(e))
+            raise NarrativeGeneratorError(f"AI generation failed: {e}")
+
+        logger.info(
+            "Combat narration generated",
+            tokens_used=response.tokens_used,
+            generation_time=f"{response.generation_time:.2f}s"
+        )
+
+        return NarrativeResponse(
+            narrative=response.text,
+            tokens_used=response.tokens_used,
+            tokens_input=response.tokens_input,
+            tokens_output=response.tokens_output,
+            model=response.model,
+            context_type=context_type.value,
+            generation_time=response.generation_time
+        )
+
+    def generate_quest_selection(
+        self,
+        character: dict[str, Any],
+        eligible_quests: list[dict[str, Any]],
+        game_context: dict[str, Any],
+        user_tier: UserTier,
+        recent_actions: list[str] | None = None
+    ) -> str:
+        """
+        Use AI to select the most contextually appropriate quest.
+
+        Args:
+            character: Character data dictionary.
+            eligible_quests: List of quest data dictionaries that can be offered.
+            game_context: Current game context (location, events, etc.).
+            user_tier: The user's subscription tier.
+            recent_actions: Optional list of recent player actions.
+
+        Returns:
+            The quest_id of the selected quest.
+
+        Raises:
+            NarrativeGeneratorError: If generation fails or response is invalid.
+
+        Example:
+            >>> quest_id = generator.generate_quest_selection(
+            ...     character={"name": "Aldric", "level": 3, ...},
+            ...     eligible_quests=[{"quest_id": "goblin_cave", ...}, ...],
+            ...     game_context={"current_location": "Tavern", ...},
+            ...     user_tier=UserTier.FREE
+            ... )
+            >>> print(quest_id)  # "goblin_cave"
+        """
+        context_type = ContextType.QUEST_SELECTION
+
+        logger.info(
+            "Generating quest selection",
+            character_name=character.get("name"),
+            num_eligible_quests=len(eligible_quests),
+            location=game_context.get("current_location")
+        )
+
+        if not eligible_quests:
+            raise NarrativeGeneratorError("No eligible quests provided")
+
+        # Get model configuration
+        model_config = self.model_selector.select_model(user_tier, context_type)
+
+        # Build the prompt
+        try:
+            prompt = self.prompt_templates.render(
+                "quest_offering.j2",
+                character=character,
+                eligible_quests=eligible_quests,
+                game_context=game_context,
+                recent_actions=recent_actions or []
+            )
+        except PromptTemplateError as e:
+            logger.error("Failed to render quest selection prompt", error=str(e))
+            raise NarrativeGeneratorError(f"Prompt template error: {e}")
+
+        # Generate response
+        system_prompt = self.SYSTEM_PROMPTS[context_type]
+
+        try:
+            client = self._get_client(model_config)
+            response = client.generate(
+                prompt=prompt,
+                system_prompt=system_prompt,
+                max_tokens=model_config.max_tokens,
+                temperature=model_config.temperature,
+                model=model_config.model_type
+            )
+        except ReplicateClientError as e:
+            logger.error("Quest selection generation failed", error=str(e))
+            raise NarrativeGeneratorError(f"AI generation failed: {e}")
+
+        # Parse the response to get quest_id
+        quest_id = response.text.strip().lower()
+
+        # Validate the response is a valid quest_id
+        valid_quest_ids = {q.get("quest_id", "").lower() for q in eligible_quests}
+        if quest_id not in valid_quest_ids:
+            logger.warning(
+                "AI returned invalid quest_id, using first eligible quest",
+                returned_id=quest_id,
+                valid_ids=list(valid_quest_ids)
+            )
+            quest_id = eligible_quests[0].get("quest_id", "")
+
+        logger.info(
+            "Quest selected",
+            quest_id=quest_id,
+            tokens_used=response.tokens_used,
+            generation_time=f"{response.generation_time:.2f}s"
+        )
+
+        return quest_id
+
+    def generate_npc_dialogue(
+        self,
+        character: dict[str, Any],
+        npc: dict[str, Any],
+        conversation_topic: str,
+        game_state: dict[str, Any],
+        user_tier: UserTier,
+        npc_relationship: str | None = None,
+        previous_dialogue: list[dict[str, Any]] | None = None,
+        npc_knowledge: list[str] | None = None
+    ) -> NarrativeResponse:
+        """
+        Generate NPC dialogue in response to player conversation.
+
+        Args:
+            character: Character data dictionary.
+            npc: NPC data with name, role, personality, etc.
+            conversation_topic: What the player said or wants to discuss.
+            game_state: Current game state.
+            user_tier: The user's subscription tier.
+            npc_relationship: Optional description of relationship with NPC.
+            previous_dialogue: Optional list of previous exchanges.
+            npc_knowledge: Optional list of things this NPC knows about.
+
+        Returns:
+            NarrativeResponse with NPC dialogue.
+
+        Raises:
+            NarrativeGeneratorError: If generation fails.
+
+        Example:
+            >>> response = generator.generate_npc_dialogue(
+            ...     character={"name": "Aldric", ...},
+            ...     npc={"name": "Old Barkeep", "role": "Tavern Owner", ...},
+            ...     conversation_topic="What rumors have you heard lately?",
+            ...     game_state={"current_location": "The Rusty Anchor", ...},
+            ...     user_tier=UserTier.PREMIUM
+            ... )
+        """
+        context_type = ContextType.NPC_DIALOGUE
+
+        logger.info(
+            "Generating NPC dialogue",
+            character_name=character.get("name"),
+            npc_name=npc.get("name"),
+            topic=conversation_topic[:50]
+        )
+
+        # Get model configuration
+        model_config = self.model_selector.select_model(user_tier, context_type)
+
+        # Build the prompt
+        try:
+            prompt = self.prompt_templates.render(
+                "npc_dialogue.j2",
+                character=character,
+                npc=npc,
+                conversation_topic=conversation_topic,
+                game_state=game_state,
+                npc_relationship=npc_relationship,
+                previous_dialogue=previous_dialogue or [],
+                npc_knowledge=npc_knowledge or [],
+                max_tokens=model_config.max_tokens
+            )
+        except PromptTemplateError as e:
+            logger.error("Failed to render NPC dialogue prompt", error=str(e))
+            raise NarrativeGeneratorError(f"Prompt template error: {e}")
+
+        # Generate response
+        system_prompt = self.SYSTEM_PROMPTS[context_type]
+
+        try:
+            client = self._get_client(model_config)
+            response = client.generate(
+                prompt=prompt,
+                system_prompt=system_prompt,
+                max_tokens=model_config.max_tokens,
+                temperature=model_config.temperature,
+                model=model_config.model_type
+            )
+        except ReplicateClientError as e:
+            logger.error("NPC dialogue generation failed", error=str(e))
+            raise NarrativeGeneratorError(f"AI generation failed: {e}")
+
+        logger.info(
+            "NPC dialogue generated",
+            npc_name=npc.get("name"),
+            tokens_used=response.tokens_used,
+            generation_time=f"{response.generation_time:.2f}s"
+        )
+
+        return NarrativeResponse(
+            narrative=response.text,
+            tokens_used=response.tokens_used,
+            tokens_input=response.tokens_input,
+            tokens_output=response.tokens_output,
+            model=response.model,
+            context_type=context_type.value,
+            generation_time=response.generation_time
+        )

api/app/ai/prompt_templates.py

@@ -0,0 +1,318 @@
+"""
+Jinja2 prompt template system for AI generation.
+
+This module provides a templating system for building AI prompts
+with consistent structure and context injection.
+"""
+
+import os
+from pathlib import Path
+from typing import Any
+
+import structlog
+from jinja2 import Environment, FileSystemLoader, select_autoescape
+
+logger = structlog.get_logger(__name__)
+
+
+class PromptTemplateError(Exception):
+    """Error in prompt template processing."""
+    pass
+
+
+class PromptTemplates:
+    """
+    Manages Jinja2 templates for AI prompt generation.
+
+    Provides caching, helper functions, and consistent template rendering
+    for all AI prompt types.
+    """
+
+    # Template directory relative to this module
+    TEMPLATE_DIR = Path(__file__).parent / "templates"
+
+    def __init__(self, template_dir: Path | str | None = None):
+        """
+        Initialize the prompt template system.
+
+        Args:
+            template_dir: Optional custom template directory path.
+        """
+        self.template_dir = Path(template_dir) if template_dir else self.TEMPLATE_DIR
+
+        # Ensure template directory exists
+        if not self.template_dir.exists():
+            self.template_dir.mkdir(parents=True, exist_ok=True)
+            logger.warning(
+                "Template directory created",
+                path=str(self.template_dir)
+            )
+
+        # Set up Jinja2 environment with caching
+        self.env = Environment(
+            loader=FileSystemLoader(str(self.template_dir)),
+            autoescape=select_autoescape(['html', 'xml']),
+            trim_blocks=True,
+            lstrip_blocks=True,
+        )
+
+        # Register custom filters
+        self._register_filters()
+
+        # Register custom globals
+        self._register_globals()
+
+        logger.info(
+            "PromptTemplates initialized",
+            template_dir=str(self.template_dir)
+        )
+
+    def _register_filters(self):
+        """Register custom Jinja2 filters."""
+        self.env.filters['format_inventory'] = self._format_inventory
+        self.env.filters['format_stats'] = self._format_stats
+        self.env.filters['format_skills'] = self._format_skills
+        self.env.filters['format_effects'] = self._format_effects
+        self.env.filters['truncate_text'] = self._truncate_text
+        self.env.filters['format_gold'] = self._format_gold
+
+    def _register_globals(self):
+        """Register global functions available in templates."""
+        self.env.globals['len'] = len
+        self.env.globals['min'] = min
+        self.env.globals['max'] = max
+        self.env.globals['enumerate'] = enumerate
+
+    # Custom filters
+    @staticmethod
+    def _format_inventory(items: list[dict], max_items: int = 10) -> str:
+        """
+        Format inventory items for prompt context.
+
+        Args:
+            items: List of item dictionaries with 'name' and 'quantity'.
+            max_items: Maximum number of items to display.
+
+        Returns:
+            Formatted inventory string.
+        """
+        if not items:
+            return "Empty inventory"
+
+        formatted = []
+        for item in items[:max_items]:
+            name = item.get('name', 'Unknown')
+            qty = item.get('quantity', 1)
+            if qty > 1:
+                formatted.append(f"{name} (x{qty})")
+            else:
+                formatted.append(name)
+
+        result = ", ".join(formatted)
+        if len(items) > max_items:
+            result += f", and {len(items) - max_items} more items"
+
+        return result
+
+    @staticmethod
+    def _format_stats(stats: dict) -> str:
+        """
+        Format character stats for prompt context.
+
+        Args:
+            stats: Dictionary of stat names to values.
+
+        Returns:
+            Formatted stats string.
+        """
+        if not stats:
+            return "No stats available"
+
+        formatted = []
+        for stat, value in stats.items():
+            # Convert snake_case to Title Case
+            display_name = stat.replace('_', ' ').title()
+            formatted.append(f"{display_name}: {value}")
+
+        return ", ".join(formatted)
+
+    @staticmethod
+    def _format_skills(skills: list[dict], max_skills: int = 5) -> str:
+        """
+        Format character skills for prompt context.
+
+        Args:
+            skills: List of skill dictionaries with 'name' and 'level'.
+            max_skills: Maximum number of skills to display.
+
+        Returns:
+            Formatted skills string.
+        """
+        if not skills:
+            return "No skills"
+
+        formatted = []
+        for skill in skills[:max_skills]:
+            name = skill.get('name', 'Unknown')
+            level = skill.get('level', 1)
+            formatted.append(f"{name} (Lv.{level})")
+
+        result = ", ".join(formatted)
+        if len(skills) > max_skills:
+            result += f", and {len(skills) - max_skills} more skills"
+
+        return result
+
+    @staticmethod
+    def _format_effects(effects: list[dict]) -> str:
+        """
+        Format active effects/buffs/debuffs for prompt context.
+
+        Args:
+            effects: List of effect dictionaries.
+
+        Returns:
+            Formatted effects string.
+        """
+        if not effects:
+            return "No active effects"
+
+        formatted = []
+        for effect in effects:
+            name = effect.get('name', 'Unknown')
+            duration = effect.get('remaining_turns')
+            if duration:
+                formatted.append(f"{name} ({duration} turns)")
+            else:
+                formatted.append(name)
+
+        return ", ".join(formatted)
+
+    @staticmethod
+    def _truncate_text(text: str, max_length: int = 100) -> str:
+        """
+        Truncate text to maximum length with ellipsis.
+
+        Args:
+            text: Text to truncate.
+            max_length: Maximum character length.
+
+        Returns:
+            Truncated text with ellipsis if needed.
+        """
+        if len(text) <= max_length:
+            return text
+        return text[:max_length - 3] + "..."
+
+    @staticmethod
+    def _format_gold(amount: int) -> str:
+        """
+        Format gold amount with commas.
+
+        Args:
+            amount: Gold amount.
+
+        Returns:
+            Formatted gold string.
+        """
+        return f"{amount:,} gold"
+
+    def render(self, template_name: str, **context: Any) -> str:
+        """
+        Render a template with the given context.
+
+        Args:
+            template_name: Name of the template file (e.g., 'story_action.j2').
+            **context: Variables to pass to the template.
+
+        Returns:
+            Rendered template string.
+
+        Raises:
+            PromptTemplateError: If template not found or rendering fails.
+        """
+        try:
+            template = self.env.get_template(template_name)
+            rendered = template.render(**context)
+
+            logger.debug(
+                "Template rendered",
+                template=template_name,
+                context_keys=list(context.keys()),
+                output_length=len(rendered)
+            )
+
+            return rendered.strip()
+
+        except Exception as e:
+            logger.error(
+                "Template rendering failed",
+                template=template_name,
+                error=str(e)
+            )
+            raise PromptTemplateError(f"Failed to render {template_name}: {e}")
+
+    def render_string(self, template_string: str, **context: Any) -> str:
+        """
+        Render a template string directly.
+
+        Args:
+            template_string: Jinja2 template string.
+            **context: Variables to pass to the template.
+
+        Returns:
+            Rendered string.
+
+        Raises:
+            PromptTemplateError: If rendering fails.
+        """
+        try:
+            template = self.env.from_string(template_string)
+            rendered = template.render(**context)
+            return rendered.strip()
+        except Exception as e:
+            logger.error(
+                "String template rendering failed",
+                error=str(e)
+            )
+            raise PromptTemplateError(f"Failed to render template string: {e}")
+
+    def get_template_names(self) -> list[str]:
+        """
+        Get list of available template names.
+
+        Returns:
+            List of template file names.
+        """
+        return self.env.list_templates(extensions=['j2'])
+
+
+# Global instance for convenience
+_templates: PromptTemplates | None = None
+
+
+def get_prompt_templates() -> PromptTemplates:
+    """
+    Get the global PromptTemplates instance.
+
+    Returns:
+        Singleton PromptTemplates instance.
+    """
+    global _templates
+    if _templates is None:
+        _templates = PromptTemplates()
+    return _templates
+
+
+def render_prompt(template_name: str, **context: Any) -> str:
+    """
+    Convenience function to render a prompt template.
+
+    Args:
+        template_name: Name of the template file.
+        **context: Variables to pass to the template.
+
+    Returns:
+        Rendered template string.
+    """
+    return get_prompt_templates().render(template_name, **context)

api/app/ai/replicate_client.py

@@ -0,0 +1,450 @@
+"""
+Replicate API client for AI model integration.
+
+This module provides a client for interacting with the Replicate API
+to generate text using various models including Llama-3 and Claude models.
+All AI generation goes through Replicate for unified billing and management.
+"""
+
+import time
+from dataclasses import dataclass
+from enum import Enum
+from typing import Any
+
+import replicate
+import structlog
+
+from app.config import get_config
+
+logger = structlog.get_logger(__name__)
+
+
+class ModelType(str, Enum):
+    """Supported model types on Replicate."""
+    # Free tier - Llama models
+    LLAMA_3_8B = "meta/meta-llama-3-8b-instruct"
+
+    # Paid tiers - Claude models via Replicate
+    CLAUDE_HAIKU = "anthropic/claude-3.5-haiku"
+    CLAUDE_SONNET = "anthropic/claude-3.5-sonnet"
+    CLAUDE_SONNET_4 = "anthropic/claude-4.5-sonnet"
+
+
+@dataclass
+class ReplicateResponse:
+    """Response from Replicate API generation."""
+    text: str
+    tokens_used: int  # Deprecated: use tokens_output instead
+    tokens_input: int
+    tokens_output: int
+    model: str
+    generation_time: float
+
+
+class ReplicateClientError(Exception):
+    """Base exception for Replicate client errors."""
+    pass
+
+
+class ReplicateAPIError(ReplicateClientError):
+    """Error from Replicate API."""
+    pass
+
+
+class ReplicateRateLimitError(ReplicateClientError):
+    """Rate limit exceeded on Replicate API."""
+    pass
+
+
+class ReplicateTimeoutError(ReplicateClientError):
+    """Timeout waiting for Replicate response."""
+    pass
+
+
+class ReplicateClient:
+    """
+    Client for interacting with Replicate API.
+
+    Supports multiple models including Llama-3 and Claude models.
+    Implements retry logic with exponential backoff for rate limits.
+    """
+
+    # Default model for free tier
+    DEFAULT_MODEL = ModelType.LLAMA_3_8B
+
+    # Retry configuration
+    MAX_RETRIES = 3
+    INITIAL_RETRY_DELAY = 1.0  # seconds
+
+    # Default generation parameters
+    DEFAULT_MAX_TOKENS = 256
+    DEFAULT_TEMPERATURE = 0.7
+    DEFAULT_TOP_P = 0.9
+    DEFAULT_TIMEOUT = 30  # seconds
+
+    # Model-specific defaults
+    MODEL_DEFAULTS = {
+        ModelType.LLAMA_3_8B: {
+            "max_tokens": 256,
+            "temperature": 0.7,
+        },
+        ModelType.CLAUDE_HAIKU: {
+            "max_tokens": 512,
+            "temperature": 0.8,
+        },
+        ModelType.CLAUDE_SONNET: {
+            "max_tokens": 1024,
+            "temperature": 0.9,
+        },
+        ModelType.CLAUDE_SONNET_4: {
+            "max_tokens": 2048,
+            "temperature": 0.9,
+        },
+    }
+
+    def __init__(self, api_token: str | None = None, model: str | ModelType | None = None):
+        """
+        Initialize the Replicate client.
+
+        Args:
+            api_token: Replicate API token. If not provided, reads from config.
+            model: Model identifier or ModelType enum. Defaults to Llama-3 8B Instruct.
+
+        Raises:
+            ReplicateClientError: If API token is not configured.
+        """
+        config = get_config()
+
+        # Get API token from parameter or config
+        self.api_token = api_token or getattr(config, 'replicate_api_token', None)
+        if not self.api_token:
+            raise ReplicateClientError(
+                "Replicate API token not configured. "
+                "Set REPLICATE_API_TOKEN in environment or config."
+            )
+
+        # Get model from parameter, config, or default
+        if model is None:
+            model = getattr(config, 'REPLICATE_MODEL', None) or self.DEFAULT_MODEL
+
+        # Convert string to ModelType if needed, or keep as string for custom models
+        if isinstance(model, ModelType):
+            self.model = model.value
+            self.model_type = model
+        elif isinstance(model, str):
+            # Try to match to ModelType
+            self.model = model
+            self.model_type = self._get_model_type(model)
+        else:
+            self.model = self.DEFAULT_MODEL.value
+            self.model_type = self.DEFAULT_MODEL
+
+        # Set the API token for the replicate library
+        import os
+        os.environ['REPLICATE_API_TOKEN'] = self.api_token
+
+        logger.info(
+            "Replicate client initialized",
+            model=self.model,
+            model_type=self.model_type.name if self.model_type else "custom"
+        )
+
+    def _get_model_type(self, model_string: str) -> ModelType | None:
+        """Get ModelType enum from model string."""
+        for model_type in ModelType:
+            if model_type.value == model_string:
+                return model_type
+        return None
+
+    def _is_claude_model(self) -> bool:
+        """Check if current model is a Claude model."""
+        return self.model_type in [
+            ModelType.CLAUDE_HAIKU,
+            ModelType.CLAUDE_SONNET,
+            ModelType.CLAUDE_SONNET_4
+        ]
+
+    def generate(
+        self,
+        prompt: str,
+        system_prompt: str | None = None,
+        max_tokens: int | None = None,
+        temperature: float | None = None,
+        top_p: float | None = None,
+        timeout: int | None = None,
+        model: str | ModelType | None = None
+    ) -> ReplicateResponse:
+        """
+        Generate text using the configured model.
+
+        Args:
+            prompt: The user prompt to send to the model.
+            system_prompt: Optional system prompt for context setting.
+            max_tokens: Maximum tokens to generate. Uses model defaults if not specified.
+            temperature: Sampling temperature (0.0-1.0). Uses model defaults if not specified.
+            top_p: Top-p sampling parameter. Defaults to 0.9.
+            timeout: Timeout in seconds. Defaults to 30.
+            model: Override the default model for this request.
+
+        Returns:
+            ReplicateResponse with generated text and metadata.
+
+        Raises:
+            ReplicateAPIError: For API errors.
+            ReplicateRateLimitError: When rate limited.
+            ReplicateTimeoutError: When request times out.
+        """
+        # Handle model override
+        if model:
+            if isinstance(model, ModelType):
+                current_model = model.value
+                current_model_type = model
+            else:
+                current_model = model
+                current_model_type = self._get_model_type(model)
+        else:
+            current_model = self.model
+            current_model_type = self.model_type
+
+        # Get model-specific defaults
+        model_defaults = self.MODEL_DEFAULTS.get(current_model_type, {})
+
+        # Apply defaults (parameter > model default > class default)
+        max_tokens = max_tokens or model_defaults.get("max_tokens", self.DEFAULT_MAX_TOKENS)
+        temperature = temperature or model_defaults.get("temperature", self.DEFAULT_TEMPERATURE)
+        top_p = top_p or self.DEFAULT_TOP_P
+        timeout = timeout or self.DEFAULT_TIMEOUT
+
+        # Format prompt based on model type
+        is_claude = current_model_type in [
+            ModelType.CLAUDE_HAIKU,
+            ModelType.CLAUDE_SONNET,
+            ModelType.CLAUDE_SONNET_4
+        ]
+
+        if is_claude:
+            input_params = self._build_claude_params(
+                prompt, system_prompt, max_tokens, temperature, top_p
+            )
+        else:
+            # Llama-style formatting
+            formatted_prompt = self._format_llama_prompt(prompt, system_prompt)
+            input_params = {
+                "prompt": formatted_prompt,
+                "max_tokens": max_tokens,
+                "temperature": temperature,
+                "top_p": top_p,
+            }
+
+        logger.debug(
+            "Generating text with Replicate",
+            model=current_model,
+            max_tokens=max_tokens,
+            temperature=temperature,
+            is_claude=is_claude
+        )
+
+        # Execute with retry logic
+        start_time = time.time()
+        output = self._execute_with_retry(current_model, input_params, timeout)
+        generation_time = time.time() - start_time
+
+        # Parse response
+        text = self._parse_response(output)
+
+        # Estimate tokens (rough approximation: ~4 chars per token)
+        # Calculate input tokens from the actual prompt sent
+        prompt_text = input_params.get("prompt", "")
+        system_text = input_params.get("system_prompt", "")
+        total_input_text = prompt_text + system_text
+        tokens_input = len(total_input_text) // 4
+
+        # Calculate output tokens from response
+        tokens_output = len(text) // 4
+
+        # Total for backwards compatibility
+        tokens_used = tokens_input + tokens_output
+
+        logger.info(
+            "Replicate generation complete",
+            model=current_model,
+            tokens_input=tokens_input,
+            tokens_output=tokens_output,
+            tokens_used=tokens_used,
+            generation_time=f"{generation_time:.2f}s",
+            response_length=len(text)
+        )
+
+        return ReplicateResponse(
+            text=text.strip(),
+            tokens_used=tokens_used,
+            tokens_input=tokens_input,
+            tokens_output=tokens_output,
+            model=current_model,
+            generation_time=generation_time
+        )
+
+    def _build_claude_params(
+        self,
+        prompt: str,
+        system_prompt: str | None,
+        max_tokens: int,
+        temperature: float,
+        top_p: float
+    ) -> dict[str, Any]:
+        """
+        Build input parameters for Claude models on Replicate.
+
+        Args:
+            prompt: User prompt.
+            system_prompt: Optional system prompt.
+            max_tokens: Maximum tokens to generate.
+            temperature: Sampling temperature.
+            top_p: Top-p sampling parameter.
+
+        Returns:
+            Dictionary of input parameters for Replicate API.
+        """
+        params = {
+            "prompt": prompt,
+            "max_tokens": max_tokens,
+            "temperature": temperature,
+            "top_p": top_p,
+        }
+
+        if system_prompt:
+            params["system_prompt"] = system_prompt
+
+        return params
+
+    def _format_llama_prompt(self, prompt: str, system_prompt: str | None = None) -> str:
+        """
+        Format prompt for Llama-3 Instruct model.
+
+        Llama-3 Instruct uses a specific format with special tokens.
+
+        Args:
+            prompt: User prompt.
+            system_prompt: Optional system prompt.
+
+        Returns:
+            Formatted prompt string.
+        """
+        parts = []
+
+        if system_prompt:
+            parts.append(f"<|begin_of_text|><|start_header_id|>system<|end_header_id|>\n\n{system_prompt}<|eot_id|>")
+        else:
+            parts.append("<|begin_of_text|>")
+
+        parts.append(f"<|start_header_id|>user<|end_header_id|>\n\n{prompt}<|eot_id|>")
+        parts.append("<|start_header_id|>assistant<|end_header_id|>\n\n")
+
+        return "".join(parts)
+
+    def _parse_response(self, output: Any) -> str:
+        """
+        Parse response from Replicate API.
+
+        Handles both streaming iterators and direct string responses.
+
+        Args:
+            output: Raw output from Replicate API.
+
+        Returns:
+            Parsed text string.
+        """
+        if hasattr(output, '__iter__') and not isinstance(output, str):
+            return "".join(output)
+        return str(output)
+
+    def _execute_with_retry(
+        self,
+        model: str,
+        input_params: dict[str, Any],
+        timeout: int
+    ) -> Any:
+        """
+        Execute Replicate API call with retry logic.
+
+        Implements exponential backoff for rate limit errors.
+
+        Args:
+            model: Model identifier to run.
+            input_params: Input parameters for the model.
+            timeout: Timeout in seconds.
+
+        Returns:
+            API response output.
+
+        Raises:
+            ReplicateAPIError: For API errors after retries.
+            ReplicateRateLimitError: When rate limit persists after retries.
+            ReplicateTimeoutError: When request times out.
+        """
+        last_error = None
+        retry_delay = self.INITIAL_RETRY_DELAY
+
+        for attempt in range(self.MAX_RETRIES):
+            try:
+                output = replicate.run(
+                    model,
+                    input=input_params
+                )
+                return output
+
+            except replicate.exceptions.ReplicateError as e:
+                error_message = str(e).lower()
+
+                if "rate limit" in error_message or "429" in error_message:
+                    last_error = ReplicateRateLimitError(f"Rate limited: {e}")
+
+                    if attempt < self.MAX_RETRIES - 1:
+                        logger.warning(
+                            "Rate limited, retrying",
+                            attempt=attempt + 1,
+                            retry_delay=retry_delay
+                        )
+                        time.sleep(retry_delay)
+                        retry_delay *= 2
+                        continue
+                    else:
+                        raise last_error
+
+                elif "timeout" in error_message:
+                    raise ReplicateTimeoutError(f"Request timed out: {e}")
+
+                else:
+                    raise ReplicateAPIError(f"API error: {e}")
+
+            except Exception as e:
+                error_message = str(e).lower()
+
+                if "timeout" in error_message:
+                    raise ReplicateTimeoutError(f"Request timed out: {e}")
+
+                raise ReplicateAPIError(f"Unexpected error: {e}")
+
+        if last_error:
+            raise last_error
+        raise ReplicateAPIError("Max retries exceeded")
+
+    def validate_api_key(self) -> bool:
+        """
+        Validate that the API key is valid.
+
+        Makes a minimal API call to check credentials.
+
+        Returns:
+            True if API key is valid, False otherwise.
+        """
+        try:
+            model_name = self.model.split(':')[0]
+            model = replicate.models.get(model_name)
+            return model is not None
+        except Exception as e:
+            logger.warning(
+                "API key validation failed",
+                error=str(e)
+            )
+            return False

api/app/ai/response_parser.py

@@ -0,0 +1,160 @@
+"""
+Response parser for AI narrative responses.
+
+This module handles AI response parsing. Game state changes (items, gold, XP)
+are now handled exclusively through predetermined dice check outcomes in
+action templates, not through AI-generated JSON.
+"""
+
+from dataclasses import dataclass, field
+from typing import Any, Optional
+
+import structlog
+
+logger = structlog.get_logger(__name__)
+
+
+@dataclass
+class ItemGrant:
+    """
+    Represents an item granted by the AI during gameplay.
+
+    The AI can grant items in two ways:
+    1. By item_id - References an existing item from game data
+    2. By name/type/description - Creates a generic item
+    """
+    item_id: Optional[str] = None  # For existing items
+    name: Optional[str] = None  # For generic items
+    item_type: Optional[str] = None  # consumable, weapon, armor, quest_item
+    description: Optional[str] = None
+    value: int = 0
+    quantity: int = 1
+
+    def is_existing_item(self) -> bool:
+        """Check if this references an existing item by ID."""
+        return self.item_id is not None
+
+    def is_generic_item(self) -> bool:
+        """Check if this is a generic item created by the AI."""
+        return self.item_id is None and self.name is not None
+
+
+@dataclass
+class GameStateChanges:
+    """
+    Structured game state changes extracted from AI response.
+
+    These changes are validated and applied to the character after
+    the AI generates its narrative response.
+    """
+    items_given: list[ItemGrant] = field(default_factory=list)
+    items_taken: list[str] = field(default_factory=list)  # item_ids to remove
+    gold_given: int = 0
+    gold_taken: int = 0
+    experience_given: int = 0
+    quest_offered: Optional[str] = None  # quest_id
+    quest_completed: Optional[str] = None  # quest_id
+    location_change: Optional[str] = None
+
+
+@dataclass
+class ParsedAIResponse:
+    """
+    Complete parsed AI response with narrative and game state changes.
+
+    Attributes:
+        narrative: The narrative text to display to the player
+        game_changes: Structured game state changes to apply
+        raw_response: The original unparsed response from AI
+        parse_success: Whether parsing succeeded
+        parse_errors: Any errors encountered during parsing
+    """
+    narrative: str
+    game_changes: GameStateChanges
+    raw_response: str
+    parse_success: bool = True
+    parse_errors: list[str] = field(default_factory=list)
+
+
+class ResponseParserError(Exception):
+    """Exception raised when response parsing fails critically."""
+    pass
+
+
+def parse_ai_response(response_text: str) -> ParsedAIResponse:
+    """
+    Parse an AI response to extract the narrative text.
+
+    Game state changes (items, gold, XP) are now handled exclusively through
+    predetermined dice check outcomes, not through AI-generated structured data.
+
+    Args:
+        response_text: The raw AI response text
+
+    Returns:
+        ParsedAIResponse with narrative (game_changes will be empty)
+    """
+    logger.debug("Parsing AI response", response_length=len(response_text))
+
+    # Return the full response as narrative
+    # Game state changes come from predetermined check_outcomes, not AI
+    return ParsedAIResponse(
+        narrative=response_text.strip(),
+        game_changes=GameStateChanges(),
+        raw_response=response_text,
+        parse_success=True,
+        parse_errors=[]
+    )
+
+
+def _parse_game_actions(data: dict[str, Any]) -> GameStateChanges:
+    """
+    Parse the game actions dictionary into a GameStateChanges object.
+
+    Args:
+        data: Dictionary from parsed JSON
+
+    Returns:
+        GameStateChanges object with parsed data
+    """
+    changes = GameStateChanges()
+
+    # Parse items_given
+    if "items_given" in data and data["items_given"]:
+        for item_data in data["items_given"]:
+            if isinstance(item_data, dict):
+                item_grant = ItemGrant(
+                    item_id=item_data.get("item_id"),
+                    name=item_data.get("name"),
+                    item_type=item_data.get("type"),
+                    description=item_data.get("description"),
+                    value=item_data.get("value", 0),
+                    quantity=item_data.get("quantity", 1)
+                )
+                changes.items_given.append(item_grant)
+            elif isinstance(item_data, str):
+                # Simple string format - treat as item_id
+                changes.items_given.append(ItemGrant(item_id=item_data))
+
+    # Parse items_taken
+    if "items_taken" in data and data["items_taken"]:
+        changes.items_taken = [
+            item_id for item_id in data["items_taken"]
+            if isinstance(item_id, str)
+        ]
+
+    # Parse gold changes
+    changes.gold_given = int(data.get("gold_given", 0))
+    changes.gold_taken = int(data.get("gold_taken", 0))
+
+    # Parse experience
+    changes.experience_given = int(data.get("experience_given", 0))
+
+    # Parse quest changes
+    changes.quest_offered = data.get("quest_offered")
+    changes.quest_completed = data.get("quest_completed")
+
+    # Parse location change
+    changes.location_change = data.get("location_change")
+
+    return changes

api/app/ai/templates/combat_action.j2

@@ -0,0 +1,81 @@
+{#
+Combat Action Prompt Template
+Used for narrating combat actions and outcomes.
+
+Required context:
+- character: Character object
+- combat_state: Current combat information
+- action: The combat action being taken
+- action_result: Outcome of the action (damage, effects, etc.)
+
+Optional context:
+- is_critical: Whether this was a critical hit/miss
+- is_finishing_blow: Whether this defeats the enemy
+#}
+You are the Dungeon Master narrating an exciting combat encounter.
+
+## Combatants
+**{{ character.name }}** (Level {{ character.level }} {{ character.player_class }})
+- Health: {{ character.current_hp }}/{{ character.max_hp }} HP
+{% if character.effects %}
+- Active Effects: {{ character.effects | format_effects }}
+{% endif %}
+
+**vs**
+
+{% for enemy in combat_state.enemies %}
+**{{ enemy.name }}**
+- Health: {{ enemy.current_hp }}/{{ enemy.max_hp }} HP
+{% if enemy.effects %}
+- Status: {{ enemy.effects | format_effects }}
+{% endif %}
+{% endfor %}
+
+## Combat Round {{ combat_state.round_number }}
+Turn: {{ combat_state.current_turn }}
+
+## Action Taken
+{{ character.name }} {{ action }}
+
+## Action Result
+{% if action_result.hit %}
+- **Hit!** {{ action_result.damage }} damage dealt
+{% if is_critical %}
+- **CRITICAL HIT!**
+{% endif %}
+{% if action_result.effects_applied %}
+- Applied: {{ action_result.effects_applied | join(', ') }}
+{% endif %}
+{% else %}
+- **Miss!** The attack fails to connect
+{% endif %}
+
+{% if is_finishing_blow %}
+**{{ action_result.target }} has been defeated!**
+{% endif %}
+
+## Your Task
+Narrate this combat action:
+1. Describe the action with visceral, cinematic detail
+2. Show the result - the impact, the enemy's reaction
+{% if is_finishing_blow %}
+3. Describe the enemy's defeat dramatically
+{% else %}
+3. Hint at the enemy's remaining threat or weakness
+{% endif %}
+
+{% if max_tokens %}
+**IMPORTANT: Your response must be under {{ (max_tokens * 0.6) | int }} words (approximately {{ max_tokens }} tokens). Complete all sentences - do not get cut off mid-sentence.**
+{% if max_tokens <= 150 %}
+Keep it to 2-3 punchy sentences.
+{% elif max_tokens <= 300 %}
+Keep it to 1 short paragraph.
+{% else %}
+Keep it to 1-2 exciting paragraphs.
+{% endif %}
+{% endif %}
+
+Keep it punchy and action-packed. Use active voice and dynamic verbs.
+Don't include game mechanics in the narrative - just the story.
+
+Respond only with the narrative - no dice rolls or damage numbers.

api/app/ai/templates/npc_dialogue.j2

@@ -0,0 +1,138 @@
+{#
+NPC Dialogue Prompt Template - Enhanced with persistent NPC data.
+Used for generating contextual NPC conversations with rich personality.
+
+Required context:
+- character: Player character information (name, level, player_class)
+- npc: NPC information with personality, appearance, dialogue_hooks
+- conversation_topic: What the player wants to discuss
+- game_state: Current game state
+
+Optional context:
+- npc_knowledge: List of information the NPC can share
+- revealed_secrets: Secrets being revealed this conversation
+- interaction_count: Number of times player has talked to this NPC
+- relationship_level: 0-100 relationship score (50 is neutral)
+- previous_dialogue: Previous exchanges with this NPC
+#}
+You are roleplaying as an NPC in a fantasy world, having a conversation with a player character.
+
+## The NPC
+**{{ npc.name }}** - {{ npc.role }}
+
+{% if npc.appearance %}
+- **Appearance:** {{ npc.appearance if npc.appearance is string else npc.appearance.brief if npc.appearance.brief else npc.appearance }}
+{% endif %}
+
+{% if npc.personality %}
+{% if npc.personality.traits %}
+- **Personality Traits:** {{ npc.personality.traits | join(', ') }}
+{% elif npc.personality is string %}
+- **Personality:** {{ npc.personality }}
+{% endif %}
+{% if npc.personality.speech_style %}
+- **Speaking Style:** {{ npc.personality.speech_style }}
+{% endif %}
+{% if npc.personality.quirks %}
+- **Quirks:** {{ npc.personality.quirks | join('; ') }}
+{% endif %}
+{% endif %}
+
+{% if npc.dialogue_hooks and npc.dialogue_hooks.greeting %}
+- **Typical Greeting:** "{{ npc.dialogue_hooks.greeting }}"
+{% endif %}
+
+{% if npc.goals %}
+- **Current Goals:** {{ npc.goals }}
+{% endif %}
+
+## The Player Character
+**{{ character.name }}** - Level {{ character.level }} {{ character.player_class }}
+{% if interaction_count and interaction_count > 1 %}
+- **Familiarity:** This is conversation #{{ interaction_count }} - the NPC recognizes {{ character.name }}
+{% endif %}
+{% if relationship_level %}
+{% if relationship_level >= 80 %}
+- **Relationship:** Close friend ({{ relationship_level }}/100) - treats player warmly
+{% elif relationship_level >= 60 %}
+- **Relationship:** Friendly acquaintance ({{ relationship_level }}/100) - helpful and open
+{% elif relationship_level >= 40 %}
+- **Relationship:** Neutral ({{ relationship_level }}/100) - professional but guarded
+{% elif relationship_level >= 20 %}
+- **Relationship:** Distrustful ({{ relationship_level }}/100) - wary and curt
+{% else %}
+- **Relationship:** Hostile ({{ relationship_level }}/100) - dismissive or antagonistic
+{% endif %}
+{% endif %}
+
+## Current Setting
+- **Location:** {{ game_state.current_location }}
+{% if game_state.time_of_day %}
+- **Time:** {{ game_state.time_of_day }}
+{% endif %}
+{% if game_state.active_quests %}
+- **Player's Active Quests:** {{ game_state.active_quests | length }}
+{% endif %}
+
+{% if npc_knowledge %}
+## Knowledge the NPC May Share
+The NPC knows about the following (share naturally as relevant to conversation):
+{% for info in npc_knowledge %}
+- {{ info }}
+{% endfor %}
+{% endif %}
+
+{% if revealed_secrets %}
+## IMPORTANT: Secrets to Reveal This Conversation
+Based on the player's relationship with this NPC, naturally reveal the following:
+{% for secret in revealed_secrets %}
+- {{ secret }}
+{% endfor %}
+Work these into the dialogue naturally - don't dump all information at once.
+Make it feel earned, like the NPC is opening up to someone they trust.
+{% endif %}
+
+{% if npc.relationships %}
+## NPC Relationships (for context)
+{% for rel in npc.relationships %}
+- Feels {{ rel.attitude }} toward {{ rel.npc_id }}{% if rel.reason %} ({{ rel.reason }}){% endif %}
+
+{% endfor %}
+{% endif %}
+
+{% if previous_dialogue %}
+## Previous Conversation
+{% for exchange in previous_dialogue[-2:] %}
+- **{{ character.name }}:** {{ exchange.player_line | truncate_text(100) }}
+- **{{ npc.name }}:** {{ exchange.npc_response | truncate_text(100) }}
+{% endfor %}
+{% endif %}
+
+## Player Says
+"{{ conversation_topic }}"
+
+## Your Task
+Respond as {{ npc.name }} in character. Generate dialogue that:
+1. **Matches the NPC's personality and speech style exactly** - use their quirks, accent, and manner
+2. **Acknowledges the relationship** - be warmer to friends, cooler to strangers
+3. **Shares relevant knowledge naturally** - don't info-dump, weave it into conversation
+4. **Reveals secrets if specified** - make it feel like earned trust, not random exposition
+5. **Feels alive and memorable** - give this NPC a distinct voice
+
+{% if max_tokens %}
+**IMPORTANT: Your response must be under {{ (max_tokens * 0.6) | int }} words (approximately {{ max_tokens }} tokens). Complete all sentences - do not get cut off mid-sentence.**
+{% if max_tokens <= 150 %}
+Keep it to 1-2 sentences of dialogue.
+{% elif max_tokens <= 300 %}
+Keep it to 2-3 sentences of dialogue.
+{% else %}
+Keep it to 2-4 sentences of dialogue.
+{% endif %}
+{% else %}
+Keep the response to 2-4 sentences of dialogue.
+{% endif %}
+
+You may include brief action/emotion tags in *asterisks* to show gestures and expressions.
+
+Respond only as the NPC - no narration or out-of-character text.
+Format: *action/emotion* "Dialogue goes here."

api/app/ai/templates/quest_offering.j2

@@ -0,0 +1,61 @@
+{#
+Quest Offering Prompt Template
+Used for AI to select the most contextually appropriate quest.
+
+Required context:
+- eligible_quests: List of quest objects that can be offered
+- game_context: Current game state information
+- character: Character information
+
+Optional context:
+- recent_actions: Recent player actions
+#}
+You are selecting the most appropriate quest to offer to a player based on their current context.
+
+## Player Character
+**{{ character.name }}** - Level {{ character.level }} {{ character.player_class }}
+{% if character.completed_quests %}
+- Completed Quests: {{ character.completed_quests | length }}
+{% endif %}
+
+## Current Context
+- **Location:** {{ game_context.current_location }} ({{ game_context.location_type }})
+{% if recent_actions %}
+- **Recent Actions:**
+{% for action in recent_actions[-3:] %}
+  - {{ action }}
+{% endfor %}
+{% endif %}
+{% if game_context.active_quests %}
+- **Active Quests:** {{ game_context.active_quests | length }} in progress
+{% endif %}
+{% if game_context.world_events %}
+- **Current Events:** {{ game_context.world_events | join(', ') }}
+{% endif %}
+
+## Available Quests
+{% for quest in eligible_quests %}
+### {{ loop.index }}. {{ quest.name }}
+- **Quest ID:** {{ quest.quest_id }}
+- **Difficulty:** {{ quest.difficulty }}
+- **Quest Giver:** {{ quest.quest_giver }}
+- **Description:** {{ quest.description | truncate_text(200) }}
+- **Narrative Hooks:**
+{% for hook in quest.narrative_hooks %}
+  - {{ hook }}
+{% endfor %}
+{% endfor %}
+
+## Your Task
+Select the ONE quest that best fits the current narrative context.
+
+Consider:
+1. Which quest's narrative hooks connect best to the player's recent actions?
+2. Which quest giver makes sense for this location?
+3. Which difficulty is appropriate for the character's level and situation?
+4. Which quest would feel most natural to discover right now?
+
+Respond with ONLY the quest_id of your selection on a single line.
+Example response: quest_goblin_cave
+
+Do not include any explanation - just the quest_id.

api/app/ai/templates/story_action.j2

@@ -0,0 +1,112 @@
+{#
+Story Action Prompt Template
+Used for generating DM responses to player story actions.
+
+Required context:
+- character: Character object with name, level, player_class, stats
+- game_state: GameState with current_location, location_type, active_quests
+- action: String describing the player's action
+- conversation_history: List of recent conversation entries (optional)
+
+Optional context:
+- custom_topic: For specific queries
+- world_context: Additional world information
+#}
+You are the Dungeon Master for {{ character.name }}, a level {{ character.level }} {{ character.player_class }}.
+
+## Character Status
+- **Health:** {{ character.current_hp }}/{{ character.max_hp }} HP
+- **Stats:** {{ character.stats | format_stats }}
+{% if character.skills %}
+- **Skills:** {{ character.skills | format_skills }}
+{% endif %}
+{% if character.effects %}
+- **Active Effects:** {{ character.effects | format_effects }}
+{% endif %}
+
+## Current Situation
+- **Location:** {{ game_state.current_location }} ({{ game_state.location_type }})
+{% if game_state.discovered_locations %}
+- **Known Locations:** {{ game_state.discovered_locations | join(', ') }}
+{% endif %}
+{% if game_state.active_quests %}
+- **Active Quests:** {{ game_state.active_quests | length }} quest(s) in progress
+{% endif %}
+{% if game_state.time_of_day %}
+- **Time:** {{ game_state.time_of_day }}
+{% endif %}
+
+{% if location %}
+## Location Details
+- **Place:** {{ location.name }}
+- **Type:** {{ location.type if location.type else game_state.location_type }}
+{% if location.description %}
+- **Description:** {{ location.description | truncate_text(300) }}
+{% endif %}
+{% if location.ambient %}
+- **Atmosphere:** {{ location.ambient | truncate_text(200) }}
+{% endif %}
+{% if location.lore %}
+- **Lore:** {{ location.lore | truncate_text(150) }}
+{% endif %}
+{% endif %}
+
+{% if npcs_present %}
+## NPCs Present
+{% for npc in npcs_present %}
+- **{{ npc.name }}** ({{ npc.role }}): {{ npc.appearance if npc.appearance is string else npc.appearance.brief if npc.appearance else 'No description' }}
+{% endfor %}
+These NPCs are available for conversation. Include them naturally in the scene if relevant.
+{% endif %}
+
+{% if conversation_history %}
+## Recent History
+{% for entry in conversation_history[-3:] %}
+- **Turn {{ entry.turn }}:** {{ entry.action }}
+  > {{ entry.dm_response }}
+{% endfor %}
+{% endif %}
+
+## Player Action
+{{ action }}
+
+{% if action_instructions %}
+## Action-Specific Instructions
+{{ action_instructions }}
+{% endif %}
+
+## Your Task
+Generate a narrative response that:
+1. Acknowledges the player's action and describes their attempt
+2. Describes what happens as a result, including any discoveries or consequences
+3. Sets up the next decision point or opportunity for action
+
+{% if max_tokens %}
+**IMPORTANT: Your response must be under {{ (max_tokens * 0.7) | int }} words (approximately {{ max_tokens }} tokens). Complete all sentences - do not get cut off mid-sentence.**
+{% if max_tokens <= 150 %}
+Keep it to 1 short paragraph (2-3 sentences).
+{% elif max_tokens <= 300 %}
+Keep it to 1 paragraph (4-5 sentences).
+{% elif max_tokens <= 600 %}
+Keep it to 1-2 paragraphs.
+{% else %}
+Keep it to 2-3 paragraphs.
+{% endif %}
+{% endif %}
+
+Keep the tone immersive and engaging. Use vivid descriptions but stay concise.
+If the action involves NPCs, give them personality and realistic reactions.
+If the action could fail or succeed, describe the outcome based on the character's abilities.
+
+**CRITICAL RULES - Player Agency:**
+- NEVER make decisions for the player (no auto-purchasing, no automatic commitments)
+- NEVER complete transactions without explicit player consent
+- NEVER take items or spend gold without the player choosing to do so
+- Present options, choices, or discoveries - then let the player decide
+- End with clear options or a question about what they want to do next
+- If items/services have costs, always state prices and ask if they want to proceed
+
+{% if world_context %}
+## World Context
+{{ world_context }}
+{% endif %}

api/app/api/auth.py

@@ -0,0 +1,529 @@
+"""
+Authentication API Blueprint
+
+This module provides API endpoints for user authentication and management:
+- User registration
+- User login/logout
+- Email verification
+- Password reset
+
+All endpoints follow the standard API response format defined in app.utils.response.
+"""
+
+import re
+from flask import Blueprint, request, make_response, render_template, redirect, url_for, flash
+from appwrite.exception import AppwriteException
+
+from app.services.appwrite_service import AppwriteService
+from app.utils.response import (
+    success_response,
+    created_response,
+    error_response,
+    unauthorized_response,
+    validation_error_response
+)
+from app.utils.auth import require_auth, get_current_user, extract_session_token
+from app.utils.logging import get_logger
+from app.config import get_config
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+# Create blueprint
+auth_bp = Blueprint('auth', __name__)
+
+
+# ===== VALIDATION FUNCTIONS =====
+
+def validate_email(email: str) -> tuple[bool, str]:
+    """
+    Validate email address format.
+
+    Args:
+        email: Email address to validate
+
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    if not email:
+        return False, "Email is required"
+
+    config = get_config()
+    max_length = config.auth.email_max_length
+
+    if len(email) > max_length:
+        return False, f"Email must be no more than {max_length} characters"
+
+    # Email regex pattern
+    pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
+    if not re.match(pattern, email):
+        return False, "Invalid email format"
+
+    return True, ""
+
+
+def validate_password(password: str) -> tuple[bool, str]:
+    """
+    Validate password strength.
+
+    Args:
+        password: Password to validate
+
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    if not password:
+        return False, "Password is required"
+
+    config = get_config()
+
+    min_length = config.auth.password_min_length
+    if len(password) < min_length:
+        return False, f"Password must be at least {min_length} characters long"
+
+    if len(password) > 128:
+        return False, "Password must be no more than 128 characters"
+
+    errors = []
+
+    if config.auth.password_require_uppercase and not re.search(r'[A-Z]', password):
+        errors.append("at least one uppercase letter")
+
+    if config.auth.password_require_lowercase and not re.search(r'[a-z]', password):
+        errors.append("at least one lowercase letter")
+
+    if config.auth.password_require_number and not re.search(r'[0-9]', password):
+        errors.append("at least one number")
+
+    if config.auth.password_require_special and not re.search(r'[!@#$%^&*()_+\-=\[\]{}|;:,.<>?]', password):
+        errors.append("at least one special character")
+
+    if errors:
+        return False, f"Password must contain {', '.join(errors)}"
+
+    return True, ""
+
+
+def validate_name(name: str) -> tuple[bool, str]:
+    """
+    Validate user name.
+
+    Args:
+        name: Name to validate
+
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    if not name:
+        return False, "Name is required"
+
+    config = get_config()
+
+    min_length = config.auth.name_min_length
+    max_length = config.auth.name_max_length
+
+    if len(name) < min_length:
+        return False, f"Name must be at least {min_length} characters"
+
+    if len(name) > max_length:
+        return False, f"Name must be no more than {max_length} characters"
+
+    # Allow letters, spaces, hyphens, apostrophes
+    if not re.match(r"^[a-zA-Z\s\-']+$", name):
+        return False, "Name can only contain letters, spaces, hyphens, and apostrophes"
+
+    return True, ""
+
+
+# ===== API ENDPOINTS =====
+
+@auth_bp.route('/api/v1/auth/register', methods=['POST'])
+def api_register():
+    """
+    Register a new user account.
+
+    Request Body:
+        {
+            "email": "user@example.com",
+            "password": "SecurePass123!",
+            "name": "Player Name"
+        }
+
+    Returns:
+        201: User created successfully
+        400: Validation error or email already exists
+        500: Internal server error
+    """
+    try:
+        # Get request data
+        data = request.get_json()
+
+        if not data:
+            return validation_error_response({"error": "Request body is required"})
+
+        email = data.get('email', '').strip().lower()
+        password = data.get('password', '')
+        name = data.get('name', '').strip()
+
+        # Validate inputs
+        validation_errors = {}
+
+        email_valid, email_error = validate_email(email)
+        if not email_valid:
+            validation_errors['email'] = email_error
+
+        password_valid, password_error = validate_password(password)
+        if not password_valid:
+            validation_errors['password'] = password_error
+
+        name_valid, name_error = validate_name(name)
+        if not name_valid:
+            validation_errors['name'] = name_error
+
+        if validation_errors:
+            return validation_error_response(validation_errors)
+
+        # Register user
+        appwrite = AppwriteService()
+        user_data = appwrite.register_user(email=email, password=password, name=name)
+
+        logger.info("User registered successfully", user_id=user_data.id, email=email)
+
+        return created_response(
+            result={
+                "user": user_data.to_dict(),
+                "message": "Registration successful. Please check your email to verify your account."
+            }
+        )
+
+    except AppwriteException as e:
+        logger.error("Registration failed", error=str(e), code=e.code)
+
+        # Check for specific error codes
+        if e.code == 409:  # Conflict - user already exists
+            return validation_error_response({"email": "An account with this email already exists"})
+
+        return error_response(message="Registration failed. Please try again.", code="REGISTRATION_ERROR")
+
+    except Exception as e:
+        logger.error("Unexpected error during registration", error=str(e))
+        return error_response(message="An unexpected error occurred", code="INTERNAL_ERROR")
+
+
+@auth_bp.route('/api/v1/auth/login', methods=['POST'])
+def api_login():
+    """
+    Authenticate a user and create a session.
+
+    Request Body:
+        {
+            "email": "user@example.com",
+            "password": "SecurePass123!",
+            "remember_me": false
+        }
+
+    Returns:
+        200: Login successful, session cookie set
+        401: Invalid credentials
+        400: Validation error
+        500: Internal server error
+    """
+    try:
+        # Get request data
+        data = request.get_json()
+
+        if not data:
+            return validation_error_response({"error": "Request body is required"})
+
+        email = data.get('email', '').strip().lower()
+        password = data.get('password', '')
+        remember_me = data.get('remember_me', False)
+
+        # Validate inputs
+        if not email:
+            return validation_error_response({"email": "Email is required"})
+
+        if not password:
+            return validation_error_response({"password": "Password is required"})
+
+        # Authenticate user
+        appwrite = AppwriteService()
+        session_data, user_data = appwrite.login_user(email=email, password=password)
+
+        logger.info("User logged in successfully", user_id=user_data.id, email=email)
+
+        # Set session cookie
+        config = get_config()
+        duration = config.auth.duration_remember_me if remember_me else config.auth.duration_normal
+
+        response = make_response(success_response(
+            result={
+                "user": user_data.to_dict(),
+                "message": "Login successful"
+            }
+        ))
+
+        response.set_cookie(
+            key=config.auth.cookie_name,
+            value=session_data.session_id,
+            max_age=duration,
+            httponly=config.auth.http_only,
+            secure=config.auth.secure,
+            samesite=config.auth.same_site,
+            path=config.auth.path
+        )
+
+        return response
+
+    except AppwriteException as e:
+        logger.warning("Login failed", email=email if 'email' in locals() else 'unknown', error=str(e), code=e.code)
+
+        # Generic error message for security (don't reveal if email exists)
+        return unauthorized_response(message="Invalid email or password")
+
+    except Exception as e:
+        logger.error("Unexpected error during login", error=str(e))
+        return error_response(message="An unexpected error occurred", code="INTERNAL_ERROR")
+
+
+@auth_bp.route('/api/v1/auth/logout', methods=['POST'])
+@require_auth
+def api_logout():
+    """
+    Log out the current user by deleting their session.
+
+    Returns:
+        200: Logout successful, session cookie cleared
+        401: Not authenticated
+        500: Internal server error
+    """
+    try:
+        # Get session token
+        token = extract_session_token()
+
+        if not token:
+            return unauthorized_response(message="No active session")
+
+        # Logout user
+        appwrite = AppwriteService()
+        appwrite.logout_user(session_id=token)
+
+        user = get_current_user()
+        logger.info("User logged out successfully", user_id=user.id if user else 'unknown')
+
+        # Clear session cookie
+        config = get_config()
+
+        response = make_response(success_response(
+            result={"message": "Logout successful"}
+        ))
+
+        response.set_cookie(
+            key=config.auth.cookie_name,
+            value='',
+            max_age=0,
+            httponly=config.auth.http_only,
+            secure=config.auth.secure,
+            samesite=config.auth.same_site,
+            path=config.auth.path
+        )
+
+        return response
+
+    except AppwriteException as e:
+        logger.error("Logout failed", error=str(e), code=e.code)
+        return error_response(message="Logout failed", code="LOGOUT_ERROR")
+
+    except Exception as e:
+        logger.error("Unexpected error during logout", error=str(e))
+        return error_response(message="An unexpected error occurred", code="INTERNAL_ERROR")
+
+
+@auth_bp.route('/api/v1/auth/verify-email', methods=['GET'])
+def api_verify_email():
+    """
+    Verify a user's email address.
+
+    Query Parameters:
+        userId: User ID from verification link
+        secret: Verification secret from verification link
+
+    Returns:
+        Redirects to login page with success/error message
+    """
+    try:
+        user_id = request.args.get('userId')
+        secret = request.args.get('secret')
+
+        if not user_id or not secret:
+            flash("Invalid verification link", "error")
+            return redirect(url_for('auth.login_page'))
+
+        # Verify email
+        appwrite = AppwriteService()
+        appwrite.verify_email(user_id=user_id, secret=secret)
+
+        logger.info("Email verified successfully", user_id=user_id)
+
+        flash("Email verified successfully! You can now log in.", "success")
+        return redirect(url_for('auth.login_page'))
+
+    except AppwriteException as e:
+        logger.error("Email verification failed", error=str(e), code=e.code)
+        flash("Email verification failed. The link may be invalid or expired.", "error")
+        return redirect(url_for('auth.login_page'))
+
+    except Exception as e:
+        logger.error("Unexpected error during email verification", error=str(e))
+        flash("An unexpected error occurred", "error")
+        return redirect(url_for('auth.login_page'))
+
+
+@auth_bp.route('/api/v1/auth/forgot-password', methods=['POST'])
+def api_forgot_password():
+    """
+    Request a password reset email.
+
+    Request Body:
+        {
+            "email": "user@example.com"
+        }
+
+    Returns:
+        200: Always returns success (for security, don't reveal if email exists)
+        400: Validation error
+        500: Internal server error
+    """
+    try:
+        # Get request data
+        data = request.get_json()
+
+        if not data:
+            return validation_error_response({"error": "Request body is required"})
+
+        email = data.get('email', '').strip().lower()
+
+        # Validate email
+        email_valid, email_error = validate_email(email)
+        if not email_valid:
+            return validation_error_response({"email": email_error})
+
+        # Request password reset
+        appwrite = AppwriteService()
+        appwrite.request_password_reset(email=email)
+
+        logger.info("Password reset requested", email=email)
+
+        # Always return success for security
+        return success_response(
+            result={
+                "message": "If an account exists with this email, you will receive a password reset link shortly."
+            }
+        )
+
+    except Exception as e:
+        logger.error("Unexpected error during password reset request", error=str(e))
+        # Still return success for security
+        return success_response(
+            result={
+                "message": "If an account exists with this email, you will receive a password reset link shortly."
+            }
+        )
+
+
+@auth_bp.route('/api/v1/auth/reset-password', methods=['POST'])
+def api_reset_password():
+    """
+    Confirm password reset and update password.
+
+    Request Body:
+        {
+            "user_id": "user_id_from_link",
+            "secret": "secret_from_link",
+            "password": "NewSecurePass123!"
+        }
+
+    Returns:
+        200: Password reset successful
+        400: Validation error or invalid/expired link
+        500: Internal server error
+    """
+    try:
+        # Get request data
+        data = request.get_json()
+
+        if not data:
+            return validation_error_response({"error": "Request body is required"})
+
+        user_id = data.get('user_id', '').strip()
+        secret = data.get('secret', '').strip()
+        password = data.get('password', '')
+
+        # Validate inputs
+        validation_errors = {}
+
+        if not user_id:
+            validation_errors['user_id'] = "User ID is required"
+
+        if not secret:
+            validation_errors['secret'] = "Reset secret is required"
+
+        password_valid, password_error = validate_password(password)
+        if not password_valid:
+            validation_errors['password'] = password_error
+
+        if validation_errors:
+            return validation_error_response(validation_errors)
+
+        # Confirm password reset
+        appwrite = AppwriteService()
+        appwrite.confirm_password_reset(user_id=user_id, secret=secret, password=password)
+
+        logger.info("Password reset successfully", user_id=user_id)
+
+        return success_response(
+            result={
+                "message": "Password reset successful. You can now log in with your new password."
+            }
+        )
+
+    except AppwriteException as e:
+        logger.error("Password reset failed", error=str(e), code=e.code)
+        return error_response(
+            message="Password reset failed. The link may be invalid or expired.",
+            code="PASSWORD_RESET_ERROR"
+        )
+
+    except Exception as e:
+        logger.error("Unexpected error during password reset", error=str(e))
+        return error_response(message="An unexpected error occurred", code="INTERNAL_ERROR")
+
+
+# ===== TEMPLATE ROUTES (for rendering HTML pages) =====
+
+@auth_bp.route('/login', methods=['GET'])
+def login_page():
+    """Render the login page."""
+    return render_template('auth/login.html')
+
+
+@auth_bp.route('/register', methods=['GET'])
+def register_page():
+    """Render the registration page."""
+    return render_template('auth/register.html')
+
+
+@auth_bp.route('/forgot-password', methods=['GET'])
+def forgot_password_page():
+    """Render the forgot password page."""
+    return render_template('auth/forgot_password.html')
+
+
+@auth_bp.route('/reset-password', methods=['GET'])
+def reset_password_page():
+    """Render the reset password page."""
+    user_id = request.args.get('userId', '')
+    secret = request.args.get('secret', '')
+
+    return render_template('auth/reset_password.html', user_id=user_id, secret=secret)

api/app/api/characters.py

@@ -0,0 +1,898 @@
+"""
+Character API Blueprint
+
+This module provides API endpoints for character management:
+- List user's characters
+- Get character details
+- Create new character
+- Delete character
+- Unlock skills
+- Respec skills
+
+All endpoints require authentication and enforce ownership validation.
+"""
+
+from flask import Blueprint, request
+
+from app.services.character_service import (
+    get_character_service,
+    CharacterLimitExceeded,
+    CharacterNotFound,
+    SkillUnlockError,
+    InsufficientGold
+)
+from app.services.class_loader import get_class_loader
+from app.services.origin_service import get_origin_service
+from app.utils.response import (
+    success_response,
+    created_response,
+    error_response,
+    not_found_response,
+    validation_error_response
+)
+from app.utils.auth import require_auth, get_current_user
+from app.utils.logging import get_logger
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+# Create blueprint
+characters_bp = Blueprint('characters', __name__)
+
+
+# ===== VALIDATION FUNCTIONS =====
+
+def validate_character_name(name: str) -> tuple[bool, str]:
+    """
+    Validate character name.
+
+    Args:
+        name: Character name to validate
+
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    if not name:
+        return False, "Character name is required"
+
+    if len(name) < 2:
+        return False, "Character name must be at least 2 characters"
+
+    if len(name) > 50:
+        return False, "Character name must be no more than 50 characters"
+
+    # Allow letters, spaces, hyphens, apostrophes, and common fantasy characters
+    if not all(c.isalnum() or c in " -'" for c in name):
+        return False, "Character name can only contain letters, numbers, spaces, hyphens, and apostrophes"
+
+    return True, ""
+
+
+def validate_class_id(class_id: str) -> tuple[bool, str]:
+    """
+    Validate class ID.
+
+    Args:
+        class_id: Class ID to validate
+
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    if not class_id:
+        return False, "Class ID is required"
+
+    valid_classes = [
+        'vanguard', 'assassin', 'arcanist', 'luminary',
+        'wildstrider', 'oathkeeper', 'necromancer', 'lorekeeper'
+    ]
+
+    if class_id not in valid_classes:
+        return False, f"Invalid class ID. Must be one of: {', '.join(valid_classes)}"
+
+    return True, ""
+
+
+def validate_origin_id(origin_id: str) -> tuple[bool, str]:
+    """
+    Validate origin ID.
+
+    Args:
+        origin_id: Origin ID to validate
+
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    if not origin_id:
+        return False, "Origin ID is required"
+
+    valid_origins = [
+        'soul_revenant', 'memory_thief', 'shadow_apprentice', 'escaped_captive'
+    ]
+
+    if origin_id not in valid_origins:
+        return False, f"Invalid origin ID. Must be one of: {', '.join(valid_origins)}"
+
+    return True, ""
+
+
+def validate_skill_id(skill_id: str) -> tuple[bool, str]:
+    """
+    Validate skill ID.
+
+    Args:
+        skill_id: Skill ID to validate
+
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    if not skill_id:
+        return False, "Skill ID is required"
+
+    if len(skill_id) > 100:
+        return False, "Skill ID is too long"
+
+    return True, ""
+
+
+# ===== API ENDPOINTS =====
+
+@characters_bp.route('/api/v1/characters', methods=['GET'])
+@require_auth
+def list_characters():
+    """
+    List all characters owned by the current user.
+
+    Returns:
+        200: List of characters
+        401: Not authenticated
+        500: Internal server error
+
+    Example Response:
+        {
+            "result": {
+                "characters": [
+                    {
+                        "character_id": "char_001",
+                        "name": "Thorin Ironheart",
+                        "class": "warrior",
+                        "level": 5,
+                        "gold": 1000
+                    }
+                ],
+                "count": 1,
+                "tier": "free",
+                "limit": 1
+            }
+        }
+    """
+    try:
+        user = get_current_user()
+        logger.info("Listing characters", user_id=user.id)
+
+        # Get character service
+        char_service = get_character_service()
+
+        # Get user's characters
+        characters = char_service.get_user_characters(user.id)
+
+        # Get tier information
+        tier = user.tier
+        from app.services.character_service import CHARACTER_LIMITS
+        limit = CHARACTER_LIMITS.get(tier, 1)
+
+        # Convert characters to dict format
+        character_list = [
+            {
+                "character_id": char.character_id,
+                "name": char.name,
+                "class": char.player_class.class_id,
+                "class_name": char.player_class.name,
+                "level": char.level,
+                "experience": char.experience,
+                "gold": char.gold,
+                "current_location": char.current_location,
+                "origin": char.origin.id
+            }
+            for char in characters
+        ]
+
+        logger.info("Characters listed successfully",
+                   user_id=user.id,
+                   count=len(characters))
+
+        return success_response(
+            result={
+                "characters": character_list,
+                "count": len(characters),
+                "tier": tier,
+                "limit": limit
+            }
+        )
+
+    except Exception as e:
+        logger.error("Failed to list characters",
+                    user_id=user.id if user else 'unknown',
+                    error=str(e))
+        return error_response(
+            code="CHARACTER_LIST_ERROR",
+            message="Failed to retrieve characters",
+            status=500
+        )
+
+
+@characters_bp.route('/api/v1/characters/<character_id>', methods=['GET'])
+@require_auth
+def get_character(character_id: str):
+    """
+    Get detailed information about a specific character.
+
+    Args:
+        character_id: Character ID
+
+    Returns:
+        200: Character details
+        401: Not authenticated
+        404: Character not found or not owned by user
+        500: Internal server error
+
+    Example Response:
+        {
+            "result": {
+                "character_id": "char_001",
+                "name": "Thorin Ironheart",
+                "class": {...},
+                "origin": {...},
+                "level": 5,
+                "experience": 250,
+                "base_stats": {...},
+                "unlocked_skills": [...],
+                "inventory": [...],
+                "equipped": {...},
+                "gold": 1000
+            }
+        }
+    """
+    try:
+        user = get_current_user()
+        logger.info("Getting character",
+                   user_id=user.id,
+                   character_id=character_id)
+
+        # Get character service
+        char_service = get_character_service()
+
+        # Get character (ownership validated in service)
+        character = char_service.get_character(character_id, user.id)
+
+        logger.info("Character retrieved successfully",
+                   user_id=user.id,
+                   character_id=character_id)
+
+        return success_response(result=character.to_dict())
+
+    except CharacterNotFound as e:
+        logger.warning("Character not found",
+                      user_id=user.id,
+                      character_id=character_id,
+                      error=str(e))
+        return not_found_response(message=str(e))
+
+    except Exception as e:
+        logger.error("Failed to get character",
+                    user_id=user.id,
+                    character_id=character_id,
+                    error=str(e))
+        return error_response(
+            code="CHARACTER_GET_ERROR",
+            message="Failed to retrieve character",
+            status=500
+        )
+
+
+@characters_bp.route('/api/v1/characters', methods=['POST'])
+@require_auth
+def create_character():
+    """
+    Create a new character for the current user.
+
+    Request Body:
+        {
+            "name": "Thorin Ironheart",
+            "class_id": "warrior",
+            "origin_id": "soul_revenant"
+        }
+
+    Returns:
+        201: Character created successfully
+        400: Validation error or character limit exceeded
+        401: Not authenticated
+        500: Internal server error
+
+    Example Response:
+        {
+            "result": {
+                "character_id": "char_001",
+                "name": "Thorin Ironheart",
+                "class": "warrior",
+                "level": 1,
+                "message": "Character created successfully"
+            }
+        }
+    """
+    try:
+        user = get_current_user()
+
+        # Get request data
+        data = request.get_json()
+
+        if not data:
+            return validation_error_response(
+                message="Request body is required",
+                details={"error": "Request body is required"}
+            )
+
+        name = data.get('name', '').strip()
+        class_id = data.get('class_id', '').strip().lower()
+        origin_id = data.get('origin_id', '').strip().lower()
+
+        # Validate inputs
+        validation_errors = {}
+
+        name_valid, name_error = validate_character_name(name)
+        if not name_valid:
+            validation_errors['name'] = name_error
+
+        class_valid, class_error = validate_class_id(class_id)
+        if not class_valid:
+            validation_errors['class_id'] = class_error
+
+        origin_valid, origin_error = validate_origin_id(origin_id)
+        if not origin_valid:
+            validation_errors['origin_id'] = origin_error
+
+        if validation_errors:
+            return validation_error_response(
+                message="Validation failed",
+                details=validation_errors
+            )
+
+        logger.info("Creating character",
+                   user_id=user.id,
+                   name=name,
+                   class_id=class_id,
+                   origin_id=origin_id)
+
+        # Get character service
+        char_service = get_character_service()
+
+        # Create character
+        character = char_service.create_character(
+            user_id=user.id,
+            name=name,
+            class_id=class_id,
+            origin_id=origin_id
+        )
+
+        logger.info("Character created successfully",
+                   user_id=user.id,
+                   character_id=character.character_id,
+                   name=name)
+
+        return created_response(
+            result={
+                "character_id": character.character_id,
+                "name": character.name,
+                "class": character.player_class.class_id,
+                "class_name": character.player_class.name,
+                "origin": character.origin.id,
+                "origin_name": character.origin.name,
+                "level": character.level,
+                "gold": character.gold,
+                "current_location": character.current_location,
+                "message": "Character created successfully"
+            }
+        )
+
+    except CharacterLimitExceeded as e:
+        logger.warning("Character limit exceeded",
+                      user_id=user.id,
+                      error=str(e))
+        return error_response(
+            code="CHARACTER_LIMIT_EXCEEDED",
+            message=str(e),
+            status=400
+        )
+
+    except ValueError as e:
+        logger.warning("Invalid class or origin",
+                      user_id=user.id,
+                      error=str(e))
+        return validation_error_response(
+            message=str(e),
+            details={"error": str(e)}
+        )
+
+    except Exception as e:
+        logger.error("Failed to create character",
+                    user_id=user.id,
+                    error=str(e))
+        return error_response(
+            code="CHARACTER_CREATE_ERROR",
+            message="Failed to create character",
+            status=500
+        )
+
+
+@characters_bp.route('/api/v1/characters/<character_id>', methods=['DELETE'])
+@require_auth
+def delete_character(character_id: str):
+    """
+    Delete a character (soft delete - marks as inactive).
+
+    Args:
+        character_id: Character ID
+
+    Returns:
+        200: Character deleted successfully
+        401: Not authenticated
+        404: Character not found or not owned by user
+        500: Internal server error
+
+    Example Response:
+        {
+            "result": {
+                "message": "Character deleted successfully",
+                "character_id": "char_001"
+            }
+        }
+    """
+    try:
+        user = get_current_user()
+        logger.info("Deleting character",
+                   user_id=user.id,
+                   character_id=character_id)
+
+        # Get character service
+        char_service = get_character_service()
+
+        # Delete character (ownership validated in service)
+        char_service.delete_character(character_id, user.id)
+
+        logger.info("Character deleted successfully",
+                   user_id=user.id,
+                   character_id=character_id)
+
+        return success_response(
+            result={
+                "message": "Character deleted successfully",
+                "character_id": character_id
+            }
+        )
+
+    except CharacterNotFound as e:
+        logger.warning("Character not found for deletion",
+                      user_id=user.id,
+                      character_id=character_id,
+                      error=str(e))
+        return not_found_response(message=str(e))
+
+    except Exception as e:
+        logger.error("Failed to delete character",
+                    user_id=user.id,
+                    character_id=character_id,
+                    error=str(e))
+        return error_response(
+            code="CHARACTER_DELETE_ERROR",
+            message="Failed to delete character",
+            status=500
+        )
+
+
+@characters_bp.route('/api/v1/characters/<character_id>/skills/unlock', methods=['POST'])
+@require_auth
+def unlock_skill(character_id: str):
+    """
+    Unlock a skill for a character.
+
+    Args:
+        character_id: Character ID
+
+    Request Body:
+        {
+            "skill_id": "power_strike"
+        }
+
+    Returns:
+        200: Skill unlocked successfully
+        400: Validation error or unlock requirements not met
+        401: Not authenticated
+        404: Character not found or not owned by user
+        500: Internal server error
+
+    Example Response:
+        {
+            "result": {
+                "message": "Skill unlocked successfully",
+                "character_id": "char_001",
+                "skill_id": "power_strike",
+                "unlocked_skills": ["power_strike"],
+                "available_points": 0
+            }
+        }
+    """
+    try:
+        user = get_current_user()
+
+        # Get request data
+        data = request.get_json()
+
+        if not data:
+            return validation_error_response(
+                message="Request body is required",
+                details={"error": "Request body is required"}
+            )
+
+        skill_id = data.get('skill_id', '').strip()
+
+        # Validate skill_id
+        skill_valid, skill_error = validate_skill_id(skill_id)
+        if not skill_valid:
+            return validation_error_response(
+                message="Validation failed",
+                details={"skill_id": skill_error}
+            )
+
+        logger.info("Unlocking skill",
+                   user_id=user.id,
+                   character_id=character_id,
+                   skill_id=skill_id)
+
+        # Get character service
+        char_service = get_character_service()
+
+        # Unlock skill (validates ownership, prerequisites, skill points)
+        character = char_service.unlock_skill(character_id, user.id, skill_id)
+
+        # Calculate available skill points
+        available_points = character.level - len(character.unlocked_skills)
+
+        logger.info("Skill unlocked successfully",
+                   user_id=user.id,
+                   character_id=character_id,
+                   skill_id=skill_id,
+                   available_points=available_points)
+
+        return success_response(
+            result={
+                "message": "Skill unlocked successfully",
+                "character_id": character_id,
+                "skill_id": skill_id,
+                "unlocked_skills": character.unlocked_skills,
+                "available_points": available_points
+            }
+        )
+
+    except CharacterNotFound as e:
+        logger.warning("Character not found for skill unlock",
+                      user_id=user.id,
+                      character_id=character_id,
+                      error=str(e))
+        return not_found_response(message=str(e))
+
+    except SkillUnlockError as e:
+        logger.warning("Skill unlock failed",
+                      user_id=user.id,
+                      character_id=character_id,
+                      skill_id=skill_id if 'skill_id' in locals() else 'unknown',
+                      error=str(e))
+        return error_response(
+            code="SKILL_UNLOCK_ERROR",
+            message=str(e),
+            status=400
+        )
+
+    except Exception as e:
+        logger.error("Failed to unlock skill",
+                    user_id=user.id,
+                    character_id=character_id,
+                    error=str(e))
+        return error_response(
+            code="SKILL_UNLOCK_ERROR",
+            message="Failed to unlock skill",
+            status=500
+        )
+
+
+@characters_bp.route('/api/v1/characters/<character_id>/skills/respec', methods=['POST'])
+@require_auth
+def respec_skills(character_id: str):
+    """
+    Reset all unlocked skills for a character.
+
+    Cost: level × 100 gold
+
+    Args:
+        character_id: Character ID
+
+    Returns:
+        200: Skills reset successfully
+        400: Insufficient gold
+        401: Not authenticated
+        404: Character not found or not owned by user
+        500: Internal server error
+
+    Example Response:
+        {
+            "result": {
+                "message": "Skills reset successfully",
+                "character_id": "char_001",
+                "cost": 500,
+                "remaining_gold": 500,
+                "available_points": 5
+            }
+        }
+    """
+    try:
+        user = get_current_user()
+        logger.info("Respecing character skills",
+                   user_id=user.id,
+                   character_id=character_id)
+
+        # Get character service
+        char_service = get_character_service()
+
+        # Get character to calculate cost
+        character = char_service.get_character(character_id, user.id)
+        respec_cost = character.level * 100
+
+        # Respec skills (validates ownership and gold)
+        character = char_service.respec_skills(character_id, user.id)
+
+        # Calculate available skill points
+        available_points = character.level - len(character.unlocked_skills)
+
+        logger.info("Skills respeced successfully",
+                   user_id=user.id,
+                   character_id=character_id,
+                   cost=respec_cost,
+                   remaining_gold=character.gold,
+                   available_points=available_points)
+
+        return success_response(
+            result={
+                "message": "Skills reset successfully",
+                "character_id": character_id,
+                "cost": respec_cost,
+                "remaining_gold": character.gold,
+                "available_points": available_points
+            }
+        )
+
+    except CharacterNotFound as e:
+        logger.warning("Character not found for respec",
+                      user_id=user.id,
+                      character_id=character_id,
+                      error=str(e))
+        return not_found_response(message=str(e))
+
+    except InsufficientGold as e:
+        logger.warning("Insufficient gold for respec",
+                      user_id=user.id,
+                      character_id=character_id,
+                      error=str(e))
+        return error_response(
+            code="INSUFFICIENT_GOLD",
+            message=str(e),
+            status=400
+        )
+
+    except Exception as e:
+        logger.error("Failed to respec skills",
+                    user_id=user.id,
+                    character_id=character_id,
+                    error=str(e))
+        return error_response(
+            code="RESPEC_ERROR",
+            message="Failed to reset skills",
+            status=500
+        )
+
+
+# ===== CLASSES & ORIGINS ENDPOINTS (Reference Data) =====
+
+@characters_bp.route('/api/v1/classes', methods=['GET'])
+def list_classes():
+    """
+    List all available player classes.
+
+    This endpoint provides reference data for character creation.
+    No authentication required.
+
+    Returns:
+        200: List of all classes with basic info
+        500: Internal server error
+
+    Example Response:
+        {
+            "result": {
+                "classes": [
+                    {
+                        "class_id": "vanguard",
+                        "name": "Vanguard",
+                        "description": "Armored warrior...",
+                        "base_stats": {...},
+                        "skill_trees": ["Shield Bearer", "Weapon Master"]
+                    }
+                ],
+                "count": 8
+            }
+        }
+    """
+    try:
+        logger.info("Listing all classes")
+
+        # Get class loader
+        class_loader = get_class_loader()
+
+        # Get all class IDs
+        class_ids = class_loader.get_all_class_ids()
+
+        # Load all classes
+        classes = []
+        for class_id in class_ids:
+            player_class = class_loader.load_class(class_id)
+            if player_class:
+                classes.append({
+                    "class_id": player_class.class_id,
+                    "name": player_class.name,
+                    "description": player_class.description,
+                    "base_stats": player_class.base_stats.to_dict(),
+                    "skill_trees": [tree.name for tree in player_class.skill_trees],
+                    "starting_equipment": player_class.starting_equipment,
+                    "starting_abilities": player_class.starting_abilities
+                })
+
+        logger.info("Classes listed successfully", count=len(classes))
+
+        return success_response(
+            result={
+                "classes": classes,
+                "count": len(classes)
+            }
+        )
+
+    except Exception as e:
+        logger.error("Failed to list classes", error=str(e))
+        return error_response(
+            code="CLASS_LIST_ERROR",
+            message="Failed to retrieve classes",
+            status=500
+        )
+
+
+@characters_bp.route('/api/v1/classes/<class_id>', methods=['GET'])
+def get_class(class_id: str):
+    """
+    Get detailed information about a specific class.
+
+    This endpoint provides full class data including skill trees.
+    No authentication required.
+
+    Args:
+        class_id: Class ID (e.g., "vanguard", "assassin")
+
+    Returns:
+        200: Full class details with skill trees
+        404: Class not found
+        500: Internal server error
+
+    Example Response:
+        {
+            "result": {
+                "class_id": "vanguard",
+                "name": "Vanguard",
+                "description": "Armored warrior...",
+                "base_stats": {...},
+                "skill_trees": [
+                    {
+                        "tree_id": "shield_bearer",
+                        "name": "Shield Bearer",
+                        "nodes": [...]
+                    }
+                ],
+                "starting_equipment": [...],
+                "starting_abilities": [...]
+            }
+        }
+    """
+    try:
+        logger.info("Getting class details", class_id=class_id)
+
+        # Get class loader
+        class_loader = get_class_loader()
+
+        # Load class
+        player_class = class_loader.load_class(class_id)
+
+        if not player_class:
+            logger.warning("Class not found", class_id=class_id)
+            return not_found_response(message=f"Class not found: {class_id}")
+
+        logger.info("Class retrieved successfully", class_id=class_id)
+
+        # Return full class data
+        return success_response(result=player_class.to_dict())
+
+    except Exception as e:
+        logger.error("Failed to get class",
+                    class_id=class_id,
+                    error=str(e))
+        return error_response(
+            code="CLASS_GET_ERROR",
+            message="Failed to retrieve class",
+            status=500
+        )
+
+
+@characters_bp.route('/api/v1/origins', methods=['GET'])
+def list_origins():
+    """
+    List all available character origins.
+
+    This endpoint provides reference data for character creation.
+    No authentication required.
+
+    Returns:
+        200: List of all origins
+        500: Internal server error
+
+    Example Response:
+        {
+            "result": {
+                "origins": [
+                    {
+                        "id": "soul_revenant",
+                        "name": "Soul Revenant",
+                        "description": "Returned from death...",
+                        "starting_location": {...},
+                        "narrative_hooks": [...],
+                        "starting_bonus": {...}
+                    }
+                ],
+                "count": 4
+            }
+        }
+    """
+    try:
+        logger.info("Listing all origins")
+
+        # Get origin service
+        origin_service = get_origin_service()
+
+        # Get all origin IDs
+        origin_ids = origin_service.get_all_origin_ids()
+
+        # Load all origins
+        origins = []
+        for origin_id in origin_ids:
+            origin = origin_service.load_origin(origin_id)
+            if origin:
+                origins.append(origin.to_dict())
+
+        logger.info("Origins listed successfully", count=len(origins))
+
+        return success_response(
+            result={
+                "origins": origins,
+                "count": len(origins)
+            }
+        )
+
+    except Exception as e:
+        logger.error("Failed to list origins", error=str(e))
+        return error_response(
+            code="ORIGIN_LIST_ERROR",
+            message="Failed to retrieve origins",
+            status=500
+        )

api/app/api/game_mechanics.py

@@ -0,0 +1,302 @@
+"""
+Game Mechanics API Blueprint
+
+This module provides API endpoints for game mechanics that determine
+outcomes before AI narration:
+- Skill checks (perception, persuasion, stealth, etc.)
+- Search/loot actions
+- Dice rolls
+
+These endpoints return structured results that can be used for UI
+dice animations and then passed to AI for narrative description.
+"""
+
+from flask import Blueprint, request
+
+from app.services.outcome_service import outcome_service
+from app.services.character_service import get_character_service, CharacterNotFound
+from app.game_logic.dice import SkillType, Difficulty
+from app.utils.response import (
+    success_response,
+    error_response,
+    not_found_response,
+    validation_error_response
+)
+from app.utils.auth import require_auth, get_current_user
+from app.utils.logging import get_logger
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+# Create blueprint
+game_mechanics_bp = Blueprint('game_mechanics', __name__, url_prefix='/api/v1/game')
+
+
+# Valid skill types for API validation
+VALID_SKILL_TYPES = [skill.name.lower() for skill in SkillType]
+
+# Valid difficulty names
+VALID_DIFFICULTIES = ["trivial", "easy", "medium", "hard", "very_hard", "nearly_impossible"]
+
+
+@game_mechanics_bp.route('/check', methods=['POST'])
+@require_auth
+def perform_check():
+    """
+    Perform a skill check or search action.
+
+    This endpoint determines the outcome of chance-based actions before
+    they are passed to AI for narration. The result includes all dice
+    roll details for UI display.
+
+    Request JSON:
+        {
+            "character_id": "...",
+            "check_type": "search" | "skill",
+            "skill": "perception",  // Required for skill checks
+            "dc": 15,  // Optional, can use difficulty instead
+            "difficulty": "medium",  // Optional, alternative to dc
+            "location_type": "forest",  // For search checks
+            "context": {}  // Optional additional context
+        }
+
+    Returns:
+        For search checks:
+        {
+            "check_result": {
+                "roll": 14,
+                "modifier": 3,
+                "total": 17,
+                "dc": 15,
+                "success": true,
+                "margin": 2
+            },
+            "items_found": [...],
+            "gold_found": 5
+        }
+
+        For skill checks:
+        {
+            "check_result": {...},
+            "context": {
+                "skill_used": "persuasion",
+                "stat_used": "charisma",
+                ...
+            }
+        }
+    """
+    user = get_current_user()
+    data = request.get_json()
+
+    if not data:
+        return validation_error_response(
+            message="Request body is required",
+            details={"field": "body", "issue": "Missing JSON body"}
+        )
+
+    # Validate required fields
+    character_id = data.get("character_id")
+    check_type = data.get("check_type")
+
+    if not character_id:
+        return validation_error_response(
+            message="Character ID is required",
+            details={"field": "character_id", "issue": "Missing required field"}
+        )
+
+    if not check_type:
+        return validation_error_response(
+            message="Check type is required",
+            details={"field": "check_type", "issue": "Missing required field"}
+        )
+
+    if check_type not in ["search", "skill"]:
+        return validation_error_response(
+            message="Invalid check type",
+            details={"field": "check_type", "issue": "Must be 'search' or 'skill'"}
+        )
+
+    # Get character and verify ownership
+    try:
+        character_service = get_character_service()
+        character = character_service.get_character(character_id)
+
+        if character.user_id != user["user_id"]:
+            return error_response(
+                status_code=403,
+                message="You don't have permission to access this character",
+                error_code="FORBIDDEN"
+            )
+    except CharacterNotFound:
+        return not_found_response(
+            message=f"Character not found: {character_id}"
+        )
+    except Exception as e:
+        logger.error("character_fetch_error", error=str(e), character_id=character_id)
+        return error_response(
+            status_code=500,
+            message="Failed to fetch character",
+            error_code="CHARACTER_FETCH_ERROR"
+        )
+
+    # Determine DC from difficulty name or direct value
+    dc = data.get("dc")
+    difficulty = data.get("difficulty")
+
+    if dc is None and difficulty:
+        if difficulty.lower() not in VALID_DIFFICULTIES:
+            return validation_error_response(
+                message="Invalid difficulty",
+                details={
+                    "field": "difficulty",
+                    "issue": f"Must be one of: {', '.join(VALID_DIFFICULTIES)}"
+                }
+            )
+        dc = outcome_service.get_dc_for_difficulty(difficulty)
+    elif dc is None:
+        # Default to medium difficulty
+        dc = Difficulty.MEDIUM.value
+
+    # Validate DC range
+    if not isinstance(dc, int) or dc < 1 or dc > 35:
+        return validation_error_response(
+            message="Invalid DC value",
+            details={"field": "dc", "issue": "DC must be an integer between 1 and 35"}
+        )
+
+    # Get optional bonus
+    bonus = data.get("bonus", 0)
+    if not isinstance(bonus, int):
+        bonus = 0
+
+    # Perform the check based on type
+    try:
+        if check_type == "search":
+            # Search check uses perception
+            location_type = data.get("location_type", "default")
+            outcome = outcome_service.determine_search_outcome(
+                character=character,
+                location_type=location_type,
+                dc=dc,
+                bonus=bonus
+            )
+
+            logger.info(
+                "search_check_performed",
+                user_id=user["user_id"],
+                character_id=character_id,
+                location_type=location_type,
+                success=outcome.check_result.success
+            )
+
+            return success_response(result=outcome.to_dict())
+
+        else:  # skill check
+            skill = data.get("skill")
+            if not skill:
+                return validation_error_response(
+                    message="Skill is required for skill checks",
+                    details={"field": "skill", "issue": "Missing required field"}
+                )
+
+            skill_lower = skill.lower()
+            if skill_lower not in VALID_SKILL_TYPES:
+                return validation_error_response(
+                    message="Invalid skill type",
+                    details={
+                        "field": "skill",
+                        "issue": f"Must be one of: {', '.join(VALID_SKILL_TYPES)}"
+                    }
+                )
+
+            # Convert to SkillType enum
+            skill_type = SkillType[skill.upper()]
+
+            # Get additional context
+            context = data.get("context", {})
+
+            outcome = outcome_service.determine_skill_check_outcome(
+                character=character,
+                skill_type=skill_type,
+                dc=dc,
+                bonus=bonus,
+                context=context
+            )
+
+            logger.info(
+                "skill_check_performed",
+                user_id=user["user_id"],
+                character_id=character_id,
+                skill=skill_lower,
+                success=outcome.check_result.success
+            )
+
+            return success_response(result=outcome.to_dict())
+
+    except Exception as e:
+        logger.error(
+            "check_error",
+            error=str(e),
+            check_type=check_type,
+            character_id=character_id
+        )
+        return error_response(
+            status_code=500,
+            message="Failed to perform check",
+            error_code="CHECK_ERROR"
+        )
+
+
+@game_mechanics_bp.route('/skills', methods=['GET'])
+def list_skills():
+    """
+    List all available skill types.
+
+    Returns the skill types available for skill checks,
+    along with their associated base stats.
+
+    Returns:
+        {
+            "skills": [
+                {
+                    "name": "perception",
+                    "stat": "wisdom",
+                    "description": "..."
+                },
+                ...
+            ]
+        }
+    """
+    skills = []
+    for skill in SkillType:
+        skills.append({
+            "name": skill.name.lower(),
+            "stat": skill.value,
+        })
+
+    return success_response(result={"skills": skills})
+
+
+@game_mechanics_bp.route('/difficulties', methods=['GET'])
+def list_difficulties():
+    """
+    List all difficulty levels and their DC values.
+
+    Returns:
+        {
+            "difficulties": [
+                {"name": "trivial", "dc": 5},
+                {"name": "easy", "dc": 10},
+                ...
+            ]
+        }
+    """
+    difficulties = []
+    for diff in Difficulty:
+        difficulties.append({
+            "name": diff.name.lower(),
+            "dc": diff.value,
+        })
+
+    return success_response(result={"difficulties": difficulties})

api/app/api/health.py

@@ -0,0 +1,60 @@
+"""
+Health Check API Blueprint
+
+This module provides a simple health check endpoint for monitoring
+and testing API connectivity.
+"""
+
+from flask import Blueprint
+from app.utils.response import success_response
+from app.utils.logging import get_logger
+from app.config import get_config
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+# Create blueprint
+health_bp = Blueprint('health', __name__, url_prefix='/api/v1')
+
+
+@health_bp.route('/health', methods=['GET'])
+def health_check():
+    """
+    Health check endpoint.
+
+    Returns basic service status and version information.
+    Useful for monitoring, load balancers, and testing API connectivity.
+
+    Returns:
+        JSON response with status "ok" and version info
+
+    Example:
+        GET /api/v1/health
+
+        Response:
+        {
+            "app": "Code of Conquest",
+            "version": "0.1.0",
+            "status": 200,
+            "timestamp": "2025-11-16T...",
+            "result": {
+                "status": "ok",
+                "service": "Code of Conquest API",
+                "version": "0.1.0"
+            },
+            "error": null,
+            "meta": {}
+        }
+    """
+    config = get_config()
+
+    logger.debug("Health check requested")
+
+    return success_response(
+        result={
+            "status": "ok",
+            "service": "Code of Conquest API",
+            "version": config.app.version
+        }
+    )

api/app/api/jobs.py

@@ -0,0 +1,71 @@
+"""
+Jobs API Blueprint
+
+This module provides API endpoints for job status polling:
+- Get job status
+- Get job result
+
+All endpoints require authentication.
+"""
+
+from flask import Blueprint
+
+from app.tasks.ai_tasks import get_job_status, get_job_result
+from app.utils.response import (
+    success_response,
+    not_found_response,
+    error_response
+)
+from app.utils.auth import require_auth
+from app.utils.logging import get_logger
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+# Create blueprint
+jobs_bp = Blueprint('jobs', __name__)
+
+
+@jobs_bp.route('/api/v1/jobs/<job_id>/status', methods=['GET'])
+@require_auth
+def job_status(job_id: str):
+    """
+    Get the status of an AI job.
+
+    Args:
+        job_id: The job ID returned from action submission
+
+    Returns:
+        JSON response with job status and result if completed
+    """
+    try:
+        status_info = get_job_status(job_id)
+
+        if not status_info or status_info.get('status') == 'not_found':
+            return not_found_response(f"Job not found: {job_id}")
+
+        # If completed, include the result
+        if status_info.get('status') == 'completed':
+            result = get_job_result(job_id)
+            if result:
+                status_info['dm_response'] = result.get('dm_response', '')
+                status_info['tokens_used'] = result.get('tokens_used', 0)
+                status_info['model'] = result.get('model', '')
+
+        logger.debug("Job status retrieved",
+                    job_id=job_id,
+                    status=status_info.get('status'))
+
+        return success_response(status_info)
+
+    except Exception as e:
+        logger.error("Failed to get job status",
+                    job_id=job_id,
+                    error=str(e),
+                    exc_info=True)
+        return error_response(
+            status=500,
+            code="JOB_STATUS_ERROR",
+            message="Failed to get job status"
+        )

api/app/api/npcs.py

@@ -0,0 +1,429 @@
+"""
+NPC API Blueprint
+
+This module provides API endpoints for NPC interactions:
+- Get NPC details
+- Talk to NPC (queues AI dialogue generation)
+- Get NPCs at location
+
+All endpoints require authentication and enforce ownership validation.
+"""
+
+from datetime import datetime, timezone
+from flask import Blueprint, request
+
+from app.services.session_service import get_session_service, SessionNotFound
+from app.services.character_service import get_character_service, CharacterNotFound
+from app.services.npc_loader import get_npc_loader
+from app.services.location_loader import get_location_loader
+from app.tasks.ai_tasks import enqueue_ai_task, TaskType
+from app.utils.response import (
+    success_response,
+    accepted_response,
+    error_response,
+    not_found_response,
+    validation_error_response
+)
+from app.utils.auth import require_auth, get_current_user
+from app.utils.logging import get_logger
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+# Create blueprint
+npcs_bp = Blueprint('npcs', __name__)
+
+
+@npcs_bp.route('/api/v1/npcs/<npc_id>', methods=['GET'])
+@require_auth
+def get_npc_details(npc_id: str):
+    """
+    Get NPC details with knowledge filtered by character interaction state.
+
+    Path params:
+        npc_id: NPC ID to get details for
+
+    Query params:
+        character_id: Optional character ID for filtering revealed secrets
+
+    Returns:
+        JSON response with NPC details
+    """
+    try:
+        user = get_current_user()
+        character_id = request.args.get('character_id')
+
+        # Load NPC
+        npc_loader = get_npc_loader()
+        npc = npc_loader.load_npc(npc_id)
+
+        if not npc:
+            return not_found_response("NPC not found")
+
+        npc_data = npc.to_dict()
+
+        # Filter knowledge based on character interaction state
+        if character_id:
+            try:
+                character_service = get_character_service()
+                character = character_service.get_character(character_id, user.id)
+
+                if character:
+                    # Get revealed secrets based on conditions
+                    revealed = character_service.check_npc_secret_conditions(character, npc)
+
+                    # Build available knowledge (public + revealed)
+                    available_knowledge = []
+                    if npc.knowledge:
+                        available_knowledge.extend(npc.knowledge.public)
+                        available_knowledge.extend(revealed)
+
+                    npc_data["available_knowledge"] = available_knowledge
+
+                    # Remove secret knowledge from response
+                    if npc_data.get("knowledge"):
+                        npc_data["knowledge"]["secret"] = []
+                        npc_data["knowledge"]["will_share_if"] = []
+
+                    # Add interaction summary
+                    interaction = character.npc_interactions.get(npc_id, {})
+                    npc_data["interaction_summary"] = {
+                        "interaction_count": interaction.get("interaction_count", 0),
+                        "relationship_level": interaction.get("relationship_level", 50),
+                        "first_met": interaction.get("first_met"),
+                    }
+
+            except CharacterNotFound:
+                logger.debug("Character not found for NPC filter", character_id=character_id)
+
+        return success_response(npc_data)
+
+    except Exception as e:
+        logger.error("Failed to get NPC details",
+                    npc_id=npc_id,
+                    error=str(e))
+        return error_response("Failed to get NPC", 500)
+
+
+@npcs_bp.route('/api/v1/npcs/<npc_id>/talk', methods=['POST'])
+@require_auth
+def talk_to_npc(npc_id: str):
+    """
+    Initiate conversation with an NPC.
+
+    Validates NPC is at current location, updates interaction state,
+    and queues AI dialogue generation task.
+
+    Path params:
+        npc_id: NPC ID to talk to
+
+    Request body:
+        session_id: Active session ID
+        topic: Conversation topic/opener (default: "greeting")
+        player_response: What the player says to the NPC (overrides topic if provided)
+
+    Returns:
+        JSON response with job_id for polling result
+    """
+    try:
+        user = get_current_user()
+        data = request.get_json()
+
+        session_id = data.get('session_id')
+        # player_response overrides topic for bidirectional dialogue
+        player_response = data.get('player_response')
+        topic = player_response if player_response else data.get('topic', 'greeting')
+
+        if not session_id:
+            return validation_error_response("session_id is required")
+
+        # Get session
+        session_service = get_session_service()
+        session = session_service.get_session(session_id, user.id)
+
+        # Load NPC
+        npc_loader = get_npc_loader()
+        npc = npc_loader.load_npc(npc_id)
+
+        if not npc:
+            return not_found_response("NPC not found")
+
+        # Validate NPC is at current location
+        if npc.location_id != session.game_state.current_location:
+            logger.warning("NPC not at current location",
+                          npc_id=npc_id,
+                          npc_location=npc.location_id,
+                          current_location=session.game_state.current_location)
+            return error_response("NPC is not at your current location", 400)
+
+        # Get character
+        character_service = get_character_service()
+        character = character_service.get_character(session.solo_character_id, user.id)
+
+        # Get or create interaction state
+        now = datetime.now(timezone.utc).isoformat().replace("+00:00", "Z")
+        interaction = character.npc_interactions.get(npc_id, {})
+
+        if not interaction:
+            # First meeting
+            interaction = {
+                "npc_id": npc_id,
+                "first_met": now,
+                "last_interaction": now,
+                "interaction_count": 1,
+                "revealed_secrets": [],
+                "relationship_level": 50,
+                "custom_flags": {},
+            }
+        else:
+            # Update existing interaction
+            interaction["last_interaction"] = now
+            interaction["interaction_count"] = interaction.get("interaction_count", 0) + 1
+
+        # Check for newly revealed secrets
+        revealed = character_service.check_npc_secret_conditions(character, npc)
+
+        # Update character with new interaction state
+        character_service.update_npc_interaction(
+            character.character_id,
+            user.id,
+            npc_id,
+            interaction
+        )
+
+        # Build NPC knowledge for AI context
+        npc_knowledge = []
+        if npc.knowledge:
+            npc_knowledge.extend(npc.knowledge.public)
+            npc_knowledge.extend(revealed)
+
+        # Get previous dialogue history for context (last 3 exchanges)
+        previous_dialogue = character_service.get_npc_dialogue_history(
+            character.character_id,
+            user.id,
+            npc_id,
+            limit=3
+        )
+
+        # Prepare AI context
+        task_context = {
+            "session_id": session_id,
+            "character_id": character.character_id,
+            "character": character.to_story_dict(),
+            "npc": npc.to_story_dict(),
+            "npc_full": npc.to_dict(),  # Full NPC data for reference
+            "conversation_topic": topic,
+            "game_state": session.game_state.to_dict(),
+            "npc_knowledge": npc_knowledge,
+            "revealed_secrets": revealed,
+            "interaction_count": interaction["interaction_count"],
+            "relationship_level": interaction.get("relationship_level", 50),
+            "previous_dialogue": previous_dialogue,  # Pass conversation history
+        }
+
+        # Enqueue AI task
+        result = enqueue_ai_task(
+            task_type=TaskType.NPC_DIALOGUE,
+            user_id=user.id,
+            context=task_context,
+            priority="normal",
+            session_id=session_id,
+            character_id=character.character_id
+        )
+
+        logger.info("NPC dialogue task queued",
+                   user_id=user.id,
+                   npc_id=npc_id,
+                   job_id=result.get('job_id'),
+                   interaction_count=interaction["interaction_count"])
+
+        return accepted_response({
+            "job_id": result.get('job_id'),
+            "status": "queued",
+            "message": f"Starting conversation with {npc.name}...",
+            "npc_name": npc.name,
+            "npc_role": npc.role,
+        })
+
+    except SessionNotFound:
+        return not_found_response("Session not found")
+    except CharacterNotFound:
+        return not_found_response("Character not found")
+    except Exception as e:
+        logger.error("Failed to talk to NPC",
+                    npc_id=npc_id,
+                    error=str(e))
+        return error_response("Failed to start conversation", 500)
+
+
+@npcs_bp.route('/api/v1/npcs/at-location/<location_id>', methods=['GET'])
+@require_auth
+def get_npcs_at_location(location_id: str):
+    """
+    Get all NPCs at a specific location.
+
+    Path params:
+        location_id: Location ID to get NPCs for
+
+    Returns:
+        JSON response with list of NPCs at location
+    """
+    try:
+        npc_loader = get_npc_loader()
+        npcs = npc_loader.get_npcs_at_location(location_id)
+
+        npcs_list = []
+        for npc in npcs:
+            npcs_list.append({
+                "npc_id": npc.npc_id,
+                "name": npc.name,
+                "role": npc.role,
+                "appearance": npc.appearance.brief,
+                "tags": npc.tags,
+            })
+
+        return success_response({
+            "location_id": location_id,
+            "npcs": npcs_list,
+        })
+
+    except Exception as e:
+        logger.error("Failed to get NPCs at location",
+                    location_id=location_id,
+                    error=str(e))
+        return error_response("Failed to get NPCs", 500)
+
+
+@npcs_bp.route('/api/v1/npcs/<npc_id>/relationship', methods=['POST'])
+@require_auth
+def adjust_npc_relationship(npc_id: str):
+    """
+    Adjust relationship level with an NPC.
+
+    Path params:
+        npc_id: NPC ID
+
+    Request body:
+        character_id: Character ID
+        adjustment: Amount to add/subtract (can be negative)
+
+    Returns:
+        JSON response with updated relationship level
+    """
+    try:
+        user = get_current_user()
+        data = request.get_json()
+
+        character_id = data.get('character_id')
+        adjustment = data.get('adjustment', 0)
+
+        if not character_id:
+            return validation_error_response("character_id is required")
+
+        if not isinstance(adjustment, int):
+            return validation_error_response("adjustment must be an integer")
+
+        # Validate NPC exists
+        npc_loader = get_npc_loader()
+        npc = npc_loader.load_npc(npc_id)
+
+        if not npc:
+            return not_found_response("NPC not found")
+
+        # Adjust relationship
+        character_service = get_character_service()
+        character = character_service.adjust_npc_relationship(
+            character_id,
+            user.id,
+            npc_id,
+            adjustment
+        )
+
+        new_level = character.npc_interactions.get(npc_id, {}).get("relationship_level", 50)
+
+        logger.info("NPC relationship adjusted",
+                   npc_id=npc_id,
+                   character_id=character_id,
+                   adjustment=adjustment,
+                   new_level=new_level)
+
+        return success_response({
+            "npc_id": npc_id,
+            "relationship_level": new_level,
+        })
+
+    except CharacterNotFound:
+        return not_found_response("Character not found")
+    except Exception as e:
+        logger.error("Failed to adjust NPC relationship",
+                    npc_id=npc_id,
+                    error=str(e))
+        return error_response("Failed to adjust relationship", 500)
+
+
+@npcs_bp.route('/api/v1/npcs/<npc_id>/flag', methods=['POST'])
+@require_auth
+def set_npc_flag(npc_id: str):
+    """
+    Set a custom flag on NPC interaction (e.g., "helped_with_rats": true).
+
+    Path params:
+        npc_id: NPC ID
+
+    Request body:
+        character_id: Character ID
+        flag_name: Name of the flag
+        flag_value: Value to set
+
+    Returns:
+        JSON response confirming flag was set
+    """
+    try:
+        user = get_current_user()
+        data = request.get_json()
+
+        character_id = data.get('character_id')
+        flag_name = data.get('flag_name')
+        flag_value = data.get('flag_value')
+
+        if not character_id:
+            return validation_error_response("character_id is required")
+        if not flag_name:
+            return validation_error_response("flag_name is required")
+
+        # Validate NPC exists
+        npc_loader = get_npc_loader()
+        npc = npc_loader.load_npc(npc_id)
+
+        if not npc:
+            return not_found_response("NPC not found")
+
+        # Set flag
+        character_service = get_character_service()
+        character_service.set_npc_custom_flag(
+            character_id,
+            user.id,
+            npc_id,
+            flag_name,
+            flag_value
+        )
+
+        logger.info("NPC flag set",
+                   npc_id=npc_id,
+                   character_id=character_id,
+                   flag_name=flag_name)
+
+        return success_response({
+            "npc_id": npc_id,
+            "flag_name": flag_name,
+            "flag_value": flag_value,
+        })
+
+    except CharacterNotFound:
+        return not_found_response("Character not found")
+    except Exception as e:
+        logger.error("Failed to set NPC flag",
+                    npc_id=npc_id,
+                    error=str(e))
+        return error_response("Failed to set flag", 500)

api/app/api/sessions.py

@@ -0,0 +1,604 @@
+"""
+Sessions API Blueprint
+
+This module provides API endpoints for story session management:
+- Create new solo session
+- Get session state
+- Take action (async AI processing)
+- Get conversation history
+
+All endpoints require authentication and enforce ownership validation.
+"""
+
+from flask import Blueprint, request, g
+
+from app.services.session_service import (
+    get_session_service,
+    SessionNotFound,
+    SessionLimitExceeded,
+    SessionValidationError
+)
+from app.services.character_service import CharacterNotFound, get_character_service
+from app.services.rate_limiter_service import RateLimiterService, RateLimitExceeded
+from app.services.action_prompt_loader import ActionPromptLoader, ActionPromptNotFoundError
+from app.services.outcome_service import outcome_service
+from app.tasks.ai_tasks import enqueue_ai_task, TaskType, get_job_status, get_job_result
+from app.ai.model_selector import UserTier
+from app.models.action_prompt import LocationType
+from app.game_logic.dice import SkillType
+from app.utils.response import (
+    success_response,
+    created_response,
+    accepted_response,
+    error_response,
+    not_found_response,
+    validation_error_response,
+    rate_limit_exceeded_response
+)
+from app.utils.auth import require_auth, get_current_user
+from app.utils.logging import get_logger
+from app.config import get_config
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+# Create blueprint
+sessions_bp = Blueprint('sessions', __name__)
+
+
+# ===== VALIDATION FUNCTIONS =====
+
+def validate_character_id(character_id: str) -> tuple[bool, str]:
+    """
+    Validate character ID format.
+
+    Args:
+        character_id: Character ID to validate
+
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    if not character_id:
+        return False, "Character ID is required"
+
+    if not isinstance(character_id, str):
+        return False, "Character ID must be a string"
+
+    if len(character_id) > 100:
+        return False, "Character ID is too long"
+
+    return True, ""
+
+
+def validate_action_request(data: dict, user_tier: UserTier) -> tuple[bool, str]:
+    """
+    Validate action request data.
+
+    Args:
+        data: Request JSON data
+        user_tier: User's subscription tier
+
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    action_type = data.get('action_type')
+
+    if action_type != 'button':
+        return False, "action_type must be 'button'"
+
+    if not data.get('prompt_id'):
+        return False, "prompt_id is required for button actions"
+
+    return True, ""
+
+
+def get_user_tier_from_user(user) -> UserTier:
+    """
+    Get UserTier enum from user object.
+
+    Args:
+        user: User object from auth
+
+    Returns:
+        UserTier enum value
+    """
+    # Map user tier string to UserTier enum
+    tier_mapping = {
+        'free': UserTier.FREE,
+        'basic': UserTier.BASIC,
+        'premium': UserTier.PREMIUM,
+        'elite': UserTier.ELITE
+    }
+
+    user_tier_str = getattr(user, 'tier', 'free').lower()
+    return tier_mapping.get(user_tier_str, UserTier.FREE)
+
+
+# ===== API ENDPOINTS =====
+
+@sessions_bp.route('/api/v1/sessions', methods=['GET'])
+@require_auth
+def list_sessions():
+    """
+    List user's active game sessions.
+
+    Returns all active sessions for the authenticated user with basic session info.
+
+    Returns:
+        JSON response with list of sessions
+    """
+    try:
+        user = get_current_user()
+        user_id = user.id
+        session_service = get_session_service()
+
+        # Get user's active sessions
+        sessions = session_service.get_user_sessions(user_id, active_only=True)
+
+        # Build response with basic session info
+        sessions_list = []
+        for session in sessions:
+            sessions_list.append({
+                'session_id': session.session_id,
+                'character_id': session.solo_character_id,
+                'turn_number': session.turn_number,
+                'status': session.status.value,
+                'created_at': session.created_at,
+                'last_activity': session.last_activity,
+                'game_state': {
+                    'current_location': session.game_state.current_location,
+                    'location_type': session.game_state.location_type.value
+                }
+            })
+
+        logger.info("Sessions listed successfully",
+                   user_id=user_id,
+                   count=len(sessions_list))
+
+        return success_response(sessions_list)
+
+    except Exception as e:
+        logger.error("Failed to list sessions", error=str(e))
+        return error_response(f"Failed to list sessions: {str(e)}", 500)
+
+
+@sessions_bp.route('/api/v1/sessions', methods=['POST'])
+@require_auth
+def create_session():
+    """
+    Create a new solo game session.
+
+    Request Body:
+        {
+            "character_id": "char_456"
+        }
+
+    Returns:
+        201: Session created with initial state
+        400: Validation error
+        401: Not authenticated
+        404: Character not found
+        409: Session limit exceeded
+        500: Internal server error
+    """
+    logger.info("Creating new session")
+
+    try:
+        # Get current user
+        user = get_current_user()
+        user_id = user.id
+
+        # Parse and validate request
+        data = request.get_json()
+        if not data:
+            return validation_error_response("Request body is required")
+
+        character_id = data.get('character_id')
+        is_valid, error_msg = validate_character_id(character_id)
+        if not is_valid:
+            return validation_error_response(error_msg)
+
+        # Create session
+        session_service = get_session_service()
+        session = session_service.create_solo_session(
+            user_id=user_id,
+            character_id=character_id
+        )
+
+        logger.info("Session created successfully",
+                   session_id=session.session_id,
+                   user_id=user_id,
+                   character_id=character_id)
+
+        # Return session data
+        return created_response({
+            "session_id": session.session_id,
+            "character_id": session.solo_character_id,
+            "turn_number": session.turn_number,
+            "game_state": {
+                "current_location": session.game_state.current_location,
+                "location_type": session.game_state.location_type.value,
+                "active_quests": session.game_state.active_quests
+            }
+        })
+
+    except CharacterNotFound as e:
+        logger.warning("Character not found for session creation",
+                      error=str(e))
+        return not_found_response("Character not found")
+
+    except SessionLimitExceeded as e:
+        logger.warning("Session limit exceeded",
+                      user_id=user_id if 'user_id' in locals() else 'unknown',
+                      error=str(e))
+        return error_response(
+            status=409,
+            code="SESSION_LIMIT_EXCEEDED",
+            message="Maximum active sessions limit reached (5). Please end an existing session first."
+        )
+
+    except Exception as e:
+        logger.error("Failed to create session",
+                    error=str(e),
+                    exc_info=True)
+        return error_response(
+            status=500,
+            code="SESSION_CREATE_ERROR",
+            message="Failed to create session"
+        )
+
+
+@sessions_bp.route('/api/v1/sessions/<session_id>/action', methods=['POST'])
+@require_auth
+def take_action(session_id: str):
+    """
+    Submit an action for AI processing (async).
+
+    Request Body:
+        {
+            "action_type": "button",
+            "prompt_id": "ask_locals"
+        }
+
+    Returns:
+        202: Action queued for processing
+        400: Validation error
+        401: Not authenticated
+        403: Action not available for tier/location
+        404: Session not found
+        429: Rate limit exceeded
+        500: Internal server error
+    """
+    logger.info("Processing action request", session_id=session_id)
+
+    try:
+        # Get current user
+        user = get_current_user()
+        user_id = user.id
+        user_tier = get_user_tier_from_user(user)
+
+        # Verify session ownership and get session
+        session_service = get_session_service()
+        session = session_service.get_session(session_id, user_id)
+
+        # Parse and validate request
+        data = request.get_json()
+        if not data:
+            return validation_error_response("Request body is required")
+
+        is_valid, error_msg = validate_action_request(data, user_tier)
+        if not is_valid:
+            return validation_error_response(error_msg)
+
+        # Check rate limit
+        rate_limiter = RateLimiterService()
+
+        try:
+            rate_limiter.check_rate_limit(user_id, user_tier)
+        except RateLimitExceeded as e:
+            logger.warning("Rate limit exceeded",
+                         user_id=user_id,
+                         tier=user_tier.value)
+            return rate_limit_exceeded_response(
+                message=f"Daily turn limit reached ({e.limit} turns). Resets at {e.reset_time.strftime('%H:%M UTC')}"
+            )
+
+        # Build action context for AI task
+        prompt_id = data.get('prompt_id')
+
+        # Validate prompt exists and is available
+        loader = ActionPromptLoader()
+        try:
+            action_prompt = loader.get_action_by_id(prompt_id)
+        except ActionPromptNotFoundError:
+            return validation_error_response(f"Invalid prompt_id: {prompt_id}")
+
+        # Check if action is available for user's tier and location
+        location_type = session.game_state.location_type
+        if not action_prompt.is_available(user_tier, location_type):
+            return error_response(
+                status=403,
+                code="ACTION_NOT_AVAILABLE",
+                message="This action is not available for your tier or location"
+            )
+
+        action_text = action_prompt.display_text
+        dm_prompt_template = action_prompt.dm_prompt_template
+
+        # Fetch character data for AI context
+        character_service = get_character_service()
+        character = character_service.get_character(session.solo_character_id, user_id)
+        if not character:
+            return not_found_response(f"Character {session.solo_character_id} not found")
+
+        # Perform dice check if action requires it
+        check_outcome = None
+        if action_prompt.requires_check:
+            check_req = action_prompt.requires_check
+            location_type_str = session.game_state.location_type.value if hasattr(session.game_state.location_type, 'value') else str(session.game_state.location_type)
+
+            # Get DC from difficulty
+            dc = outcome_service.get_dc_for_difficulty(check_req.difficulty)
+
+            if check_req.check_type == "search":
+                # Search check - uses perception and returns items/gold
+                outcome = outcome_service.determine_search_outcome(
+                    character=character,
+                    location_type=location_type_str,
+                    dc=dc
+                )
+                check_outcome = outcome.to_dict()
+
+                logger.info(
+                    "Search check performed",
+                    character_id=character.character_id,
+                    success=outcome.check_result.success,
+                    items_found=len(outcome.items_found),
+                    gold_found=outcome.gold_found
+                )
+            elif check_req.check_type == "skill" and check_req.skill:
+                # Skill check - generic skill vs DC
+                try:
+                    skill_type = SkillType[check_req.skill.upper()]
+                    outcome = outcome_service.determine_skill_check_outcome(
+                        character=character,
+                        skill_type=skill_type,
+                        dc=dc
+                    )
+                    check_outcome = outcome.to_dict()
+
+                    logger.info(
+                        "Skill check performed",
+                        character_id=character.character_id,
+                        skill=check_req.skill,
+                        success=outcome.check_result.success
+                    )
+                except (KeyError, ValueError) as e:
+                    logger.warning(
+                        "Invalid skill type in action prompt",
+                        prompt_id=action_prompt.prompt_id,
+                        skill=check_req.skill,
+                        error=str(e)
+                    )
+
+        # Queue AI task
+        # Use trimmed character data for AI prompts (reduces tokens, focuses on story-relevant info)
+        task_context = {
+            "session_id": session_id,
+            "character_id": session.solo_character_id,
+            "action": action_text,
+            "prompt_id": prompt_id,
+            "dm_prompt_template": dm_prompt_template,
+            "character": character.to_story_dict(),
+            "game_state": session.game_state.to_dict(),
+            "turn_number": session.turn_number,
+            "conversation_history": [entry.to_dict() for entry in session.conversation_history],
+            "world_context": None,  # TODO: Add world context source when available
+            "check_outcome": check_outcome  # Dice check result for predetermined outcomes
+        }
+
+        result = enqueue_ai_task(
+            task_type=TaskType.NARRATIVE,
+            user_id=user_id,
+            context=task_context,
+            priority="normal",
+            session_id=session_id,
+            character_id=session.solo_character_id
+        )
+
+        # Increment rate limit counter
+        rate_limiter.increment_usage(user_id)
+
+        logger.info("Action queued for processing",
+                   session_id=session_id,
+                   job_id=result.get('job_id'),
+                   prompt_id=prompt_id)
+
+        return accepted_response({
+            "job_id": result.get('job_id'),
+            "status": result.get('status', 'queued'),
+            "message": "Your action is being processed..."
+        })
+
+    except SessionNotFound as e:
+        logger.warning("Session not found for action",
+                      session_id=session_id,
+                      error=str(e))
+        return not_found_response("Session not found")
+
+    except Exception as e:
+        logger.error("Failed to process action",
+                    session_id=session_id,
+                    error=str(e),
+                    exc_info=True)
+        return error_response(
+            status=500,
+            code="ACTION_PROCESS_ERROR",
+            message="Failed to process action"
+        )
+
+
+@sessions_bp.route('/api/v1/sessions/<session_id>', methods=['GET'])
+@require_auth
+def get_session_state(session_id: str):
+    """
+    Get current session state with available actions.
+
+    Returns:
+        200: Session state
+        401: Not authenticated
+        404: Session not found
+        500: Internal server error
+    """
+    logger.info("Getting session state", session_id=session_id)
+
+    try:
+        # Get current user
+        user = get_current_user()
+        user_id = user.id
+        user_tier = get_user_tier_from_user(user)
+
+        # Get session
+        session_service = get_session_service()
+        session = session_service.get_session(session_id, user_id)
+
+        # Get available actions based on location and tier
+        loader = ActionPromptLoader()
+        location_type = session.game_state.location_type
+
+        available_actions = []
+        for action in loader.get_available_actions(user_tier, location_type):
+            available_actions.append({
+                "prompt_id": action.prompt_id,
+                "display_text": action.display_text,
+                "description": action.description,
+                "category": action.category.value
+            })
+
+        logger.debug("Session state retrieved",
+                    session_id=session_id,
+                    turn_number=session.turn_number)
+
+        return success_response({
+            "session_id": session.session_id,
+            "character_id": session.get_character_id(),
+            "turn_number": session.turn_number,
+            "status": session.status.value,
+            "game_state": {
+                "current_location": session.game_state.current_location,
+                "location_type": session.game_state.location_type.value,
+                "active_quests": session.game_state.active_quests
+            },
+            "available_actions": available_actions
+        })
+
+    except SessionNotFound as e:
+        logger.warning("Session not found",
+                      session_id=session_id,
+                      error=str(e))
+        return not_found_response("Session not found")
+
+    except Exception as e:
+        logger.error("Failed to get session state",
+                    session_id=session_id,
+                    error=str(e),
+                    exc_info=True)
+        return error_response(
+            status=500,
+            code="SESSION_STATE_ERROR",
+            message="Failed to get session state"
+        )
+
+
+@sessions_bp.route('/api/v1/sessions/<session_id>/history', methods=['GET'])
+@require_auth
+def get_history(session_id: str):
+    """
+    Get conversation history for a session.
+
+    Query Parameters:
+        limit: Number of entries to return (default 20)
+        offset: Number of entries to skip (default 0)
+
+    Returns:
+        200: Paginated conversation history
+        401: Not authenticated
+        404: Session not found
+        500: Internal server error
+    """
+    logger.info("Getting conversation history", session_id=session_id)
+
+    try:
+        # Get current user
+        user = get_current_user()
+        user_id = user.id
+
+        # Get pagination params
+        limit = request.args.get('limit', 20, type=int)
+        offset = request.args.get('offset', 0, type=int)
+
+        # Clamp values
+        limit = max(1, min(limit, 100))  # 1-100
+        offset = max(0, offset)
+
+        # Verify session ownership
+        session_service = get_session_service()
+        session = session_service.get_session(session_id, user_id)
+
+        # Get total history
+        total_history = session.conversation_history
+        total_turns = len(total_history)
+
+        # Apply pagination (from beginning)
+        paginated_history = total_history[offset:offset + limit]
+
+        # Format history entries
+        history_data = []
+        for entry in paginated_history:
+            # Handle timestamp - could be datetime object or already a string
+            timestamp = None
+            if hasattr(entry, 'timestamp') and entry.timestamp:
+                if isinstance(entry.timestamp, str):
+                    timestamp = entry.timestamp
+                else:
+                    timestamp = entry.timestamp.isoformat()
+
+            history_data.append({
+                "turn": entry.turn,
+                "action": entry.action,
+                "dm_response": entry.dm_response,
+                "timestamp": timestamp
+            })
+
+        logger.debug("Conversation history retrieved",
+                    session_id=session_id,
+                    total=total_turns,
+                    returned=len(history_data))
+
+        return success_response({
+            "total_turns": total_turns,
+            "history": history_data,
+            "pagination": {
+                "limit": limit,
+                "offset": offset,
+                "has_more": (offset + limit) < total_turns
+            }
+        })
+
+    except SessionNotFound as e:
+        logger.warning("Session not found for history",
+                      session_id=session_id,
+                      error=str(e))
+        return not_found_response("Session not found")
+
+    except Exception as e:
+        logger.error("Failed to get conversation history",
+                    session_id=session_id,
+                    error=str(e),
+                    exc_info=True)
+        return error_response(
+            status=500,
+            code="HISTORY_ERROR",
+            message="Failed to get conversation history"
+        )

api/app/api/travel.py

@@ -0,0 +1,306 @@
+"""
+Travel API Blueprint
+
+This module provides API endpoints for location-based travel:
+- Get available destinations
+- Travel to a location
+- Get current location details
+
+All endpoints require authentication and enforce ownership validation.
+"""
+
+from flask import Blueprint, request
+
+from app.services.session_service import get_session_service, SessionNotFound
+from app.services.character_service import get_character_service, CharacterNotFound
+from app.services.location_loader import get_location_loader
+from app.services.npc_loader import get_npc_loader
+from app.utils.response import (
+    success_response,
+    error_response,
+    not_found_response,
+    validation_error_response
+)
+from app.utils.auth import require_auth, get_current_user
+from app.utils.logging import get_logger
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+# Create blueprint
+travel_bp = Blueprint('travel', __name__)
+
+
+@travel_bp.route('/api/v1/travel/available', methods=['GET'])
+@require_auth
+def get_available_destinations():
+    """
+    Get all locations the character can travel to.
+
+    Query params:
+        session_id: Active session ID
+
+    Returns:
+        JSON response with list of available destinations
+    """
+    try:
+        user = get_current_user()
+        session_id = request.args.get('session_id')
+
+        if not session_id:
+            return validation_error_response("session_id query parameter is required")
+
+        # Get session and verify ownership
+        session_service = get_session_service()
+        session = session_service.get_session(session_id, user.id)
+
+        # Get character for discovered locations
+        character_service = get_character_service()
+        character = character_service.get_character(session.solo_character_id, user.id)
+
+        # Load location details for each discovered location
+        location_loader = get_location_loader()
+        destinations = []
+
+        for loc_id in character.discovered_locations:
+            # Skip current location
+            if loc_id == session.game_state.current_location:
+                continue
+
+            location = location_loader.load_location(loc_id)
+            if location:
+                destinations.append({
+                    "location_id": location.location_id,
+                    "name": location.name,
+                    "location_type": location.location_type.value,
+                    "region_id": location.region_id,
+                    "description": location.description[:200] + "..." if len(location.description) > 200 else location.description,
+                })
+
+        logger.info("Retrieved available destinations",
+                   user_id=user.id,
+                   session_id=session_id,
+                   destination_count=len(destinations))
+
+        return success_response({
+            "current_location": session.game_state.current_location,
+            "destinations": destinations
+        })
+
+    except SessionNotFound:
+        return not_found_response("Session not found")
+    except CharacterNotFound:
+        return not_found_response("Character not found")
+    except Exception as e:
+        logger.error("Failed to get available destinations",
+                    error=str(e))
+        return error_response("Failed to get destinations", 500)
+
+
+@travel_bp.route('/api/v1/travel', methods=['POST'])
+@require_auth
+def travel_to_location():
+    """
+    Travel to a discovered location.
+
+    Request body:
+        session_id: Active session ID
+        location_id: Target location ID
+
+    Returns:
+        JSON response with new location details and NPCs present
+    """
+    try:
+        user = get_current_user()
+        data = request.get_json()
+
+        session_id = data.get('session_id')
+        location_id = data.get('location_id')
+
+        # Validate required fields
+        if not session_id:
+            return validation_error_response("session_id is required")
+        if not location_id:
+            return validation_error_response("location_id is required")
+
+        # Get session and verify ownership
+        session_service = get_session_service()
+        session = session_service.get_session(session_id, user.id)
+
+        # Get character and verify location is discovered
+        character_service = get_character_service()
+        character = character_service.get_character(session.solo_character_id, user.id)
+
+        if location_id not in character.discovered_locations:
+            logger.warning("Attempted travel to undiscovered location",
+                          user_id=user.id,
+                          character_id=character.character_id,
+                          location_id=location_id)
+            return error_response("Location not discovered", 403)
+
+        # Load location details
+        location_loader = get_location_loader()
+        location = location_loader.load_location(location_id)
+
+        if not location:
+            logger.error("Location not found in data files",
+                        location_id=location_id)
+            return not_found_response("Location not found")
+
+        # Update session with new location
+        session = session_service.update_location(
+            session_id,
+            location_id,
+            location.location_type
+        )
+
+        # Get NPCs at new location
+        npc_loader = get_npc_loader()
+        npcs = npc_loader.get_npcs_at_location(location_id)
+
+        # Build NPC summary list
+        npcs_present = []
+        for npc in npcs:
+            npcs_present.append({
+                "npc_id": npc.npc_id,
+                "name": npc.name,
+                "role": npc.role,
+                "appearance": npc.appearance.brief,
+            })
+
+        logger.info("Character traveled to location",
+                   user_id=user.id,
+                   session_id=session_id,
+                   location_id=location_id)
+
+        return success_response({
+            "location": location.to_dict(),
+            "npcs_present": npcs_present,
+            "game_state": session.game_state.to_dict(),
+        })
+
+    except SessionNotFound:
+        return not_found_response("Session not found")
+    except CharacterNotFound:
+        return not_found_response("Character not found")
+    except Exception as e:
+        logger.error("Failed to travel to location",
+                    error=str(e))
+        return error_response("Failed to travel", 500)
+
+
+@travel_bp.route('/api/v1/travel/location/<location_id>', methods=['GET'])
+@require_auth
+def get_location_details(location_id: str):
+    """
+    Get details about a specific location.
+
+    Path params:
+        location_id: Location ID to get details for
+
+    Query params:
+        session_id: Active session ID (optional, for context)
+
+    Returns:
+        JSON response with location details and NPCs
+    """
+    try:
+        user = get_current_user()
+
+        # Load location
+        location_loader = get_location_loader()
+        location = location_loader.load_location(location_id)
+
+        if not location:
+            return not_found_response("Location not found")
+
+        # Get NPCs at location
+        npc_loader = get_npc_loader()
+        npcs = npc_loader.get_npcs_at_location(location_id)
+
+        npcs_present = []
+        for npc in npcs:
+            npcs_present.append({
+                "npc_id": npc.npc_id,
+                "name": npc.name,
+                "role": npc.role,
+                "appearance": npc.appearance.brief,
+            })
+
+        return success_response({
+            "location": location.to_dict(),
+            "npcs_present": npcs_present,
+        })
+
+    except Exception as e:
+        logger.error("Failed to get location details",
+                    location_id=location_id,
+                    error=str(e))
+        return error_response("Failed to get location", 500)
+
+
+@travel_bp.route('/api/v1/travel/current', methods=['GET'])
+@require_auth
+def get_current_location():
+    """
+    Get details about the current location in a session.
+
+    Query params:
+        session_id: Active session ID
+
+    Returns:
+        JSON response with current location details and NPCs
+    """
+    try:
+        user = get_current_user()
+        session_id = request.args.get('session_id')
+
+        if not session_id:
+            return validation_error_response("session_id query parameter is required")
+
+        # Get session
+        session_service = get_session_service()
+        session = session_service.get_session(session_id, user.id)
+
+        current_location_id = session.game_state.current_location
+
+        # Load location
+        location_loader = get_location_loader()
+        location = location_loader.load_location(current_location_id)
+
+        if not location:
+            # Location not in data files - return basic info from session
+            return success_response({
+                "location": {
+                    "location_id": current_location_id,
+                    "name": current_location_id,
+                    "location_type": session.game_state.location_type.value,
+                },
+                "npcs_present": [],
+            })
+
+        # Get NPCs at location
+        npc_loader = get_npc_loader()
+        npcs = npc_loader.get_npcs_at_location(current_location_id)
+
+        npcs_present = []
+        for npc in npcs:
+            npcs_present.append({
+                "npc_id": npc.npc_id,
+                "name": npc.name,
+                "role": npc.role,
+                "appearance": npc.appearance.brief,
+            })
+
+        return success_response({
+            "location": location.to_dict(),
+            "npcs_present": npcs_present,
+        })
+
+    except SessionNotFound:
+        return not_found_response("Session not found")
+    except Exception as e:
+        logger.error("Failed to get current location",
+                    error=str(e))
+        return error_response("Failed to get current location", 500)

api/app/config.py

@@ -0,0 +1,319 @@
+"""
+Configuration loader for Code of Conquest.
+
+Loads configuration from YAML files and environment variables,
+providing typed access to all configuration values.
+"""
+
+import os
+from dataclasses import dataclass, field
+from typing import Dict, List, Optional
+import yaml
+from dotenv import load_dotenv
+
+
+@dataclass
+class AppConfig:
+    """Application configuration."""
+    name: str
+    version: str
+    environment: str
+    debug: bool
+
+
+@dataclass
+class ServerConfig:
+    """Server configuration."""
+    host: str
+    port: int
+    workers: int
+
+
+@dataclass
+class RedisConfig:
+    """Redis configuration."""
+    host: str
+    port: int
+    db: int
+    max_connections: int
+
+    @property
+    def url(self) -> str:
+        """Generate Redis URL."""
+        return f"redis://{self.host}:{self.port}/{self.db}"
+
+
+@dataclass
+class RQConfig:
+    """RQ (Redis Queue) configuration."""
+    queues: List[str]
+    worker_timeout: int
+    job_timeout: int
+
+
+@dataclass
+class AIModelConfig:
+    """AI model configuration."""
+    provider: str
+    model: str
+    max_tokens: int
+    temperature: float
+
+
+@dataclass
+class AIConfig:
+    """AI service configuration."""
+    timeout: int
+    max_retries: int
+    cost_alert_threshold: float
+    models: Dict[str, AIModelConfig] = field(default_factory=dict)
+
+
+@dataclass
+class RateLimitTier:
+    """Rate limit configuration for a subscription tier."""
+    requests_per_minute: int
+    ai_calls_per_day: int
+    custom_actions_per_day: int  # -1 for unlimited
+    custom_action_char_limit: int
+
+
+@dataclass
+class RateLimitingConfig:
+    """Rate limiting configuration."""
+    enabled: bool
+    storage_url: str
+    tiers: Dict[str, RateLimitTier] = field(default_factory=dict)
+
+
+@dataclass
+class AuthConfig:
+    """Authentication configuration."""
+    cookie_name: str
+    duration_normal: int
+    duration_remember_me: int
+    http_only: bool
+    secure: bool
+    same_site: str
+    path: str
+    password_min_length: int
+    password_require_uppercase: bool
+    password_require_lowercase: bool
+    password_require_number: bool
+    password_require_special: bool
+    name_min_length: int
+    name_max_length: int
+    email_max_length: int
+
+
+@dataclass
+class SessionConfig:
+    """Game session configuration."""
+    timeout_minutes: int
+    auto_save_interval: int
+    min_players: int
+    max_players_by_tier: Dict[str, int] = field(default_factory=dict)
+
+
+@dataclass
+class MarketplaceConfig:
+    """Marketplace configuration."""
+    auction_check_interval: int
+    max_listings_by_tier: Dict[str, int] = field(default_factory=dict)
+
+
+@dataclass
+class CORSConfig:
+    """CORS configuration."""
+    origins: List[str]
+
+
+@dataclass
+class LoggingConfig:
+    """Logging configuration."""
+    level: str
+    format: str
+    handlers: List[str]
+    file_path: str
+
+
+@dataclass
+class Config:
+    """
+    Main configuration container.
+
+    Loads configuration from YAML file based on environment,
+    with overrides from environment variables.
+    """
+    app: AppConfig
+    server: ServerConfig
+    redis: RedisConfig
+    rq: RQConfig
+    ai: AIConfig
+    rate_limiting: RateLimitingConfig
+    auth: AuthConfig
+    session: SessionConfig
+    marketplace: MarketplaceConfig
+    cors: CORSConfig
+    logging: LoggingConfig
+
+    # Environment variables (loaded from .env)
+    secret_key: str = ""
+    appwrite_endpoint: str = ""
+    appwrite_project_id: str = ""
+    appwrite_api_key: str = ""
+    appwrite_database_id: str = ""
+    anthropic_api_key: str = ""
+    replicate_api_token: str = ""
+
+    @classmethod
+    def load(cls, environment: Optional[str] = None) -> 'Config':
+        """
+        Load configuration from YAML file and environment variables.
+
+        Args:
+            environment: Environment name (development, production, etc.).
+                        If not provided, uses FLASK_ENV from environment.
+
+        Returns:
+            Config: Loaded configuration object.
+
+        Raises:
+            FileNotFoundError: If config file not found.
+            ValueError: If required environment variables missing.
+        """
+        # Load environment variables from .env file
+        load_dotenv()
+
+        # Determine environment
+        if environment is None:
+            environment = os.getenv('FLASK_ENV', 'development')
+
+        # Load YAML configuration
+        config_path = os.path.join('config', f'{environment}.yaml')
+
+        if not os.path.exists(config_path):
+            raise FileNotFoundError(
+                f"Configuration file not found: {config_path}"
+            )
+
+        with open(config_path, 'r') as f:
+            config_data = yaml.safe_load(f)
+
+        # Parse configuration sections
+        app_config = AppConfig(**config_data['app'])
+        server_config = ServerConfig(**config_data['server'])
+        redis_config = RedisConfig(**config_data['redis'])
+        rq_config = RQConfig(**config_data['rq'])
+
+        # Parse AI models
+        ai_models = {}
+        for tier, model_data in config_data['ai']['models'].items():
+            ai_models[tier] = AIModelConfig(**model_data)
+
+        ai_config = AIConfig(
+            timeout=config_data['ai']['timeout'],
+            max_retries=config_data['ai']['max_retries'],
+            cost_alert_threshold=config_data['ai']['cost_alert_threshold'],
+            models=ai_models
+        )
+
+        # Parse rate limiting tiers
+        rate_limit_tiers = {}
+        for tier, tier_data in config_data['rate_limiting']['tiers'].items():
+            rate_limit_tiers[tier] = RateLimitTier(**tier_data)
+
+        rate_limiting_config = RateLimitingConfig(
+            enabled=config_data['rate_limiting']['enabled'],
+            storage_url=config_data['rate_limiting']['storage_url'],
+            tiers=rate_limit_tiers
+        )
+
+        auth_config = AuthConfig(**config_data['auth'])
+        session_config = SessionConfig(**config_data['session'])
+        marketplace_config = MarketplaceConfig(**config_data['marketplace'])
+        cors_config = CORSConfig(**config_data['cors'])
+        logging_config = LoggingConfig(**config_data['logging'])
+
+        # Load environment variables (secrets)
+        secret_key = os.getenv('SECRET_KEY')
+        if not secret_key:
+            raise ValueError("SECRET_KEY environment variable is required")
+
+        appwrite_endpoint = os.getenv('APPWRITE_ENDPOINT', '')
+        appwrite_project_id = os.getenv('APPWRITE_PROJECT_ID', '')
+        appwrite_api_key = os.getenv('APPWRITE_API_KEY', '')
+        appwrite_database_id = os.getenv('APPWRITE_DATABASE_ID', 'main')
+        anthropic_api_key = os.getenv('ANTHROPIC_API_KEY', '')
+        replicate_api_token = os.getenv('REPLICATE_API_TOKEN', '')
+
+        # Create and return config object
+        return cls(
+            app=app_config,
+            server=server_config,
+            redis=redis_config,
+            rq=rq_config,
+            ai=ai_config,
+            rate_limiting=rate_limiting_config,
+            auth=auth_config,
+            session=session_config,
+            marketplace=marketplace_config,
+            cors=cors_config,
+            logging=logging_config,
+            secret_key=secret_key,
+            appwrite_endpoint=appwrite_endpoint,
+            appwrite_project_id=appwrite_project_id,
+            appwrite_api_key=appwrite_api_key,
+            appwrite_database_id=appwrite_database_id,
+            anthropic_api_key=anthropic_api_key,
+            replicate_api_token=replicate_api_token
+        )
+
+    def validate(self) -> None:
+        """
+        Validate configuration values.
+
+        Raises:
+            ValueError: If configuration is invalid.
+        """
+        # Validate AI API keys if needed
+        if self.app.environment == 'production':
+            if not self.anthropic_api_key:
+                raise ValueError(
+                    "ANTHROPIC_API_KEY required in production environment"
+                )
+            if not self.appwrite_endpoint or not self.appwrite_project_id:
+                raise ValueError(
+                    "Appwrite configuration required in production environment"
+                )
+
+        # Validate logging level
+        valid_log_levels = ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']
+        if self.logging.level not in valid_log_levels:
+            raise ValueError(
+                f"Invalid log level: {self.logging.level}. "
+                f"Must be one of {valid_log_levels}"
+            )
+
+
+# Global config instance (loaded lazily)
+_config: Optional[Config] = None
+
+
+def get_config(environment: Optional[str] = None) -> Config:
+    """
+    Get the global configuration instance.
+
+    Args:
+        environment: Optional environment override.
+
+    Returns:
+        Config: Configuration object.
+    """
+    global _config
+
+    if _config is None or environment is not None:
+        _config = Config.load(environment)
+        _config.validate()
+
+    return _config

api/app/data/abilities/README.md

@@ -0,0 +1,141 @@
+# Ability Configuration Files
+
+This directory contains YAML configuration files that define all abilities in the game.
+
+## Format
+
+Each ability is defined in a separate `.yaml` file with the following structure:
+
+```yaml
+ability_id: "unique_identifier"
+name: "Display Name"
+description: "What the ability does"
+ability_type: "attack|spell|skill|item_use|defend"
+base_power: 0                    # Base damage or healing
+damage_type: "physical|fire|ice|lightning|holy|shadow|poison"
+scaling_stat: "strength|dexterity|constitution|intelligence|wisdom|charisma"
+scaling_factor: 0.5              # Multiplier for scaling stat
+mana_cost: 0                     # MP required to use
+cooldown: 0                      # Turns before can be used again
+is_aoe: false                    # Whether it affects multiple targets
+target_count: 1                  # Number of targets (0 = all enemies)
+effects_applied: []              # List of effects to apply on hit
+```
+
+## Effect Format
+
+Effects applied by abilities use this structure:
+
+```yaml
+effects_applied:
+  - effect_id: "unique_id"
+    name: "Effect Name"
+    effect_type: "buff|debuff|dot|hot|stun|shield"
+    duration: 3                  # Turns before expiration
+    power: 5                     # Damage/healing/modifier per turn
+    stat_affected: "strength"    # For buffs/debuffs only (null otherwise)
+    stacks: 1                    # Initial stack count
+    max_stacks: 5                # Maximum stacks allowed
+    source: "ability_id"         # Which ability applied this
+```
+
+## Effect Types
+
+| Type | Power Usage | Example |
+|------|-------------|---------|
+| `buff` | Stat modifier (×stacks) | +5 strength per stack |
+| `debuff` | Stat modifier (×stacks) | -3 defense per stack |
+| `dot` | Damage per turn (×stacks) | 5 poison damage per turn |
+| `hot` | Healing per turn (×stacks) | 8 HP regeneration per turn |
+| `stun` | Not used | Prevents actions for duration |
+| `shield` | Shield strength (×stacks) | 50 damage absorption |
+
+## Damage Calculation
+
+Abilities calculate their final power using this formula:
+
+```
+Final Power = base_power + (scaling_stat × scaling_factor)
+Minimum power is always 1
+```
+
+**Examples:**
+- Fireball with 30 base_power, INT scaling 0.5, caster has 16 INT:
+  - 30 + (16 × 0.5) = 38 power
+- Shield Bash with 10 base_power, STR scaling 0.5, caster has 20 STR:
+  - 10 + (20 × 0.5) = 20 power
+
+## Loading Abilities
+
+Abilities are loaded via the `AbilityLoader` class:
+
+```python
+from app.models.abilities import AbilityLoader
+
+loader = AbilityLoader()
+fireball = loader.load_ability("fireball")
+power = fireball.calculate_power(caster_stats)
+```
+
+## Example Abilities
+
+### basic_attack.yaml
+- Simple physical attack
+- No mana cost or cooldown
+- Available to all characters
+
+### fireball.yaml
+- Offensive spell
+- Deals fire damage + applies burning DoT
+- Costs 15 MP, no cooldown
+
+### shield_bash.yaml
+- Vanguard class skill
+- Deals damage + stuns for 1 turn
+- Costs 5 MP, 2 turn cooldown
+
+### heal.yaml
+- Luminary class spell
+- Restores health + applies regeneration HoT
+- Costs 10 MP, no cooldown
+
+## Creating New Abilities
+
+1. Create a new `.yaml` file in this directory
+2. Follow the format above
+3. Set appropriate values for your ability
+4. Ability will be automatically available via `AbilityLoader`
+5. No code changes required!
+
+## Guidelines
+
+**Power Scaling:**
+- Basic attacks: 5-10 base power
+- Spells: 20-40 base power
+- Skills: 10-25 base power
+- Scaling factor typically 0.5 (50% of stat)
+
+**Mana Costs:**
+- Basic attacks: 0 MP
+- Low-tier spells: 5-10 MP
+- Mid-tier spells: 15-20 MP
+- High-tier spells: 25-30 MP
+- Ultimate abilities: 40-50 MP
+
+**Cooldowns:**
+- No cooldown (0): Most spells and basic attacks
+- Short (1-2 turns): Common skills
+- Medium (3-5 turns): Powerful skills
+- Long (5-10 turns): Ultimate abilities
+
+**Effect Duration:**
+- Instant effects (stun): 1 turn
+- Short DoT/HoT: 2-3 turns
+- Long DoT/HoT: 4-5 turns
+- Buffs/debuffs: 2-4 turns
+
+**Effect Power:**
+- Weak DoT: 3-5 damage per turn
+- Medium DoT: 8-12 damage per turn
+- Strong DoT: 15-20 damage per turn
+- Stat modifiers: 3-10 points per stack

api/app/data/abilities/basic_attack.yaml

@@ -0,0 +1,16 @@
+# Basic Attack - Default melee attack
+# Available to all characters, no mana cost, no cooldown
+
+ability_id: "basic_attack"
+name: "Basic Attack"
+description: "A standard melee attack with your equipped weapon"
+ability_type: "attack"
+base_power: 5
+damage_type: "physical"
+scaling_stat: "strength"
+scaling_factor: 0.5
+mana_cost: 0
+cooldown: 0
+is_aoe: false
+target_count: 1
+effects_applied: []

api/app/data/abilities/fireball.yaml

@@ -0,0 +1,25 @@
+# Fireball - Offensive spell for Arcanist class
+# Deals fire damage and applies burning DoT
+
+ability_id: "fireball"
+name: "Fireball"
+description: "Hurl a ball of fire at your enemies, dealing damage and burning them"
+ability_type: "spell"
+base_power: 30
+damage_type: "fire"
+scaling_stat: "intelligence"
+scaling_factor: 0.5
+mana_cost: 15
+cooldown: 0
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "burn"
+    name: "Burning"
+    effect_type: "dot"
+    duration: 3
+    power: 5
+    stat_affected: null
+    stacks: 1
+    max_stacks: 3
+    source: "fireball"

api/app/data/abilities/heal.yaml

@@ -0,0 +1,26 @@
+# Heal - Luminary class ability
+# Restores health to target ally
+
+ability_id: "heal"
+name: "Heal"
+description: "Channel divine energy to restore an ally's health"
+ability_type: "spell"
+base_power: 25
+damage_type: "holy"
+scaling_stat: "intelligence"
+scaling_factor: 0.5
+mana_cost: 10
+cooldown: 0
+is_aoe: false
+target_count: 1
+effects_applied:
+  # Healing is represented as negative DOT (HOT)
+  - effect_id: "regeneration"
+    name: "Regeneration"
+    effect_type: "hot"
+    duration: 2
+    power: 5
+    stat_affected: null
+    stacks: 1
+    max_stacks: 3
+    source: "heal"

api/app/data/abilities/shield_bash.yaml

@@ -0,0 +1,25 @@
+# Shield Bash - Vanguard class ability
+# Deals damage and stuns the target
+
+ability_id: "shield_bash"
+name: "Shield Bash"
+description: "Bash your enemy with your shield, dealing damage and stunning them briefly"
+ability_type: "skill"
+base_power: 10
+damage_type: "physical"
+scaling_stat: "strength"
+scaling_factor: 0.5
+mana_cost: 5
+cooldown: 2
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "stun"
+    name: "Stunned"
+    effect_type: "stun"
+    duration: 1
+    power: 0
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "shield_bash"

api/app/data/action_prompts.yaml

@@ -0,0 +1,295 @@
+# Action Prompts Configuration
+#
+# Defines the predefined actions available to players during story progression.
+# Actions are filtered by user tier and location type.
+#
+# Tier hierarchy: FREE < BASIC < PREMIUM < ELITE
+# Location types: town, tavern, wilderness, dungeon, safe_area, library, any
+
+action_prompts:
+  # =============================================================================
+  # FREE TIER ACTIONS (4)
+  # Available to all players
+  # =============================================================================
+
+  - prompt_id: ask_locals
+    category: ask_question
+    display_text: Ask locals for information
+    description: Talk to NPCs to learn about quests, rumors, and local lore
+    tier_required: free
+    context_filter: [town, tavern]
+    icon: chat
+    cooldown_turns: 0
+    dm_prompt_template: |
+      The player approaches locals in {{ game_state.current_location }} and asks for information.
+
+      Character: {{ character.name }}, Level {{ character.level }} {{ character.player_class }}
+
+      Generate realistic NPC dialogue where locals share:
+      - Local rumors or gossip
+      - Information about nearby points of interest
+      - Hints about potential quests or dangers
+      - Useful tips for adventurers
+
+      The NPCs should have distinct personalities and speak naturally. Include 1-2 NPCs in the response.
+      End with a hook that encourages further exploration or action.
+
+  - prompt_id: explore_area
+    category: explore
+    display_text: Explore the area
+    description: Search your surroundings for points of interest, hidden paths, or useful items
+    tier_required: free
+    context_filter: [wilderness, dungeon]
+    icon: compass
+    cooldown_turns: 0
+    dm_prompt_template: |
+      The player explores the area around {{ game_state.current_location }}.
+
+      Character: {{ character.name }}, Level {{ character.level }} {{ character.player_class }}
+      Perception modifier: {{ character.stats.wisdom | default(10) }}
+
+      Describe what the player discovers:
+      - Environmental details and atmosphere
+      - Points of interest (paths, structures, natural features)
+      - Any items, tracks, or clues found
+      - Potential dangers or opportunities
+
+      Based on their Wisdom score, they may notice hidden details.
+
+      IMPORTANT: Do NOT automatically move the player to a new location.
+      Present 2-3 options of what they can investigate or where they can go.
+      Ask: "What would you like to investigate?" or "Which path do you take?"
+
+  - prompt_id: search_supplies
+    category: gather_info
+    display_text: Search for supplies
+    description: Look for useful items, herbs, or materials in the environment
+    tier_required: free
+    context_filter: [any]
+    icon: search
+    cooldown_turns: 2
+    requires_check:
+      check_type: search
+      difficulty: medium
+    dm_prompt_template: |
+      The player searches for supplies in {{ game_state.current_location }}.
+
+      Character: {{ character.name }}, Level {{ character.level }} {{ character.player_class }}
+
+      {% if check_outcome %}
+      DICE CHECK RESULT: {{ check_outcome.check_result.success | string | upper }}
+      - Roll: {{ check_outcome.check_result.roll }} + {{ check_outcome.check_result.modifier }} = {{ check_outcome.check_result.total }} vs DC {{ check_outcome.check_result.dc }}
+      {% if check_outcome.check_result.success %}
+      - Items found: {% for item in check_outcome.items_found %}{{ item.name }}{% if not loop.last %}, {% endif %}{% endfor %}
+      - Gold found: {{ check_outcome.gold_found }}
+
+      The player SUCCEEDED in their search. Narrate how they found these specific items.
+      The items will be automatically added to their inventory - describe the discovery.
+      {% else %}
+      The player FAILED their search. Narrate the unsuccessful search attempt.
+      They find nothing of value this time. Describe what they checked but came up empty.
+      {% endif %}
+      {% else %}
+      Describe what supply sources or items they find based on location.
+      {% endif %}
+
+      Keep the narration immersive and match the location type.
+
+  - prompt_id: rest_recover
+    category: rest
+    display_text: Rest and recover
+    description: Take a short rest to recover health and stamina in a safe location
+    tier_required: free
+    context_filter: [town, tavern, safe_area]
+    icon: bed
+    cooldown_turns: 3
+    dm_prompt_template: |
+      The player wants to rest in {{ game_state.current_location }}.
+
+      Character: {{ character.name }}, Level {{ character.level }} {{ character.player_class }}
+      Current HP: {{ character.current_hp }}/{{ character.max_hp }}
+
+      For PAID rest (taverns/inns):
+      - Describe the establishment and available rooms WITH PRICES
+      - Ask which option they want before resting
+      - DO NOT automatically spend their gold
+
+      For FREE rest (safe areas, campsites):
+      - Describe finding a suitable spot
+      - Describe the rest atmosphere and any ambient details
+      - Dreams, thoughts, or reflections the character has
+
+      After they choose to rest:
+      - The player recovers some health and feels refreshed
+      - End with them ready to continue their adventure
+
+  # =============================================================================
+  # PREMIUM TIER ACTIONS (+3)
+  # Available to Premium and Elite subscribers
+  # =============================================================================
+
+  - prompt_id: investigate_suspicious
+    category: gather_info
+    display_text: Investigate suspicious activity
+    description: Look deeper into something that seems out of place or dangerous
+    tier_required: premium
+    context_filter: [any]
+    icon: magnifying_glass
+    cooldown_turns: 0
+    dm_prompt_template: |
+      The player investigates suspicious activity in {{ game_state.current_location }}.
+
+      Character: {{ character.name }}, Level {{ character.level }} {{ character.player_class }}
+      Intelligence: {{ character.stats.intelligence | default(10) }}
+
+      Based on the location and recent events, describe:
+      - What draws their attention
+      - Clues or evidence they discover
+      - Connections to larger mysteries or threats
+      - Potential leads to follow
+
+      Higher Intelligence reveals more detailed observations.
+      This should advance the story or reveal hidden plot elements.
+      End with a clear lead or decision point.
+
+  - prompt_id: follow_lead
+    category: travel
+    display_text: Follow a lead
+    description: Pursue information or tracks that could lead to your goal
+    tier_required: premium
+    context_filter: [any]
+    icon: footprints
+    cooldown_turns: 0
+    dm_prompt_template: |
+      The player follows a lead from {{ game_state.current_location }}.
+
+      Character: {{ character.name }}, Level {{ character.level }} {{ character.player_class }}
+
+      Based on recent discoveries or conversations, describe:
+      - What lead they're following (information, tracks, rumors)
+      - The journey or investigation process
+      - What they find at the end of the trail
+      - New information or locations discovered
+
+      This should move the story forward significantly.
+      May lead to new areas, NPCs, or quest opportunities.
+      End with a meaningful discovery or encounter.
+
+  - prompt_id: make_camp
+    category: rest
+    display_text: Make camp
+    description: Set up a campsite in the wilderness for rest and preparation
+    tier_required: premium
+    context_filter: [wilderness]
+    icon: campfire
+    cooldown_turns: 5
+    dm_prompt_template: |
+      The player sets up camp in {{ game_state.current_location }}.
+
+      Character: {{ character.name }}, Level {{ character.level }} {{ character.player_class }}
+      Survival skill: {{ character.stats.wisdom | default(10) }}
+
+      Describe the camping experience:
+      - Finding a suitable spot and setting up
+      - Building a fire, preparing food
+      - The night watch and any nocturnal events
+      - Dreams or visions during sleep
+
+      Higher Wisdom means better campsite selection and awareness.
+      May include random encounters (friendly travelers, animals, or threats).
+      Player recovers health and is ready for the next day.
+
+  # =============================================================================
+  # ELITE TIER ACTIONS (+3)
+  # Available only to Elite subscribers
+  # =============================================================================
+
+  - prompt_id: consult_texts
+    category: special
+    display_text: Consult ancient texts
+    description: Study rare manuscripts and tomes for hidden knowledge and lore
+    tier_required: elite
+    context_filter: [library, town]
+    icon: book
+    cooldown_turns: 3
+    dm_prompt_template: |
+      The player consults ancient texts in {{ game_state.current_location }}.
+
+      Character: {{ character.name }}, Level {{ character.level }} {{ character.player_class }}
+      Intelligence: {{ character.stats.intelligence | default(10) }}
+
+      Describe the research session:
+      - The library or collection they access
+      - Specific tomes or scrolls they study
+      - Ancient knowledge they uncover
+      - Connections to current quests or mysteries
+
+      Higher Intelligence allows deeper understanding.
+      May reveal:
+      - Monster weaknesses or strategies
+      - Hidden location details
+      - Historical context for current events
+      - Magical item properties or crafting recipes
+
+      End with actionable knowledge that helps their quest.
+
+  - prompt_id: commune_nature
+    category: special
+    display_text: Commune with nature
+    description: Attune to the natural world to gain insights and guidance
+    tier_required: elite
+    context_filter: [wilderness]
+    icon: leaf
+    cooldown_turns: 4
+    dm_prompt_template: |
+      The player communes with nature in {{ game_state.current_location }}.
+
+      Character: {{ character.name }}, Level {{ character.level }} {{ character.player_class }}
+      Wisdom: {{ character.stats.wisdom | default(10) }}
+
+      Describe the mystical experience:
+      - The ritual or meditation performed
+      - Visions, sounds, or sensations received
+      - Messages from the natural world
+      - Animal messengers or nature spirits encountered
+
+      Higher Wisdom provides clearer visions.
+      May reveal:
+      - Danger ahead or safe paths
+      - Weather changes or natural disasters
+      - Animal behavior patterns
+      - Locations of rare herbs or resources
+      - Environmental quest hints
+
+      End with prophetic or practical guidance.
+
+  - prompt_id: seek_audience
+    category: special
+    display_text: Seek audience with authorities
+    description: Request a meeting with local leaders, nobles, or officials
+    tier_required: elite
+    context_filter: [town]
+    icon: crown
+    cooldown_turns: 5
+    dm_prompt_template: |
+      The player seeks an audience with authorities in {{ game_state.current_location }}.
+
+      Character: {{ character.name }}, Level {{ character.level }} {{ character.player_class }}
+      Charisma: {{ character.stats.charisma | default(10) }}
+      Reputation: {{ character.reputation | default('unknown') }}
+
+      Describe the audience:
+      - The authority figure (mayor, lord, guild master, etc.)
+      - The setting and formality of the meeting
+      - The conversation and requests made
+      - The authority's response and any tasks given
+
+      Higher Charisma and reputation improve reception.
+      May result in:
+      - Official quests with better rewards
+      - Access to restricted areas
+      - Political information or alliances
+      - Resources or equipment grants
+      - Letters of introduction
+
+      End with a clear outcome and next steps.

api/app/data/classes/arcanist.yaml

@@ -0,0 +1,264 @@
+# Arcanist - Magic Burst
+# Flexible hybrid class: Choose Pyromancy (fire AoE) or Cryomancy (ice control)
+
+class_id: arcanist
+name: Arcanist
+description: >
+  A master of elemental magic who bends the forces of fire and ice to their will. Arcanists
+  excel in devastating spell damage, capable of incinerating groups of foes or freezing
+  enemies in place. Choose your element: embrace the flames or command the frost.
+
+# Base stats (total: 65)
+base_stats:
+  strength: 8       # Low physical power
+  dexterity: 10     # Average agility
+  constitution: 9   # Below average endurance
+  intelligence: 15  # Exceptional magical power
+  wisdom: 12        # Above average perception
+  charisma: 11      # Above average social
+
+starting_equipment:
+  - worn_staff
+  - cloth_armor
+  - rusty_knife
+
+starting_abilities:
+  - basic_attack
+
+skill_trees:
+  # ==================== PYROMANCY (Fire AoE) ====================
+  - tree_id: pyromancy
+    name: Pyromancy
+    description: >
+      The path of flame. Master destructive fire magic to incinerate your enemies
+      with overwhelming area damage and burning DoTs.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: fireball
+        name: Fireball
+        description: Hurl a ball of flame at an enemy, dealing fire damage and igniting them.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - fireball
+
+      - skill_id: flame_attunement
+        name: Flame Attunement
+        description: Your affinity with fire magic increases your magical power.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            intelligence: 5
+
+      # --- TIER 2 ---
+      - skill_id: flame_burst
+        name: Flame Burst
+        description: Release a burst of fire around you, damaging all nearby enemies.
+        tier: 2
+        prerequisites:
+          - fireball
+        effects:
+          abilities:
+            - flame_burst
+
+      - skill_id: burning_soul
+        name: Burning Soul
+        description: Your inner fire burns brighter, increasing fire damage.
+        tier: 2
+        prerequisites:
+          - flame_attunement
+        effects:
+          stat_bonuses:
+            intelligence: 5
+          combat_bonuses:
+            fire_damage_bonus: 0.15  # +15% fire damage
+
+      # --- TIER 3 ---
+      - skill_id: inferno
+        name: Inferno
+        description: Summon a raging inferno that burns all enemies for 3 turns.
+        tier: 3
+        prerequisites:
+          - flame_burst
+        effects:
+          abilities:
+            - inferno
+
+      - skill_id: combustion
+        name: Combustion
+        description: Your fire spells can cause targets to explode on death, damaging nearby enemies.
+        tier: 3
+        prerequisites:
+          - burning_soul
+        effects:
+          passive_effects:
+            - burning_enemies_explode_on_death
+
+      # --- TIER 4 ---
+      - skill_id: firestorm
+        name: Firestorm
+        description: Call down a storm of meteors on all enemies, dealing massive fire damage.
+        tier: 4
+        prerequisites:
+          - inferno
+        effects:
+          abilities:
+            - firestorm
+
+      - skill_id: pyroclasm
+        name: Pyroclasm
+        description: Your mastery of flame makes all fire spells more devastating.
+        tier: 4
+        prerequisites:
+          - combustion
+        effects:
+          stat_bonuses:
+            intelligence: 10
+          combat_bonuses:
+            fire_damage_bonus: 0.25  # Additional +25% fire damage
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: sun_burst
+        name: Sun Burst
+        description: Channel the power of the sun itself, dealing catastrophic fire damage to all enemies.
+        tier: 5
+        prerequisites:
+          - firestorm
+        effects:
+          abilities:
+            - sun_burst
+
+      - skill_id: master_of_flame
+        name: Master of Flame
+        description: You are flame incarnate. Incredible fire magic bonuses.
+        tier: 5
+        prerequisites:
+          - pyroclasm
+        effects:
+          stat_bonuses:
+            intelligence: 20
+          combat_bonuses:
+            fire_damage_bonus: 0.50  # Additional +50% fire damage
+
+  # ==================== CRYOMANCY (Ice Control) ====================
+  - tree_id: cryomancy
+    name: Cryomancy
+    description: >
+      The path of frost. Master ice magic to freeze and slow enemies,
+      controlling the battlefield with chilling precision.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: ice_shard
+        name: Ice Shard
+        description: Launch a shard of ice at an enemy, dealing damage and slowing them.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - ice_shard
+
+      - skill_id: frost_attunement
+        name: Frost Attunement
+        description: Your affinity with ice magic increases your magical power.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            intelligence: 5
+
+      # --- TIER 2 ---
+      - skill_id: frozen_orb
+        name: Frozen Orb
+        description: Summon an orb of ice that explodes, freezing enemies in place for 1 turn.
+        tier: 2
+        prerequisites:
+          - ice_shard
+        effects:
+          abilities:
+            - frozen_orb
+
+      - skill_id: cold_embrace
+        name: Cold Embrace
+        description: The cold empowers you, increasing ice damage and mana.
+        tier: 2
+        prerequisites:
+          - frost_attunement
+        effects:
+          stat_bonuses:
+            intelligence: 5
+          combat_bonuses:
+            ice_damage_bonus: 0.15  # +15% ice damage
+
+      # --- TIER 3 ---
+      - skill_id: blizzard
+        name: Blizzard
+        description: Summon a raging blizzard that damages and slows all enemies.
+        tier: 3
+        prerequisites:
+          - frozen_orb
+        effects:
+          abilities:
+            - blizzard
+
+      - skill_id: permafrost
+        name: Permafrost
+        description: Your ice magic becomes more potent, with longer freeze durations.
+        tier: 3
+        prerequisites:
+          - cold_embrace
+        effects:
+          stat_bonuses:
+            wisdom: 5
+          combat_bonuses:
+            freeze_duration_bonus: 1  # +1 turn to freeze effects
+
+      # --- TIER 4 ---
+      - skill_id: glacial_spike
+        name: Glacial Spike
+        description: Impale an enemy with a massive ice spike, dealing heavy damage and freezing them.
+        tier: 4
+        prerequisites:
+          - blizzard
+        effects:
+          abilities:
+            - glacial_spike
+
+      - skill_id: ice_mastery
+        name: Ice Mastery
+        description: Your command of ice magic reaches new heights.
+        tier: 4
+        prerequisites:
+          - permafrost
+        effects:
+          stat_bonuses:
+            intelligence: 10
+          combat_bonuses:
+            ice_damage_bonus: 0.25  # Additional +25% ice damage
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: absolute_zero
+        name: Absolute Zero
+        description: Freeze all enemies solid for 2 turns while dealing massive damage over time.
+        tier: 5
+        prerequisites:
+          - glacial_spike
+        effects:
+          abilities:
+            - absolute_zero
+
+      - skill_id: winter_incarnate
+        name: Winter Incarnate
+        description: You become the embodiment of winter itself. Incredible ice magic bonuses.
+        tier: 5
+        prerequisites:
+          - ice_mastery
+        effects:
+          stat_bonuses:
+            intelligence: 20
+            wisdom: 10
+          combat_bonuses:
+            ice_damage_bonus: 0.50  # Additional +50% ice damage

api/app/data/classes/assassin.yaml

@@ -0,0 +1,265 @@
+# Assassin - Critical/Stealth
+# Flexible hybrid class: Choose Shadow Dancer (stealth/evasion) or Blade Specialist (critical damage)
+
+class_id: assassin
+name: Assassin
+description: >
+  A deadly operative who strikes from the shadows. Assassins excel in precise, devastating attacks,
+  capable of becoming an elusive phantom or a master of critical strikes. Choose your path: embrace
+  the shadows or perfect the killing blow.
+
+# Base stats (total: 65)
+base_stats:
+  strength: 11      # Above average physical power
+  dexterity: 15     # Exceptional agility
+  constitution: 10  # Average endurance
+  intelligence: 9   # Below average magic
+  wisdom: 10        # Average perception
+  charisma: 10      # Average social
+
+starting_equipment:
+  - rusty_dagger
+  - cloth_armor
+  - rusty_knife
+
+starting_abilities:
+  - basic_attack
+
+skill_trees:
+  # ==================== SHADOW DANCER (Stealth/Evasion) ====================
+  - tree_id: shadow_dancer
+    name: Shadow Dancer
+    description: >
+      The path of the phantom. Master stealth and evasion to become untouchable,
+      striking from darkness and vanishing before retaliation.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: shadowstep
+        name: Shadowstep
+        description: Teleport behind an enemy and strike, dealing bonus damage from behind.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - shadowstep
+
+      - skill_id: nimble
+        name: Nimble
+        description: Your natural agility is enhanced through training.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            dexterity: 5
+
+      # --- TIER 2 ---
+      - skill_id: smoke_bomb
+        name: Smoke Bomb
+        description: Throw a smoke bomb, becoming untargetable for 1 turn and gaining evasion bonus.
+        tier: 2
+        prerequisites:
+          - shadowstep
+        effects:
+          abilities:
+            - smoke_bomb
+
+      - skill_id: evasion_training
+        name: Evasion Training
+        description: Learn to anticipate and dodge incoming attacks.
+        tier: 2
+        prerequisites:
+          - nimble
+        effects:
+          combat_bonuses:
+            evasion_chance: 0.15  # +15% chance to evade attacks
+
+      # --- TIER 3 ---
+      - skill_id: vanish
+        name: Vanish
+        description: Disappear from the battlefield for 2 turns, removing all threat and repositioning.
+        tier: 3
+        prerequisites:
+          - smoke_bomb
+        effects:
+          abilities:
+            - vanish
+
+      - skill_id: shadow_form
+        name: Shadow Form
+        description: Your body becomes harder to hit, permanently increasing evasion.
+        tier: 3
+        prerequisites:
+          - evasion_training
+        effects:
+          combat_bonuses:
+            evasion_chance: 0.10  # Additional +10% evasion
+          stat_bonuses:
+            dexterity: 5
+
+      # --- TIER 4 ---
+      - skill_id: death_mark
+        name: Death Mark
+        description: Mark an enemy from stealth. Your next attack on them deals 200% damage.
+        tier: 4
+        prerequisites:
+          - vanish
+        effects:
+          abilities:
+            - death_mark
+
+      - skill_id: untouchable
+        name: Untouchable
+        description: Your mastery of evasion makes you extremely difficult to hit.
+        tier: 4
+        prerequisites:
+          - shadow_form
+        effects:
+          combat_bonuses:
+            evasion_chance: 0.15  # Additional +15% evasion
+          stat_bonuses:
+            dexterity: 10
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: shadow_assault
+        name: Shadow Assault
+        description: Strike all enemies in rapid succession from the shadows, guaranteed critical hits.
+        tier: 5
+        prerequisites:
+          - death_mark
+        effects:
+          abilities:
+            - shadow_assault
+
+      - skill_id: ghost
+        name: Ghost
+        description: Become one with the shadows. Massive evasion and dexterity bonuses.
+        tier: 5
+        prerequisites:
+          - untouchable
+        effects:
+          combat_bonuses:
+            evasion_chance: 0.20  # Additional +20% evasion (total can reach ~60%)
+          stat_bonuses:
+            dexterity: 15
+
+  # ==================== BLADE SPECIALIST (Critical Damage) ====================
+  - tree_id: blade_specialist
+    name: Blade Specialist
+    description: >
+      The path of precision. Master the art of the killing blow to deliver devastating
+      critical strikes that end fights in seconds.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: precise_strike
+        name: Precise Strike
+        description: A carefully aimed attack with increased critical hit chance.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - precise_strike
+
+      - skill_id: keen_edge
+        name: Keen Edge
+        description: Sharpen your weapons to a razor edge, increasing critical chance.
+        tier: 1
+        prerequisites: []
+        effects:
+          combat_bonuses:
+            crit_chance: 0.10  # +10% base crit
+
+      # --- TIER 2 ---
+      - skill_id: vital_strike
+        name: Vital Strike
+        description: Target vital points to deal massive critical damage.
+        tier: 2
+        prerequisites:
+          - precise_strike
+        effects:
+          abilities:
+            - vital_strike
+
+      - skill_id: deadly_precision
+        name: Deadly Precision
+        description: Your strikes become even more lethal.
+        tier: 2
+        prerequisites:
+          - keen_edge
+        effects:
+          combat_bonuses:
+            crit_chance: 0.10  # Additional +10% crit
+            crit_multiplier: 0.3  # +0.3 to crit multiplier
+
+      # --- TIER 3 ---
+      - skill_id: hemorrhage
+        name: Hemorrhage
+        description: Critical hits cause bleeding for 3 turns, dealing heavy damage over time.
+        tier: 3
+        prerequisites:
+          - vital_strike
+        effects:
+          passive_effects:
+            - crit_applies_bleed
+
+      - skill_id: surgical_strikes
+        name: Surgical Strikes
+        description: Every attack is a calculated execution.
+        tier: 3
+        prerequisites:
+          - deadly_precision
+        effects:
+          combat_bonuses:
+            crit_chance: 0.15  # Additional +15% crit
+          stat_bonuses:
+            dexterity: 5
+
+      # --- TIER 4 ---
+      - skill_id: coup_de_grace
+        name: Coup de Grace
+        description: Execute targets below 25% HP instantly with a guaranteed critical.
+        tier: 4
+        prerequisites:
+          - hemorrhage
+        effects:
+          abilities:
+            - coup_de_grace
+
+      - skill_id: master_assassin
+        name: Master Assassin
+        description: Your expertise with blades reaches perfection.
+        tier: 4
+        prerequisites:
+          - surgical_strikes
+        effects:
+          combat_bonuses:
+            crit_chance: 0.10  # Additional +10% crit
+            crit_multiplier: 0.5  # +0.5 to crit multiplier
+          stat_bonuses:
+            strength: 5
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: thousand_cuts
+        name: Thousand Cuts
+        description: Unleash a flurry of blade strikes on a single target, each hit has 50% crit chance.
+        tier: 5
+        prerequisites:
+          - coup_de_grace
+        effects:
+          abilities:
+            - thousand_cuts
+
+      - skill_id: perfect_assassination
+        name: Perfect Assassination
+        description: Your mastery of the blade is unmatched. Incredible critical bonuses.
+        tier: 5
+        prerequisites:
+          - master_assassin
+        effects:
+          combat_bonuses:
+            crit_chance: 0.20  # Additional +20% crit (total can reach ~75%)
+            crit_multiplier: 1.0  # +1.0 to crit multiplier
+          stat_bonuses:
+            dexterity: 10
+            strength: 10

api/app/data/classes/lorekeeper.yaml

@@ -0,0 +1,273 @@
+# Lorekeeper - Support/Control
+# Flexible hybrid class: Choose Arcane Weaving (buffs/debuffs) or Illusionist (crowd control)
+
+class_id: lorekeeper
+name: Lorekeeper
+description: >
+  A master of arcane knowledge who manipulates reality through words and illusions. Lorekeepers
+  excel in supporting allies and controlling enemies through clever magic and mental manipulation.
+  Choose your art: weave arcane power or bend reality itself.
+
+# Base stats (total: 67)
+base_stats:
+  strength: 8       # Low physical power
+  dexterity: 11     # Above average agility
+  constitution: 10  # Average endurance
+  intelligence: 13  # Above average magical power
+  wisdom: 11        # Above average perception
+  charisma: 14      # High social/performance
+
+starting_equipment:
+  - tome
+  - cloth_armor
+  - rusty_knife
+
+starting_abilities:
+  - basic_attack
+
+skill_trees:
+  # ==================== ARCANE WEAVING (Buffs/Debuffs) ====================
+  - tree_id: arcane_weaving
+    name: Arcane Weaving
+    description: >
+      The path of the arcane weaver. Master supportive magic to enhance allies,
+      weaken enemies, and turn the tide of battle through clever enchantments.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: arcane_brilliance
+        name: Arcane Brilliance
+        description: Grant an ally increased intelligence and magical power for 5 turns.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - arcane_brilliance
+
+      - skill_id: scholarly_mind
+        name: Scholarly Mind
+        description: Your extensive study enhances your magical knowledge.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            intelligence: 5
+
+      # --- TIER 2 ---
+      - skill_id: haste
+        name: Haste
+        description: Speed up an ally, granting them an extra action this turn.
+        tier: 2
+        prerequisites:
+          - arcane_brilliance
+        effects:
+          abilities:
+            - haste
+
+      - skill_id: arcane_mastery
+        name: Arcane Mastery
+        description: Your mastery of arcane arts increases all buff effectiveness.
+        tier: 2
+        prerequisites:
+          - scholarly_mind
+        effects:
+          stat_bonuses:
+            intelligence: 5
+            charisma: 3
+          combat_bonuses:
+            buff_power: 0.20  # +20% buff effectiveness
+
+      # --- TIER 3 ---
+      - skill_id: mass_enhancement
+        name: Mass Enhancement
+        description: Enhance all allies at once, increasing their stats for 5 turns.
+        tier: 3
+        prerequisites:
+          - haste
+        effects:
+          abilities:
+            - mass_enhancement
+
+      - skill_id: arcane_weakness
+        name: Arcane Weakness
+        description: Curse an enemy with weakness, reducing their stats and damage.
+        tier: 3
+        prerequisites:
+          - arcane_mastery
+        effects:
+          abilities:
+            - arcane_weakness
+
+      # --- TIER 4 ---
+      - skill_id: time_warp
+        name: Time Warp
+        description: Manipulate time itself, granting all allies bonus actions.
+        tier: 4
+        prerequisites:
+          - mass_enhancement
+        effects:
+          abilities:
+            - time_warp
+
+      - skill_id: master_weaver
+        name: Master Weaver
+        description: Your weaving expertise makes all enchantments far more potent.
+        tier: 4
+        prerequisites:
+          - arcane_weakness
+        effects:
+          stat_bonuses:
+            intelligence: 15
+            charisma: 10
+          combat_bonuses:
+            buff_power: 0.35  # Additional +35% buff effectiveness
+            debuff_power: 0.35  # +35% debuff effectiveness
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: reality_shift
+        name: Reality Shift
+        description: Shift reality to massively empower all allies and weaken all enemies.
+        tier: 5
+        prerequisites:
+          - time_warp
+        effects:
+          abilities:
+            - reality_shift
+
+      - skill_id: archmage
+        name: Archmage
+        description: Achieve the rank of archmage. Incredible support magic bonuses.
+        tier: 5
+        prerequisites:
+          - master_weaver
+        effects:
+          stat_bonuses:
+            intelligence: 25
+            charisma: 20
+            wisdom: 10
+          combat_bonuses:
+            buff_power: 0.75  # Additional +75% buff effectiveness
+            debuff_power: 0.75  # Additional +75% debuff effectiveness
+
+  # ==================== ILLUSIONIST (Crowd Control) ====================
+  - tree_id: illusionist
+    name: Illusionist
+    description: >
+      The path of deception. Master illusion magic to confuse, disorient, and control
+      the minds of your enemies, rendering them helpless.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: confuse
+        name: Confuse
+        description: Confuse an enemy's mind, causing them to attack randomly for 2 turns.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - confuse
+
+      - skill_id: silver_tongue
+        name: Silver Tongue
+        description: Your persuasive abilities make mind magic more effective.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            charisma: 5
+
+      # --- TIER 2 ---
+      - skill_id: mesmerize
+        name: Mesmerize
+        description: Mesmerize an enemy, stunning them for 2 turns.
+        tier: 2
+        prerequisites:
+          - confuse
+        effects:
+          abilities:
+            - mesmerize
+
+      - skill_id: mental_fortress
+        name: Mental Fortress
+        description: Fortify your mind and those of your allies against mental attacks.
+        tier: 2
+        prerequisites:
+          - silver_tongue
+        effects:
+          stat_bonuses:
+            wisdom: 5
+          combat_bonuses:
+            mental_resistance: 0.25  # +25% resistance to mind effects
+
+      # --- TIER 3 ---
+      - skill_id: mass_confusion
+        name: Mass Confusion
+        description: Confuse all enemies, causing chaos on the battlefield.
+        tier: 3
+        prerequisites:
+          - mesmerize
+        effects:
+          abilities:
+            - mass_confusion
+
+      - skill_id: mirror_image
+        name: Mirror Image
+        description: Create illusory copies of yourself that absorb attacks.
+        tier: 3
+        prerequisites:
+          - mental_fortress
+        effects:
+          abilities:
+            - mirror_image
+
+      # --- TIER 4 ---
+      - skill_id: phantasmal_killer
+        name: Phantasmal Killer
+        description: Create a terrifying illusion that deals massive psychic damage and fears enemies.
+        tier: 4
+        prerequisites:
+          - mass_confusion
+        effects:
+          abilities:
+            - phantasmal_killer
+
+      - skill_id: master_illusionist
+        name: Master Illusionist
+        description: Your illusions become nearly indistinguishable from reality.
+        tier: 4
+        prerequisites:
+          - mirror_image
+        effects:
+          stat_bonuses:
+            charisma: 15
+            intelligence: 10
+          combat_bonuses:
+            illusion_duration: 2  # +2 turns to illusion effects
+            cc_effectiveness: 0.35  # +35% crowd control effectiveness
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: mass_domination
+        name: Mass Domination
+        description: Dominate the minds of all enemies, forcing them to fight for you briefly.
+        tier: 5
+        prerequisites:
+          - phantasmal_killer
+        effects:
+          abilities:
+            - mass_domination
+
+      - skill_id: grand_illusionist
+        name: Grand Illusionist
+        description: Become a grand illusionist. Reality bends to your will.
+        tier: 5
+        prerequisites:
+          - master_illusionist
+        effects:
+          stat_bonuses:
+            charisma: 30
+            intelligence: 15
+            wisdom: 10
+          combat_bonuses:
+            illusion_duration: 5  # Additional +5 turns to illusions
+            cc_effectiveness: 0.75  # Additional +75% crowd control effectiveness
+            mental_damage_bonus: 1.0  # +100% psychic damage

api/app/data/classes/luminary.yaml

@@ -0,0 +1,266 @@
+# Luminary - Holy Healer/DPS
+# Flexible hybrid class: Choose Divine Protection (healing/shields) or Radiant Judgment (holy damage)
+
+class_id: luminary
+name: Luminary
+description: >
+  A blessed warrior who channels divine power. Luminaries excel in healing and protection,
+  capable of becoming a guardian angel for their allies or a righteous crusader smiting evil.
+  Choose your calling: protect the innocent or judge the wicked.
+
+# Base stats (total: 68)
+base_stats:
+  strength: 9       # Below average physical power
+  dexterity: 9      # Below average agility
+  constitution: 11  # Above average endurance
+  intelligence: 12  # Above average magical power
+  wisdom: 14        # High perception/divine power
+  charisma: 13      # Above average social
+
+starting_equipment:
+  - rusty_mace
+  - cloth_armor
+  - rusty_knife
+
+starting_abilities:
+  - basic_attack
+
+skill_trees:
+  # ==================== DIVINE PROTECTION (Healing/Shields) ====================
+  - tree_id: divine_protection
+    name: Divine Protection
+    description: >
+      The path of the guardian. Channel divine energy to heal wounds, shield allies,
+      and protect the vulnerable from harm.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: heal
+        name: Heal
+        description: Channel divine energy to restore an ally's health.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - heal
+
+      - skill_id: divine_grace
+        name: Divine Grace
+        description: Your connection to the divine enhances your wisdom and healing power.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            wisdom: 5
+
+      # --- TIER 2 ---
+      - skill_id: holy_shield
+        name: Holy Shield
+        description: Grant an ally a protective barrier that absorbs damage.
+        tier: 2
+        prerequisites:
+          - heal
+        effects:
+          abilities:
+            - holy_shield
+
+      - skill_id: blessed_aura
+        name: Blessed Aura
+        description: Emit an aura that passively regenerates nearby allies' health each turn.
+        tier: 2
+        prerequisites:
+          - divine_grace
+        effects:
+          passive_effects:
+            - aura_healing  # 5% max HP per turn to allies
+
+      # --- TIER 3 ---
+      - skill_id: mass_heal
+        name: Mass Heal
+        description: Channel divine power to heal all allies at once.
+        tier: 3
+        prerequisites:
+          - holy_shield
+        effects:
+          abilities:
+            - mass_heal
+
+      - skill_id: guardian_angel
+        name: Guardian Angel
+        description: Place a protective blessing on an ally that prevents their next death.
+        tier: 3
+        prerequisites:
+          - blessed_aura
+        effects:
+          abilities:
+            - guardian_angel
+
+      # --- TIER 4 ---
+      - skill_id: divine_intervention
+        name: Divine Intervention
+        description: Call upon divine power to fully heal an ally and remove all debuffs.
+        tier: 4
+        prerequisites:
+          - mass_heal
+        effects:
+          abilities:
+            - divine_intervention
+
+      - skill_id: sanctified
+        name: Sanctified
+        description: Your divine power reaches new heights, improving all healing.
+        tier: 4
+        prerequisites:
+          - guardian_angel
+        effects:
+          stat_bonuses:
+            wisdom: 10
+          combat_bonuses:
+            healing_power: 0.25  # +25% healing
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: resurrection
+        name: Resurrection
+        description: Bring a fallen ally back to life with 50% health and mana.
+        tier: 5
+        prerequisites:
+          - divine_intervention
+        effects:
+          abilities:
+            - resurrection
+
+      - skill_id: beacon_of_hope
+        name: Beacon of Hope
+        description: You radiate divine energy. Massive wisdom and healing bonuses.
+        tier: 5
+        prerequisites:
+          - sanctified
+        effects:
+          stat_bonuses:
+            wisdom: 20
+            charisma: 10
+          combat_bonuses:
+            healing_power: 0.50  # Additional +50% healing
+
+  # ==================== RADIANT JUDGMENT (Holy Damage) ====================
+  - tree_id: radiant_judgment
+    name: Radiant Judgment
+    description: >
+      The path of the crusader. Wield holy power as a weapon, smiting the wicked
+      with radiant damage and divine wrath.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: smite
+        name: Smite
+        description: Strike an enemy with holy power, dealing radiant damage.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - smite
+
+      - skill_id: righteous_fury
+        name: Righteous Fury
+        description: Your righteous anger fuels your holy power.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            wisdom: 5
+
+      # --- TIER 2 ---
+      - skill_id: holy_fire
+        name: Holy Fire
+        description: Burn an enemy with holy flames, dealing damage and reducing their healing received.
+        tier: 2
+        prerequisites:
+          - smite
+        effects:
+          abilities:
+            - holy_fire
+
+      - skill_id: zealot
+        name: Zealot
+        description: Your devotion to righteousness increases your damage against evil.
+        tier: 2
+        prerequisites:
+          - righteous_fury
+        effects:
+          stat_bonuses:
+            wisdom: 5
+            strength: 3
+          combat_bonuses:
+            holy_damage_bonus: 0.15  # +15% holy damage
+
+      # --- TIER 3 ---
+      - skill_id: consecration
+        name: Consecration
+        description: Consecrate the ground, dealing holy damage to enemies standing in it each turn.
+        tier: 3
+        prerequisites:
+          - holy_fire
+        effects:
+          abilities:
+            - consecration
+
+      - skill_id: divine_wrath
+        name: Divine Wrath
+        description: Channel pure divine fury into your attacks.
+        tier: 3
+        prerequisites:
+          - zealot
+        effects:
+          stat_bonuses:
+            wisdom: 10
+          combat_bonuses:
+            holy_damage_bonus: 0.20  # Additional +20% holy damage
+
+      # --- TIER 4 ---
+      - skill_id: hammer_of_justice
+        name: Hammer of Justice
+        description: Summon a massive holy hammer to crush your foes, stunning and damaging them.
+        tier: 4
+        prerequisites:
+          - consecration
+        effects:
+          abilities:
+            - hammer_of_justice
+
+      - skill_id: crusader
+        name: Crusader
+        description: You become a true crusader, dealing devastating holy damage.
+        tier: 4
+        prerequisites:
+          - divine_wrath
+        effects:
+          stat_bonuses:
+            wisdom: 10
+            strength: 5
+          combat_bonuses:
+            holy_damage_bonus: 0.25  # Additional +25% holy damage
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: divine_storm
+        name: Divine Storm
+        description: Unleash a catastrophic storm of holy energy, damaging and stunning all enemies.
+        tier: 5
+        prerequisites:
+          - hammer_of_justice
+        effects:
+          abilities:
+            - divine_storm
+
+      - skill_id: avatar_of_light
+        name: Avatar of Light
+        description: Become an avatar of divine light itself. Incredible holy damage bonuses.
+        tier: 5
+        prerequisites:
+          - crusader
+        effects:
+          stat_bonuses:
+            wisdom: 20
+            strength: 10
+            charisma: 10
+          combat_bonuses:
+            holy_damage_bonus: 0.50  # Additional +50% holy damage

api/app/data/classes/necromancer.yaml

@@ -0,0 +1,275 @@
+# Necromancer - DoT/Summoner
+# Flexible hybrid class: Choose Dark Affliction (DoTs/debuffs) or Raise Dead (summon undead)
+
+class_id: necromancer
+name: Necromancer
+description: >
+  A master of death magic who manipulates life force and commands the undead. Necromancers
+  excel in draining enemies over time or overwhelming foes with undead minions.
+  Choose your dark art: curse your enemies or raise an army of the dead.
+
+# Base stats (total: 65)
+base_stats:
+  strength: 8       # Low physical power
+  dexterity: 10     # Average agility
+  constitution: 10  # Average endurance
+  intelligence: 14  # High magical power
+  wisdom: 11        # Above average perception
+  charisma: 12      # Above average social (commands undead)
+
+starting_equipment:
+  - bone_wand
+  - cloth_armor
+  - rusty_knife
+
+starting_abilities:
+  - basic_attack
+
+skill_trees:
+  # ==================== DARK AFFLICTION (DoTs/Debuffs) ====================
+  - tree_id: dark_affliction
+    name: Dark Affliction
+    description: >
+      The path of the curseweaver. Master dark magic to drain life, inflict agonizing
+      curses, and watch enemies wither away over time.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: drain_life
+        name: Drain Life
+        description: Siphon life force from an enemy, damaging them and healing yourself.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - drain_life
+
+      - skill_id: dark_knowledge
+        name: Dark Knowledge
+        description: Study of forbidden arts enhances your dark magic power.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            intelligence: 5
+
+      # --- TIER 2 ---
+      - skill_id: plague
+        name: Plague
+        description: Infect an enemy with disease that spreads to nearby foes, dealing damage over time.
+        tier: 2
+        prerequisites:
+          - drain_life
+        effects:
+          abilities:
+            - plague
+
+      - skill_id: soul_harvest
+        name: Soul Harvest
+        description: Absorb the life essence of dying enemies, increasing your power.
+        tier: 2
+        prerequisites:
+          - dark_knowledge
+        effects:
+          stat_bonuses:
+            intelligence: 5
+          combat_bonuses:
+            lifesteal: 0.15  # Heal for 15% of damage dealt
+
+      # --- TIER 3 ---
+      - skill_id: curse_of_agony
+        name: Curse of Agony
+        description: Curse an enemy with excruciating pain, dealing heavy damage over 5 turns.
+        tier: 3
+        prerequisites:
+          - plague
+        effects:
+          abilities:
+            - curse_of_agony
+
+      - skill_id: dark_empowerment
+        name: Dark Empowerment
+        description: Channel dark energy to enhance all damage over time effects.
+        tier: 3
+        prerequisites:
+          - soul_harvest
+        effects:
+          stat_bonuses:
+            intelligence: 10
+          combat_bonuses:
+            dot_damage_bonus: 0.30  # +30% DoT damage
+
+      # --- TIER 4 ---
+      - skill_id: soul_rot
+        name: Soul Rot
+        description: Rot an enemy's soul, dealing massive damage over time and reducing their healing.
+        tier: 4
+        prerequisites:
+          - curse_of_agony
+        effects:
+          abilities:
+            - soul_rot
+
+      - skill_id: death_mastery
+        name: Death Mastery
+        description: Master the art of death magic, dramatically increasing curse potency.
+        tier: 4
+        prerequisites:
+          - dark_empowerment
+        effects:
+          stat_bonuses:
+            intelligence: 15
+          combat_bonuses:
+            dot_damage_bonus: 0.40  # Additional +40% DoT damage
+            lifesteal: 0.15  # Additional +15% lifesteal
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: epidemic
+        name: Epidemic
+        description: Unleash a deadly epidemic that afflicts all enemies with multiple DoTs.
+        tier: 5
+        prerequisites:
+          - soul_rot
+        effects:
+          abilities:
+            - epidemic
+
+      - skill_id: lord_of_decay
+        name: Lord of Decay
+        description: Become a lord of death and decay. Incredible DoT and drain bonuses.
+        tier: 5
+        prerequisites:
+          - death_mastery
+        effects:
+          stat_bonuses:
+            intelligence: 25
+            wisdom: 15
+          combat_bonuses:
+            dot_damage_bonus: 1.0  # Additional +100% DoT damage
+            lifesteal: 0.30  # Additional +30% lifesteal
+
+  # ==================== RAISE DEAD (Summon Undead) ====================
+  - tree_id: raise_dead
+    name: Raise Dead
+    description: >
+      The path of the necromancer. Command armies of the undead, raising fallen
+      enemies and empowering your minions with dark magic.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: summon_skeleton
+        name: Summon Skeleton
+        description: Raise a skeleton warrior from the ground to fight for you.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - summon_skeleton
+
+      - skill_id: dark_command
+        name: Dark Command
+        description: Your mastery over the undead makes your minions stronger.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            charisma: 5
+          combat_bonuses:
+            minion_damage_bonus: 0.15  # +15% minion damage
+
+      # --- TIER 2 ---
+      - skill_id: raise_ghoul
+        name: Raise Ghoul
+        description: Summon a ravenous ghoul that deals heavy melee damage.
+        tier: 2
+        prerequisites:
+          - summon_skeleton
+        effects:
+          abilities:
+            - raise_ghoul
+
+      - skill_id: unholy_bond
+        name: Unholy Bond
+        description: Strengthen your connection to the undead, empowering your minions.
+        tier: 2
+        prerequisites:
+          - dark_command
+        effects:
+          stat_bonuses:
+            charisma: 5
+          combat_bonuses:
+            minion_damage_bonus: 0.20  # Additional +20% minion damage
+            minion_health_bonus: 0.25  # +25% minion HP
+
+      # --- TIER 3 ---
+      - skill_id: corpse_explosion
+        name: Corpse Explosion
+        description: Detonate a corpse or minion, dealing massive AoE damage.
+        tier: 3
+        prerequisites:
+          - raise_ghoul
+        effects:
+          abilities:
+            - corpse_explosion
+
+      - skill_id: death_pact
+        name: Death Pact
+        description: Sacrifice a minion to restore your health and mana.
+        tier: 3
+        prerequisites:
+          - unholy_bond
+        effects:
+          abilities:
+            - death_pact
+
+      # --- TIER 4 ---
+      - skill_id: summon_abomination
+        name: Summon Abomination
+        description: Raise a massive undead abomination that dominates the battlefield.
+        tier: 4
+        prerequisites:
+          - corpse_explosion
+        effects:
+          abilities:
+            - summon_abomination
+
+      - skill_id: legion_master
+        name: Legion Master
+        description: Command larger armies of undead with increased effectiveness.
+        tier: 4
+        prerequisites:
+          - death_pact
+        effects:
+          stat_bonuses:
+            charisma: 15
+            intelligence: 5
+          combat_bonuses:
+            minion_damage_bonus: 0.35  # Additional +35% minion damage
+            minion_health_bonus: 0.50  # Additional +50% minion HP
+            max_minions: 2  # +2 max minions
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: army_of_the_dead
+        name: Army of the Dead
+        description: Summon a massive army of undead warriors to overwhelm your enemies.
+        tier: 5
+        prerequisites:
+          - summon_abomination
+        effects:
+          abilities:
+            - army_of_the_dead
+
+      - skill_id: lich_lord
+        name: Lich Lord
+        description: Transcend mortality to become a lich lord. Incredible minion bonuses.
+        tier: 5
+        prerequisites:
+          - legion_master
+        effects:
+          stat_bonuses:
+            charisma: 25
+            intelligence: 20
+          combat_bonuses:
+            minion_damage_bonus: 1.0  # Additional +100% minion damage
+            minion_health_bonus: 1.0  # Additional +100% minion HP
+            max_minions: 3  # Additional +3 max minions

api/app/data/classes/oathkeeper.yaml

@@ -0,0 +1,265 @@
+# Oathkeeper - Hybrid Tank/Healer
+# Flexible hybrid class: Choose Aegis of Light (protection/tanking) or Redemption (healing/support)
+
+class_id: oathkeeper
+name: Oathkeeper
+description: >
+  A sacred warrior bound by holy oaths. Oathkeepers excel as versatile protectors,
+  capable of becoming an unyielding shield for their allies or a beacon of healing light.
+  Choose your oath: defend the weak or redeem the fallen.
+
+# Base stats (total: 67)
+base_stats:
+  strength: 12      # Above average physical power
+  dexterity: 9      # Below average agility
+  constitution: 13  # High endurance
+  intelligence: 10  # Average magic
+  wisdom: 12        # Above average perception
+  charisma: 11      # Above average social
+
+starting_equipment:
+  - rusty_sword
+  - rusty_shield
+  - cloth_armor
+  - rusty_knife
+
+starting_abilities:
+  - basic_attack
+
+skill_trees:
+  # ==================== AEGIS OF LIGHT (Protection/Tanking) ====================
+  - tree_id: aegis_of_light
+    name: Aegis of Light
+    description: >
+      The path of the protector. Become an unyielding guardian who shields allies
+      from harm and draws enemy attention through divine resilience.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: taunt
+        name: Taunt
+        description: Challenge enemies to attack you instead of your allies.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - taunt
+
+      - skill_id: blessed_armor
+        name: Blessed Armor
+        description: Divine power enhances your natural toughness.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            constitution: 5
+
+      # --- TIER 2 ---
+      - skill_id: shield_of_faith
+        name: Shield of Faith
+        description: Conjure a holy shield that absorbs damage for you and nearby allies.
+        tier: 2
+        prerequisites:
+          - taunt
+        effects:
+          abilities:
+            - shield_of_faith
+
+      - skill_id: sacred_resilience
+        name: Sacred Resilience
+        description: Your oath grants you resistance to harm.
+        tier: 2
+        prerequisites:
+          - blessed_armor
+        effects:
+          stat_bonuses:
+            constitution: 5
+            resistance: 5
+
+      # --- TIER 3 ---
+      - skill_id: consecrated_ground
+        name: Consecrated Ground
+        description: Bless the ground beneath you, providing damage reduction to allies standing in it.
+        tier: 3
+        prerequisites:
+          - shield_of_faith
+        effects:
+          abilities:
+            - consecrated_ground
+
+      - skill_id: unbreakable_oath
+        name: Unbreakable Oath
+        description: Your oath makes you incredibly difficult to bring down.
+        tier: 3
+        prerequisites:
+          - sacred_resilience
+        effects:
+          stat_bonuses:
+            constitution: 10
+            defense: 10
+
+      # --- TIER 4 ---
+      - skill_id: divine_aegis
+        name: Divine Aegis
+        description: Summon a massive divine shield that protects all allies for 3 turns.
+        tier: 4
+        prerequisites:
+          - consecrated_ground
+        effects:
+          abilities:
+            - divine_aegis
+
+      - skill_id: indomitable
+        name: Indomitable
+        description: Nothing can break your will or body. Massive defensive bonuses.
+        tier: 4
+        prerequisites:
+          - unbreakable_oath
+        effects:
+          stat_bonuses:
+            constitution: 15
+            defense: 15
+          combat_bonuses:
+            damage_reduction: 0.15  # Reduce all damage by 15%
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: last_stand
+        name: Last Stand
+        description: Become invulnerable for 3 turns while taunting all enemies. Cannot be canceled.
+        tier: 5
+        prerequisites:
+          - divine_aegis
+        effects:
+          abilities:
+            - last_stand
+
+      - skill_id: eternal_guardian
+        name: Eternal Guardian
+        description: You are an eternal bastion of protection. Incredible defensive bonuses.
+        tier: 5
+        prerequisites:
+          - indomitable
+        effects:
+          stat_bonuses:
+            constitution: 25
+            defense: 20
+            resistance: 15
+          combat_bonuses:
+            damage_reduction: 0.30  # Additional 30% damage reduction
+
+  # ==================== REDEMPTION (Healing/Support) ====================
+  - tree_id: redemption
+    name: Redemption
+    description: >
+      The path of the redeemer. Channel divine power to heal wounds, cleanse corruption,
+      and grant your allies second chances through sacred intervention.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: lay_on_hands
+        name: Lay on Hands
+        description: Touch an ally to restore their health through divine power.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - lay_on_hands
+
+      - skill_id: divine_wisdom
+        name: Divine Wisdom
+        description: Your wisdom grows through devotion to your oath.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            wisdom: 5
+
+      # --- TIER 2 ---
+      - skill_id: cleanse
+        name: Cleanse
+        description: Remove all debuffs and negative effects from an ally.
+        tier: 2
+        prerequisites:
+          - lay_on_hands
+        effects:
+          abilities:
+            - cleanse
+
+      - skill_id: aura_of_mercy
+        name: Aura of Mercy
+        description: Emit a merciful aura that slowly heals all nearby allies each turn.
+        tier: 2
+        prerequisites:
+          - divine_wisdom
+        effects:
+          passive_effects:
+            - healing_aura  # 3% max HP per turn
+
+      # --- TIER 3 ---
+      - skill_id: word_of_healing
+        name: Word of Healing
+        description: Speak a divine word that heals all allies within range.
+        tier: 3
+        prerequisites:
+          - cleanse
+        effects:
+          abilities:
+            - word_of_healing
+
+      - skill_id: blessed_sacrifice
+        name: Blessed Sacrifice
+        description: Transfer an ally's wounds to yourself, healing them while you take damage.
+        tier: 3
+        prerequisites:
+          - aura_of_mercy
+        effects:
+          abilities:
+            - blessed_sacrifice
+
+      # --- TIER 4 ---
+      - skill_id: divine_blessing
+        name: Divine Blessing
+        description: Grant an ally a powerful blessing that increases their stats and regenerates health.
+        tier: 4
+        prerequisites:
+          - word_of_healing
+        effects:
+          abilities:
+            - divine_blessing
+
+      - skill_id: martyr
+        name: Martyr
+        description: Your willingness to sacrifice yourself empowers your healing abilities.
+        tier: 4
+        prerequisites:
+          - blessed_sacrifice
+        effects:
+          stat_bonuses:
+            wisdom: 15
+          combat_bonuses:
+            healing_power: 0.35  # +35% healing
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: miracle
+        name: Miracle
+        description: Perform a divine miracle, fully healing all allies and removing all debuffs.
+        tier: 5
+        prerequisites:
+          - divine_blessing
+        effects:
+          abilities:
+            - miracle
+
+      - skill_id: sainthood
+        name: Sainthood
+        description: Achieve sainthood through your devotion. Incredible healing and support bonuses.
+        tier: 5
+        prerequisites:
+          - martyr
+        effects:
+          stat_bonuses:
+            wisdom: 25
+            charisma: 15
+          combat_bonuses:
+            healing_power: 0.75  # Additional +75% healing
+            aura_radius: 2  # Increase aura range

api/app/data/classes/vanguard.yaml

@@ -0,0 +1,264 @@
+# Vanguard - Melee Tank/DPS
+# Flexible hybrid class: Choose Shield Bearer (tank) or Weapon Master (DPS)
+
+class_id: vanguard
+name: Vanguard
+description: >
+  A seasoned warrior who stands at the front lines of battle. Vanguards excel in melee combat,
+  capable of becoming an unbreakable shield for their allies or a relentless damage dealer.
+  Choose your path: become a stalwart defender or a devastating weapon master.
+
+# Base stats (total: 65, average: 10.83)
+base_stats:
+  strength: 14      # High physical power
+  dexterity: 10     # Average agility
+  constitution: 14  # High endurance for tanking
+  intelligence: 8   # Low magic
+  wisdom: 10        # Average perception
+  charisma: 9       # Below average social
+
+# Starting equipment (minimal)
+starting_equipment:
+  - rusty_sword
+  - cloth_armor
+  - rusty_knife  # Everyone gets pocket knife
+
+# Starting abilities
+starting_abilities:
+  - basic_attack
+
+# Skill trees (mutually exclusive playstyles)
+skill_trees:
+  # ==================== SHIELD BEARER (Tank) ====================
+  - tree_id: shield_bearer
+    name: Shield Bearer
+    description: >
+      The path of the defender. Master the shield to become an impenetrable fortress,
+      protecting your allies and controlling the battlefield.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: shield_bash
+        name: Shield Bash
+        description: Strike an enemy with your shield, dealing minor damage and stunning them for 1 turn.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - shield_bash  # References ability YAML
+
+      - skill_id: fortify
+        name: Fortify
+        description: Your defensive training grants you enhanced protection.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            defense: 5
+
+      # --- TIER 2 ---
+      - skill_id: shield_wall
+        name: Shield Wall
+        description: Raise your shield to block incoming attacks, reducing damage by 50% for 3 turns.
+        tier: 2
+        prerequisites:
+          - shield_bash
+        effects:
+          abilities:
+            - shield_wall
+
+      - skill_id: iron_skin
+        name: Iron Skin
+        description: Your body becomes hardened through relentless training.
+        tier: 2
+        prerequisites:
+          - fortify
+        effects:
+          stat_bonuses:
+            constitution: 5
+
+      # --- TIER 3 ---
+      - skill_id: guardians_resolve
+        name: Guardian's Resolve
+        description: Your unwavering determination makes you nearly impossible to break.
+        tier: 3
+        prerequisites:
+          - shield_wall
+        effects:
+          stat_bonuses:
+            defense: 10
+          passive_effects:
+            - stun_resistance  # Immune to stun when shield wall active
+
+      - skill_id: riposte
+        name: Riposte
+        description: After blocking an attack, counter with a swift strike.
+        tier: 3
+        prerequisites:
+          - iron_skin
+        effects:
+          abilities:
+            - riposte
+
+      # --- TIER 4 ---
+      - skill_id: bulwark
+        name: Bulwark
+        description: You are a living fortress, shrugging off blows that would fell lesser warriors.
+        tier: 4
+        prerequisites:
+          - guardians_resolve
+        effects:
+          stat_bonuses:
+            constitution: 10
+            resistance: 5
+
+      - skill_id: counter_strike
+        name: Counter Strike
+        description: Enhance your Riposte ability to deal critical damage when countering.
+        tier: 4
+        prerequisites:
+          - riposte
+        effects:
+          ability_enhancements:
+            riposte:
+              crit_chance_bonus: 0.3  # +30% crit on riposte
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: unbreakable
+        name: Unbreakable
+        description: Channel your inner strength to become invulnerable, reducing all damage by 75% for 5 turns.
+        tier: 5
+        prerequisites:
+          - bulwark
+        effects:
+          abilities:
+            - unbreakable  # Ultimate defensive ability
+
+      - skill_id: fortress
+        name: Fortress
+        description: Your defensive mastery reaches its peak. Permanently gain massive defensive bonuses.
+        tier: 5
+        prerequisites:
+          - counter_strike
+        effects:
+          stat_bonuses:
+            defense: 20
+            constitution: 10
+            resistance: 10
+
+  # ==================== WEAPON MASTER (DPS) ====================
+  - tree_id: weapon_master
+    name: Weapon Master
+    description: >
+      The path of destruction. Master devastating melee techniques to cut through enemies
+      with overwhelming physical power.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: power_strike
+        name: Power Strike
+        description: A heavy attack that deals 150% weapon damage.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - power_strike
+
+      - skill_id: weapon_proficiency
+        name: Weapon Proficiency
+        description: Your training with weapons grants increased physical power.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            strength: 5
+
+      # --- TIER 2 ---
+      - skill_id: cleave
+        name: Cleave
+        description: Swing your weapon in a wide arc, hitting all enemies in front of you.
+        tier: 2
+        prerequisites:
+          - power_strike
+        effects:
+          abilities:
+            - cleave  # AoE attack
+
+      - skill_id: battle_frenzy
+        name: Battle Frenzy
+        description: The heat of battle fuels your strength.
+        tier: 2
+        prerequisites:
+          - weapon_proficiency
+        effects:
+          stat_bonuses:
+            strength: 5
+
+      # --- TIER 3 ---
+      - skill_id: rending_blow
+        name: Rending Blow
+        description: Strike with such force that your enemy bleeds for 3 turns.
+        tier: 3
+        prerequisites:
+          - cleave
+        effects:
+          abilities:
+            - rending_blow  # Applies bleed DoT
+
+      - skill_id: brutal_force
+        name: Brutal Force
+        description: Your attacks become devastatingly powerful.
+        tier: 3
+        prerequisites:
+          - battle_frenzy
+        effects:
+          stat_bonuses:
+            strength: 10
+
+      # --- TIER 4 ---
+      - skill_id: execute
+        name: Execute
+        description: Finish off weakened enemies. Deals bonus damage to targets below 30% HP.
+        tier: 4
+        prerequisites:
+          - rending_blow
+        effects:
+          abilities:
+            - execute
+
+      - skill_id: weapon_mastery
+        name: Weapon Mastery
+        description: Your expertise with weapons allows you to find weak points more easily.
+        tier: 4
+        prerequisites:
+          - brutal_force
+        effects:
+          stat_bonuses:
+            strength: 5
+          combat_bonuses:
+            crit_chance: 0.15  # +15% crit chance
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: titans_wrath
+        name: Titan's Wrath
+        description: Unleash a devastating attack that deals 300% weapon damage and stuns all enemies hit.
+        tier: 5
+        prerequisites:
+          - execute
+        effects:
+          abilities:
+            - titans_wrath  # Ultimate offensive ability
+
+      - skill_id: perfect_form
+        name: Perfect Form
+        description: Your combat technique reaches perfection. Massive offensive bonuses.
+        tier: 5
+        prerequisites:
+          - weapon_mastery
+        effects:
+          stat_bonuses:
+            strength: 20
+            dexterity: 10
+          combat_bonuses:
+            crit_chance: 0.1   # Additional +10% crit
+            crit_multiplier: 0.5  # +0.5 to crit multiplier

api/app/data/classes/wildstrider.yaml

@@ -0,0 +1,275 @@
+# Wildstrider - Ranged Physical
+# Flexible hybrid class: Choose Marksmanship (precision ranged) or Beast Companion (pet damage)
+
+class_id: wildstrider
+name: Wildstrider
+description: >
+  A master of the wilds who excels at ranged combat and bonds with nature. Wildstriders
+  can become elite marksmen with unmatched accuracy or beast masters commanding powerful
+  animal companions. Choose your path: perfect your aim or unleash the wild.
+
+# Base stats (total: 66)
+base_stats:
+  strength: 10      # Average physical power
+  dexterity: 14     # High agility
+  constitution: 11  # Above average endurance
+  intelligence: 9   # Below average magic
+  wisdom: 13        # Above average perception
+  charisma: 9       # Below average social
+
+starting_equipment:
+  - rusty_bow
+  - cloth_armor
+  - rusty_knife
+
+starting_abilities:
+  - basic_attack
+
+skill_trees:
+  # ==================== MARKSMANSHIP (Precision Ranged) ====================
+  - tree_id: marksmanship
+    name: Marksmanship
+    description: >
+      The path of the sharpshooter. Master the bow to deliver devastating precision
+      strikes from afar, never missing your mark.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: aimed_shot
+        name: Aimed Shot
+        description: Take careful aim before firing, dealing increased damage with high accuracy.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - aimed_shot
+
+      - skill_id: steady_hand
+        name: Steady Hand
+        description: Your ranged accuracy improves through training.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            dexterity: 5
+
+      # --- TIER 2 ---
+      - skill_id: multishot
+        name: Multishot
+        description: Fire multiple arrows at once, hitting up to 3 targets.
+        tier: 2
+        prerequisites:
+          - aimed_shot
+        effects:
+          abilities:
+            - multishot
+
+      - skill_id: eagle_eye
+        name: Eagle Eye
+        description: Your perception sharpens, increasing critical hit chance with ranged weapons.
+        tier: 2
+        prerequisites:
+          - steady_hand
+        effects:
+          stat_bonuses:
+            wisdom: 5
+          combat_bonuses:
+            ranged_crit_chance: 0.15  # +15% crit with ranged
+
+      # --- TIER 3 ---
+      - skill_id: piercing_shot
+        name: Piercing Shot
+        description: Fire an arrow that pierces through enemies, hitting all in a line.
+        tier: 3
+        prerequisites:
+          - multishot
+        effects:
+          abilities:
+            - piercing_shot
+
+      - skill_id: deadly_aim
+        name: Deadly Aim
+        description: Your arrows find vital spots with deadly precision.
+        tier: 3
+        prerequisites:
+          - eagle_eye
+        effects:
+          stat_bonuses:
+            dexterity: 10
+          combat_bonuses:
+            ranged_crit_chance: 0.10  # Additional +10% crit
+            ranged_crit_multiplier: 0.5  # +0.5 to crit damage
+
+      # --- TIER 4 ---
+      - skill_id: explosive_shot
+        name: Explosive Shot
+        description: Fire an explosive arrow that detonates on impact, damaging nearby enemies.
+        tier: 4
+        prerequisites:
+          - piercing_shot
+        effects:
+          abilities:
+            - explosive_shot
+
+      - skill_id: master_archer
+        name: Master Archer
+        description: Your archery skills reach legendary status.
+        tier: 4
+        prerequisites:
+          - deadly_aim
+        effects:
+          stat_bonuses:
+            dexterity: 15
+          combat_bonuses:
+            ranged_damage_bonus: 0.25  # +25% ranged damage
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: rain_of_arrows
+        name: Rain of Arrows
+        description: Fire countless arrows into the sky that rain down on all enemies.
+        tier: 5
+        prerequisites:
+          - explosive_shot
+        effects:
+          abilities:
+            - rain_of_arrows
+
+      - skill_id: true_shot
+        name: True Shot
+        description: Every arrow finds its mark. Massive ranged combat bonuses.
+        tier: 5
+        prerequisites:
+          - master_archer
+        effects:
+          stat_bonuses:
+            dexterity: 20
+            wisdom: 10
+          combat_bonuses:
+            ranged_damage_bonus: 0.50  # Additional +50% ranged damage
+            ranged_crit_chance: 0.20   # Additional +20% crit
+
+  # ==================== BEAST COMPANION (Pet Damage) ====================
+  - tree_id: beast_companion
+    name: Beast Companion
+    description: >
+      The path of the beast master. Bond with a wild animal companion that fights
+      alongside you, growing stronger as your connection deepens.
+
+    nodes:
+      # --- TIER 1 ---
+      - skill_id: summon_companion
+        name: Summon Companion
+        description: Call a loyal animal companion to fight by your side.
+        tier: 1
+        prerequisites: []
+        effects:
+          abilities:
+            - summon_companion
+
+      - skill_id: animal_bond
+        name: Animal Bond
+        description: Your connection with nature strengthens your companion.
+        tier: 1
+        prerequisites: []
+        effects:
+          stat_bonuses:
+            wisdom: 5
+          combat_bonuses:
+            pet_damage_bonus: 0.15  # +15% pet damage
+
+      # --- TIER 2 ---
+      - skill_id: coordinated_attack
+        name: Coordinated Attack
+        description: Command your companion to attack with you for combined damage.
+        tier: 2
+        prerequisites:
+          - summon_companion
+        effects:
+          abilities:
+            - coordinated_attack
+
+      - skill_id: feral_instinct
+        name: Feral Instinct
+        description: Your companion becomes more ferocious and resilient.
+        tier: 2
+        prerequisites:
+          - animal_bond
+        effects:
+          stat_bonuses:
+            wisdom: 5
+          combat_bonuses:
+            pet_damage_bonus: 0.20  # Additional +20% pet damage
+            pet_health_bonus: 0.25  # +25% pet HP
+
+      # --- TIER 3 ---
+      - skill_id: bestial_wrath
+        name: Bestial Wrath
+        description: Enrage your companion, drastically increasing its damage for 3 turns.
+        tier: 3
+        prerequisites:
+          - coordinated_attack
+        effects:
+          abilities:
+            - bestial_wrath
+
+      - skill_id: wild_empathy
+        name: Wild Empathy
+        description: Your bond with beasts allows your companion to grow stronger.
+        tier: 3
+        prerequisites:
+          - feral_instinct
+        effects:
+          stat_bonuses:
+            wisdom: 10
+          combat_bonuses:
+            pet_damage_bonus: 0.25  # Additional +25% pet damage
+
+      # --- TIER 4 ---
+      - skill_id: primal_fury
+        name: Primal Fury
+        description: Your companion enters a primal rage, dealing massive damage to all enemies.
+        tier: 4
+        prerequisites:
+          - bestial_wrath
+        effects:
+          abilities:
+            - primal_fury
+
+      - skill_id: apex_predator
+        name: Apex Predator
+        description: Your companion becomes an apex predator, feared by all.
+        tier: 4
+        prerequisites:
+          - wild_empathy
+        effects:
+          stat_bonuses:
+            wisdom: 10
+          combat_bonuses:
+            pet_damage_bonus: 0.35  # Additional +35% pet damage
+            pet_health_bonus: 0.50  # Additional +50% pet HP
+            pet_crit_chance: 0.20   # +20% pet crit
+
+      # --- TIER 5 (Ultimate) ---
+      - skill_id: stampede
+        name: Stampede
+        description: Summon a stampede of beasts that trample all enemies, dealing catastrophic damage.
+        tier: 5
+        prerequisites:
+          - primal_fury
+        effects:
+          abilities:
+            - stampede
+
+      - skill_id: one_with_the_wild
+        name: One with the Wild
+        description: You and your companion become one with nature. Incredible bonuses.
+        tier: 5
+        prerequisites:
+          - apex_predator
+        effects:
+          stat_bonuses:
+            wisdom: 20
+            dexterity: 10
+          combat_bonuses:
+            pet_damage_bonus: 1.0  # Additional +100% pet damage (double damage!)
+            pet_health_bonus: 1.0  # Additional +100% pet HP

api/app/data/generic_items.yaml

@@ -0,0 +1,269 @@
+# Generic Item Templates
+# These are common mundane items that the AI can give to players during gameplay.
+# They serve as templates for AI-generated items, providing consistent values
+# for simple items like torches, food, rope, etc.
+#
+# When the AI creates a generic item, the validator will look for a matching
+# template to use as defaults. Items not matching a template will be created
+# with the AI-provided values only.
+
+templates:
+  # Light sources
+  torch:
+    name: "Torch"
+    description: "A wooden torch that provides light in dark places."
+    value: 1
+    is_tradeable: true
+    required_level: 1
+
+  lantern:
+    name: "Lantern"
+    description: "An oil lantern that provides steady light."
+    value: 10
+    is_tradeable: true
+    required_level: 1
+
+  candle:
+    name: "Candle"
+    description: "A simple wax candle."
+    value: 1
+    is_tradeable: true
+    required_level: 1
+
+  # Food and drink
+  bread:
+    name: "Bread"
+    description: "A loaf of bread, possibly stale but still edible."
+    value: 1
+    is_tradeable: true
+    required_level: 1
+
+  apple:
+    name: "Apple"
+    description: "A fresh red apple."
+    value: 1
+    is_tradeable: true
+    required_level: 1
+
+  cheese:
+    name: "Cheese"
+    description: "A wedge of aged cheese."
+    value: 2
+    is_tradeable: true
+    required_level: 1
+
+  rations:
+    name: "Rations"
+    description: "A day's worth of preserved food."
+    value: 5
+    is_tradeable: true
+    required_level: 1
+
+  water:
+    name: "Waterskin"
+    description: "A leather waterskin filled with clean water."
+    value: 2
+    is_tradeable: true
+    required_level: 1
+
+  ale:
+    name: "Ale"
+    description: "A mug of common tavern ale."
+    value: 1
+    is_tradeable: true
+    required_level: 1
+
+  wine:
+    name: "Wine"
+    description: "A bottle of wine."
+    value: 5
+    is_tradeable: true
+    required_level: 1
+
+  # Tools and supplies
+  rope:
+    name: "Rope"
+    description: "A sturdy length of hempen rope, about 50 feet."
+    value: 5
+    is_tradeable: true
+    required_level: 1
+
+  flint:
+    name: "Flint and Steel"
+    description: "A flint and steel for starting fires."
+    value: 3
+    is_tradeable: true
+    required_level: 1
+
+  bedroll:
+    name: "Bedroll"
+    description: "A simple bedroll for sleeping outdoors."
+    value: 5
+    is_tradeable: true
+    required_level: 1
+
+  backpack:
+    name: "Backpack"
+    description: "A sturdy canvas backpack."
+    value: 10
+    is_tradeable: true
+    required_level: 1
+
+  crowbar:
+    name: "Crowbar"
+    description: "An iron crowbar for prying things open."
+    value: 8
+    is_tradeable: true
+    required_level: 1
+
+  hammer:
+    name: "Hammer"
+    description: "A simple hammer."
+    value: 5
+    is_tradeable: true
+    required_level: 1
+
+  pitons:
+    name: "Pitons"
+    description: "A set of iron pitons for climbing."
+    value: 5
+    is_tradeable: true
+    required_level: 1
+
+  grappling_hook:
+    name: "Grappling Hook"
+    description: "A three-pronged iron grappling hook."
+    value: 10
+    is_tradeable: true
+    required_level: 1
+
+  # Writing supplies
+  ink:
+    name: "Ink"
+    description: "A small vial of black ink."
+    value: 5
+    is_tradeable: true
+    required_level: 1
+
+  parchment:
+    name: "Parchment"
+    description: "A sheet of parchment for writing."
+    value: 1
+    is_tradeable: true
+    required_level: 1
+
+  quill:
+    name: "Quill"
+    description: "A feather quill for writing."
+    value: 1
+    is_tradeable: true
+    required_level: 1
+
+  # Containers
+  pouch:
+    name: "Pouch"
+    description: "A small leather pouch."
+    value: 2
+    is_tradeable: true
+    required_level: 1
+
+  sack:
+    name: "Sack"
+    description: "A burlap sack for carrying goods."
+    value: 1
+    is_tradeable: true
+    required_level: 1
+
+  vial:
+    name: "Empty Vial"
+    description: "A small glass vial."
+    value: 1
+    is_tradeable: true
+    required_level: 1
+
+  # Clothing
+  cloak:
+    name: "Cloak"
+    description: "A simple traveler's cloak."
+    value: 5
+    is_tradeable: true
+    required_level: 1
+
+  boots:
+    name: "Boots"
+    description: "A sturdy pair of leather boots."
+    value: 8
+    is_tradeable: true
+    required_level: 1
+
+  gloves:
+    name: "Gloves"
+    description: "A pair of leather gloves."
+    value: 3
+    is_tradeable: true
+    required_level: 1
+
+  # Miscellaneous
+  mirror:
+    name: "Mirror"
+    description: "A small steel mirror."
+    value: 10
+    is_tradeable: true
+    required_level: 1
+
+  bell:
+    name: "Bell"
+    description: "A small brass bell."
+    value: 2
+    is_tradeable: true
+    required_level: 1
+
+  whistle:
+    name: "Whistle"
+    description: "A simple wooden whistle."
+    value: 1
+    is_tradeable: true
+    required_level: 1
+
+  key:
+    name: "Key"
+    description: "A simple iron key."
+    value: 5
+    is_tradeable: true
+    required_level: 1
+
+  map:
+    name: "Map"
+    description: "A rough map of the local area."
+    value: 15
+    is_tradeable: true
+    required_level: 1
+
+  compass:
+    name: "Compass"
+    description: "A magnetic compass for navigation."
+    value: 20
+    is_tradeable: true
+    required_level: 1
+
+  # Simple consumables
+  bandage:
+    name: "Bandage"
+    description: "A clean cloth bandage for basic wound care."
+    value: 2
+    is_tradeable: true
+    required_level: 1
+
+  antidote:
+    name: "Antidote"
+    description: "A basic herbal remedy for common poisons."
+    value: 15
+    is_tradeable: true
+    required_level: 1
+
+  herbs:
+    name: "Herbs"
+    description: "A bundle of useful herbs."
+    value: 3
+    is_tradeable: true
+    required_level: 1

api/app/data/locations/crossville/crossville_crypt.yaml

@@ -0,0 +1,46 @@
+# The Forgotten Crypt - Ancient burial site
+location_id: crossville_crypt
+name: The Forgotten Crypt
+location_type: ruins
+region_id: crossville
+
+description: |
+  Hidden beneath a collapsed stone circle deep in Thornwood Forest lies an
+  ancient crypt. The entrance, half-buried by centuries of accumulated earth
+  and roots, leads down into darkness. Faded carvings on the weathered stones
+  depict figures in robes performing unknown rituals around what appears to be
+  a great black sun.
+
+lore: |
+  Long before Crossville was founded, before even the elves came to these lands,
+  another civilization built monuments to their strange gods. The Forgotten Crypt
+  is one of their burial sites - a place where priest-kings were interred with
+  their servants and treasures. Local legends warn that the dead here do not
+  rest peacefully, and that disturbing their tombs invites a terrible curse.
+
+ambient_description: |
+  The air in the crypt is stale and cold, carrying the musty scent of ancient
+  decay. What little light enters through the broken ceiling reveals dust motes
+  floating in perfectly still air. Stone sarcophagi line the walls, their lids
+  carved with the faces of the long-dead. Some lids have been displaced,
+  revealing empty darkness within. The silence is absolute - even footsteps
+  seem muffled, as if the crypt itself absorbs sound.
+
+available_quests:
+  - quest_undead_menace
+  - quest_ancient_relic
+  - quest_necromancer_lair
+
+npc_ids: []
+
+discoverable_locations: []
+
+is_starting_location: false
+
+tags:
+  - ruins
+  - dangerous
+  - undead
+  - treasure
+  - mystery
+  - boss

api/app/data/locations/crossville/crossville_dungeon.yaml

@@ -0,0 +1,47 @@
+# The Old Mines - Abandoned dungeon beneath the hills
+location_id: crossville_dungeon
+name: The Old Mines
+location_type: dungeon
+region_id: crossville
+
+description: |
+  A network of abandoned mine tunnels carved into the hills north of Crossville.
+  The mines were sealed decades ago after a cave-in killed a dozen workers, but
+  the entrance has recently been found open. Strange sounds echo from the depths,
+  and the few who have ventured inside speak of unnatural creatures lurking in
+  the darkness.
+
+lore: |
+  The mines were originally dug by dwarven prospectors seeking iron ore. They
+  found more than iron - ancient carvings deep in the tunnels suggest something
+  else was buried here long ago. The cave-in that sealed the mines was blamed
+  on unstable rock, but survivors whispered of something awakening in the deep.
+  The mine was sealed and the entrance forbidden, until recent earthquakes
+  reopened the way.
+
+ambient_description: |
+  The mine entrance yawns like a mouth in the hillside, exhaling cold air that
+  smells of wet stone and something older. Rotting timber supports the first
+  few feet of tunnel, beyond which darkness swallows everything. Somewhere
+  in the depths, water drips with metronomic regularity. Occasionally, other
+  sounds echo up from below - scraping, shuffling, or what might be whispered
+  voices.
+
+available_quests:
+  - quest_mine_exploration
+  - quest_lost_miners
+  - quest_ancient_artifact
+
+npc_ids: []
+
+discoverable_locations:
+  - crossville_crypt
+
+is_starting_location: false
+
+tags:
+  - dungeon
+  - dangerous
+  - combat
+  - treasure
+  - mystery

api/app/data/locations/crossville/crossville_forest.yaml

@@ -0,0 +1,45 @@
+# Thornwood Forest - Wilderness area east of village
+location_id: crossville_forest
+name: Thornwood Forest
+location_type: wilderness
+region_id: crossville
+
+description: |
+  A dense woodland stretching east from Crossville, named for the thorny
+  undergrowth that makes travel off the main path treacherous. Ancient oaks
+  and twisted pines block much of the sunlight, creating an perpetual twilight
+  beneath the canopy. The eastern trade road cuts through here, though bandits
+  have made it increasingly dangerous.
+
+lore: |
+  The Thornwood is said to be as old as the mountains themselves. Local legend
+  speaks of an ancient elven settlement deep within the forest, though no one
+  has found it in living memory. What is certain is that the forest hides many
+  secrets - ancient ruins, hidden caves, and creatures that prefer darkness
+  to light. Hunters know to return before nightfall.
+
+ambient_description: |
+  Shafts of pale light filter through the canopy, illuminating swirling motes
+  of dust and pollen. The forest floor is carpeted with fallen leaves and
+  treacherous roots. Birds call from the branches above, falling silent
+  whenever something large moves through the underbrush. The air is thick
+  with the scent of damp earth and decaying vegetation.
+
+available_quests:
+  - quest_bandit_camp
+  - quest_herb_gathering
+  - quest_lost_traveler
+
+npc_ids: []
+
+discoverable_locations:
+  - crossville_dungeon
+  - crossville_crypt
+
+is_starting_location: false
+
+tags:
+  - wilderness
+  - dangerous
+  - exploration
+  - hunting

api/app/data/locations/crossville/crossville_tavern.yaml

@@ -0,0 +1,47 @@
+# The Rusty Anchor Tavern - Social hub of Crossville
+location_id: crossville_tavern
+name: The Rusty Anchor Tavern
+location_type: tavern
+region_id: crossville
+
+description: |
+  A weathered two-story establishment at the heart of Crossville Village.
+  The wooden sign creaks in the wind, depicting a rusted ship's anchor - an
+  odd choice for a landlocked village. Inside, travelers and locals alike
+  gather around rough-hewn tables to share drinks, stories, and rumors.
+
+lore: |
+  Founded eighty years ago by a retired sailor named Captain Morgath, the
+  Rusty Anchor has served as Crossville's social hub for generations.
+  The captain's old anchor hangs above the fireplace, supposedly recovered
+  from a shipwreck that cost him his crew. Many adventurers have planned
+  expeditions over tankards of the house special - a dark ale brewed from
+  a secret recipe the captain brought from the coast.
+
+ambient_description: |
+  The tavern interior is warm and dimly lit by oil lamps and the glow of
+  the stone hearth. Pipe smoke hangs in lazy clouds above the regulars'
+  corner. The air smells of ale, roasted meat, and wood polish. A bard
+  occasionally plucks at a lute in the corner, though tonight the only
+  music is the murmur of conversation and the crackle of the fire.
+
+available_quests:
+  - quest_cellar_rats
+  - quest_missing_shipment
+
+npc_ids:
+  - npc_grom_ironbeard
+  - npc_mira_swiftfoot
+
+discoverable_locations:
+  - crossville_dungeon
+  - crossville_forest
+
+is_starting_location: false
+
+tags:
+  - social
+  - rest
+  - rumors
+  - merchant
+  - information

api/app/data/locations/crossville/crossville_village.yaml

@@ -0,0 +1,44 @@
+# Crossville Village - The main settlement
+location_id: crossville_village
+name: Crossville Village
+location_type: town
+region_id: crossville
+
+description: |
+  A modest farming village built around a central square where several roads
+  meet. Stone and timber buildings line the main street, with the mayor's
+  manor overlooking the square from a small hill. Farmers sell produce at
+  market stalls while merchants hawk wares from distant lands.
+
+lore: |
+  Founded two centuries ago by settlers from the eastern kingdoms, Crossville
+  grew from a simple waystation into a thriving village. The original stone
+  well in the center of the square is said to have been blessed by a traveling
+  cleric, and the village has never suffered drought since.
+
+ambient_description: |
+  The village square bustles with activity - farmers haggling over prices,
+  children running between market stalls, and the rhythmic clang of the
+  blacksmith's hammer echoing from his forge. The smell of fresh bread
+  drifts from the bakery, mixing with the earthier scents of livestock
+  and hay.
+
+available_quests:
+  - quest_mayors_request
+  - quest_missing_merchant
+
+npc_ids:
+  - npc_mayor_aldric
+  - npc_blacksmith_hilda
+
+discoverable_locations:
+  - crossville_tavern
+  - crossville_forest
+
+is_starting_location: true
+
+tags:
+  - town
+  - social
+  - merchant
+  - safe

api/app/data/locations/regions/crossville.yaml

@@ -0,0 +1,16 @@
+# Crossville Region - Starting area for new adventurers
+region_id: crossville
+name: Crossville Province
+description: |
+  A quiet farming province on the frontier of the kingdom. Crossville sits at
+  the crossroads of several trade routes, making it a natural gathering point
+  for travelers, merchants, and those seeking adventure. The village has
+  prospered from this trade, though recent bandit activity has made the roads
+  less safe than they once were.
+
+location_ids:
+  - crossville_village
+  - crossville_tavern
+  - crossville_forest
+  - crossville_dungeon
+  - crossville_crypt

api/app/data/loot_tables.yaml

@@ -0,0 +1,281 @@
+# Loot Tables
+# Defines what items can be found when searching in different locations.
+# Items are referenced by their template key from generic_items.yaml.
+#
+# Rarity tiers determine selection based on check margin:
+#   - common: margin < 5 (just barely passed)
+#   - uncommon: margin 5-9 (solid success)
+#   - rare: margin >= 10 (excellent roll)
+#
+# Gold ranges are also determined by margin.
+
+# Default loot for unspecified locations
+default:
+  common:
+    - torch
+    - flint
+    - rope
+    - rations
+  uncommon:
+    - lantern
+    - crowbar
+    - bandage
+    - herbs
+  rare:
+    - compass
+    - map
+    - antidote
+  gold:
+    min: 1
+    max: 10
+    bonus_per_margin: 1  # Extra gold per margin point
+
+# Forest/wilderness locations
+forest:
+  common:
+    - herbs
+    - apple
+    - flint
+    - rope
+  uncommon:
+    - rations
+    - antidote
+    - bandage
+    - water
+  rare:
+    - map
+    - compass
+    - grappling_hook
+  gold:
+    min: 0
+    max: 5
+    bonus_per_margin: 0
+
+# Cave/dungeon locations
+cave:
+  common:
+    - torch
+    - flint
+    - rope
+    - pitons
+  uncommon:
+    - lantern
+    - crowbar
+    - grappling_hook
+    - bandage
+  rare:
+    - map
+    - compass
+    - key
+  gold:
+    min: 5
+    max: 25
+    bonus_per_margin: 2
+
+dungeon:
+  common:
+    - torch
+    - key
+    - rope
+    - bandage
+  uncommon:
+    - lantern
+    - crowbar
+    - antidote
+    - map
+  rare:
+    - compass
+    - grappling_hook
+    - mirror
+  gold:
+    min: 10
+    max: 50
+    bonus_per_margin: 3
+
+# Town/city locations
+town:
+  common:
+    - bread
+    - apple
+    - ale
+    - candle
+  uncommon:
+    - cheese
+    - wine
+    - rations
+    - parchment
+  rare:
+    - map
+    - ink
+    - quill
+  gold:
+    min: 2
+    max: 15
+    bonus_per_margin: 1
+
+tavern:
+  common:
+    - bread
+    - cheese
+    - ale
+    - candle
+  uncommon:
+    - wine
+    - rations
+    - water
+    - key
+  rare:
+    - map
+    - pouch
+    - mirror
+  gold:
+    min: 3
+    max: 20
+    bonus_per_margin: 2
+
+# Ruins/ancient locations
+ruins:
+  common:
+    - torch
+    - parchment
+    - vial
+    - rope
+  uncommon:
+    - ink
+    - quill
+    - mirror
+    - key
+  rare:
+    - map
+    - compass
+    - antidote
+  gold:
+    min: 10
+    max: 40
+    bonus_per_margin: 3
+
+# Camp/outdoor locations
+camp:
+  common:
+    - rations
+    - water
+    - bedroll
+    - flint
+  uncommon:
+    - rope
+    - torch
+    - bandage
+    - sack
+  rare:
+    - lantern
+    - backpack
+    - map
+  gold:
+    min: 1
+    max: 10
+    bonus_per_margin: 1
+
+# Merchant/shop locations
+shop:
+  common:
+    - pouch
+    - sack
+    - candle
+    - parchment
+  uncommon:
+    - ink
+    - quill
+    - vial
+    - key
+  rare:
+    - map
+    - mirror
+    - compass
+  gold:
+    min: 5
+    max: 30
+    bonus_per_margin: 2
+
+# Road/path locations
+road:
+  common:
+    - rope
+    - flint
+    - water
+    - bread
+  uncommon:
+    - bandage
+    - rations
+    - torch
+    - boots
+  rare:
+    - map
+    - compass
+    - cloak
+  gold:
+    min: 1
+    max: 15
+    bonus_per_margin: 1
+
+# Castle/fortress locations
+castle:
+  common:
+    - torch
+    - candle
+    - key
+    - parchment
+  uncommon:
+    - lantern
+    - ink
+    - quill
+    - mirror
+  rare:
+    - map
+    - compass
+    - crowbar
+  gold:
+    min: 15
+    max: 60
+    bonus_per_margin: 4
+
+# Dock/port locations
+dock:
+  common:
+    - rope
+    - water
+    - rations
+    - sack
+  uncommon:
+    - grappling_hook
+    - lantern
+    - map
+    - flint
+  rare:
+    - compass
+    - backpack
+    - cloak
+  gold:
+    min: 5
+    max: 25
+    bonus_per_margin: 2
+
+# Mine locations
+mine:
+  common:
+    - torch
+    - pitons
+    - rope
+    - hammer
+  uncommon:
+    - lantern
+    - crowbar
+    - flint
+    - bandage
+  rare:
+    - grappling_hook
+    - map
+    - key
+  gold:
+    min: 15
+    max: 50
+    bonus_per_margin: 3

api/app/data/npcs/crossville/npc_blacksmith_hilda.yaml

@@ -0,0 +1,93 @@
+# Hilda Ironforge - Village Blacksmith
+npc_id: npc_blacksmith_hilda
+name: Hilda Ironforge
+role: blacksmith
+location_id: crossville_village
+
+personality:
+  traits:
+    - straightforward
+    - hardworking
+    - proud of her craft
+    - protective of the village
+    - stubborn as iron
+  speech_style: |
+    Blunt and direct - says what she means without flourish. Her voice
+    carries the confidence of someone who knows their worth. Uses
+    smithing metaphors often ("hammer out the details," "strike while
+    hot"). Speaks slowly and deliberately, each word carrying weight.
+  quirks:
+    - Absent-mindedly hammers on things when thinking
+    - Inspects every weapon she sees for quality
+    - Refuses to sell poorly-made goods even at high prices
+    - Hums dwarven work songs while forging
+
+appearance:
+  brief: Muscular dwarven woman with soot-streaked red hair, burn-scarred forearms, and an appraising gaze
+  detailed: |
+    Hilda is built like a forge - solid, hot-tempered, and productive.
+    Her red hair is pulled back in a practical braid, streaked with
+    grey and permanently dusted with soot. Her forearms are a map of
+    old burns and calluses, badges of honor in her trade. She wears a
+    leather apron over practical clothes, and her hands are never far
+    from a hammer. Her eyes assess everything with the critical gaze of
+    a master craftsman, always noting quality - or its lack.
+
+knowledge:
+  public:
+    - The best iron ore came from the Old Mines before they were sealed
+    - She can repair almost anything made of metal
+    - Bandit attacks have increased demand for weapons
+    - Her family has been smithing in Crossville for four generations
+  secret:
+    - Her grandfather forged something for the previous mayor - something that was buried
+    - She has the original designs for that artifact
+    - The ore in the mines had unusual properties - made metal stronger
+    - She suspects the bandits are looking for her grandfather's work
+  will_share_if:
+    - condition: "interaction_count >= 4"
+      reveals: "Mentions her grandfather worked on a special project for the mayor's family"
+    - condition: "custom_flags.brought_quality_ore == true"
+      reveals: "Shares that the mine ore was special - almost magical"
+    - condition: "relationship_level >= 75"
+      reveals: "Shows them her grandfather's old designs"
+    - condition: "custom_flags.proved_worthy_warrior == true"
+      reveals: "Offers to forge them something special if they find the right materials"
+
+relationships:
+  - npc_id: npc_grom_ironbeard
+    attitude: friendly
+    reason: Old drinking companions and fellow dwarves
+  - npc_id: npc_mayor_aldric
+    attitude: respectful but curious
+    reason: The Thornwood family has secrets connected to her own
+
+inventory_for_sale:
+  - item: sword_iron
+    price: 50
+  - item: shield_iron
+    price: 40
+  - item: armor_chainmail
+    price: 150
+  - item: dagger_steel
+    price: 25
+  - item: repair_service
+    price: 20
+
+dialogue_hooks:
+  greeting: "*sets down hammer* Something you need forged, or just looking?"
+  farewell: "May your blade stay sharp and your armor hold."
+  busy: "*keeps hammering* Talk while I work. Time is iron."
+  quest_complete: "*nods approvingly* Fine work. You've got the heart of a warrior."
+
+quest_giver_for:
+  - quest_ore_delivery
+  - quest_equipment_repair
+
+reveals_locations: []
+
+tags:
+  - merchant
+  - quest_giver
+  - craftsman
+  - dwarf

api/app/data/npcs/crossville/npc_grom_ironbeard.yaml

@@ -0,0 +1,95 @@
+# Grom Ironbeard - Tavern Bartender
+npc_id: npc_grom_ironbeard
+name: Grom Ironbeard
+role: bartender
+location_id: crossville_tavern
+
+personality:
+  traits:
+    - gruff
+    - secretly kind
+    - protective of regulars
+    - distrustful of strangers
+    - nostalgic about his adventuring days
+  speech_style: |
+    Short, clipped sentences. Heavy dwarvish accent - often drops articles
+    ("Need a drink?" becomes "Need drink?"). Speaks in a gravelly baritone.
+    Uses "lad" and "lass" frequently. Never raises his voice unless truly angry.
+  quirks:
+    - Polishes the same glass when nervous or thinking
+    - Tugs his beard when considering something seriously
+    - Refuses to serve anyone who insults his ale
+    - Hums old mining songs when the tavern is quiet
+
+appearance:
+  brief: Stocky dwarf with a braided grey beard, one clouded eye, and arms like tree trunks
+  detailed: |
+    Standing barely four feet tall, Grom's broad shoulders and thick arms
+    speak to decades of barrel-lifting and troublemaker-throwing. His grey
+    beard is immaculately braided with copper rings passed down from his
+    grandfather. A milky cataract clouds his left eye - a souvenir from his
+    adventuring days - but his right eye misses nothing that happens in his
+    tavern. His apron is always clean, though his hands bear the calluses
+    of hard work.
+
+knowledge:
+  public:
+    - Local gossip about Mayor Aldric raising taxes again
+    - The road east through Thornwood has been plagued by bandits
+    - A traveling merchant was asking about ancient ruins last week
+    - The blacksmith Hilda needs more iron ore but the mines are sealed
+  secret:
+    - Hidden passage behind the wine barrels leads to old smuggling tunnels
+    - The mayor is being blackmailed by someone - he's seen the letters
+    - Knows the location of a legendary dwarven forge in the mountains
+    - The cave-in in the mines wasn't natural - something broke through from below
+  will_share_if:
+    - condition: "interaction_count >= 3"
+      reveals: "Mentions he used to be an adventurer who explored the Old Mines"
+    - condition: "custom_flags.helped_with_rowdy_patrons == true"
+      reveals: "Shows them the hidden passage behind the wine barrels"
+    - condition: "relationship_level >= 70"
+      reveals: "Confides about the mayor's blackmail situation"
+    - condition: "relationship_level >= 85"
+      reveals: "Shares the location of the dwarven forge"
+
+relationships:
+  - npc_id: npc_mayor_aldric
+    attitude: distrustful
+    reason: Mayor raised tavern taxes unfairly and seems nervous lately
+  - npc_id: npc_mira_swiftfoot
+    attitude: protective
+    reason: She reminds him of his daughter who died young
+  - npc_id: npc_blacksmith_hilda
+    attitude: friendly
+    reason: Fellow dwarf and drinking companion for decades
+
+inventory_for_sale:
+  - item: ale
+    price: 2
+  - item: dwarven_stout
+    price: 5
+  - item: meal_hearty
+    price: 8
+  - item: room_night
+    price: 15
+  - item: information_local
+    price: 10
+
+dialogue_hooks:
+  greeting: "*grunts* What'll it be? And don't waste my time."
+  farewell: "*nods* Don't cause trouble out there."
+  busy: "Got thirsty folk to serve. Make it quick."
+  quest_complete: "*actually smiles* Well done, lad. Drink's on the house."
+
+quest_giver_for:
+  - quest_cellar_rats
+
+reveals_locations:
+  - crossville_dungeon
+
+tags:
+  - merchant
+  - quest_giver
+  - information_source
+  - dwarf

api/app/data/npcs/crossville/npc_mayor_aldric.yaml

@@ -0,0 +1,83 @@
+# Mayor Aldric Thornwood - Village Leader
+npc_id: npc_mayor_aldric
+name: Mayor Aldric Thornwood
+role: mayor
+location_id: crossville_village
+
+personality:
+  traits:
+    - outwardly confident
+    - secretly terrified
+    - genuinely cares about the village
+    - increasingly desperate
+    - hiding something significant
+  speech_style: |
+    Speaks with the practiced cadence of a politician - measured words,
+    careful pauses for effect. His voice wavers slightly when stressed,
+    and he has a habit of clearing his throat before difficult topics.
+    Uses formal address even in casual conversation.
+  quirks:
+    - Constantly adjusts his mayoral chain of office
+    - Glances at his manor when the Old Mines are mentioned
+    - Keeps touching a ring on his left hand
+    - Offers wine to guests but never drinks himself
+
+appearance:
+  brief: Tall, thin man with receding grey hair, worry lines, and expensive but slightly disheveled clothing
+  detailed: |
+    Mayor Aldric carries himself with the posture of authority, though
+    lately that posture has developed a slight stoop. His grey hair,
+    once meticulously combed, shows signs of distracted neglect. His
+    clothes are fine but wrinkled, and dark circles under his eyes
+    suggest many sleepless nights. The heavy gold chain of his office
+    seems to weigh on him more than it should. His hands tremble
+    slightly when he thinks no one is watching.
+
+knowledge:
+  public:
+    - The village has prospered under his ten-year leadership
+    - Taxes were raised to fund road repairs and militia expansion
+    - He's offering a reward for clearing the bandit threat
+    - The Old Mines are sealed for safety reasons
+  secret:
+    - He's being blackmailed by someone who knows about the mines
+    - His grandfather found something in the mines that should stay buried
+    - The blackmailer wants access to the crypt
+    - He knows the earthquake that reopened the mines wasn't natural
+  will_share_if:
+    - condition: "relationship_level >= 60"
+      reveals: "Admits the tax increase was forced by external pressure"
+    - condition: "custom_flags.proved_trustworthy == true"
+      reveals: "Confesses he's being blackmailed but won't say by whom"
+    - condition: "relationship_level >= 80"
+      reveals: "Shares his grandfather's journal about the mines"
+    - condition: "custom_flags.defeated_blackmailer == true"
+      reveals: "Reveals everything about what's buried in the crypt"
+
+relationships:
+  - npc_id: npc_grom_ironbeard
+    attitude: guilty
+    reason: Knows the tax increase hurt the tavern unfairly
+  - npc_id: npc_blacksmith_hilda
+    attitude: respectful
+    reason: Her family has served the village for generations
+
+inventory_for_sale: []
+
+dialogue_hooks:
+  greeting: "*straightens his chain* Ah, welcome to Crossville. How may I be of service?"
+  farewell: "The village thanks you. May your roads be safe."
+  busy: "*distracted* I have urgent matters to attend. Perhaps later?"
+  quest_complete: "*genuine relief* You have done Crossville a great service."
+
+quest_giver_for:
+  - quest_mayors_request
+  - quest_bandit_threat
+
+reveals_locations:
+  - crossville_dungeon
+
+tags:
+  - quest_giver
+  - authority
+  - human

api/app/data/npcs/crossville/npc_mira_swiftfoot.yaml

@@ -0,0 +1,90 @@
+# Mira Swiftfoot - Rogue and Information Broker
+npc_id: npc_mira_swiftfoot
+name: Mira Swiftfoot
+role: rogue
+location_id: crossville_tavern
+
+personality:
+  traits:
+    - curious
+    - street-smart
+    - morally flexible
+    - loyal once trust is earned
+    - haunted by her past
+  speech_style: |
+    Quick and clever, often speaking in half-sentences as if her mouth
+    can't keep up with her racing thoughts. Uses thieves' cant occasionally.
+    Tends to deflect personal questions with humor or questions of her own.
+    Her voice drops to a whisper when sharing secrets.
+  quirks:
+    - Always sits with her back to the wall, facing the door
+    - Fidgets with a coin, rolling it across her knuckles
+    - Sizes up everyone who enters the tavern
+    - Never drinks anything she didn't pour herself
+
+appearance:
+  brief: Slender half-elf with sharp green eyes, dark hair cut short, and fingers that never stop moving
+  detailed: |
+    Mira moves with the easy grace of someone used to slipping through
+    shadows unnoticed. Her dark hair is cut practically short, framing
+    an angular face with sharp green eyes that seem to catalog everything
+    they see. She dresses in muted colors - browns and greys that blend
+    into any crowd. A thin scar runs from her left ear to her jaw, and
+    she wears leather bracers that probably hide more than calluses.
+
+knowledge:
+  public:
+    - The bandits in Thornwood are more organized than simple thieves
+    - There's a fence in the city who buys no-questions-asked
+    - The mayor's been receiving mysterious visitors at night
+    - Several people have gone missing in the forest lately
+  secret:
+    - The bandit leader is a former soldier named Kael
+    - She knows a secret entrance to the crypt through the forest
+    - The missing people were all asking about the Old Mines
+    - She's actually running from a thieves' guild she betrayed
+  will_share_if:
+    - condition: "interaction_count >= 2"
+      reveals: "Mentions the bandits seem to be searching for something specific"
+    - condition: "custom_flags.shared_drink == true"
+      reveals: "Admits she knows more about the forest than most"
+    - condition: "relationship_level >= 65"
+      reveals: "Reveals she knows a secret path to the crypt"
+    - condition: "relationship_level >= 80"
+      reveals: "Tells them about Kael and offers to help infiltrate the bandits"
+
+relationships:
+  - npc_id: npc_grom_ironbeard
+    attitude: affectionate
+    reason: He's the closest thing to family she has
+  - npc_id: npc_mayor_aldric
+    attitude: suspicious
+    reason: Something about him doesn't add up
+
+inventory_for_sale:
+  - item: lockpick_set
+    price: 25
+  - item: rope_silk
+    price: 15
+  - item: map_local
+    price: 20
+
+dialogue_hooks:
+  greeting: "*looks you over* New face. What brings you to our little crossroads?"
+  farewell: "Watch your back out there. Trust me on that."
+  busy: "*glances at the door* Not now. Later."
+  quest_complete: "*grins* You've got potential. Stick around."
+
+quest_giver_for:
+  - quest_bandit_camp
+
+reveals_locations:
+  - crossville_forest
+  - crossville_crypt
+
+tags:
+  - information_source
+  - merchant
+  - quest_giver
+  - rogue
+  - half-elf

api/app/data/origins.yaml

@@ -0,0 +1,158 @@
+# Character Origin Stories
+# These are saved to the character and referenced by the AI DM throughout the game
+# to create personalized narrative experiences and quest hooks.
+
+origins:
+  soul_revenant:
+    id: soul_revenant
+    name: Soul Revenant
+    description: |
+      You died centuries ago, but death was not the end. Through dark magic, divine
+      intervention, or a cosmic mistake, you have been returned to the world of the
+      living. Your memories are fragmented—flashes of a life long past, faces you once
+      knew now turned to dust, and deeds both noble and terrible that weigh upon your soul.
+
+      The world has changed beyond recognition. The kingdom you served no longer exists,
+      the people you loved are gone, and the wrongs you committed—or suffered—can never
+      be undone. Yet here you stand, given a second chance you never asked for.
+
+      You awaken in an ancient crypt, your body restored but your purpose unclear.
+      Are you here to atone? To finish unfinished business? Or simply to understand
+      why you were brought back?
+
+    starting_location:
+      id: forgotten_crypt
+      name: The Forgotten Crypt
+      region: Shadowmere Necropolis
+      description: Ancient burial grounds beneath twisted trees, where the veil between life and death grows thin
+
+    narrative_hooks:
+      - Past lives and forgotten memories that surface during gameplay
+      - NPCs or descendants related to your previous life
+      - Unfinished business from centuries ago
+      - Haunted by spectral visions or voices from the past
+      - Divine or dark entities interested in your return
+      - Questions about identity and purpose across lifetimes
+
+    starting_bonus:
+      trait: Deathless Resolve
+      description: You have walked through death itself. Fear holds less power over you.
+      effect: +2 WIS, resistance to fear effects
+
+  memory_thief:
+    id: memory_thief
+    name: Memory Thief
+    description: |
+      You opened your eyes in an open field with no memory of who you are, where you
+      came from, or how you got here. Your mind is a blank slate—no name, no past,
+      no identity. Even your own face in a reflection seems like a stranger's.
+
+      The only thing you possess is an overwhelming sense that something was taken
+      from you. Your memories weren't simply lost—they were stolen. By whom? Why?
+      You don't know. But deep in your gut, you feel that discovering the truth might
+      be more terrifying than living in ignorance.
+
+      As you wander the world, fragments occasionally surface—a fleeting image, a
+      half-remembered name, a skill you didn't know you had. Are these clues to your
+      real identity, or false memories planted by whoever stole your past?
+
+      One thing is certain: you must piece together who you were, even if you discover
+      you were someone you'd rather not remember.
+
+    starting_location:
+      id: thornfield_plains
+      name: Thornfield Plains
+      region: The Midlands
+      description: Vast open grasslands where merchant roads cross, a place of new beginnings for the lost
+
+    narrative_hooks:
+      - Gradual memory fragments revealed during key story moments
+      - NPCs who seem to recognize you but you don't remember them
+      - Clues to your stolen past hidden in the world
+      - A mysterious organization or individual who took your memories
+      - Skills or knowledge you possess without knowing why
+      - Identity crisis as you discover who you might have been
+
+    starting_bonus:
+      trait: Blank Slate
+      description: Without a past to define you, you adapt quickly to new situations.
+      effect: +1 to all stats, faster skill learning
+
+  shadow_apprentice:
+    id: shadow_apprentice
+    name: Shadow Apprentice
+    description: |
+      You were raised in darkness—literally and figuratively. From childhood, you were
+      trained by a mysterious master who taught you the arts of stealth, deception,
+      and survival in the underworld. You learned to move unseen, to read people's
+      secrets in their eyes, and to trust no one.
+
+      Your master never revealed why they chose you, only that you had "potential."
+      For years, you honed your skills in the shadows, taking on jobs that required
+      discretion and ruthlessness. You became a weapon in your master's hands.
+
+      But recently, everything changed. Your master disappeared without a word, leaving
+      you with only your training and a single cryptic message: "Trust no one. Not even me."
+
+      Now you walk alone, unsure if your master abandoned you, was captured, or is
+      testing you one final time. The underworld you once navigated so confidently
+      suddenly feels hostile and full of eyes watching from the darkness.
+
+    starting_location:
+      id: shadowfen
+      name: Shadowfen
+      region: The Murkvale
+      description: A misty swamp settlement where outlaws and exiles gather, hidden from the world's judging eyes
+
+    narrative_hooks:
+      - The mysterious master and their true motivations
+      - Dark organizations or guilds from your past
+      - Moral dilemmas between loyalty and self-preservation
+      - Rivals or enemies from your apprenticeship
+      - Secrets your master never told you
+      - The true reason you were chosen and trained
+
+    starting_bonus:
+      trait: Trained in Shadows
+      description: Your master taught you well. The darkness is your ally.
+      effect: +2 DEX, +1 CHA, advantage on stealth checks in darkness
+
+  escaped_captive:
+    id: escaped_captive
+    name: The Escaped Captive
+    description: |
+      You were a prisoner at Ironpeak Pass, one of the most notorious holding facilities
+      in the realm. How you ended up there, you remember all too well—whether you were
+      guilty or innocent, the iron bars didn't care. Days blurred into weeks, weeks into
+      months, and you felt yourself becoming just another forgotten soul.
+
+      But you refused to accept that fate. Through cunning, luck, or sheer desperation,
+      you escaped. Now you stand on the other side of those mountain walls, breathing
+      free air for the first time in what feels like forever.
+
+      Freedom tastes sweet, but it comes with a price. The authorities will be searching
+      for you. Your face might be on wanted posters. Anyone who learns of your past might
+      turn you in for a reward. You must build a new life while constantly looking over
+      your shoulder.
+
+      Can you truly start fresh, or will your past always define you? That depends on
+      the choices you make from here.
+
+    starting_location:
+      id: ironpeak_pass
+      name: Ironpeak Pass
+      region: The Frost Peaks
+      description: A treacherous mountain passage near the prison you escaped, where few travelers venture
+
+    narrative_hooks:
+      - Bounty hunters or guards searching for you
+      - NPCs who recognize you from your past
+      - The crime you were imprisoned for (guilty or framed)
+      - Fellow prisoners or guards from Ironpeak
+      - Building a new identity while hiding your past
+      - Redemption arc or embracing your criminal nature
+
+    starting_bonus:
+      trait: Hardened Survivor
+      description: Prison taught you to endure hardship and seize opportunities.
+      effect: +2 CON, +1 STR, bonus to survival and escape checks

api/app/game_logic/__init__.py

@@ -0,0 +1,34 @@
+"""
+Game logic module for Code of Conquest.
+
+This module contains core game mechanics that determine outcomes
+before they are passed to AI for narration.
+"""
+
+from app.game_logic.dice import (
+    CheckResult,
+    SkillType,
+    Difficulty,
+    roll_d20,
+    calculate_modifier,
+    skill_check,
+    get_stat_for_skill,
+    perception_check,
+    stealth_check,
+    persuasion_check,
+    lockpicking_check,
+)
+
+__all__ = [
+    "CheckResult",
+    "SkillType",
+    "Difficulty",
+    "roll_d20",
+    "calculate_modifier",
+    "skill_check",
+    "get_stat_for_skill",
+    "perception_check",
+    "stealth_check",
+    "persuasion_check",
+    "lockpicking_check",
+]

api/app/game_logic/dice.py

@@ -0,0 +1,247 @@
+"""
+Dice mechanics module for Code of Conquest.
+
+This module provides core dice rolling functionality using a D20 + modifier vs DC system.
+All game chance mechanics (searches, skill checks, etc.) use these functions to determine
+outcomes before passing results to AI for narration.
+"""
+
+import random
+from dataclasses import dataclass
+from typing import Optional
+from enum import Enum
+
+
+class Difficulty(Enum):
+    """Standard difficulty classes for skill checks."""
+    TRIVIAL = 5
+    EASY = 10
+    MEDIUM = 15
+    HARD = 20
+    VERY_HARD = 25
+    NEARLY_IMPOSSIBLE = 30
+
+
+class SkillType(Enum):
+    """
+    Skill types and their associated base stats.
+
+    Each skill maps to a core stat for modifier calculation.
+    """
+    # Wisdom-based
+    PERCEPTION = "wisdom"
+    INSIGHT = "wisdom"
+    SURVIVAL = "wisdom"
+    MEDICINE = "wisdom"
+
+    # Dexterity-based
+    STEALTH = "dexterity"
+    ACROBATICS = "dexterity"
+    SLEIGHT_OF_HAND = "dexterity"
+    LOCKPICKING = "dexterity"
+
+    # Charisma-based
+    PERSUASION = "charisma"
+    DECEPTION = "charisma"
+    INTIMIDATION = "charisma"
+    PERFORMANCE = "charisma"
+
+    # Strength-based
+    ATHLETICS = "strength"
+
+    # Intelligence-based
+    ARCANA = "intelligence"
+    HISTORY = "intelligence"
+    INVESTIGATION = "intelligence"
+    NATURE = "intelligence"
+    RELIGION = "intelligence"
+
+    # Constitution-based
+    ENDURANCE = "constitution"
+
+
+@dataclass
+class CheckResult:
+    """
+    Result of a dice check.
+
+    Contains all information needed for UI display (dice roll animation)
+    and game logic (success/failure determination).
+
+    Attributes:
+        roll: The natural d20 roll (1-20)
+        modifier: Total modifier from stats
+        total: roll + modifier
+        dc: Difficulty class that was checked against
+        success: Whether the check succeeded
+        margin: How much the check succeeded or failed by (total - dc)
+        skill_type: The skill used for this check (if applicable)
+    """
+    roll: int
+    modifier: int
+    total: int
+    dc: int
+    success: bool
+    margin: int
+    skill_type: Optional[str] = None
+
+    @property
+    def is_critical_success(self) -> bool:
+        """Natural 20 - only relevant for combat."""
+        return self.roll == 20
+
+    @property
+    def is_critical_failure(self) -> bool:
+        """Natural 1 - only relevant for combat."""
+        return self.roll == 1
+
+    def to_dict(self) -> dict:
+        """Serialize for API response."""
+        return {
+            "roll": self.roll,
+            "modifier": self.modifier,
+            "total": self.total,
+            "dc": self.dc,
+            "success": self.success,
+            "margin": self.margin,
+            "skill_type": self.skill_type,
+        }
+
+
+def roll_d20() -> int:
+    """
+    Roll a standard 20-sided die.
+
+    Returns:
+        Integer from 1 to 20 (inclusive)
+    """
+    return random.randint(1, 20)
+
+
+def calculate_modifier(stat_value: int) -> int:
+    """
+    Calculate the D&D-style modifier from a stat value.
+
+    Formula: (stat - 10) // 2
+
+    Examples:
+        - Stat 10 = +0 modifier
+        - Stat 14 = +2 modifier
+        - Stat 18 = +4 modifier
+        - Stat 8 = -1 modifier
+
+    Args:
+        stat_value: The raw stat value (typically 1-20)
+
+    Returns:
+        The modifier value (can be negative)
+    """
+    return (stat_value - 10) // 2
+
+
+def skill_check(
+    stat_value: int,
+    dc: int,
+    skill_type: Optional[SkillType] = None,
+    bonus: int = 0
+) -> CheckResult:
+    """
+    Perform a skill check: d20 + modifier vs DC.
+
+    Args:
+        stat_value: The relevant stat value (e.g., character's wisdom for perception)
+        dc: Difficulty class to beat
+        skill_type: Optional skill type for logging/display
+        bonus: Additional bonus (e.g., from equipment or proficiency)
+
+    Returns:
+        CheckResult with full details of the roll
+    """
+    roll = roll_d20()
+    modifier = calculate_modifier(stat_value) + bonus
+    total = roll + modifier
+    success = total >= dc
+    margin = total - dc
+
+    return CheckResult(
+        roll=roll,
+        modifier=modifier,
+        total=total,
+        dc=dc,
+        success=success,
+        margin=margin,
+        skill_type=skill_type.name if skill_type else None
+    )
+
+
+def get_stat_for_skill(skill_type: SkillType) -> str:
+    """
+    Get the base stat name for a skill type.
+
+    Args:
+        skill_type: The skill to look up
+
+    Returns:
+        The stat name (e.g., "wisdom", "dexterity")
+    """
+    return skill_type.value
+
+
+def perception_check(wisdom: int, dc: int, bonus: int = 0) -> CheckResult:
+    """
+    Convenience function for perception checks (searching, spotting).
+
+    Args:
+        wisdom: Character's wisdom stat
+        dc: Difficulty class
+        bonus: Additional bonus
+
+    Returns:
+        CheckResult
+    """
+    return skill_check(wisdom, dc, SkillType.PERCEPTION, bonus)
+
+
+def stealth_check(dexterity: int, dc: int, bonus: int = 0) -> CheckResult:
+    """
+    Convenience function for stealth checks (sneaking, hiding).
+
+    Args:
+        dexterity: Character's dexterity stat
+        dc: Difficulty class
+        bonus: Additional bonus
+
+    Returns:
+        CheckResult
+    """
+    return skill_check(dexterity, dc, SkillType.STEALTH, bonus)
+
+
+def persuasion_check(charisma: int, dc: int, bonus: int = 0) -> CheckResult:
+    """
+    Convenience function for persuasion checks (convincing, negotiating).
+
+    Args:
+        charisma: Character's charisma stat
+        dc: Difficulty class
+        bonus: Additional bonus
+
+    Returns:
+        CheckResult
+    """
+    return skill_check(charisma, dc, SkillType.PERSUASION, bonus)
+
+
+def lockpicking_check(dexterity: int, dc: int, bonus: int = 0) -> CheckResult:
+    """
+    Convenience function for lockpicking checks.
+
+    Args:
+        dexterity: Character's dexterity stat
+        dc: Difficulty class
+        bonus: Additional bonus
+
+    Returns:
+        CheckResult
+    """
+    return skill_check(dexterity, dc, SkillType.LOCKPICKING, bonus)

api/app/models/__init__.py

@@ -0,0 +1,87 @@
+"""
+Data models for Code of Conquest.
+
+This package contains all dataclass models used throughout the application.
+"""
+
+# Enums
+from app.models.enums import (
+    EffectType,
+    DamageType,
+    ItemType,
+    StatType,
+    AbilityType,
+    CombatStatus,
+    SessionStatus,
+    ListingStatus,
+    ListingType,
+)
+
+# Core models
+from app.models.stats import Stats
+from app.models.effects import Effect
+from app.models.abilities import Ability, AbilityLoader
+from app.models.items import Item
+
+# Progression
+from app.models.skills import SkillNode, SkillTree, PlayerClass
+
+# Character
+from app.models.character import Character
+
+# Combat
+from app.models.combat import Combatant, CombatEncounter
+
+# Session
+from app.models.session import (
+    SessionConfig,
+    GameState,
+    ConversationEntry,
+    GameSession,
+)
+
+# Marketplace
+from app.models.marketplace import (
+    Bid,
+    MarketplaceListing,
+    Transaction,
+    ShopItem,
+)
+
+__all__ = [
+    # Enums
+    "EffectType",
+    "DamageType",
+    "ItemType",
+    "StatType",
+    "AbilityType",
+    "CombatStatus",
+    "SessionStatus",
+    "ListingStatus",
+    "ListingType",
+    # Core models
+    "Stats",
+    "Effect",
+    "Ability",
+    "AbilityLoader",
+    "Item",
+    # Progression
+    "SkillNode",
+    "SkillTree",
+    "PlayerClass",
+    # Character
+    "Character",
+    # Combat
+    "Combatant",
+    "CombatEncounter",
+    # Session
+    "SessionConfig",
+    "GameState",
+    "ConversationEntry",
+    "GameSession",
+    # Marketplace
+    "Bid",
+    "MarketplaceListing",
+    "Transaction",
+    "ShopItem",
+]

api/app/models/abilities.py

@@ -0,0 +1,237 @@
+"""
+Ability system for combat actions and spells.
+
+This module defines abilities (attacks, spells, skills) that can be used in combat.
+Abilities are loaded from YAML configuration files for data-driven design.
+"""
+
+from dataclasses import dataclass, field, asdict
+from typing import Dict, Any, List, Optional
+import yaml
+import os
+from pathlib import Path
+
+from app.models.enums import AbilityType, DamageType, EffectType, StatType
+from app.models.effects import Effect
+from app.models.stats import Stats
+
+
+@dataclass
+class Ability:
+    """
+    Represents an action that can be taken in combat.
+
+    Abilities can deal damage, apply effects, heal, or perform other actions.
+    They are loaded from YAML files for easy game design iteration.
+
+    Attributes:
+        ability_id: Unique identifier
+        name: Display name
+        description: What the ability does
+        ability_type: Category (attack, spell, skill, etc.)
+        base_power: Base damage or healing value
+        damage_type: Type of damage dealt (physical, fire, etc.)
+        scaling_stat: Which stat scales this ability's power (if any)
+        scaling_factor: Multiplier for scaling stat (default 0.5)
+        mana_cost: MP required to use this ability
+        cooldown: Turns before ability can be used again
+        effects_applied: List of effects applied to target on hit
+        is_aoe: Whether this affects multiple targets
+        target_count: Number of targets if AoE (0 = all)
+    """
+
+    ability_id: str
+    name: str
+    description: str
+    ability_type: AbilityType
+    base_power: int = 0
+    damage_type: Optional[DamageType] = None
+    scaling_stat: Optional[StatType] = None
+    scaling_factor: float = 0.5
+    mana_cost: int = 0
+    cooldown: int = 0
+    effects_applied: List[Effect] = field(default_factory=list)
+    is_aoe: bool = False
+    target_count: int = 1
+
+    def calculate_power(self, caster_stats: Stats) -> int:
+        """
+        Calculate final power based on caster's stats.
+
+        Formula: base_power + (scaling_stat × scaling_factor)
+        Minimum power is always 1.
+
+        Args:
+            caster_stats: The caster's effective stats
+
+        Returns:
+            Final power value for damage or healing
+        """
+        power = self.base_power
+
+        if self.scaling_stat:
+            stat_value = getattr(caster_stats, self.scaling_stat.value)
+            power += int(stat_value * self.scaling_factor)
+
+        return max(1, power)
+
+    def get_effects_to_apply(self) -> List[Effect]:
+        """
+        Get a copy of effects that should be applied to target(s).
+
+        Creates new Effect instances to avoid sharing references.
+
+        Returns:
+            List of Effect instances to apply
+        """
+        return [
+            Effect(
+                effect_id=f"{self.ability_id}_{effect.name}_{id(effect)}",
+                name=effect.name,
+                effect_type=effect.effect_type,
+                duration=effect.duration,
+                power=effect.power,
+                stat_affected=effect.stat_affected,
+                stacks=effect.stacks,
+                max_stacks=effect.max_stacks,
+                source=self.ability_id,
+            )
+            for effect in self.effects_applied
+        ]
+
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Serialize ability to a dictionary.
+
+        Returns:
+            Dictionary containing all ability data
+        """
+        data = asdict(self)
+        data["ability_type"] = self.ability_type.value
+        if self.damage_type:
+            data["damage_type"] = self.damage_type.value
+        if self.scaling_stat:
+            data["scaling_stat"] = self.scaling_stat.value
+        data["effects_applied"] = [effect.to_dict() for effect in self.effects_applied]
+        return data
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Ability':
+        """
+        Deserialize ability from a dictionary.
+
+        Args:
+            data: Dictionary containing ability data
+
+        Returns:
+            Ability instance
+        """
+        # Convert string values back to enums
+        ability_type = AbilityType(data["ability_type"])
+        damage_type = DamageType(data["damage_type"]) if data.get("damage_type") else None
+        scaling_stat = StatType(data["scaling_stat"]) if data.get("scaling_stat") else None
+
+        # Deserialize effects
+        effects = []
+        if "effects_applied" in data and data["effects_applied"]:
+            effects = [Effect.from_dict(e) for e in data["effects_applied"]]
+
+        return cls(
+            ability_id=data["ability_id"],
+            name=data["name"],
+            description=data["description"],
+            ability_type=ability_type,
+            base_power=data.get("base_power", 0),
+            damage_type=damage_type,
+            scaling_stat=scaling_stat,
+            scaling_factor=data.get("scaling_factor", 0.5),
+            mana_cost=data.get("mana_cost", 0),
+            cooldown=data.get("cooldown", 0),
+            effects_applied=effects,
+            is_aoe=data.get("is_aoe", False),
+            target_count=data.get("target_count", 1),
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the ability."""
+        return (
+            f"Ability({self.name}, {self.ability_type.value}, "
+            f"power={self.base_power}, cost={self.mana_cost}MP, "
+            f"cooldown={self.cooldown}t)"
+        )
+
+
+class AbilityLoader:
+    """
+    Loads abilities from YAML configuration files.
+
+    This allows game designers to define abilities without touching code.
+    """
+
+    def __init__(self, data_dir: Optional[str] = None):
+        """
+        Initialize the ability loader.
+
+        Args:
+            data_dir: Path to directory containing ability YAML files
+                     Defaults to /app/data/abilities/
+        """
+        if data_dir is None:
+            # Default to app/data/abilities relative to this file
+            current_file = Path(__file__)
+            app_dir = current_file.parent.parent  # Go up to /app
+            data_dir = str(app_dir / "data" / "abilities")
+
+        self.data_dir = Path(data_dir)
+        self._ability_cache: Dict[str, Ability] = {}
+
+    def load_ability(self, ability_id: str) -> Optional[Ability]:
+        """
+        Load a single ability by ID.
+
+        Args:
+            ability_id: Unique ability identifier
+
+        Returns:
+            Ability instance or None if not found
+        """
+        # Check cache first
+        if ability_id in self._ability_cache:
+            return self._ability_cache[ability_id]
+
+        # Load from YAML file
+        yaml_file = self.data_dir / f"{ability_id}.yaml"
+        if not yaml_file.exists():
+            return None
+
+        with open(yaml_file, 'r') as f:
+            data = yaml.safe_load(f)
+
+        ability = Ability.from_dict(data)
+        self._ability_cache[ability_id] = ability
+        return ability
+
+    def load_all_abilities(self) -> Dict[str, Ability]:
+        """
+        Load all abilities from the data directory.
+
+        Returns:
+            Dictionary mapping ability_id to Ability instance
+        """
+        if not self.data_dir.exists():
+            return {}
+
+        abilities = {}
+        for yaml_file in self.data_dir.glob("*.yaml"):
+            with open(yaml_file, 'r') as f:
+                data = yaml.safe_load(f)
+
+            ability = Ability.from_dict(data)
+            abilities[ability.ability_id] = ability
+            self._ability_cache[ability.ability_id] = ability
+
+        return abilities
+
+    def clear_cache(self) -> None:
+        """Clear the ability cache, forcing reload on next access."""
+        self._ability_cache.clear()

api/app/models/action_prompt.py

@@ -0,0 +1,296 @@
+"""
+Action Prompt Model
+
+This module defines the ActionPrompt dataclass for button-based story actions.
+Each action prompt represents a predefined action that players can take during
+story progression, with tier-based availability and context filtering.
+
+Usage:
+    from app.models.action_prompt import ActionPrompt, ActionCategory, LocationType
+
+    action = ActionPrompt(
+        prompt_id="ask_locals",
+        category=ActionCategory.ASK_QUESTION,
+        display_text="Ask locals for information",
+        description="Talk to NPCs to learn about quests and rumors",
+        tier_required=UserTier.FREE,
+        context_filter=[LocationType.TOWN, LocationType.TAVERN],
+        dm_prompt_template="The player asks locals about {{ topic }}..."
+    )
+
+    if action.is_available(UserTier.FREE, LocationType.TOWN):
+        # Show action button to player
+        pass
+"""
+
+from dataclasses import dataclass, field
+from enum import Enum
+from typing import List, Optional, Any, Dict
+
+from app.ai.model_selector import UserTier
+
+
+@dataclass
+class CheckRequirement:
+    """
+    Defines the dice check required for an action.
+
+    Used to determine outcomes before AI narration.
+    """
+    check_type: str  # "search" or "skill"
+    skill: Optional[str] = None  # For skill checks: perception, persuasion, etc.
+    difficulty: str = "medium"  # trivial, easy, medium, hard, very_hard
+
+    def to_dict(self) -> dict:
+        """Serialize for API response."""
+        return {
+            "check_type": self.check_type,
+            "skill": self.skill,
+            "difficulty": self.difficulty,
+        }
+
+    @classmethod
+    def from_dict(cls, data: dict) -> "CheckRequirement":
+        """Create from dictionary."""
+        return cls(
+            check_type=data.get("check_type", "skill"),
+            skill=data.get("skill"),
+            difficulty=data.get("difficulty", "medium"),
+        )
+
+
+class ActionCategory(str, Enum):
+    """Categories of story actions."""
+    ASK_QUESTION = "ask_question"      # Gather information from NPCs
+    TRAVEL = "travel"                  # Move to a new location
+    GATHER_INFO = "gather_info"        # Search or investigate
+    REST = "rest"                      # Rest and recover
+    INTERACT = "interact"              # Interact with objects/environment
+    EXPLORE = "explore"                # Explore the area
+    SPECIAL = "special"                # Special tier-specific actions
+
+
+class LocationType(str, Enum):
+    """Types of locations in the game world."""
+    TOWN = "town"                      # Populated settlements
+    TAVERN = "tavern"                  # Taverns and inns
+    WILDERNESS = "wilderness"          # Outdoor areas, forests, fields
+    DUNGEON = "dungeon"                # Dungeons and caves
+    SAFE_AREA = "safe_area"            # Protected zones, temples
+    LIBRARY = "library"                # Libraries and archives
+    ANY = "any"                        # Available in all locations
+
+
+@dataclass
+class ActionPrompt:
+    """
+    Represents a predefined story action that players can select.
+
+    Action prompts are displayed as buttons in the story UI. Each action
+    has tier requirements and context filters to determine availability.
+
+    Attributes:
+        prompt_id: Unique identifier for the action
+        category: Category of action (ASK_QUESTION, TRAVEL, etc.)
+        display_text: Text shown on the action button
+        description: Tooltip/help text explaining the action
+        tier_required: Minimum subscription tier required
+        context_filter: List of location types where action is available
+        dm_prompt_template: Jinja2 template for generating AI prompt
+        icon: Optional icon name for the button
+        cooldown_turns: Optional cooldown in turns before action can be used again
+    """
+
+    prompt_id: str
+    category: ActionCategory
+    display_text: str
+    description: str
+    tier_required: UserTier
+    context_filter: List[LocationType]
+    dm_prompt_template: str
+    icon: Optional[str] = None
+    cooldown_turns: int = 0
+    requires_check: Optional[CheckRequirement] = None
+
+    def is_available(self, user_tier: UserTier, location_type: LocationType) -> bool:
+        """
+        Check if this action is available for a user at a location.
+
+        Args:
+            user_tier: The user's subscription tier
+            location_type: The current location type
+
+        Returns:
+            True if the action is available, False otherwise
+        """
+        # Check tier requirement
+        if not self._tier_meets_requirement(user_tier):
+            return False
+
+        # Check location filter
+        if not self._location_matches_filter(location_type):
+            return False
+
+        return True
+
+    def _tier_meets_requirement(self, user_tier: UserTier) -> bool:
+        """
+        Check if user tier meets the minimum requirement.
+
+        Tier hierarchy: FREE < BASIC < PREMIUM < ELITE
+
+        Args:
+            user_tier: The user's subscription tier
+
+        Returns:
+            True if tier requirement is met
+        """
+        tier_order = {
+            UserTier.FREE: 0,
+            UserTier.BASIC: 1,
+            UserTier.PREMIUM: 2,
+            UserTier.ELITE: 3,
+        }
+
+        user_level = tier_order.get(user_tier, 0)
+        required_level = tier_order.get(self.tier_required, 0)
+
+        return user_level >= required_level
+
+    def _location_matches_filter(self, location_type: LocationType) -> bool:
+        """
+        Check if location matches the context filter.
+
+        Args:
+            location_type: The current location type
+
+        Returns:
+            True if location matches filter
+        """
+        # ANY location type matches everything
+        if LocationType.ANY in self.context_filter:
+            return True
+
+        # Check if location is in the filter list
+        return location_type in self.context_filter
+
+    def is_locked(self, user_tier: UserTier) -> bool:
+        """
+        Check if this action is locked due to tier restriction.
+
+        Used to show locked actions with upgrade prompts.
+
+        Args:
+            user_tier: The user's subscription tier
+
+        Returns:
+            True if the action is locked (tier too low)
+        """
+        return not self._tier_meets_requirement(user_tier)
+
+    def get_lock_reason(self, user_tier: UserTier) -> Optional[str]:
+        """
+        Get the reason why an action is locked.
+
+        Args:
+            user_tier: The user's subscription tier
+
+        Returns:
+            Lock reason message, or None if not locked
+        """
+        if not self._tier_meets_requirement(user_tier):
+            tier_names = {
+                UserTier.FREE: "Free",
+                UserTier.BASIC: "Basic",
+                UserTier.PREMIUM: "Premium",
+                UserTier.ELITE: "Elite",
+            }
+            required_name = tier_names.get(self.tier_required, "Unknown")
+            return f"Requires {required_name} tier or higher"
+
+        return None
+
+    def to_dict(self) -> dict:
+        """
+        Convert to dictionary for JSON serialization.
+
+        Returns:
+            Dictionary representation of the action prompt
+        """
+        result = {
+            "prompt_id": self.prompt_id,
+            "category": self.category.value,
+            "display_text": self.display_text,
+            "description": self.description,
+            "tier_required": self.tier_required.value,
+            "context_filter": [loc.value for loc in self.context_filter],
+            "dm_prompt_template": self.dm_prompt_template,
+            "icon": self.icon,
+            "cooldown_turns": self.cooldown_turns,
+        }
+        if self.requires_check:
+            result["requires_check"] = self.requires_check.to_dict()
+        return result
+
+    @classmethod
+    def from_dict(cls, data: dict) -> "ActionPrompt":
+        """
+        Create an ActionPrompt from a dictionary.
+
+        Args:
+            data: Dictionary containing action prompt data
+
+        Returns:
+            ActionPrompt instance
+
+        Raises:
+            ValueError: If required fields are missing or invalid
+        """
+        # Parse category enum
+        category_str = data.get("category", "")
+        try:
+            category = ActionCategory(category_str)
+        except ValueError:
+            raise ValueError(f"Invalid action category: {category_str}")
+
+        # Parse tier enum
+        tier_str = data.get("tier_required", "free")
+        try:
+            tier_required = UserTier(tier_str)
+        except ValueError:
+            raise ValueError(f"Invalid user tier: {tier_str}")
+
+        # Parse location types
+        context_filter_raw = data.get("context_filter", ["any"])
+        context_filter = []
+        for loc_str in context_filter_raw:
+            try:
+                context_filter.append(LocationType(loc_str.lower()))
+            except ValueError:
+                raise ValueError(f"Invalid location type: {loc_str}")
+
+        # Parse requires_check if present
+        requires_check = None
+        if "requires_check" in data and data["requires_check"]:
+            requires_check = CheckRequirement.from_dict(data["requires_check"])
+
+        return cls(
+            prompt_id=data.get("prompt_id", ""),
+            category=category,
+            display_text=data.get("display_text", ""),
+            description=data.get("description", ""),
+            tier_required=tier_required,
+            context_filter=context_filter,
+            dm_prompt_template=data.get("dm_prompt_template", ""),
+            icon=data.get("icon"),
+            cooldown_turns=data.get("cooldown_turns", 0),
+            requires_check=requires_check,
+        )
+
+    def __repr__(self) -> str:
+        """String representation for debugging."""
+        return (
+            f"ActionPrompt(prompt_id='{self.prompt_id}', "
+            f"category={self.category.value}, "
+            f"tier={self.tier_required.value})"
+        )

api/app/models/ai_usage.py

@@ -0,0 +1,211 @@
+"""
+AI Usage data model for tracking AI generation costs and usage.
+
+This module defines the AIUsageLog dataclass which represents a single AI usage
+event for tracking costs, tokens used, and generating usage analytics.
+"""
+
+from dataclasses import dataclass, field
+from datetime import datetime, timezone, date
+from typing import Dict, Any, Optional
+from enum import Enum
+
+
+class TaskType(str, Enum):
+    """Types of AI tasks that can be tracked."""
+    STORY_PROGRESSION = "story_progression"
+    COMBAT_NARRATION = "combat_narration"
+    QUEST_SELECTION = "quest_selection"
+    NPC_DIALOGUE = "npc_dialogue"
+    GENERAL = "general"
+
+
+@dataclass
+class AIUsageLog:
+    """
+    Represents a single AI usage event for cost and usage tracking.
+
+    This dataclass captures all relevant information about an AI API call
+    including the user, model used, tokens consumed, and estimated cost.
+    Used for:
+    - Cost monitoring and budgeting
+    - Usage analytics per user/tier
+    - Rate limiting enforcement
+    - Billing and invoicing (future)
+
+    Attributes:
+        log_id: Unique identifier for this usage log entry
+        user_id: User who made the request
+        timestamp: When the request was made
+        model: Model identifier (e.g., "meta/meta-llama-3-8b-instruct")
+        tokens_input: Number of input tokens (prompt)
+        tokens_output: Number of output tokens (response)
+        tokens_total: Total tokens used (input + output)
+        estimated_cost: Estimated cost in USD
+        task_type: Type of task (story, combat, quest, npc)
+        session_id: Optional game session ID for context
+        character_id: Optional character ID for context
+        request_duration_ms: How long the request took in milliseconds
+        success: Whether the request completed successfully
+        error_message: Error message if the request failed
+    """
+
+    log_id: str
+    user_id: str
+    timestamp: datetime
+    model: str
+    tokens_input: int
+    tokens_output: int
+    tokens_total: int
+    estimated_cost: float
+    task_type: TaskType
+    session_id: Optional[str] = None
+    character_id: Optional[str] = None
+    request_duration_ms: int = 0
+    success: bool = True
+    error_message: Optional[str] = None
+
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Convert usage log to dictionary for storage.
+
+        Returns:
+            Dictionary representation suitable for Appwrite storage
+        """
+        return {
+            "user_id": self.user_id,
+            "timestamp": self.timestamp.isoformat() if isinstance(self.timestamp, datetime) else self.timestamp,
+            "model": self.model,
+            "tokens_input": self.tokens_input,
+            "tokens_output": self.tokens_output,
+            "tokens_total": self.tokens_total,
+            "estimated_cost": self.estimated_cost,
+            "task_type": self.task_type.value if isinstance(self.task_type, TaskType) else self.task_type,
+            "session_id": self.session_id,
+            "character_id": self.character_id,
+            "request_duration_ms": self.request_duration_ms,
+            "success": self.success,
+            "error_message": self.error_message,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> "AIUsageLog":
+        """
+        Create AIUsageLog from dictionary.
+
+        Args:
+            data: Dictionary with usage log data
+
+        Returns:
+            AIUsageLog instance
+        """
+        # Parse timestamp
+        timestamp = data.get("timestamp")
+        if isinstance(timestamp, str):
+            timestamp = datetime.fromisoformat(timestamp.replace('Z', '+00:00'))
+        elif timestamp is None:
+            timestamp = datetime.now(timezone.utc)
+
+        # Parse task type
+        task_type = data.get("task_type", "general")
+        if isinstance(task_type, str):
+            try:
+                task_type = TaskType(task_type)
+            except ValueError:
+                task_type = TaskType.GENERAL
+
+        return cls(
+            log_id=data.get("log_id", ""),
+            user_id=data.get("user_id", ""),
+            timestamp=timestamp,
+            model=data.get("model", ""),
+            tokens_input=data.get("tokens_input", 0),
+            tokens_output=data.get("tokens_output", 0),
+            tokens_total=data.get("tokens_total", 0),
+            estimated_cost=data.get("estimated_cost", 0.0),
+            task_type=task_type,
+            session_id=data.get("session_id"),
+            character_id=data.get("character_id"),
+            request_duration_ms=data.get("request_duration_ms", 0),
+            success=data.get("success", True),
+            error_message=data.get("error_message"),
+        )
+
+
+@dataclass
+class DailyUsageSummary:
+    """
+    Summary of AI usage for a specific day.
+
+    Used for reporting and rate limiting checks.
+
+    Attributes:
+        date: The date of this summary
+        user_id: User ID
+        total_requests: Number of AI requests made
+        total_tokens: Total tokens consumed
+        total_input_tokens: Total input tokens
+        total_output_tokens: Total output tokens
+        estimated_cost: Total estimated cost in USD
+        requests_by_task: Breakdown of requests by task type
+    """
+
+    date: date
+    user_id: str
+    total_requests: int
+    total_tokens: int
+    total_input_tokens: int
+    total_output_tokens: int
+    estimated_cost: float
+    requests_by_task: Dict[str, int] = field(default_factory=dict)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert summary to dictionary."""
+        return {
+            "date": self.date.isoformat() if isinstance(self.date, date) else self.date,
+            "user_id": self.user_id,
+            "total_requests": self.total_requests,
+            "total_tokens": self.total_tokens,
+            "total_input_tokens": self.total_input_tokens,
+            "total_output_tokens": self.total_output_tokens,
+            "estimated_cost": self.estimated_cost,
+            "requests_by_task": self.requests_by_task,
+        }
+
+
+@dataclass
+class MonthlyUsageSummary:
+    """
+    Summary of AI usage for a specific month.
+
+    Used for billing and cost projections.
+
+    Attributes:
+        year: Year
+        month: Month (1-12)
+        user_id: User ID
+        total_requests: Number of AI requests made
+        total_tokens: Total tokens consumed
+        estimated_cost: Total estimated cost in USD
+        daily_breakdown: List of daily summaries
+    """
+
+    year: int
+    month: int
+    user_id: str
+    total_requests: int
+    total_tokens: int
+    estimated_cost: float
+    daily_breakdown: list = field(default_factory=list)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert summary to dictionary."""
+        return {
+            "year": self.year,
+            "month": self.month,
+            "user_id": self.user_id,
+            "total_requests": self.total_requests,
+            "total_tokens": self.total_tokens,
+            "estimated_cost": self.estimated_cost,
+            "daily_breakdown": self.daily_breakdown,
+        }

api/app/models/character.py

@@ -0,0 +1,452 @@
+"""
+Character data model - the core entity for player characters.
+
+This module defines the Character dataclass which represents a player's character
+with all their stats, inventory, progression, and the critical get_effective_stats()
+method that calculates final stats from all sources.
+"""
+
+from dataclasses import dataclass, field, asdict
+from typing import Dict, Any, List, Optional
+
+from app.models.stats import Stats
+from app.models.items import Item
+from app.models.skills import PlayerClass, SkillNode
+from app.models.effects import Effect
+from app.models.enums import EffectType, StatType
+from app.models.origins import Origin
+
+
+@dataclass
+class Character:
+    """
+    Represents a player's character.
+
+    This is the central data model that ties together all character-related data:
+    stats, class, inventory, progression, and quests.
+
+    The critical method is get_effective_stats() which calculates the final stats
+    by combining base stats + equipment bonuses + skill bonuses + active effects.
+
+    Attributes:
+        character_id: Unique identifier
+        user_id: Owner's user ID (from Appwrite auth)
+        name: Character name
+        player_class: Character's class (determines base stats and skill trees)
+        origin: Character's backstory origin (saved for AI DM narrative hooks)
+        level: Current level
+        experience: Current XP points
+        base_stats: Base stats (from class + level-ups)
+        unlocked_skills: List of skill_ids that have been unlocked
+        inventory: All items the character owns
+        equipped: Currently equipped items by slot
+                 Slots: "weapon", "armor", "helmet", "boots", "accessory", etc.
+        gold: Currency amount
+        active_quests: List of quest IDs currently in progress
+        discovered_locations: List of location IDs the character has visited
+        current_location: Current location ID (tracks character position)
+    """
+
+    character_id: str
+    user_id: str
+    name: str
+    player_class: PlayerClass
+    origin: Origin
+    level: int = 1
+    experience: int = 0
+
+    # Stats and progression
+    base_stats: Stats = field(default_factory=Stats)
+    unlocked_skills: List[str] = field(default_factory=list)
+
+    # Inventory and equipment
+    inventory: List[Item] = field(default_factory=list)
+    equipped: Dict[str, Item] = field(default_factory=dict)
+    gold: int = 0
+
+    # Quests and exploration
+    active_quests: List[str] = field(default_factory=list)
+    discovered_locations: List[str] = field(default_factory=list)
+    current_location: Optional[str] = None  # Set to origin starting location on creation
+
+    # NPC interaction tracking (persists across sessions)
+    # Each entry: {npc_id: {interaction_count, relationship_level, dialogue_history, ...}}
+    # dialogue_history: List[{player_line: str, npc_response: str}]
+    npc_interactions: Dict[str, Dict] = field(default_factory=dict)
+
+    def get_effective_stats(self, active_effects: Optional[List[Effect]] = None) -> Stats:
+        """
+        Calculate final effective stats from all sources.
+
+        This is the CRITICAL METHOD that combines:
+        1. Base stats (from character)
+        2. Equipment bonuses (from equipped items)
+        3. Skill tree bonuses (from unlocked skills)
+        4. Active effect modifiers (buffs/debuffs)
+
+        Args:
+            active_effects: Currently active effects on this character (from combat)
+
+        Returns:
+            Stats instance with all modifiers applied
+        """
+        # Start with a copy of base stats
+        effective = self.base_stats.copy()
+
+        # Apply equipment bonuses
+        for item in self.equipped.values():
+            for stat_name, bonus in item.stat_bonuses.items():
+                if hasattr(effective, stat_name):
+                    current_value = getattr(effective, stat_name)
+                    setattr(effective, stat_name, current_value + bonus)
+
+        # Apply skill tree bonuses
+        skill_bonuses = self._get_skill_bonuses()
+        for stat_name, bonus in skill_bonuses.items():
+            if hasattr(effective, stat_name):
+                current_value = getattr(effective, stat_name)
+                setattr(effective, stat_name, current_value + bonus)
+
+        # Apply active effect modifiers (buffs/debuffs)
+        if active_effects:
+            for effect in active_effects:
+                if effect.effect_type in [EffectType.BUFF, EffectType.DEBUFF]:
+                    if effect.stat_affected:
+                        stat_name = effect.stat_affected.value
+                        if hasattr(effective, stat_name):
+                            current_value = getattr(effective, stat_name)
+                            modifier = effect.power * effect.stacks
+
+                            if effect.effect_type == EffectType.BUFF:
+                                setattr(effective, stat_name, current_value + modifier)
+                            else:  # DEBUFF
+                                # Stats can't go below 1
+                                setattr(effective, stat_name, max(1, current_value - modifier))
+
+        return effective
+
+    def _get_skill_bonuses(self) -> Dict[str, int]:
+        """
+        Calculate total stat bonuses from unlocked skills.
+
+        Returns:
+            Dictionary of stat bonuses from skill tree
+        """
+        bonuses: Dict[str, int] = {}
+
+        # Get all skill nodes from all trees
+        all_skills = self.player_class.get_all_skills()
+
+        # Sum up bonuses from unlocked skills
+        for skill in all_skills:
+            if skill.skill_id in self.unlocked_skills:
+                skill_bonuses = skill.get_stat_bonuses()
+                for stat_name, bonus in skill_bonuses.items():
+                    bonuses[stat_name] = bonuses.get(stat_name, 0) + bonus
+
+        return bonuses
+
+    def get_unlocked_abilities(self) -> List[str]:
+        """
+        Get all ability IDs unlocked by this character's skills.
+
+        Returns:
+            List of ability_ids from skill tree + class starting abilities
+        """
+        abilities = list(self.player_class.starting_abilities)
+
+        # Get all skill nodes from all trees
+        all_skills = self.player_class.get_all_skills()
+
+        # Collect abilities from unlocked skills
+        for skill in all_skills:
+            if skill.skill_id in self.unlocked_skills:
+                abilities.extend(skill.get_unlocked_abilities())
+
+        return abilities
+
+    @property
+    def class_id(self) -> str:
+        """Get class ID for template access."""
+        return self.player_class.class_id
+
+    @property
+    def origin_id(self) -> str:
+        """Get origin ID for template access."""
+        return self.origin.id
+
+    @property
+    def origin_name(self) -> str:
+        """Get origin display name for template access."""
+        return self.origin.name
+
+    @property
+    def available_skill_points(self) -> int:
+        """Calculate available skill points (1 per level minus unlocked skills)."""
+        return self.level - len(self.unlocked_skills)
+
+    @property
+    def max_hp(self) -> int:
+        """
+        Calculate max HP from constitution.
+        Uses the Stats.hit_points property which calculates: 10 + (constitution * 2)
+        """
+        effective_stats = self.get_effective_stats()
+        return effective_stats.hit_points
+
+    @property
+    def current_hp(self) -> int:
+        """
+        Get current HP.
+        Outside of combat, characters are at full health.
+        During combat, this would be tracked separately in the combat state.
+        """
+        # For now, always return max HP (full health outside combat)
+        # TODO: Track combat damage separately when implementing combat system
+        return self.max_hp
+
+    def can_afford(self, cost: int) -> bool:
+        """Check if character has enough gold."""
+        return self.gold >= cost
+
+    def add_gold(self, amount: int) -> None:
+        """Add gold to character's wallet."""
+        self.gold += amount
+
+    def remove_gold(self, amount: int) -> bool:
+        """
+        Remove gold from character's wallet.
+
+        Returns:
+            True if successful, False if insufficient gold
+        """
+        if not self.can_afford(amount):
+            return False
+        self.gold -= amount
+        return True
+
+    def add_item(self, item: Item) -> None:
+        """Add an item to character's inventory."""
+        self.inventory.append(item)
+
+    def remove_item(self, item_id: str) -> Optional[Item]:
+        """
+        Remove an item from inventory by ID.
+
+        Returns:
+            The removed Item or None if not found
+        """
+        for i, item in enumerate(self.inventory):
+            if item.item_id == item_id:
+                return self.inventory.pop(i)
+        return None
+
+    def equip_item(self, item: Item, slot: str) -> Optional[Item]:
+        """
+        Equip an item to a specific slot.
+
+        Args:
+            item: Item to equip
+            slot: Equipment slot ("weapon", "armor", etc.)
+
+        Returns:
+            Previously equipped item in that slot (or None)
+        """
+        # Remove from inventory
+        self.remove_item(item.item_id)
+
+        # Unequip current item in slot if present
+        previous = self.equipped.get(slot)
+        if previous:
+            self.add_item(previous)
+
+        # Equip new item
+        self.equipped[slot] = item
+        return previous
+
+    def unequip_item(self, slot: str) -> Optional[Item]:
+        """
+        Unequip an item from a slot.
+
+        Args:
+            slot: Equipment slot to unequip from
+
+        Returns:
+            The unequipped Item or None if slot was empty
+        """
+        if slot not in self.equipped:
+            return None
+
+        item = self.equipped.pop(slot)
+        self.add_item(item)
+        return item
+
+    def add_experience(self, xp: int) -> bool:
+        """
+        Add experience points and check for level up.
+
+        Args:
+            xp: Amount of experience to add
+
+        Returns:
+            True if character leveled up, False otherwise
+        """
+        self.experience += xp
+        required_xp = self._calculate_xp_for_next_level()
+
+        if self.experience >= required_xp:
+            self.level_up()
+            return True
+
+        return False
+
+    def level_up(self) -> None:
+        """
+        Level up the character.
+
+        - Increases level
+        - Resets experience to overflow amount
+        - Could grant stat increases (future enhancement)
+        """
+        required_xp = self._calculate_xp_for_next_level()
+        overflow_xp = self.experience - required_xp
+
+        self.level += 1
+        self.experience = overflow_xp
+
+        # Future: Apply stat increases based on class
+        # For now, stats are increased manually via skill points
+
+    def _calculate_xp_for_next_level(self) -> int:
+        """
+        Calculate XP required for next level.
+
+        Formula: 100 * (level ^ 1.5)
+        This creates an exponential curve: 100, 282, 519, 800, 1118...
+
+        Returns:
+            XP required for next level
+        """
+        return int(100 * (self.level ** 1.5))
+
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Serialize character to dictionary for JSON storage.
+
+        Returns:
+            Dictionary containing all character data
+        """
+        return {
+            "character_id": self.character_id,
+            "user_id": self.user_id,
+            "name": self.name,
+            "player_class": self.player_class.to_dict(),
+            "origin": self.origin.to_dict(),
+            "level": self.level,
+            "experience": self.experience,
+            "base_stats": self.base_stats.to_dict(),
+            "unlocked_skills": self.unlocked_skills,
+            "inventory": [item.to_dict() for item in self.inventory],
+            "equipped": {slot: item.to_dict() for slot, item in self.equipped.items()},
+            "gold": self.gold,
+            "active_quests": self.active_quests,
+            "discovered_locations": self.discovered_locations,
+            "current_location": self.current_location,
+            "npc_interactions": self.npc_interactions,
+            # Computed properties for AI templates
+            "current_hp": self.current_hp,
+            "max_hp": self.max_hp,
+        }
+
+    def to_story_dict(self) -> Dict[str, Any]:
+        """
+        Serialize only story-relevant character data for AI prompts.
+
+        This trimmed version reduces token usage by excluding mechanical
+        details that aren't needed for narrative generation (IDs, full
+        inventory details, skill trees, etc.).
+
+        Returns:
+            Dictionary containing story-relevant character data
+        """
+        effective_stats = self.get_effective_stats()
+
+        # Get equipped item names for context (not full details)
+        equipped_summary = {}
+        for slot, item in self.equipped.items():
+            equipped_summary[slot] = item.name
+
+        # Get skill names from unlocked skills
+        skill_names = []
+        all_skills = self.player_class.get_all_skills()
+        for skill in all_skills:
+            if skill.skill_id in self.unlocked_skills:
+                skill_names.append({
+                    "name": skill.name,
+                    "level": 1  # Skills don't have levels, but template expects this
+                })
+
+        return {
+            "name": self.name,
+            "level": self.level,
+            "player_class": self.player_class.name,
+            "origin_name": self.origin.name,
+            "current_hp": self.current_hp,
+            "max_hp": self.max_hp,
+            "gold": self.gold,
+            # Stats for display and checks
+            "stats": effective_stats.to_dict(),
+            "base_stats": self.base_stats.to_dict(),
+            # Simplified collections
+            "skills": skill_names,
+            "equipped": equipped_summary,
+            "inventory_count": len(self.inventory),
+            "active_quests_count": len(self.active_quests),
+            # Empty list for templates that check completed_quests
+            "effects": [],  # Active effects passed separately in combat
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Character':
+        """
+        Deserialize character from dictionary.
+
+        Args:
+            data: Dictionary containing character data
+
+        Returns:
+            Character instance
+        """
+        from app.models.skills import PlayerClass
+
+        player_class = PlayerClass.from_dict(data["player_class"])
+        origin = Origin.from_dict(data["origin"])
+        base_stats = Stats.from_dict(data["base_stats"])
+        inventory = [Item.from_dict(item) for item in data.get("inventory", [])]
+        equipped = {slot: Item.from_dict(item) for slot, item in data.get("equipped", {}).items()}
+
+        return cls(
+            character_id=data["character_id"],
+            user_id=data["user_id"],
+            name=data["name"],
+            player_class=player_class,
+            origin=origin,
+            level=data.get("level", 1),
+            experience=data.get("experience", 0),
+            base_stats=base_stats,
+            unlocked_skills=data.get("unlocked_skills", []),
+            inventory=inventory,
+            equipped=equipped,
+            gold=data.get("gold", 0),
+            active_quests=data.get("active_quests", []),
+            discovered_locations=data.get("discovered_locations", []),
+            current_location=data.get("current_location"),
+            npc_interactions=data.get("npc_interactions", {}),
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the character."""
+        return (
+            f"Character({self.name}, {self.player_class.name}, "
+            f"Lv{self.level}, {self.gold}g)"
+        )

api/app/models/combat.py

@@ -0,0 +1,414 @@
+"""
+Combat system data models.
+
+This module defines the combat-related dataclasses including Combatant (a wrapper
+for characters/enemies in combat) and CombatEncounter (the combat state manager).
+"""
+
+from dataclasses import dataclass, field, asdict
+from typing import Dict, Any, List, Optional
+import random
+
+from app.models.stats import Stats
+from app.models.effects import Effect
+from app.models.abilities import Ability
+from app.models.enums import CombatStatus, EffectType
+
+
+@dataclass
+class Combatant:
+    """
+    Represents a character or enemy in combat.
+
+    This wraps either a player Character or an NPC/enemy for combat purposes,
+    tracking combat-specific state like current HP/MP, active effects, and cooldowns.
+
+    Attributes:
+        combatant_id: Unique identifier (character_id or enemy_id)
+        name: Display name
+        is_player: True if player character, False if NPC/enemy
+        current_hp: Current hit points
+        max_hp: Maximum hit points
+        current_mp: Current mana points
+        max_mp: Maximum mana points
+        stats: Current combat stats (use get_effective_stats() from Character)
+        active_effects: Effects currently applied to this combatant
+        abilities: Available abilities for this combatant
+        cooldowns: Map of ability_id to turns remaining
+        initiative: Turn order value (rolled at combat start)
+    """
+
+    combatant_id: str
+    name: str
+    is_player: bool
+    current_hp: int
+    max_hp: int
+    current_mp: int
+    max_mp: int
+    stats: Stats
+    active_effects: List[Effect] = field(default_factory=list)
+    abilities: List[str] = field(default_factory=list)  # ability_ids
+    cooldowns: Dict[str, int] = field(default_factory=dict)
+    initiative: int = 0
+
+    def is_alive(self) -> bool:
+        """Check if combatant is still alive."""
+        return self.current_hp > 0
+
+    def is_dead(self) -> bool:
+        """Check if combatant is dead."""
+        return self.current_hp <= 0
+
+    def is_stunned(self) -> bool:
+        """Check if combatant is stunned and cannot act."""
+        return any(e.effect_type == EffectType.STUN for e in self.active_effects)
+
+    def take_damage(self, damage: int) -> int:
+        """
+        Apply damage to this combatant.
+
+        Damage is reduced by shields first, then HP.
+
+        Args:
+            damage: Amount of damage to apply
+
+        Returns:
+            Actual damage dealt to HP (after shields)
+        """
+        remaining_damage = damage
+
+        # Apply shield absorption
+        for effect in self.active_effects:
+            if effect.effect_type == EffectType.SHIELD and remaining_damage > 0:
+                remaining_damage = effect.reduce_shield(remaining_damage)
+
+        # Apply remaining damage to HP
+        hp_damage = min(remaining_damage, self.current_hp)
+        self.current_hp -= hp_damage
+
+        return hp_damage
+
+    def heal(self, amount: int) -> int:
+        """
+        Heal this combatant.
+
+        Args:
+            amount: Amount to heal
+
+        Returns:
+            Actual amount healed (capped at max_hp)
+        """
+        old_hp = self.current_hp
+        self.current_hp = min(self.max_hp, self.current_hp + amount)
+        return self.current_hp - old_hp
+
+    def restore_mana(self, amount: int) -> int:
+        """
+        Restore mana to this combatant.
+
+        Args:
+            amount: Amount to restore
+
+        Returns:
+            Actual amount restored (capped at max_mp)
+        """
+        old_mp = self.current_mp
+        self.current_mp = min(self.max_mp, self.current_mp + amount)
+        return self.current_mp - old_mp
+
+    def can_use_ability(self, ability_id: str, ability: Ability) -> bool:
+        """
+        Check if ability can be used right now.
+
+        Args:
+            ability_id: Ability identifier
+            ability: Ability instance
+
+        Returns:
+            True if ability can be used, False otherwise
+        """
+        # Check if ability is available to this combatant
+        if ability_id not in self.abilities:
+            return False
+
+        # Check mana cost
+        if self.current_mp < ability.mana_cost:
+            return False
+
+        # Check cooldown
+        if ability_id in self.cooldowns and self.cooldowns[ability_id] > 0:
+            return False
+
+        return True
+
+    def use_ability_cost(self, ability: Ability, ability_id: str) -> None:
+        """
+        Apply the costs of using an ability (mana, cooldown).
+
+        Args:
+            ability: Ability being used
+            ability_id: Ability identifier
+        """
+        # Consume mana
+        self.current_mp -= ability.mana_cost
+
+        # Set cooldown
+        if ability.cooldown > 0:
+            self.cooldowns[ability_id] = ability.cooldown
+
+    def tick_effects(self) -> List[Dict[str, Any]]:
+        """
+        Process all active effects for this turn.
+
+        Returns:
+            List of effect tick results
+        """
+        results = []
+        expired_effects = []
+
+        for effect in self.active_effects:
+            result = effect.tick()
+
+            # Apply effect results
+            if effect.effect_type == EffectType.DOT:
+                self.take_damage(result["value"])
+            elif effect.effect_type == EffectType.HOT:
+                self.heal(result["value"])
+
+            results.append(result)
+
+            # Mark expired effects for removal
+            if result.get("expired", False):
+                expired_effects.append(effect)
+
+        # Remove expired effects
+        for effect in expired_effects:
+            self.active_effects.remove(effect)
+
+        return results
+
+    def tick_cooldowns(self) -> None:
+        """Reduce all ability cooldowns by 1 turn."""
+        for ability_id in list(self.cooldowns.keys()):
+            self.cooldowns[ability_id] -= 1
+            if self.cooldowns[ability_id] <= 0:
+                del self.cooldowns[ability_id]
+
+    def add_effect(self, effect: Effect) -> None:
+        """
+        Add an effect to this combatant.
+
+        If the same effect already exists, stack it instead.
+
+        Args:
+            effect: Effect to add
+        """
+        # Check if effect already exists
+        for existing in self.active_effects:
+            if existing.name == effect.name and existing.effect_type == effect.effect_type:
+                # Stack the effect
+                existing.apply_stack(effect.duration)
+                return
+
+        # New effect, add it
+        self.active_effects.append(effect)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize combatant to dictionary."""
+        return {
+            "combatant_id": self.combatant_id,
+            "name": self.name,
+            "is_player": self.is_player,
+            "current_hp": self.current_hp,
+            "max_hp": self.max_hp,
+            "current_mp": self.current_mp,
+            "max_mp": self.max_mp,
+            "stats": self.stats.to_dict(),
+            "active_effects": [e.to_dict() for e in self.active_effects],
+            "abilities": self.abilities,
+            "cooldowns": self.cooldowns,
+            "initiative": self.initiative,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Combatant':
+        """Deserialize combatant from dictionary."""
+        stats = Stats.from_dict(data["stats"])
+        active_effects = [Effect.from_dict(e) for e in data.get("active_effects", [])]
+
+        return cls(
+            combatant_id=data["combatant_id"],
+            name=data["name"],
+            is_player=data["is_player"],
+            current_hp=data["current_hp"],
+            max_hp=data["max_hp"],
+            current_mp=data["current_mp"],
+            max_mp=data["max_mp"],
+            stats=stats,
+            active_effects=active_effects,
+            abilities=data.get("abilities", []),
+            cooldowns=data.get("cooldowns", {}),
+            initiative=data.get("initiative", 0),
+        )
+
+
+@dataclass
+class CombatEncounter:
+    """
+    Represents a combat encounter state.
+
+    Manages turn order, combatants, combat log, and victory/defeat conditions.
+
+    Attributes:
+        encounter_id: Unique identifier
+        combatants: All fighters in this combat
+        turn_order: Combatant IDs sorted by initiative (highest first)
+        current_turn_index: Index in turn_order for current turn
+        round_number: Current round (increments each full turn cycle)
+        combat_log: History of all actions taken
+        status: Current combat status (active, victory, defeat, fled)
+    """
+
+    encounter_id: str
+    combatants: List[Combatant] = field(default_factory=list)
+    turn_order: List[str] = field(default_factory=list)
+    current_turn_index: int = 0
+    round_number: int = 1
+    combat_log: List[Dict[str, Any]] = field(default_factory=list)
+    status: CombatStatus = CombatStatus.ACTIVE
+
+    def initialize_combat(self) -> None:
+        """
+        Initialize combat by rolling initiative and setting turn order.
+
+        Initiative: d20 + dexterity bonus
+        """
+        # Roll initiative for all combatants
+        for combatant in self.combatants:
+            # d20 + dexterity bonus
+            roll = random.randint(1, 20)
+            dex_bonus = combatant.stats.dexterity // 2
+            combatant.initiative = roll + dex_bonus
+
+        # Sort combatants by initiative (highest first)
+        sorted_combatants = sorted(self.combatants, key=lambda c: c.initiative, reverse=True)
+        self.turn_order = [c.combatant_id for c in sorted_combatants]
+
+        self.log_action("combat_start", None, f"Combat begins! Round {self.round_number}")
+
+    def get_current_combatant(self) -> Optional[Combatant]:
+        """Get the combatant whose turn it currently is."""
+        if not self.turn_order:
+            return None
+
+        current_id = self.turn_order[self.current_turn_index]
+        return self.get_combatant(current_id)
+
+    def get_combatant(self, combatant_id: str) -> Optional[Combatant]:
+        """Get a combatant by ID."""
+        for combatant in self.combatants:
+            if combatant.combatant_id == combatant_id:
+                return combatant
+        return None
+
+    def advance_turn(self) -> None:
+        """Advance to the next combatant's turn."""
+        self.current_turn_index += 1
+
+        # If we've cycled through all combatants, start a new round
+        if self.current_turn_index >= len(self.turn_order):
+            self.current_turn_index = 0
+            self.round_number += 1
+            self.log_action("round_start", None, f"Round {self.round_number} begins")
+
+    def start_turn(self) -> List[Dict[str, Any]]:
+        """
+        Process the start of a turn.
+
+        - Tick all effects on current combatant
+        - Tick cooldowns
+        - Check for stun
+
+        Returns:
+            List of effect tick results
+        """
+        combatant = self.get_current_combatant()
+        if not combatant:
+            return []
+
+        # Process effects
+        effect_results = combatant.tick_effects()
+
+        # Reduce cooldowns
+        combatant.tick_cooldowns()
+
+        return effect_results
+
+    def check_end_condition(self) -> CombatStatus:
+        """
+        Check if combat should end.
+
+        Victory: All enemy combatants dead
+        Defeat: All player combatants dead
+
+        Returns:
+            Updated combat status
+        """
+        players_alive = any(c.is_alive() and c.is_player for c in self.combatants)
+        enemies_alive = any(c.is_alive() and not c.is_player for c in self.combatants)
+
+        if not enemies_alive and players_alive:
+            self.status = CombatStatus.VICTORY
+            self.log_action("combat_end", None, "Victory! All enemies defeated!")
+        elif not players_alive:
+            self.status = CombatStatus.DEFEAT
+            self.log_action("combat_end", None, "Defeat! All players have fallen!")
+
+        return self.status
+
+    def log_action(self, action_type: str, combatant_id: Optional[str], message: str, details: Optional[Dict[str, Any]] = None) -> None:
+        """
+        Log a combat action.
+
+        Args:
+            action_type: Type of action (attack, spell, item_use, etc.)
+            combatant_id: ID of acting combatant (or None for system messages)
+            message: Human-readable message
+            details: Additional action details
+        """
+        entry = {
+            "round": self.round_number,
+            "action_type": action_type,
+            "combatant_id": combatant_id,
+            "message": message,
+            "details": details or {},
+        }
+        self.combat_log.append(entry)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize combat encounter to dictionary."""
+        return {
+            "encounter_id": self.encounter_id,
+            "combatants": [c.to_dict() for c in self.combatants],
+            "turn_order": self.turn_order,
+            "current_turn_index": self.current_turn_index,
+            "round_number": self.round_number,
+            "combat_log": self.combat_log,
+            "status": self.status.value,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'CombatEncounter':
+        """Deserialize combat encounter from dictionary."""
+        combatants = [Combatant.from_dict(c) for c in data.get("combatants", [])]
+        status = CombatStatus(data.get("status", "active"))
+
+        return cls(
+            encounter_id=data["encounter_id"],
+            combatants=combatants,
+            turn_order=data.get("turn_order", []),
+            current_turn_index=data.get("current_turn_index", 0),
+            round_number=data.get("round_number", 1),
+            combat_log=data.get("combat_log", []),
+            status=status,
+        )

api/app/models/effects.py

@@ -0,0 +1,208 @@
+"""
+Effect system for temporary status modifiers in combat.
+
+This module defines the Effect dataclass which represents temporary buffs,
+debuffs, damage over time, healing over time, stuns, and shields.
+"""
+
+from dataclasses import dataclass, asdict
+from typing import Dict, Any, Optional
+from app.models.enums import EffectType, StatType
+
+
+@dataclass
+class Effect:
+    """
+    Represents a temporary effect applied to a combatant.
+
+    Effects are processed at the start of each turn via the tick() method.
+    They can stack up to max_stacks, and duration refreshes on re-application.
+
+    Attributes:
+        effect_id: Unique identifier for this effect instance
+        name: Display name of the effect
+        effect_type: Type of effect (BUFF, DEBUFF, DOT, HOT, STUN, SHIELD)
+        duration: Turns remaining before effect expires
+        power: Damage/healing per turn OR stat modifier amount
+        stat_affected: Which stat is modified (for BUFF/DEBUFF only)
+        stacks: Number of times this effect has been stacked
+        max_stacks: Maximum number of stacks allowed (default 5)
+        source: Who/what applied this effect (character_id or ability_id)
+    """
+
+    effect_id: str
+    name: str
+    effect_type: EffectType
+    duration: int
+    power: int
+    stat_affected: Optional[StatType] = None
+    stacks: int = 1
+    max_stacks: int = 5
+    source: str = ""
+
+    def tick(self) -> Dict[str, Any]:
+        """
+        Process one turn of this effect.
+
+        Returns a dictionary describing what happened this turn, including:
+        - effect_name: Name of the effect
+        - effect_type: Type of effect
+        - value: Damage dealt (DOT) or healing done (HOT)
+        - shield_remaining: Current shield strength (SHIELD only)
+        - stunned: True if this is a stun effect (STUN only)
+        - stat_modifier: Amount stats are modified (BUFF/DEBUFF only)
+        - expired: True if effect duration reached 0
+
+        Returns:
+            Dictionary with effect processing results
+        """
+        result = {
+            "effect_name": self.name,
+            "effect_type": self.effect_type.value,
+            "value": 0,
+            "expired": False,
+        }
+
+        # Process effect based on type
+        if self.effect_type == EffectType.DOT:
+            # Damage over time: deal damage equal to power × stacks
+            result["value"] = self.power * self.stacks
+            result["message"] = f"{self.name} deals {result['value']} damage"
+
+        elif self.effect_type == EffectType.HOT:
+            # Heal over time: heal equal to power × stacks
+            result["value"] = self.power * self.stacks
+            result["message"] = f"{self.name} heals {result['value']} HP"
+
+        elif self.effect_type == EffectType.STUN:
+            # Stun: prevents actions this turn
+            result["stunned"] = True
+            result["message"] = f"{self.name} prevents actions"
+
+        elif self.effect_type == EffectType.SHIELD:
+            # Shield: absorbs damage (power × stacks = shield strength)
+            result["shield_remaining"] = self.power * self.stacks
+            result["message"] = f"{self.name} absorbs up to {result['shield_remaining']} damage"
+
+        elif self.effect_type in [EffectType.BUFF, EffectType.DEBUFF]:
+            # Buff/Debuff: modify stats
+            result["stat_affected"] = self.stat_affected.value if self.stat_affected else None
+            result["stat_modifier"] = self.power * self.stacks
+            if self.effect_type == EffectType.BUFF:
+                result["message"] = f"{self.name} increases {result['stat_affected']} by {result['stat_modifier']}"
+            else:
+                result["message"] = f"{self.name} decreases {result['stat_affected']} by {result['stat_modifier']}"
+
+        # Decrease duration
+        self.duration -= 1
+        if self.duration <= 0:
+            result["expired"] = True
+            result["message"] = f"{self.name} has expired"
+
+        return result
+
+    def apply_stack(self, additional_duration: int = 0) -> None:
+        """
+        Apply an additional stack of this effect.
+
+        Increases stack count (up to max_stacks) and refreshes duration.
+        If additional_duration is provided, it's added to current duration.
+
+        Args:
+            additional_duration: Extra turns to add (default 0 = refresh only)
+        """
+        if self.stacks < self.max_stacks:
+            self.stacks += 1
+
+        # Refresh duration or extend it
+        if additional_duration > 0:
+            self.duration = max(self.duration, additional_duration)
+        else:
+            # Find the base duration (current + turns already consumed)
+            # For refresh behavior, we'd need to store original_duration
+            # For now, just use the provided duration
+            pass
+
+    def reduce_shield(self, damage: int) -> int:
+        """
+        Reduce shield strength by damage amount.
+
+        Only applicable for SHIELD effects. Returns remaining damage after shield.
+
+        Args:
+            damage: Amount of damage to absorb
+
+        Returns:
+            Remaining damage after shield absorption
+        """
+        if self.effect_type != EffectType.SHIELD:
+            return damage
+
+        shield_strength = self.power * self.stacks
+        if damage >= shield_strength:
+            # Shield breaks completely
+            remaining_damage = damage - shield_strength
+            self.power = 0  # Shield depleted
+            self.duration = 0  # Effect expires
+            return remaining_damage
+        else:
+            # Shield partially absorbs damage
+            damage_per_stack = damage / self.stacks
+            self.power = max(0, int(self.power - damage_per_stack))
+            return 0
+
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Serialize effect to a dictionary.
+
+        Returns:
+            Dictionary containing all effect data
+        """
+        data = asdict(self)
+        data["effect_type"] = self.effect_type.value
+        if self.stat_affected:
+            data["stat_affected"] = self.stat_affected.value
+        return data
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Effect':
+        """
+        Deserialize effect from a dictionary.
+
+        Args:
+            data: Dictionary containing effect data
+
+        Returns:
+            Effect instance
+        """
+        # Convert string values back to enums
+        effect_type = EffectType(data["effect_type"])
+        stat_affected = StatType(data["stat_affected"]) if data.get("stat_affected") else None
+
+        return cls(
+            effect_id=data["effect_id"],
+            name=data["name"],
+            effect_type=effect_type,
+            duration=data["duration"],
+            power=data["power"],
+            stat_affected=stat_affected,
+            stacks=data.get("stacks", 1),
+            max_stacks=data.get("max_stacks", 5),
+            source=data.get("source", ""),
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the effect."""
+        if self.effect_type in [EffectType.BUFF, EffectType.DEBUFF]:
+            return (
+                f"Effect({self.name}, {self.effect_type.value}, "
+                f"{self.stat_affected.value if self.stat_affected else 'N/A'} "
+                f"{'+' if self.effect_type == EffectType.BUFF else '-'}{self.power * self.stacks}, "
+                f"{self.duration}t, {self.stacks}x)"
+            )
+        else:
+            return (
+                f"Effect({self.name}, {self.effect_type.value}, "
+                f"power={self.power * self.stacks}, "
+                f"duration={self.duration}t, stacks={self.stacks}x)"
+            )

api/app/models/enums.py

@@ -0,0 +1,113 @@
+"""
+Enumeration types for the Code of Conquest game system.
+
+This module defines all enum types used throughout the data models to ensure
+type safety and prevent invalid values.
+"""
+
+from enum import Enum
+
+
+class EffectType(Enum):
+    """Types of effects that can be applied to combatants."""
+
+    BUFF = "buff"           # Temporarily increase stats
+    DEBUFF = "debuff"       # Temporarily decrease stats
+    DOT = "dot"             # Damage over time (poison, bleed, burn)
+    HOT = "hot"             # Heal over time (regeneration)
+    STUN = "stun"           # Prevent actions (skip turn)
+    SHIELD = "shield"       # Absorb damage before HP loss
+
+
+class DamageType(Enum):
+    """Types of damage that can be dealt in combat."""
+
+    PHYSICAL = "physical"   # Standard weapon damage
+    FIRE = "fire"           # Fire-based magic damage
+    ICE = "ice"             # Ice-based magic damage
+    LIGHTNING = "lightning" # Lightning-based magic damage
+    HOLY = "holy"           # Holy/divine damage
+    SHADOW = "shadow"       # Dark/shadow magic damage
+    POISON = "poison"       # Poison damage (usually DoT)
+
+
+class ItemType(Enum):
+    """Categories of items in the game."""
+
+    WEAPON = "weapon"           # Adds damage, may have special effects
+    ARMOR = "armor"             # Adds defense/resistance
+    CONSUMABLE = "consumable"   # One-time use (potions, scrolls)
+    QUEST_ITEM = "quest_item"   # Story-related, non-tradeable
+
+
+class StatType(Enum):
+    """Character attribute types."""
+
+    STRENGTH = "strength"           # Physical power
+    DEXTERITY = "dexterity"         # Agility and precision
+    CONSTITUTION = "constitution"   # Endurance and health
+    INTELLIGENCE = "intelligence"   # Magical power
+    WISDOM = "wisdom"               # Perception and insight
+    CHARISMA = "charisma"           # Social influence
+
+
+class AbilityType(Enum):
+    """Categories of abilities that can be used in combat or exploration."""
+
+    ATTACK = "attack"           # Basic physical attack
+    SPELL = "spell"             # Magical spell
+    SKILL = "skill"             # Special class ability
+    ITEM_USE = "item_use"       # Using a consumable item
+    DEFEND = "defend"           # Defensive action
+
+
+class CombatStatus(Enum):
+    """Status of a combat encounter."""
+
+    ACTIVE = "active"       # Combat is ongoing
+    VICTORY = "victory"     # Player(s) won
+    DEFEAT = "defeat"       # Player(s) lost
+    FLED = "fled"           # Player(s) escaped
+
+
+class SessionStatus(Enum):
+    """Status of a game session."""
+
+    ACTIVE = "active"           # Session is ongoing
+    COMPLETED = "completed"     # Session ended normally
+    TIMEOUT = "timeout"         # Session ended due to inactivity
+
+
+class ListingStatus(Enum):
+    """Status of a marketplace listing."""
+
+    ACTIVE = "active"       # Listing is live
+    SOLD = "sold"           # Item has been sold
+    EXPIRED = "expired"     # Listing time ran out
+    REMOVED = "removed"     # Seller cancelled listing
+
+
+class ListingType(Enum):
+    """Type of marketplace listing."""
+
+    AUCTION = "auction"             # Bidding system
+    FIXED_PRICE = "fixed_price"     # Immediate purchase at set price
+
+
+class SessionType(Enum):
+    """Type of game session."""
+
+    SOLO = "solo"               # Single-player session
+    MULTIPLAYER = "multiplayer" # Multi-player party session
+
+
+class LocationType(Enum):
+    """Types of locations in the game world."""
+
+    TOWN = "town"               # Town or city
+    TAVERN = "tavern"           # Tavern or inn
+    WILDERNESS = "wilderness"   # Outdoor wilderness areas
+    DUNGEON = "dungeon"         # Underground dungeons/caves
+    RUINS = "ruins"             # Ancient ruins
+    LIBRARY = "library"         # Library or archive
+    SAFE_AREA = "safe_area"     # Safe rest areas

api/app/models/items.py

@@ -0,0 +1,196 @@
+"""
+Item system for equipment, consumables, and quest items.
+
+This module defines the Item dataclass representing all types of items in the game,
+including weapons, armor, consumables, and quest items.
+"""
+
+from dataclasses import dataclass, field, asdict
+from typing import Dict, Any, List, Optional
+
+from app.models.enums import ItemType, DamageType
+from app.models.effects import Effect
+
+
+@dataclass
+class Item:
+    """
+    Represents an item in the game (weapon, armor, consumable, or quest item).
+
+    Items can provide passive stat bonuses when equipped, have weapon/armor stats,
+    or provide effects when consumed.
+
+    Attributes:
+        item_id: Unique identifier
+        name: Display name
+        item_type: Category (weapon, armor, consumable, quest_item)
+        description: Item lore and information
+        value: Gold value for buying/selling
+        is_tradeable: Whether item can be sold on marketplace
+        stat_bonuses: Passive bonuses to stats when equipped
+                     Example: {"strength": 5, "constitution": 3}
+        effects_on_use: Effects applied when consumed (consumables only)
+
+        Weapon-specific attributes:
+        damage: Base weapon damage
+        damage_type: Type of damage (physical, fire, etc.)
+        crit_chance: Probability of critical hit (0.0 to 1.0)
+        crit_multiplier: Damage multiplier on critical hit
+
+        Armor-specific attributes:
+        defense: Physical defense bonus
+        resistance: Magical resistance bonus
+
+        Requirements (future):
+        required_level: Minimum character level to use
+        required_class: Class restriction (if any)
+    """
+
+    item_id: str
+    name: str
+    item_type: ItemType
+    description: str
+    value: int = 0
+    is_tradeable: bool = True
+
+    # Passive bonuses (equipment)
+    stat_bonuses: Dict[str, int] = field(default_factory=dict)
+
+    # Active effects (consumables)
+    effects_on_use: List[Effect] = field(default_factory=list)
+
+    # Weapon-specific
+    damage: int = 0
+    damage_type: Optional[DamageType] = None
+    crit_chance: float = 0.05  # 5% default critical hit chance
+    crit_multiplier: float = 2.0  # 2x damage on critical hit
+
+    # Armor-specific
+    defense: int = 0
+    resistance: int = 0
+
+    # Requirements (future expansion)
+    required_level: int = 1
+    required_class: Optional[str] = None
+
+    def is_weapon(self) -> bool:
+        """Check if this item is a weapon."""
+        return self.item_type == ItemType.WEAPON
+
+    def is_armor(self) -> bool:
+        """Check if this item is armor."""
+        return self.item_type == ItemType.ARMOR
+
+    def is_consumable(self) -> bool:
+        """Check if this item is a consumable."""
+        return self.item_type == ItemType.CONSUMABLE
+
+    def is_quest_item(self) -> bool:
+        """Check if this item is a quest item."""
+        return self.item_type == ItemType.QUEST_ITEM
+
+    def can_equip(self, character_level: int, character_class: Optional[str] = None) -> bool:
+        """
+        Check if a character can equip this item.
+
+        Args:
+            character_level: Character's current level
+            character_class: Character's class (if class restrictions exist)
+
+        Returns:
+            True if item can be equipped, False otherwise
+        """
+        # Check level requirement
+        if character_level < self.required_level:
+            return False
+
+        # Check class requirement
+        if self.required_class and character_class != self.required_class:
+            return False
+
+        return True
+
+    def get_total_stat_bonus(self, stat_name: str) -> int:
+        """
+        Get the total bonus for a specific stat from this item.
+
+        Args:
+            stat_name: Name of the stat (e.g., "strength", "intelligence")
+
+        Returns:
+            Bonus value for that stat (0 if not present)
+        """
+        return self.stat_bonuses.get(stat_name, 0)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Serialize item to a dictionary.
+
+        Returns:
+            Dictionary containing all item data
+        """
+        data = asdict(self)
+        data["item_type"] = self.item_type.value
+        if self.damage_type:
+            data["damage_type"] = self.damage_type.value
+        data["effects_on_use"] = [effect.to_dict() for effect in self.effects_on_use]
+        return data
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Item':
+        """
+        Deserialize item from a dictionary.
+
+        Args:
+            data: Dictionary containing item data
+
+        Returns:
+            Item instance
+        """
+        # Convert string values back to enums
+        item_type = ItemType(data["item_type"])
+        damage_type = DamageType(data["damage_type"]) if data.get("damage_type") else None
+
+        # Deserialize effects
+        effects = []
+        if "effects_on_use" in data and data["effects_on_use"]:
+            effects = [Effect.from_dict(e) for e in data["effects_on_use"]]
+
+        return cls(
+            item_id=data["item_id"],
+            name=data["name"],
+            item_type=item_type,
+            description=data["description"],
+            value=data.get("value", 0),
+            is_tradeable=data.get("is_tradeable", True),
+            stat_bonuses=data.get("stat_bonuses", {}),
+            effects_on_use=effects,
+            damage=data.get("damage", 0),
+            damage_type=damage_type,
+            crit_chance=data.get("crit_chance", 0.05),
+            crit_multiplier=data.get("crit_multiplier", 2.0),
+            defense=data.get("defense", 0),
+            resistance=data.get("resistance", 0),
+            required_level=data.get("required_level", 1),
+            required_class=data.get("required_class"),
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the item."""
+        if self.is_weapon():
+            return (
+                f"Item({self.name}, weapon, dmg={self.damage}, "
+                f"crit={self.crit_chance*100:.0f}%, value={self.value}g)"
+            )
+        elif self.is_armor():
+            return (
+                f"Item({self.name}, armor, def={self.defense}, "
+                f"res={self.resistance}, value={self.value}g)"
+            )
+        elif self.is_consumable():
+            return (
+                f"Item({self.name}, consumable, "
+                f"effects={len(self.effects_on_use)}, value={self.value}g)"
+            )
+        else:
+            return f"Item({self.name}, quest_item)"

api/app/models/location.py

@@ -0,0 +1,181 @@
+"""
+Location data models for the world exploration system.
+
+This module defines Location and Region dataclasses that represent structured
+game world data. Locations are loaded from YAML files and provide rich context
+for AI narrative generation.
+"""
+
+from dataclasses import dataclass, field
+from typing import Dict, List, Any, Optional
+
+from app.models.enums import LocationType
+
+
+@dataclass
+class Location:
+    """
+    Represents a defined location in the game world.
+
+    Locations are persistent world entities with NPCs, quests, and connections
+    to other locations. They are loaded from YAML files at runtime.
+
+    Attributes:
+        location_id: Unique identifier (e.g., "crossville_tavern")
+        name: Display name (e.g., "The Rusty Anchor Tavern")
+        location_type: Type of location (town, tavern, wilderness, dungeon, etc.)
+        region_id: Parent region this location belongs to
+        description: Full description for AI narrative context
+        lore: Optional historical/background information
+        ambient_description: Atmospheric details for AI narration
+        available_quests: Quest IDs that can be discovered at this location
+        npc_ids: List of NPC IDs present at this location
+        discoverable_locations: Location IDs that can be revealed from here
+        is_starting_location: Whether this is a valid origin starting point
+        tags: Additional metadata tags for filtering/categorization
+    """
+
+    location_id: str
+    name: str
+    location_type: LocationType
+    region_id: str
+    description: str
+    lore: Optional[str] = None
+    ambient_description: Optional[str] = None
+    available_quests: List[str] = field(default_factory=list)
+    npc_ids: List[str] = field(default_factory=list)
+    discoverable_locations: List[str] = field(default_factory=list)
+    is_starting_location: bool = False
+    tags: List[str] = field(default_factory=list)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Serialize location to dictionary for JSON responses.
+
+        Returns:
+            Dictionary containing all location data
+        """
+        return {
+            "location_id": self.location_id,
+            "name": self.name,
+            "location_type": self.location_type.value,
+            "region_id": self.region_id,
+            "description": self.description,
+            "lore": self.lore,
+            "ambient_description": self.ambient_description,
+            "available_quests": self.available_quests,
+            "npc_ids": self.npc_ids,
+            "discoverable_locations": self.discoverable_locations,
+            "is_starting_location": self.is_starting_location,
+            "tags": self.tags,
+        }
+
+    def to_story_dict(self) -> Dict[str, Any]:
+        """
+        Serialize location for AI narrative context.
+
+        Returns a trimmed version with only narrative-relevant data
+        to reduce token usage in AI prompts.
+
+        Returns:
+            Dictionary containing story-relevant location data
+        """
+        return {
+            "name": self.name,
+            "type": self.location_type.value,
+            "description": self.description,
+            "ambient": self.ambient_description,
+            "lore": self.lore,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Location':
+        """
+        Deserialize location from dictionary.
+
+        Args:
+            data: Dictionary containing location data (from YAML or JSON)
+
+        Returns:
+            Location instance
+        """
+        # Handle location_type - can be string or LocationType enum
+        location_type = data.get("location_type", "town")
+        if isinstance(location_type, str):
+            location_type = LocationType(location_type)
+
+        return cls(
+            location_id=data["location_id"],
+            name=data["name"],
+            location_type=location_type,
+            region_id=data["region_id"],
+            description=data["description"],
+            lore=data.get("lore"),
+            ambient_description=data.get("ambient_description"),
+            available_quests=data.get("available_quests", []),
+            npc_ids=data.get("npc_ids", []),
+            discoverable_locations=data.get("discoverable_locations", []),
+            is_starting_location=data.get("is_starting_location", False),
+            tags=data.get("tags", []),
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the location."""
+        return f"Location({self.location_id}, {self.name}, {self.location_type.value})"
+
+
+@dataclass
+class Region:
+    """
+    Represents a geographical region containing multiple locations.
+
+    Regions group related locations together for organizational purposes
+    and can contain region-wide lore or events.
+
+    Attributes:
+        region_id: Unique identifier (e.g., "crossville")
+        name: Display name (e.g., "Crossville Province")
+        description: Region overview and atmosphere
+        location_ids: List of all location IDs in this region
+    """
+
+    region_id: str
+    name: str
+    description: str
+    location_ids: List[str] = field(default_factory=list)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Serialize region to dictionary.
+
+        Returns:
+            Dictionary containing all region data
+        """
+        return {
+            "region_id": self.region_id,
+            "name": self.name,
+            "description": self.description,
+            "location_ids": self.location_ids,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Region':
+        """
+        Deserialize region from dictionary.
+
+        Args:
+            data: Dictionary containing region data
+
+        Returns:
+            Region instance
+        """
+        return cls(
+            region_id=data["region_id"],
+            name=data["name"],
+            description=data["description"],
+            location_ids=data.get("location_ids", []),
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the region."""
+        return f"Region({self.region_id}, {self.name}, {len(self.location_ids)} locations)"

api/app/models/marketplace.py

@@ -0,0 +1,401 @@
+"""
+Marketplace and economy data models.
+
+This module defines the marketplace-related dataclasses including
+MarketplaceListing, Bid, Transaction, and ShopItem for the player economy.
+"""
+
+from dataclasses import dataclass, field, asdict
+from typing import Dict, Any, List, Optional
+from datetime import datetime
+
+from app.models.items import Item
+from app.models.enums import ListingType, ListingStatus
+
+
+@dataclass
+class Bid:
+    """
+    Represents a bid on an auction listing.
+
+    Attributes:
+        bidder_id: User ID of the bidder
+        bidder_name: Character name of the bidder
+        amount: Bid amount in gold
+        timestamp: ISO timestamp of when bid was placed
+    """
+
+    bidder_id: str
+    bidder_name: str
+    amount: int
+    timestamp: str = ""
+
+    def __post_init__(self):
+        """Initialize timestamp if not provided."""
+        if not self.timestamp:
+            self.timestamp = datetime.utcnow().isoformat()
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize bid to dictionary."""
+        return asdict(self)
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Bid':
+        """Deserialize bid from dictionary."""
+        return cls(
+            bidder_id=data["bidder_id"],
+            bidder_name=data["bidder_name"],
+            amount=data["amount"],
+            timestamp=data.get("timestamp", ""),
+        )
+
+
+@dataclass
+class MarketplaceListing:
+    """
+    Represents an item listing on the player marketplace.
+
+    Supports both fixed-price and auction-style listings.
+
+    Attributes:
+        listing_id: Unique identifier
+        seller_id: User ID of the seller
+        character_id: Character ID of the seller
+        item_data: Full item details being sold
+        listing_type: "auction" or "fixed_price"
+        price: For fixed_price listings
+        starting_bid: Minimum bid for auction listings
+        current_bid: Current highest bid for auction listings
+        buyout_price: Optional instant-buy price for auctions
+        bids: Bid history for auction listings
+        auction_end: ISO timestamp when auction ends
+        status: Listing status (active, sold, expired, removed)
+        created_at: ISO timestamp of listing creation
+    """
+
+    listing_id: str
+    seller_id: str
+    character_id: str
+    item_data: Item
+    listing_type: ListingType
+    status: ListingStatus = ListingStatus.ACTIVE
+    created_at: str = ""
+
+    # Fixed price fields
+    price: int = 0
+
+    # Auction fields
+    starting_bid: int = 0
+    current_bid: int = 0
+    buyout_price: int = 0
+    bids: List[Bid] = field(default_factory=list)
+    auction_end: str = ""
+
+    def __post_init__(self):
+        """Initialize timestamps if not provided."""
+        if not self.created_at:
+            self.created_at = datetime.utcnow().isoformat()
+
+    def is_auction(self) -> bool:
+        """Check if this is an auction listing."""
+        return self.listing_type == ListingType.AUCTION
+
+    def is_fixed_price(self) -> bool:
+        """Check if this is a fixed-price listing."""
+        return self.listing_type == ListingType.FIXED_PRICE
+
+    def is_active(self) -> bool:
+        """Check if listing is active."""
+        return self.status == ListingStatus.ACTIVE
+
+    def has_ended(self) -> bool:
+        """Check if auction has ended (for auction listings)."""
+        if not self.is_auction() or not self.auction_end:
+            return False
+
+        end_time = datetime.fromisoformat(self.auction_end)
+        return datetime.utcnow() >= end_time
+
+    def can_bid(self, bid_amount: int) -> bool:
+        """
+        Check if a bid amount is valid.
+
+        Args:
+            bid_amount: Proposed bid amount
+
+        Returns:
+            True if bid is valid, False otherwise
+        """
+        if not self.is_auction() or not self.is_active():
+            return False
+
+        if self.has_ended():
+            return False
+
+        # First bid must meet starting bid
+        if not self.bids and bid_amount < self.starting_bid:
+            return False
+
+        # Subsequent bids must exceed current bid
+        if self.bids and bid_amount <= self.current_bid:
+            return False
+
+        return True
+
+    def place_bid(self, bidder_id: str, bidder_name: str, amount: int) -> bool:
+        """
+        Place a bid on this auction.
+
+        Args:
+            bidder_id: User ID of bidder
+            bidder_name: Character name of bidder
+            amount: Bid amount
+
+        Returns:
+            True if bid was accepted, False otherwise
+        """
+        if not self.can_bid(amount):
+            return False
+
+        bid = Bid(
+            bidder_id=bidder_id,
+            bidder_name=bidder_name,
+            amount=amount,
+        )
+
+        self.bids.append(bid)
+        self.current_bid = amount
+        return True
+
+    def buyout(self) -> bool:
+        """
+        Attempt to buy out the auction immediately.
+
+        Returns:
+            True if buyout is available and successful, False otherwise
+        """
+        if not self.is_auction() or not self.buyout_price:
+            return False
+
+        if not self.is_active() or self.has_ended():
+            return False
+
+        self.current_bid = self.buyout_price
+        self.status = ListingStatus.SOLD
+        return True
+
+    def get_winning_bidder(self) -> Optional[Bid]:
+        """
+        Get the current winning bid.
+
+        Returns:
+            Winning Bid or None if no bids
+        """
+        if not self.bids:
+            return None
+
+        # Bids are added chronologically, last one is highest
+        return self.bids[-1]
+
+    def cancel_listing(self) -> bool:
+        """
+        Cancel this listing (seller action).
+
+        Returns:
+            True if successfully cancelled, False if cannot be cancelled
+        """
+        if not self.is_active():
+            return False
+
+        # Cannot cancel auction with bids
+        if self.is_auction() and self.bids:
+            return False
+
+        self.status = ListingStatus.REMOVED
+        return True
+
+    def complete_sale(self) -> None:
+        """Mark listing as sold."""
+        self.status = ListingStatus.SOLD
+
+    def expire_listing(self) -> None:
+        """Mark listing as expired."""
+        self.status = ListingStatus.EXPIRED
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize listing to dictionary."""
+        return {
+            "listing_id": self.listing_id,
+            "seller_id": self.seller_id,
+            "character_id": self.character_id,
+            "item_data": self.item_data.to_dict(),
+            "listing_type": self.listing_type.value,
+            "status": self.status.value,
+            "created_at": self.created_at,
+            "price": self.price,
+            "starting_bid": self.starting_bid,
+            "current_bid": self.current_bid,
+            "buyout_price": self.buyout_price,
+            "bids": [bid.to_dict() for bid in self.bids],
+            "auction_end": self.auction_end,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'MarketplaceListing':
+        """Deserialize listing from dictionary."""
+        item_data = Item.from_dict(data["item_data"])
+        listing_type = ListingType(data["listing_type"])
+        status = ListingStatus(data.get("status", "active"))
+        bids = [Bid.from_dict(b) for b in data.get("bids", [])]
+
+        return cls(
+            listing_id=data["listing_id"],
+            seller_id=data["seller_id"],
+            character_id=data["character_id"],
+            item_data=item_data,
+            listing_type=listing_type,
+            status=status,
+            created_at=data.get("created_at", ""),
+            price=data.get("price", 0),
+            starting_bid=data.get("starting_bid", 0),
+            current_bid=data.get("current_bid", 0),
+            buyout_price=data.get("buyout_price", 0),
+            bids=bids,
+            auction_end=data.get("auction_end", ""),
+        )
+
+
+@dataclass
+class Transaction:
+    """
+    Record of a completed transaction.
+
+    Tracks all sales for auditing and analytics.
+
+    Attributes:
+        transaction_id: Unique identifier
+        buyer_id: User ID of buyer
+        seller_id: User ID of seller
+        listing_id: Marketplace listing ID (if from marketplace)
+        item_data: Item that was sold
+        price: Final sale price in gold
+        timestamp: ISO timestamp of transaction
+        transaction_type: "marketplace_sale", "shop_purchase", etc.
+    """
+
+    transaction_id: str
+    buyer_id: str
+    seller_id: str
+    item_data: Item
+    price: int
+    transaction_type: str
+    listing_id: str = ""
+    timestamp: str = ""
+
+    def __post_init__(self):
+        """Initialize timestamp if not provided."""
+        if not self.timestamp:
+            self.timestamp = datetime.utcnow().isoformat()
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize transaction to dictionary."""
+        return {
+            "transaction_id": self.transaction_id,
+            "buyer_id": self.buyer_id,
+            "seller_id": self.seller_id,
+            "listing_id": self.listing_id,
+            "item_data": self.item_data.to_dict(),
+            "price": self.price,
+            "timestamp": self.timestamp,
+            "transaction_type": self.transaction_type,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Transaction':
+        """Deserialize transaction from dictionary."""
+        item_data = Item.from_dict(data["item_data"])
+
+        return cls(
+            transaction_id=data["transaction_id"],
+            buyer_id=data["buyer_id"],
+            seller_id=data["seller_id"],
+            listing_id=data.get("listing_id", ""),
+            item_data=item_data,
+            price=data["price"],
+            timestamp=data.get("timestamp", ""),
+            transaction_type=data["transaction_type"],
+        )
+
+
+@dataclass
+class ShopItem:
+    """
+    Item sold by NPC shops.
+
+    Attributes:
+        item_id: Item identifier
+        item: Item details
+        stock: Available quantity (-1 = unlimited)
+        price: Fixed gold price
+    """
+
+    item_id: str
+    item: Item
+    stock: int = -1  # -1 = unlimited
+    price: int = 0
+
+    def is_in_stock(self) -> bool:
+        """Check if item is available for purchase."""
+        return self.stock != 0
+
+    def purchase(self, quantity: int = 1) -> bool:
+        """
+        Attempt to purchase from stock.
+
+        Args:
+            quantity: Number of items to purchase
+
+        Returns:
+            True if purchase successful, False if insufficient stock
+        """
+        if self.stock == -1:  # Unlimited stock
+            return True
+
+        if self.stock < quantity:
+            return False
+
+        self.stock -= quantity
+        return True
+
+    def restock(self, quantity: int) -> None:
+        """
+        Add stock to this shop item.
+
+        Args:
+            quantity: Amount to add to stock
+        """
+        if self.stock == -1:  # Unlimited, no need to restock
+            return
+
+        self.stock += quantity
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize shop item to dictionary."""
+        return {
+            "item_id": self.item_id,
+            "item": self.item.to_dict(),
+            "stock": self.stock,
+            "price": self.price,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'ShopItem':
+        """Deserialize shop item from dictionary."""
+        item = Item.from_dict(data["item"])
+
+        return cls(
+            item_id=data["item_id"],
+            item=item,
+            stock=data.get("stock", -1),
+            price=data.get("price", 0),
+        )

api/app/models/npc.py

@@ -0,0 +1,477 @@
+"""
+NPC data models for persistent non-player characters.
+
+This module defines NPC and related dataclasses that represent structured
+NPC definitions loaded from YAML files. NPCs have rich personality, knowledge,
+and interaction data that the AI uses for dialogue generation.
+"""
+
+from dataclasses import dataclass, field
+from typing import Dict, List, Any, Optional
+
+
+@dataclass
+class NPCPersonality:
+    """
+    NPC personality definition for AI dialogue generation.
+
+    Provides the AI with guidance on how to roleplay the NPC's character,
+    including their general traits, speaking patterns, and distinctive behaviors.
+
+    Attributes:
+        traits: List of personality descriptors (e.g., "gruff", "kind", "suspicious")
+        speech_style: Description of how the NPC speaks (accent, vocabulary, patterns)
+        quirks: List of distinctive behaviors or habits
+    """
+
+    traits: List[str]
+    speech_style: str
+    quirks: List[str] = field(default_factory=list)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize personality to dictionary."""
+        return {
+            "traits": self.traits,
+            "speech_style": self.speech_style,
+            "quirks": self.quirks,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'NPCPersonality':
+        """Deserialize personality from dictionary."""
+        return cls(
+            traits=data.get("traits", []),
+            speech_style=data.get("speech_style", ""),
+            quirks=data.get("quirks", []),
+        )
+
+
+@dataclass
+class NPCAppearance:
+    """
+    NPC physical description.
+
+    Provides visual context for AI narration and player information.
+
+    Attributes:
+        brief: Short one-line description for lists and quick reference
+        detailed: Optional longer description for detailed encounters
+    """
+
+    brief: str
+    detailed: Optional[str] = None
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize appearance to dictionary."""
+        return {
+            "brief": self.brief,
+            "detailed": self.detailed,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'NPCAppearance':
+        """Deserialize appearance from dictionary."""
+        if isinstance(data, str):
+            # Handle simple string format
+            return cls(brief=data)
+        return cls(
+            brief=data.get("brief", ""),
+            detailed=data.get("detailed"),
+        )
+
+
+@dataclass
+class NPCKnowledgeCondition:
+    """
+    Condition for NPC to reveal secret knowledge.
+
+    Defines when and how an NPC will share information they normally keep hidden.
+    Conditions are evaluated against the character's interaction state.
+
+    Attributes:
+        condition: Expression describing what triggers the reveal
+                  (e.g., "interaction_count >= 3", "relationship_level >= 75")
+        reveals: The information that gets revealed when condition is met
+    """
+
+    condition: str
+    reveals: str
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize condition to dictionary."""
+        return {
+            "condition": self.condition,
+            "reveals": self.reveals,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'NPCKnowledgeCondition':
+        """Deserialize condition from dictionary."""
+        return cls(
+            condition=data.get("condition", ""),
+            reveals=data.get("reveals", ""),
+        )
+
+
+@dataclass
+class NPCKnowledge:
+    """
+    Knowledge an NPC possesses - public and secret.
+
+    Organizes what information an NPC knows and under what circumstances
+    they will share it with players.
+
+    Attributes:
+        public: Knowledge the NPC will freely share with anyone
+        secret: Knowledge the NPC keeps hidden (for AI reference only)
+        will_share_if: Conditional reveals based on character interaction state
+    """
+
+    public: List[str] = field(default_factory=list)
+    secret: List[str] = field(default_factory=list)
+    will_share_if: List[NPCKnowledgeCondition] = field(default_factory=list)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize knowledge to dictionary."""
+        return {
+            "public": self.public,
+            "secret": self.secret,
+            "will_share_if": [c.to_dict() for c in self.will_share_if],
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'NPCKnowledge':
+        """Deserialize knowledge from dictionary."""
+        conditions = [
+            NPCKnowledgeCondition.from_dict(c)
+            for c in data.get("will_share_if", [])
+        ]
+        return cls(
+            public=data.get("public", []),
+            secret=data.get("secret", []),
+            will_share_if=conditions,
+        )
+
+
+@dataclass
+class NPCRelationship:
+    """
+    NPC's relationship with another NPC.
+
+    Defines how this NPC feels about other NPCs in the world,
+    providing context for dialogue and interactions.
+
+    Attributes:
+        npc_id: The other NPC's identifier
+        attitude: How this NPC feels (e.g., "friendly", "distrustful", "romantic")
+        reason: Optional explanation for the attitude
+    """
+
+    npc_id: str
+    attitude: str
+    reason: Optional[str] = None
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize relationship to dictionary."""
+        return {
+            "npc_id": self.npc_id,
+            "attitude": self.attitude,
+            "reason": self.reason,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'NPCRelationship':
+        """Deserialize relationship from dictionary."""
+        return cls(
+            npc_id=data["npc_id"],
+            attitude=data["attitude"],
+            reason=data.get("reason"),
+        )
+
+
+@dataclass
+class NPCInventoryItem:
+    """
+    Item an NPC has for sale.
+
+    Defines items available for purchase from merchant NPCs.
+
+    Attributes:
+        item_id: Reference to item definition
+        price: Cost in gold
+        quantity: Stock count (None = unlimited)
+    """
+
+    item_id: str
+    price: int
+    quantity: Optional[int] = None
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize inventory item to dictionary."""
+        return {
+            "item_id": self.item_id,
+            "price": self.price,
+            "quantity": self.quantity,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'NPCInventoryItem':
+        """Deserialize inventory item from dictionary."""
+        # Handle shorthand format: { item: "ale", price: 2 }
+        item_id = data.get("item_id") or data.get("item", "")
+        return cls(
+            item_id=item_id,
+            price=data.get("price", 0),
+            quantity=data.get("quantity"),
+        )
+
+
+@dataclass
+class NPCDialogueHooks:
+    """
+    Pre-defined dialogue snippets for AI context.
+
+    Provides example phrases the AI can use or adapt to maintain
+    consistent NPC voice across conversations.
+
+    Attributes:
+        greeting: What NPC says when first addressed
+        farewell: What NPC says when conversation ends
+        busy: What NPC says when occupied or dismissive
+        quest_complete: What NPC says when player completes their quest
+    """
+
+    greeting: Optional[str] = None
+    farewell: Optional[str] = None
+    busy: Optional[str] = None
+    quest_complete: Optional[str] = None
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize dialogue hooks to dictionary."""
+        return {
+            "greeting": self.greeting,
+            "farewell": self.farewell,
+            "busy": self.busy,
+            "quest_complete": self.quest_complete,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'NPCDialogueHooks':
+        """Deserialize dialogue hooks from dictionary."""
+        return cls(
+            greeting=data.get("greeting"),
+            farewell=data.get("farewell"),
+            busy=data.get("busy"),
+            quest_complete=data.get("quest_complete"),
+        )
+
+
+@dataclass
+class NPC:
+    """
+    Persistent NPC definition.
+
+    NPCs are fixed to locations and have rich personality, knowledge,
+    and interaction data used by the AI for dialogue generation.
+
+    Attributes:
+        npc_id: Unique identifier (e.g., "npc_grom_001")
+        name: Display name (e.g., "Grom Ironbeard")
+        role: NPC's job/title (e.g., "bartender", "blacksmith")
+        location_id: ID of location where this NPC resides
+        personality: Personality traits and speech patterns
+        appearance: Physical description
+        knowledge: What the NPC knows (public and secret)
+        relationships: How NPC feels about other NPCs
+        inventory_for_sale: Items NPC sells (if merchant)
+        dialogue_hooks: Pre-defined dialogue snippets
+        quest_giver_for: Quest IDs this NPC can give
+        reveals_locations: Location IDs this NPC can unlock through conversation
+        tags: Metadata tags for filtering (e.g., "merchant", "quest_giver")
+    """
+
+    npc_id: str
+    name: str
+    role: str
+    location_id: str
+    personality: NPCPersonality
+    appearance: NPCAppearance
+    knowledge: Optional[NPCKnowledge] = None
+    relationships: List[NPCRelationship] = field(default_factory=list)
+    inventory_for_sale: List[NPCInventoryItem] = field(default_factory=list)
+    dialogue_hooks: Optional[NPCDialogueHooks] = None
+    quest_giver_for: List[str] = field(default_factory=list)
+    reveals_locations: List[str] = field(default_factory=list)
+    tags: List[str] = field(default_factory=list)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Serialize NPC to dictionary for JSON responses.
+
+        Returns:
+            Dictionary containing all NPC data
+        """
+        return {
+            "npc_id": self.npc_id,
+            "name": self.name,
+            "role": self.role,
+            "location_id": self.location_id,
+            "personality": self.personality.to_dict(),
+            "appearance": self.appearance.to_dict(),
+            "knowledge": self.knowledge.to_dict() if self.knowledge else None,
+            "relationships": [r.to_dict() for r in self.relationships],
+            "inventory_for_sale": [i.to_dict() for i in self.inventory_for_sale],
+            "dialogue_hooks": self.dialogue_hooks.to_dict() if self.dialogue_hooks else None,
+            "quest_giver_for": self.quest_giver_for,
+            "reveals_locations": self.reveals_locations,
+            "tags": self.tags,
+        }
+
+    def to_story_dict(self) -> Dict[str, Any]:
+        """
+        Serialize NPC for AI dialogue context.
+
+        Returns a trimmed version focused on roleplay-relevant data
+        to reduce token usage in AI prompts.
+
+        Returns:
+            Dictionary containing story-relevant NPC data
+        """
+        result = {
+            "name": self.name,
+            "role": self.role,
+            "personality": {
+                "traits": self.personality.traits,
+                "speech_style": self.personality.speech_style,
+                "quirks": self.personality.quirks,
+            },
+            "appearance": self.appearance.brief,
+        }
+
+        # Include dialogue hooks if available
+        if self.dialogue_hooks:
+            result["dialogue_hooks"] = self.dialogue_hooks.to_dict()
+
+        return result
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'NPC':
+        """
+        Deserialize NPC from dictionary.
+
+        Args:
+            data: Dictionary containing NPC data (from YAML or JSON)
+
+        Returns:
+            NPC instance
+        """
+        # Parse personality
+        personality_data = data.get("personality", {})
+        personality = NPCPersonality.from_dict(personality_data)
+
+        # Parse appearance
+        appearance_data = data.get("appearance", {"brief": ""})
+        appearance = NPCAppearance.from_dict(appearance_data)
+
+        # Parse knowledge (optional)
+        knowledge = None
+        if data.get("knowledge"):
+            knowledge = NPCKnowledge.from_dict(data["knowledge"])
+
+        # Parse relationships
+        relationships = [
+            NPCRelationship.from_dict(r)
+            for r in data.get("relationships", [])
+        ]
+
+        # Parse inventory
+        inventory = [
+            NPCInventoryItem.from_dict(i)
+            for i in data.get("inventory_for_sale", [])
+        ]
+
+        # Parse dialogue hooks (optional)
+        dialogue_hooks = None
+        if data.get("dialogue_hooks"):
+            dialogue_hooks = NPCDialogueHooks.from_dict(data["dialogue_hooks"])
+
+        return cls(
+            npc_id=data["npc_id"],
+            name=data["name"],
+            role=data["role"],
+            location_id=data["location_id"],
+            personality=personality,
+            appearance=appearance,
+            knowledge=knowledge,
+            relationships=relationships,
+            inventory_for_sale=inventory,
+            dialogue_hooks=dialogue_hooks,
+            quest_giver_for=data.get("quest_giver_for", []),
+            reveals_locations=data.get("reveals_locations", []),
+            tags=data.get("tags", []),
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the NPC."""
+        return f"NPC({self.npc_id}, {self.name}, {self.role})"
+
+
+@dataclass
+class NPCInteractionState:
+    """
+    Tracks a character's interaction history with an NPC.
+
+    Stored on the Character record to persist relationship data
+    across multiple game sessions.
+
+    Attributes:
+        npc_id: The NPC this state tracks
+        first_met: ISO timestamp of first interaction
+        last_interaction: ISO timestamp of most recent interaction
+        interaction_count: Total number of conversations
+        revealed_secrets: Indices of secrets that have been revealed
+        relationship_level: 0-100 scale (50 is neutral)
+        custom_flags: Arbitrary flags for special conditions
+                     (e.g., {"helped_with_rats": true})
+    """
+
+    npc_id: str
+    first_met: str
+    last_interaction: str
+    interaction_count: int = 0
+    revealed_secrets: List[int] = field(default_factory=list)
+    relationship_level: int = 50
+    custom_flags: Dict[str, Any] = field(default_factory=dict)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize interaction state to dictionary."""
+        return {
+            "npc_id": self.npc_id,
+            "first_met": self.first_met,
+            "last_interaction": self.last_interaction,
+            "interaction_count": self.interaction_count,
+            "revealed_secrets": self.revealed_secrets,
+            "relationship_level": self.relationship_level,
+            "custom_flags": self.custom_flags,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'NPCInteractionState':
+        """Deserialize interaction state from dictionary."""
+        return cls(
+            npc_id=data["npc_id"],
+            first_met=data["first_met"],
+            last_interaction=data["last_interaction"],
+            interaction_count=data.get("interaction_count", 0),
+            revealed_secrets=data.get("revealed_secrets", []),
+            relationship_level=data.get("relationship_level", 50),
+            custom_flags=data.get("custom_flags", {}),
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the interaction state."""
+        return (
+            f"NPCInteractionState({self.npc_id}, "
+            f"interactions={self.interaction_count}, "
+            f"relationship={self.relationship_level})"
+        )

api/app/models/origins.py

@@ -0,0 +1,148 @@
+"""
+Origin data models - character backstory and starting conditions.
+
+Origins are saved to the character and referenced by the AI DM throughout
+the game to create personalized narrative experiences, quest hooks, and
+story-driven interactions.
+"""
+
+from dataclasses import dataclass, field
+from typing import Dict, List, Any
+
+
+@dataclass
+class StartingLocation:
+    """
+    Represents where a character begins their journey.
+
+    Attributes:
+        id: Unique location identifier
+        name: Display name of the location
+        region: Larger geographical area this location belongs to
+        description: Brief description of the location
+    """
+    id: str
+    name: str
+    region: str
+    description: str
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize to dictionary."""
+        return {
+            "id": self.id,
+            "name": self.name,
+            "region": self.region,
+            "description": self.description,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'StartingLocation':
+        """Deserialize from dictionary."""
+        return cls(
+            id=data["id"],
+            name=data["name"],
+            region=data["region"],
+            description=data["description"],
+        )
+
+
+@dataclass
+class StartingBonus:
+    """
+    Represents mechanical benefits from an origin choice.
+
+    Attributes:
+        trait: Name of the trait/ability granted
+        description: What the trait represents narratively
+        effect: Mechanical game effect (stat bonuses, special abilities, etc.)
+    """
+    trait: str
+    description: str
+    effect: str
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize to dictionary."""
+        return {
+            "trait": self.trait,
+            "description": self.description,
+            "effect": self.effect,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'StartingBonus':
+        """Deserialize from dictionary."""
+        return cls(
+            trait=data["trait"],
+            description=data["description"],
+            effect=data["effect"],
+        )
+
+
+@dataclass
+class Origin:
+    """
+    Represents a character's backstory and starting conditions.
+
+    Origins are permanent character attributes that the AI DM uses to
+    create personalized narratives, generate relevant quest hooks, and
+    tailor NPC interactions throughout the game.
+
+    Attributes:
+        id: Unique origin identifier (e.g., "soul_revenant")
+        name: Display name (e.g., "Soul Revenant")
+        description: Full backstory text that explains the origin
+        starting_location: Where the character begins their journey
+        narrative_hooks: List of story elements the AI can reference
+        starting_bonus: Mechanical benefits from this origin
+    """
+    id: str
+    name: str
+    description: str
+    starting_location: StartingLocation
+    narrative_hooks: List[str] = field(default_factory=list)
+    starting_bonus: StartingBonus = None
+
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Serialize origin to dictionary for JSON storage.
+
+        Returns:
+            Dictionary containing all origin data
+        """
+        return {
+            "id": self.id,
+            "name": self.name,
+            "description": self.description,
+            "starting_location": self.starting_location.to_dict(),
+            "narrative_hooks": self.narrative_hooks,
+            "starting_bonus": self.starting_bonus.to_dict() if self.starting_bonus else None,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Origin':
+        """
+        Deserialize origin from dictionary.
+
+        Args:
+            data: Dictionary containing origin data
+
+        Returns:
+            Origin instance
+        """
+        starting_location = StartingLocation.from_dict(data["starting_location"])
+        starting_bonus = None
+        if data.get("starting_bonus"):
+            starting_bonus = StartingBonus.from_dict(data["starting_bonus"])
+
+        return cls(
+            id=data["id"],
+            name=data["name"],
+            description=data["description"],
+            starting_location=starting_location,
+            narrative_hooks=data.get("narrative_hooks", []),
+            starting_bonus=starting_bonus,
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the origin."""
+        return f"Origin({self.name}, starts at {self.starting_location.name})"

api/app/models/session.py

@@ -0,0 +1,411 @@
+"""
+Game session data models.
+
+This module defines the session-related dataclasses including SessionConfig,
+GameState, and GameSession which manage multiplayer party sessions.
+"""
+
+from dataclasses import dataclass, field, asdict
+from typing import Dict, Any, List, Optional
+from datetime import datetime, timezone
+
+from app.models.combat import CombatEncounter
+from app.models.enums import SessionStatus, SessionType
+from app.models.action_prompt import LocationType
+
+
+@dataclass
+class SessionConfig:
+    """
+    Configuration settings for a game session.
+
+    Attributes:
+        min_players: Minimum players required (session ends if below this)
+        timeout_minutes: Inactivity timeout in minutes
+        auto_save_interval: Turns between automatic saves
+    """
+
+    min_players: int = 1
+    timeout_minutes: int = 30
+    auto_save_interval: int = 5
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize configuration to dictionary."""
+        return asdict(self)
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'SessionConfig':
+        """Deserialize configuration from dictionary."""
+        return cls(
+            min_players=data.get("min_players", 1),
+            timeout_minutes=data.get("timeout_minutes", 30),
+            auto_save_interval=data.get("auto_save_interval", 5),
+        )
+
+
+@dataclass
+class GameState:
+    """
+    Current world/quest state for a game session.
+
+    Attributes:
+        current_location: Current location name/ID
+        location_type: Type of current location (town, tavern, wilderness, etc.)
+        discovered_locations: All location IDs the party has visited
+        active_quests: Quest IDs currently in progress
+        world_events: Server-wide events affecting this session
+    """
+
+    current_location: str = "crossville_village"
+    location_type: LocationType = LocationType.TOWN
+    discovered_locations: List[str] = field(default_factory=list)
+    active_quests: List[str] = field(default_factory=list)
+    world_events: List[Dict[str, Any]] = field(default_factory=list)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize game state to dictionary."""
+        return {
+            "current_location": self.current_location,
+            "location_type": self.location_type.value,
+            "discovered_locations": self.discovered_locations,
+            "active_quests": self.active_quests,
+            "world_events": self.world_events,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'GameState':
+        """Deserialize game state from dictionary."""
+        # Handle location_type as either string or enum
+        location_type_value = data.get("location_type", "town")
+        if isinstance(location_type_value, str):
+            location_type = LocationType(location_type_value)
+        else:
+            location_type = location_type_value
+
+        return cls(
+            current_location=data.get("current_location", "crossville_village"),
+            location_type=location_type,
+            discovered_locations=data.get("discovered_locations", []),
+            active_quests=data.get("active_quests", []),
+            world_events=data.get("world_events", []),
+        )
+
+
+@dataclass
+class ConversationEntry:
+    """
+    Single entry in the conversation history.
+
+    Attributes:
+        turn: Turn number
+        character_id: Acting character's ID
+        character_name: Acting character's name
+        action: Player's action/input text
+        dm_response: AI Dungeon Master's response
+        timestamp: ISO timestamp of when entry was created
+        combat_log: Combat actions if any occurred this turn
+        quest_offered: Quest offering info if a quest was offered this turn
+    """
+
+    turn: int
+    character_id: str
+    character_name: str
+    action: str
+    dm_response: str
+    timestamp: str = ""
+    combat_log: List[Dict[str, Any]] = field(default_factory=list)
+    quest_offered: Optional[Dict[str, Any]] = None
+
+    def __post_init__(self):
+        """Initialize timestamp if not provided."""
+        if not self.timestamp:
+            self.timestamp = datetime.now(timezone.utc).isoformat().replace("+00:00", "Z")
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize conversation entry to dictionary."""
+        result = {
+            "turn": self.turn,
+            "character_id": self.character_id,
+            "character_name": self.character_name,
+            "action": self.action,
+            "dm_response": self.dm_response,
+            "timestamp": self.timestamp,
+            "combat_log": self.combat_log,
+        }
+        if self.quest_offered:
+            result["quest_offered"] = self.quest_offered
+        return result
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'ConversationEntry':
+        """Deserialize conversation entry from dictionary."""
+        return cls(
+            turn=data["turn"],
+            character_id=data.get("character_id", ""),
+            character_name=data.get("character_name", ""),
+            action=data["action"],
+            dm_response=data["dm_response"],
+            timestamp=data.get("timestamp", ""),
+            combat_log=data.get("combat_log", []),
+            quest_offered=data.get("quest_offered"),
+        )
+
+
+@dataclass
+class GameSession:
+    """
+    Represents a game session (solo or multiplayer).
+
+    A session can have one or more players (party) and tracks the entire
+    game state including conversation history, combat encounters, and
+    turn order.
+
+    Attributes:
+        session_id: Unique identifier
+        session_type: Type of session (solo or multiplayer)
+        solo_character_id: Character ID for single-player sessions (None for multiplayer)
+        user_id: Owner of the session
+        party_member_ids: Character IDs in this party (multiplayer only)
+        config: Session configuration settings
+        combat_encounter: Current combat (None if not in combat)
+        conversation_history: Turn-by-turn log of actions and DM responses
+        game_state: Current world/quest state
+        turn_order: Character turn order
+        current_turn: Index in turn_order for current turn
+        turn_number: Global turn counter
+        created_at: ISO timestamp of session creation
+        last_activity: ISO timestamp of last action
+        status: Current session status (active, completed, timeout)
+    """
+
+    session_id: str
+    session_type: SessionType = SessionType.SOLO
+    solo_character_id: Optional[str] = None
+    user_id: str = ""
+    party_member_ids: List[str] = field(default_factory=list)
+    config: SessionConfig = field(default_factory=SessionConfig)
+    combat_encounter: Optional[CombatEncounter] = None
+    conversation_history: List[ConversationEntry] = field(default_factory=list)
+    game_state: GameState = field(default_factory=GameState)
+    turn_order: List[str] = field(default_factory=list)
+    current_turn: int = 0
+    turn_number: int = 0
+    created_at: str = ""
+    last_activity: str = ""
+    status: SessionStatus = SessionStatus.ACTIVE
+
+    def __post_init__(self):
+        """Initialize timestamps if not provided."""
+        if not self.created_at:
+            self.created_at = datetime.now(timezone.utc).isoformat().replace("+00:00", "Z")
+        if not self.last_activity:
+            self.last_activity = datetime.now(timezone.utc).isoformat().replace("+00:00", "Z")
+
+    def is_in_combat(self) -> bool:
+        """Check if session is currently in combat."""
+        return self.combat_encounter is not None
+
+    def start_combat(self, encounter: CombatEncounter) -> None:
+        """
+        Start a combat encounter.
+
+        Args:
+            encounter: The combat encounter to begin
+        """
+        self.combat_encounter = encounter
+        self.update_activity()
+
+    def end_combat(self) -> None:
+        """End the current combat encounter."""
+        self.combat_encounter = None
+        self.update_activity()
+
+    def advance_turn(self) -> str:
+        """
+        Advance to the next player's turn.
+
+        Returns:
+            Character ID whose turn it now is
+        """
+        if not self.turn_order:
+            return ""
+
+        self.current_turn = (self.current_turn + 1) % len(self.turn_order)
+        self.turn_number += 1
+        self.update_activity()
+
+        return self.turn_order[self.current_turn]
+
+    def get_current_character_id(self) -> Optional[str]:
+        """Get the character ID whose turn it currently is."""
+        if not self.turn_order:
+            return None
+        return self.turn_order[self.current_turn]
+
+    def add_conversation_entry(self, entry: ConversationEntry) -> None:
+        """
+        Add an entry to the conversation history.
+
+        Args:
+            entry: Conversation entry to add
+        """
+        self.conversation_history.append(entry)
+        self.update_activity()
+
+    def update_activity(self) -> None:
+        """Update the last activity timestamp to now."""
+        self.last_activity = datetime.now(timezone.utc).isoformat().replace("+00:00", "Z")
+
+    def add_party_member(self, character_id: str) -> None:
+        """
+        Add a character to the party.
+
+        Args:
+            character_id: Character ID to add
+        """
+        if character_id not in self.party_member_ids:
+            self.party_member_ids.append(character_id)
+            self.update_activity()
+
+    def remove_party_member(self, character_id: str) -> None:
+        """
+        Remove a character from the party.
+
+        Args:
+            character_id: Character ID to remove
+        """
+        if character_id in self.party_member_ids:
+            self.party_member_ids.remove(character_id)
+            # Also remove from turn order
+            if character_id in self.turn_order:
+                self.turn_order.remove(character_id)
+            self.update_activity()
+
+    def check_timeout(self) -> bool:
+        """
+        Check if session has timed out due to inactivity.
+
+        Returns:
+            True if session should be marked as timed out
+        """
+        if self.status != SessionStatus.ACTIVE:
+            return False
+
+        # Calculate time since last activity
+        last_activity_str = self.last_activity.replace("Z", "+00:00")
+        last_activity_time = datetime.fromisoformat(last_activity_str)
+        now = datetime.now(timezone.utc)
+        elapsed_minutes = (now - last_activity_time).total_seconds() / 60
+
+        if elapsed_minutes >= self.config.timeout_minutes:
+            self.status = SessionStatus.TIMEOUT
+            return True
+
+        return False
+
+    def check_min_players(self) -> bool:
+        """
+        Check if session still has minimum required players.
+
+        Returns:
+            True if session should continue, False if it should end
+        """
+        if len(self.party_member_ids) < self.config.min_players:
+            if self.status == SessionStatus.ACTIVE:
+                self.status = SessionStatus.COMPLETED
+            return False
+        return True
+
+    def is_solo(self) -> bool:
+        """Check if this is a solo session."""
+        return self.session_type == SessionType.SOLO
+
+    def get_character_id(self) -> Optional[str]:
+        """
+        Get the primary character ID for the session.
+
+        For solo sessions, returns solo_character_id.
+        For multiplayer, returns the current character in turn order.
+        """
+        if self.is_solo():
+            return self.solo_character_id
+        return self.get_current_character_id()
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize game session to dictionary."""
+        return {
+            "session_id": self.session_id,
+            "session_type": self.session_type.value,
+            "solo_character_id": self.solo_character_id,
+            "user_id": self.user_id,
+            "party_member_ids": self.party_member_ids,
+            "config": self.config.to_dict(),
+            "combat_encounter": self.combat_encounter.to_dict() if self.combat_encounter else None,
+            "conversation_history": [entry.to_dict() for entry in self.conversation_history],
+            "game_state": self.game_state.to_dict(),
+            "turn_order": self.turn_order,
+            "current_turn": self.current_turn,
+            "turn_number": self.turn_number,
+            "created_at": self.created_at,
+            "last_activity": self.last_activity,
+            "status": self.status.value,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'GameSession':
+        """Deserialize game session from dictionary."""
+        config = SessionConfig.from_dict(data.get("config", {}))
+        game_state = GameState.from_dict(data.get("game_state", {}))
+        conversation_history = [
+            ConversationEntry.from_dict(entry)
+            for entry in data.get("conversation_history", [])
+        ]
+
+        combat_encounter = None
+        if data.get("combat_encounter"):
+            combat_encounter = CombatEncounter.from_dict(data["combat_encounter"])
+
+        status = SessionStatus(data.get("status", "active"))
+
+        # Handle session_type as either string or enum
+        session_type_value = data.get("session_type", "solo")
+        if isinstance(session_type_value, str):
+            session_type = SessionType(session_type_value)
+        else:
+            session_type = session_type_value
+
+        return cls(
+            session_id=data["session_id"],
+            session_type=session_type,
+            solo_character_id=data.get("solo_character_id"),
+            user_id=data.get("user_id", ""),
+            party_member_ids=data.get("party_member_ids", []),
+            config=config,
+            combat_encounter=combat_encounter,
+            conversation_history=conversation_history,
+            game_state=game_state,
+            turn_order=data.get("turn_order", []),
+            current_turn=data.get("current_turn", 0),
+            turn_number=data.get("turn_number", 0),
+            created_at=data.get("created_at", ""),
+            last_activity=data.get("last_activity", ""),
+            status=status,
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the session."""
+        if self.is_solo():
+            return (
+                f"GameSession({self.session_id}, "
+                f"type=solo, "
+                f"char={self.solo_character_id}, "
+                f"turn={self.turn_number}, "
+                f"status={self.status.value})"
+            )
+        return (
+            f"GameSession({self.session_id}, "
+            f"type=multiplayer, "
+            f"party={len(self.party_member_ids)}, "
+            f"turn={self.turn_number}, "
+            f"status={self.status.value})"
+        )

api/app/models/skills.py

@@ -0,0 +1,290 @@
+"""
+Skill tree and character class system.
+
+This module defines the progression system including skill nodes, skill trees,
+and player classes. Characters unlock skills by spending skill points earned
+through leveling.
+"""
+
+from dataclasses import dataclass, field, asdict
+from typing import Dict, Any, List, Optional
+
+from app.models.stats import Stats
+
+
+@dataclass
+class SkillNode:
+    """
+    Represents a single skill in a skill tree.
+
+    Skills can provide passive bonuses, unlock active abilities, or grant
+    access to new features (like equipment types).
+
+    Attributes:
+        skill_id: Unique identifier
+        name: Display name
+        description: What this skill does
+        tier: Skill tier (1-5, where 1 is basic and 5 is master)
+        prerequisites: List of skill_ids that must be unlocked first
+        effects: Dictionary of effects this skill provides
+                Examples:
+                - Passive bonuses: {"strength": 5, "defense": 10}
+                - Ability unlocks: {"unlocks_ability": "shield_bash"}
+                - Feature access: {"unlocks_equipment": "heavy_armor"}
+        unlocked: Current unlock status (used during gameplay)
+    """
+
+    skill_id: str
+    name: str
+    description: str
+    tier: int  # 1-5
+    prerequisites: List[str] = field(default_factory=list)
+    effects: Dict[str, Any] = field(default_factory=dict)
+    unlocked: bool = False
+
+    def has_prerequisites_met(self, unlocked_skills: List[str]) -> bool:
+        """
+        Check if all prerequisites for this skill are met.
+
+        Args:
+            unlocked_skills: List of skill_ids the character has unlocked
+
+        Returns:
+            True if all prerequisites are met, False otherwise
+        """
+        return all(prereq in unlocked_skills for prereq in self.prerequisites)
+
+    def get_stat_bonuses(self) -> Dict[str, int]:
+        """
+        Extract stat bonuses from this skill's effects.
+
+        Returns:
+            Dictionary of stat bonuses (e.g., {"strength": 5, "defense": 3})
+        """
+        bonuses = {}
+        for key, value in self.effects.items():
+            # Look for stat names in effects
+            if key in ["strength", "dexterity", "constitution", "intelligence", "wisdom", "charisma"]:
+                bonuses[key] = value
+            elif key == "defense" or key == "resistance" or key == "hit_points" or key == "mana_points":
+                bonuses[key] = value
+        return bonuses
+
+    def get_unlocked_abilities(self) -> List[str]:
+        """
+        Extract ability IDs unlocked by this skill.
+
+        Returns:
+            List of ability_ids this skill unlocks
+        """
+        abilities = []
+        if "unlocks_ability" in self.effects:
+            ability = self.effects["unlocks_ability"]
+            if isinstance(ability, list):
+                abilities.extend(ability)
+            else:
+                abilities.append(ability)
+        return abilities
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize skill node to dictionary."""
+        return asdict(self)
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'SkillNode':
+        """Deserialize skill node from dictionary."""
+        return cls(
+            skill_id=data["skill_id"],
+            name=data["name"],
+            description=data["description"],
+            tier=data["tier"],
+            prerequisites=data.get("prerequisites", []),
+            effects=data.get("effects", {}),
+            unlocked=data.get("unlocked", False),
+        )
+
+
+@dataclass
+class SkillTree:
+    """
+    Represents a complete skill tree for a character class.
+
+    Each class has 2+ skill trees representing different specializations.
+
+    Attributes:
+        tree_id: Unique identifier
+        name: Display name (e.g., "Shield Bearer", "Pyromancy")
+        description: Theme and purpose of this tree
+        nodes: All skill nodes in this tree (organized by tier)
+    """
+
+    tree_id: str
+    name: str
+    description: str
+    nodes: List[SkillNode] = field(default_factory=list)
+
+    def can_unlock(self, skill_id: str, unlocked_skills: List[str]) -> bool:
+        """
+        Check if a specific skill can be unlocked.
+
+        Validates:
+        1. Skill exists in this tree
+        2. Prerequisites are met
+        3. Tier progression rules (must unlock tier N before tier N+1)
+
+        Args:
+            skill_id: The skill to check
+            unlocked_skills: Currently unlocked skill_ids
+
+        Returns:
+            True if skill can be unlocked, False otherwise
+        """
+        # Find the skill node
+        skill_node = None
+        for node in self.nodes:
+            if node.skill_id == skill_id:
+                skill_node = node
+                break
+
+        if not skill_node:
+            return False  # Skill not in this tree
+
+        # Check if already unlocked
+        if skill_id in unlocked_skills:
+            return False
+
+        # Check prerequisites
+        if not skill_node.has_prerequisites_met(unlocked_skills):
+            return False
+
+        # Check tier progression
+        # Must have at least one skill from previous tier unlocked
+        # (except for tier 1 which is always available)
+        if skill_node.tier > 1:
+            has_previous_tier = False
+            for node in self.nodes:
+                if node.tier == skill_node.tier - 1 and node.skill_id in unlocked_skills:
+                    has_previous_tier = True
+                    break
+            if not has_previous_tier:
+                return False
+
+        return True
+
+    def get_nodes_by_tier(self, tier: int) -> List[SkillNode]:
+        """
+        Get all skill nodes for a specific tier.
+
+        Args:
+            tier: Tier number (1-5)
+
+        Returns:
+            List of SkillNodes at that tier
+        """
+        return [node for node in self.nodes if node.tier == tier]
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize skill tree to dictionary."""
+        data = asdict(self)
+        data["nodes"] = [node.to_dict() for node in self.nodes]
+        return data
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'SkillTree':
+        """Deserialize skill tree from dictionary."""
+        nodes = [SkillNode.from_dict(n) for n in data.get("nodes", [])]
+        return cls(
+            tree_id=data["tree_id"],
+            name=data["name"],
+            description=data["description"],
+            nodes=nodes,
+        )
+
+
+@dataclass
+class PlayerClass:
+    """
+    Represents a character class (Vanguard, Assassin, Arcanist, etc.).
+
+    Each class has unique base stats, multiple skill trees, and starting equipment.
+
+    Attributes:
+        class_id: Unique identifier
+        name: Display name
+        description: Class theme and playstyle
+        base_stats: Starting stats for this class
+        skill_trees: List of skill trees (2+ per class)
+        starting_equipment: List of item_ids for initial equipment
+        starting_abilities: List of ability_ids available from level 1
+    """
+
+    class_id: str
+    name: str
+    description: str
+    base_stats: Stats
+    skill_trees: List[SkillTree] = field(default_factory=list)
+    starting_equipment: List[str] = field(default_factory=list)
+    starting_abilities: List[str] = field(default_factory=list)
+
+    def get_skill_tree(self, tree_id: str) -> Optional[SkillTree]:
+        """
+        Get a specific skill tree by ID.
+
+        Args:
+            tree_id: Skill tree identifier
+
+        Returns:
+            SkillTree instance or None if not found
+        """
+        for tree in self.skill_trees:
+            if tree.tree_id == tree_id:
+                return tree
+        return None
+
+    def get_all_skills(self) -> List[SkillNode]:
+        """
+        Get all skill nodes from all trees.
+
+        Returns:
+            Flat list of all SkillNodes across all trees
+        """
+        all_skills = []
+        for tree in self.skill_trees:
+            all_skills.extend(tree.nodes)
+        return all_skills
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize player class to dictionary."""
+        return {
+            "class_id": self.class_id,
+            "name": self.name,
+            "description": self.description,
+            "base_stats": self.base_stats.to_dict(),
+            "skill_trees": [tree.to_dict() for tree in self.skill_trees],
+            "starting_equipment": self.starting_equipment,
+            "starting_abilities": self.starting_abilities,
+        }
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'PlayerClass':
+        """Deserialize player class from dictionary."""
+        base_stats = Stats.from_dict(data["base_stats"])
+        skill_trees = [SkillTree.from_dict(t) for t in data.get("skill_trees", [])]
+
+        return cls(
+            class_id=data["class_id"],
+            name=data["name"],
+            description=data["description"],
+            base_stats=base_stats,
+            skill_trees=skill_trees,
+            starting_equipment=data.get("starting_equipment", []),
+            starting_abilities=data.get("starting_abilities", []),
+        )
+
+    def __repr__(self) -> str:
+        """String representation of the player class."""
+        return (
+            f"PlayerClass({self.name}, "
+            f"trees={len(self.skill_trees)}, "
+            f"total_skills={len(self.get_all_skills())})"
+        )

api/app/models/stats.py

@@ -0,0 +1,140 @@
+"""
+Character statistics data model.
+
+This module defines the Stats dataclass which represents a character's core
+attributes and provides computed properties for derived values like HP and MP.
+"""
+
+from dataclasses import dataclass, field, asdict
+from typing import Dict, Any
+
+
+@dataclass
+class Stats:
+    """
+    Character statistics representing core attributes.
+
+    Attributes:
+        strength: Physical power, affects melee damage
+        dexterity: Agility and precision, affects initiative and evasion
+        constitution: Endurance and health, affects HP and defense
+        intelligence: Magical power, affects spell damage and MP
+        wisdom: Perception and insight, affects magical resistance
+        charisma: Social influence, affects NPC interactions
+
+    Computed Properties:
+        hit_points: Maximum HP = 10 + (constitution × 2)
+        mana_points: Maximum MP = 10 + (intelligence × 2)
+        defense: Physical defense = constitution // 2
+        resistance: Magical resistance = wisdom // 2
+    """
+
+    strength: int = 10
+    dexterity: int = 10
+    constitution: int = 10
+    intelligence: int = 10
+    wisdom: int = 10
+    charisma: int = 10
+
+    @property
+    def hit_points(self) -> int:
+        """
+        Calculate maximum hit points based on constitution.
+
+        Formula: 10 + (constitution × 2)
+
+        Returns:
+            Maximum HP value
+        """
+        return 10 + (self.constitution * 2)
+
+    @property
+    def mana_points(self) -> int:
+        """
+        Calculate maximum mana points based on intelligence.
+
+        Formula: 10 + (intelligence × 2)
+
+        Returns:
+            Maximum MP value
+        """
+        return 10 + (self.intelligence * 2)
+
+    @property
+    def defense(self) -> int:
+        """
+        Calculate physical defense from constitution.
+
+        Formula: constitution // 2
+
+        Returns:
+            Physical defense value (damage reduction)
+        """
+        return self.constitution // 2
+
+    @property
+    def resistance(self) -> int:
+        """
+        Calculate magical resistance from wisdom.
+
+        Formula: wisdom // 2
+
+        Returns:
+            Magical resistance value (spell damage reduction)
+        """
+        return self.wisdom // 2
+
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Serialize stats to a dictionary.
+
+        Returns:
+            Dictionary containing all stat values
+        """
+        return asdict(self)
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> 'Stats':
+        """
+        Deserialize stats from a dictionary.
+
+        Args:
+            data: Dictionary containing stat values
+
+        Returns:
+            Stats instance
+        """
+        return cls(
+            strength=data.get("strength", 10),
+            dexterity=data.get("dexterity", 10),
+            constitution=data.get("constitution", 10),
+            intelligence=data.get("intelligence", 10),
+            wisdom=data.get("wisdom", 10),
+            charisma=data.get("charisma", 10),
+        )
+
+    def copy(self) -> 'Stats':
+        """
+        Create a deep copy of this Stats instance.
+
+        Returns:
+            New Stats instance with same values
+        """
+        return Stats(
+            strength=self.strength,
+            dexterity=self.dexterity,
+            constitution=self.constitution,
+            intelligence=self.intelligence,
+            wisdom=self.wisdom,
+            charisma=self.charisma,
+        )
+
+    def __repr__(self) -> str:
+        """String representation showing all stats and computed properties."""
+        return (
+            f"Stats(STR={self.strength}, DEX={self.dexterity}, "
+            f"CON={self.constitution}, INT={self.intelligence}, "
+            f"WIS={self.wisdom}, CHA={self.charisma}, "
+            f"HP={self.hit_points}, MP={self.mana_points}, "
+            f"DEF={self.defense}, RES={self.resistance})"
+        )

api/app/services/action_prompt_loader.py

@@ -0,0 +1,320 @@
+"""
+Action Prompt Loader Service
+
+This module provides a service for loading and filtering action prompts from YAML.
+It implements a singleton pattern to cache loaded prompts in memory.
+
+Usage:
+    from app.services.action_prompt_loader import ActionPromptLoader
+
+    loader = ActionPromptLoader()
+    loader.load_from_yaml("app/data/action_prompts.yaml")
+
+    # Get available actions for a user at a location
+    actions = loader.get_available_actions(
+        user_tier=UserTier.FREE,
+        location_type=LocationType.TOWN
+    )
+
+    # Get specific action
+    action = loader.get_action_by_id("ask_locals")
+"""
+
+import os
+from typing import List, Optional, Dict
+
+import yaml
+
+from app.models.action_prompt import ActionPrompt, LocationType
+from app.ai.model_selector import UserTier
+from app.utils.logging import get_logger
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+
+class ActionPromptLoaderError(Exception):
+    """Base exception for action prompt loader errors."""
+    pass
+
+
+class ActionPromptNotFoundError(ActionPromptLoaderError):
+    """Raised when a requested action prompt is not found."""
+    pass
+
+
+class ActionPromptLoader:
+    """
+    Service for loading and filtering action prompts.
+
+    This class loads action prompts from YAML files and provides methods
+    to filter them based on user tier and location type.
+
+    Uses singleton pattern to cache loaded prompts in memory.
+
+    Attributes:
+        _prompts: Dictionary of loaded action prompts keyed by prompt_id
+        _loaded: Flag indicating if prompts have been loaded
+    """
+
+    _instance = None
+    _prompts: Dict[str, ActionPrompt] = {}
+    _loaded: bool = False
+
+    def __new__(cls):
+        """Implement singleton pattern."""
+        if cls._instance is None:
+            cls._instance = super().__new__(cls)
+            cls._instance._prompts = {}
+            cls._instance._loaded = False
+        return cls._instance
+
+    def load_from_yaml(self, filepath: str) -> int:
+        """
+        Load action prompts from a YAML file.
+
+        Args:
+            filepath: Path to the YAML file
+
+        Returns:
+            Number of prompts loaded
+
+        Raises:
+            ActionPromptLoaderError: If file cannot be read or parsed
+        """
+        if not os.path.exists(filepath):
+            logger.error("Action prompts file not found", filepath=filepath)
+            raise ActionPromptLoaderError(f"File not found: {filepath}")
+
+        try:
+            with open(filepath, 'r', encoding='utf-8') as f:
+                data = yaml.safe_load(f)
+
+        except yaml.YAMLError as e:
+            logger.error("Failed to parse YAML", filepath=filepath, error=str(e))
+            raise ActionPromptLoaderError(f"Invalid YAML in {filepath}: {e}")
+
+        except IOError as e:
+            logger.error("Failed to read file", filepath=filepath, error=str(e))
+            raise ActionPromptLoaderError(f"Cannot read {filepath}: {e}")
+
+        if not data or 'action_prompts' not in data:
+            logger.error("No action_prompts key in YAML", filepath=filepath)
+            raise ActionPromptLoaderError(f"Missing 'action_prompts' key in {filepath}")
+
+        # Clear existing prompts
+        self._prompts = {}
+
+        # Parse each prompt
+        prompts_data = data['action_prompts']
+        errors = []
+
+        for i, prompt_data in enumerate(prompts_data):
+            try:
+                prompt = ActionPrompt.from_dict(prompt_data)
+                self._prompts[prompt.prompt_id] = prompt
+
+            except (ValueError, KeyError) as e:
+                errors.append(f"Prompt {i}: {e}")
+                logger.warning(
+                    "Failed to parse action prompt",
+                    index=i,
+                    error=str(e)
+                )
+
+        if errors:
+            logger.warning(
+                "Some action prompts failed to load",
+                error_count=len(errors),
+                errors=errors
+            )
+
+        self._loaded = True
+        loaded_count = len(self._prompts)
+
+        logger.info(
+            "Action prompts loaded",
+            filepath=filepath,
+            count=loaded_count,
+            errors=len(errors)
+        )
+
+        return loaded_count
+
+    def get_all_actions(self) -> List[ActionPrompt]:
+        """
+        Get all loaded action prompts.
+
+        Returns:
+            List of all action prompts
+        """
+        self._ensure_loaded()
+        return list(self._prompts.values())
+
+    def get_action_by_id(self, prompt_id: str) -> ActionPrompt:
+        """
+        Get a specific action prompt by ID.
+
+        Args:
+            prompt_id: The unique identifier of the action
+
+        Returns:
+            The ActionPrompt object
+
+        Raises:
+            ActionPromptNotFoundError: If action not found
+        """
+        self._ensure_loaded()
+
+        if prompt_id not in self._prompts:
+            logger.warning("Action prompt not found", prompt_id=prompt_id)
+            raise ActionPromptNotFoundError(f"Action prompt '{prompt_id}' not found")
+
+        return self._prompts[prompt_id]
+
+    def get_available_actions(
+        self,
+        user_tier: UserTier,
+        location_type: LocationType
+    ) -> List[ActionPrompt]:
+        """
+        Get actions available to a user at a specific location.
+
+        Args:
+            user_tier: The user's subscription tier
+            location_type: The current location type
+
+        Returns:
+            List of available action prompts
+        """
+        self._ensure_loaded()
+
+        available = []
+        for prompt in self._prompts.values():
+            if prompt.is_available(user_tier, location_type):
+                available.append(prompt)
+
+        logger.debug(
+            "Filtered available actions",
+            user_tier=user_tier.value,
+            location_type=location_type.value,
+            count=len(available)
+        )
+
+        return available
+
+    def get_actions_by_tier(self, user_tier: UserTier) -> List[ActionPrompt]:
+        """
+        Get all actions available to a user tier (ignoring location).
+
+        Args:
+            user_tier: The user's subscription tier
+
+        Returns:
+            List of action prompts available to the tier
+        """
+        self._ensure_loaded()
+
+        available = []
+        for prompt in self._prompts.values():
+            if prompt._tier_meets_requirement(user_tier):
+                available.append(prompt)
+
+        return available
+
+    def get_actions_by_category(self, category: str) -> List[ActionPrompt]:
+        """
+        Get all actions in a specific category.
+
+        Args:
+            category: The action category (e.g., "ask_question", "explore")
+
+        Returns:
+            List of action prompts in the category
+        """
+        self._ensure_loaded()
+
+        return [
+            prompt for prompt in self._prompts.values()
+            if prompt.category.value == category
+        ]
+
+    def get_locked_actions(
+        self,
+        user_tier: UserTier,
+        location_type: LocationType
+    ) -> List[ActionPrompt]:
+        """
+        Get actions that are locked due to tier restrictions.
+
+        Used to show locked actions with upgrade prompts in UI.
+
+        Args:
+            user_tier: The user's subscription tier
+            location_type: The current location type
+
+        Returns:
+            List of locked action prompts
+        """
+        self._ensure_loaded()
+
+        locked = []
+        for prompt in self._prompts.values():
+            # Must match location but be tier-locked
+            if prompt._location_matches_filter(location_type) and prompt.is_locked(user_tier):
+                locked.append(prompt)
+
+        return locked
+
+    def reload(self, filepath: str) -> int:
+        """
+        Force reload prompts from YAML file.
+
+        Args:
+            filepath: Path to the YAML file
+
+        Returns:
+            Number of prompts loaded
+        """
+        self._loaded = False
+        return self.load_from_yaml(filepath)
+
+    def is_loaded(self) -> bool:
+        """Check if prompts have been loaded."""
+        return self._loaded
+
+    def get_prompt_count(self) -> int:
+        """Get the number of loaded prompts."""
+        return len(self._prompts)
+
+    def _ensure_loaded(self) -> None:
+        """
+        Ensure prompts are loaded, auto-load from default path if not.
+
+        Raises:
+            ActionPromptLoaderError: If prompts cannot be loaded
+        """
+        if not self._loaded:
+            # Try default path
+            default_path = os.path.join(
+                os.path.dirname(__file__),
+                '..', 'data', 'action_prompts.yaml'
+            )
+            default_path = os.path.normpath(default_path)
+
+            if os.path.exists(default_path):
+                self.load_from_yaml(default_path)
+            else:
+                raise ActionPromptLoaderError(
+                    "Action prompts not loaded. Call load_from_yaml() first."
+                )
+
+    @classmethod
+    def reset_instance(cls) -> None:
+        """
+        Reset the singleton instance.
+
+        Primarily for testing purposes.
+        """
+        cls._instance = None

api/app/services/appwrite_service.py

@@ -0,0 +1,588 @@
+"""
+Appwrite Service Wrapper
+
+This module provides a wrapper around the Appwrite SDK for handling user authentication,
+session management, and user data operations. It abstracts Appwrite's API to provide
+a clean interface for the application.
+
+Usage:
+    from app.services.appwrite_service import AppwriteService
+
+    # Initialize service
+    service = AppwriteService()
+
+    # Register a new user
+    user = service.register_user(
+        email="player@example.com",
+        password="SecurePass123!",
+        name="Brave Adventurer"
+    )
+
+    # Login
+    session = service.login_user(
+        email="player@example.com",
+        password="SecurePass123!"
+    )
+"""
+
+import os
+from typing import Optional, Dict, Any
+from dataclasses import dataclass
+from datetime import datetime, timezone
+
+from appwrite.client import Client
+from appwrite.services.account import Account
+from appwrite.services.users import Users
+from appwrite.exception import AppwriteException
+from appwrite.id import ID
+
+from app.utils.logging import get_logger
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+
+@dataclass
+class UserData:
+    """
+    Data class representing a user in the system.
+
+    Attributes:
+        id: Unique user identifier
+        email: User's email address
+        name: User's display name
+        email_verified: Whether email has been verified
+        tier: User's subscription tier (free, basic, premium, elite)
+        created_at: When the user account was created
+        updated_at: When the user account was last updated
+    """
+    id: str
+    email: str
+    name: str
+    email_verified: bool
+    tier: str
+    created_at: datetime
+    updated_at: datetime
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert user data to dictionary."""
+        return {
+            "id": self.id,
+            "email": self.email,
+            "name": self.name,
+            "email_verified": self.email_verified,
+            "tier": self.tier,
+            "created_at": self.created_at.isoformat() if isinstance(self.created_at, datetime) else self.created_at,
+            "updated_at": self.updated_at.isoformat() if isinstance(self.updated_at, datetime) else self.updated_at,
+        }
+
+
+@dataclass
+class SessionData:
+    """
+    Data class representing a user session.
+
+    Attributes:
+        session_id: Unique session identifier
+        user_id: User ID associated with this session
+        provider: Authentication provider (email, oauth, etc.)
+        expire: When the session expires
+    """
+    session_id: str
+    user_id: str
+    provider: str
+    expire: datetime
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert session data to dictionary."""
+        return {
+            "session_id": self.session_id,
+            "user_id": self.user_id,
+            "provider": self.provider,
+            "expire": self.expire.isoformat() if isinstance(self.expire, datetime) else self.expire,
+        }
+
+
+class AppwriteService:
+    """
+    Service class for interacting with Appwrite authentication and user management.
+
+    This class provides methods for:
+    - User registration and email verification
+    - User login and logout
+    - Session management
+    - Password reset
+    - User tier management
+    """
+
+    def __init__(self):
+        """
+        Initialize the Appwrite service.
+
+        Reads configuration from environment variables:
+        - APPWRITE_ENDPOINT: Appwrite API endpoint
+        - APPWRITE_PROJECT_ID: Appwrite project ID
+        - APPWRITE_API_KEY: Appwrite API key (for server-side operations)
+        """
+        self.endpoint = os.getenv('APPWRITE_ENDPOINT')
+        self.project_id = os.getenv('APPWRITE_PROJECT_ID')
+        self.api_key = os.getenv('APPWRITE_API_KEY')
+
+        if not all([self.endpoint, self.project_id, self.api_key]):
+            logger.error("Missing Appwrite configuration in environment variables")
+            raise ValueError("Appwrite configuration incomplete. Check APPWRITE_* environment variables.")
+
+        # Initialize Appwrite client
+        self.client = Client()
+        self.client.set_endpoint(self.endpoint)
+        self.client.set_project(self.project_id)
+        self.client.set_key(self.api_key)
+
+        # Initialize services
+        self.account = Account(self.client)
+        self.users = Users(self.client)
+
+        logger.info("Appwrite service initialized", endpoint=self.endpoint, project_id=self.project_id)
+
+    def register_user(self, email: str, password: str, name: str) -> UserData:
+        """
+        Register a new user account.
+
+        This method:
+        1. Creates a new user in Appwrite Auth
+        2. Sets the user's tier to 'free' in preferences
+        3. Triggers email verification
+        4. Returns user data
+
+        Args:
+            email: User's email address
+            password: User's password (will be hashed by Appwrite)
+            name: User's display name
+
+        Returns:
+            UserData object with user information
+
+        Raises:
+            AppwriteException: If registration fails (e.g., email already exists)
+        """
+        try:
+            logger.info("Attempting to register new user", email=email, name=name)
+
+            # Generate unique user ID
+            user_id = ID.unique()
+
+            # Create user account
+            user = self.users.create(
+                user_id=user_id,
+                email=email,
+                password=password,
+                name=name
+            )
+
+            logger.info("User created successfully", user_id=user['$id'], email=email)
+
+            # Set default tier to 'free' in user preferences
+            self.users.update_prefs(
+                user_id=user['$id'],
+                prefs={
+                    'tier': 'free',
+                    'tier_updated_at': datetime.now(timezone.utc).isoformat()
+                }
+            )
+
+            logger.info("User tier set to 'free'", user_id=user['$id'])
+
+            # Note: Email verification is handled by Appwrite automatically
+            # when email templates are configured in the Appwrite console.
+            # For server-side user creation, verification emails are sent
+            # automatically if the email provider is configured.
+            #
+            # To manually trigger verification, users can use the Account service
+            # (client-side) after logging in, or configure email verification
+            # settings in the Appwrite console.
+
+            logger.info("User created, email verification handled by Appwrite", user_id=user['$id'], email=email)
+
+            # Return user data
+            return self._user_to_userdata(user)
+
+        except AppwriteException as e:
+            logger.error("Failed to register user", email=email, error=str(e), code=e.code)
+            raise
+
+    def login_user(self, email: str, password: str) -> tuple[SessionData, UserData]:
+        """
+        Authenticate a user and create a session.
+
+        For server-side authentication, we create a temporary client with user
+        credentials to verify them, then create a session using the server SDK.
+
+        Args:
+            email: User's email address
+            password: User's password
+
+        Returns:
+            Tuple of (SessionData, UserData)
+
+        Raises:
+            AppwriteException: If login fails (invalid credentials, etc.)
+        """
+        try:
+            logger.info("Attempting user login", email=email)
+
+            # Use admin client (with API key) to create session
+            # This is required to get the session secret in the response
+            from appwrite.services.account import Account
+
+            admin_account = Account(self.client)  # self.client already has API key set
+
+            # Create email/password session using admin client
+            # When using admin client, the 'secret' field is populated in the response
+            user_session = admin_account.create_email_password_session(
+                email=email,
+                password=password
+            )
+
+            logger.info("Session created successfully",
+                       user_id=user_session['userId'],
+                       session_id=user_session['$id'])
+
+            # Extract session secret from response
+            # Admin client populates this field, unlike regular client
+            session_secret = user_session.get('secret', '')
+
+            if not session_secret:
+                logger.error("Session secret not found in response - this should not happen with admin client")
+                raise AppwriteException("Failed to get session secret", code=500)
+
+            # Get user data using server SDK
+            user = self.users.get(user_id=user_session['userId'])
+
+            # Convert to our data classes
+            session_data = SessionData(
+                session_id=session_secret,  # Use the secret, not the session ID
+                user_id=user_session['userId'],
+                provider=user_session['provider'],
+                expire=datetime.fromisoformat(user_session['expire'].replace('Z', '+00:00'))
+            )
+
+            user_data = self._user_to_userdata(user)
+
+            return session_data, user_data
+
+        except AppwriteException as e:
+            logger.error("Failed to login user", email=email, error=str(e), code=e.code)
+            raise
+        except Exception as e:
+            logger.error("Unexpected error during login", email=email, error=str(e), exc_info=True)
+            raise AppwriteException(str(e), code=500)
+
+    def logout_user(self, session_id: str) -> bool:
+        """
+        Log out a user by deleting their session.
+
+        Args:
+            session_id: The session ID to delete
+
+        Returns:
+            True if logout successful
+
+        Raises:
+            AppwriteException: If logout fails
+        """
+        try:
+            logger.info("Attempting to logout user", session_id=session_id)
+
+            # For server-side, we need to delete the session using Users service
+            # First get the session to find the user_id
+            # Note: Appwrite doesn't have a direct server-side session delete by session_id
+            # We'll use a workaround by creating a client with the session and deleting it
+
+            from appwrite.client import Client
+            from appwrite.services.account import Account
+
+            # Create client with the session
+            session_client = Client()
+            session_client.set_endpoint(self.endpoint)
+            session_client.set_project(self.project_id)
+            session_client.set_session(session_id)
+
+            session_account = Account(session_client)
+
+            # Delete the current session
+            session_account.delete_session('current')
+
+            logger.info("User logged out successfully", session_id=session_id)
+            return True
+
+        except AppwriteException as e:
+            logger.error("Failed to logout user", session_id=session_id, error=str(e), code=e.code)
+            raise
+
+    def verify_email(self, user_id: str, secret: str) -> bool:
+        """
+        Verify a user's email address.
+
+        Note: Email verification with server-side SDK requires updating
+        the user's emailVerification status directly, or using Appwrite's
+        built-in verification flow through the Account service (client-side).
+
+        Args:
+            user_id: User ID
+            secret: Verification secret from email link (not validated server-side)
+
+        Returns:
+            True if verification successful
+
+        Raises:
+            AppwriteException: If verification fails (invalid/expired secret)
+        """
+        try:
+            logger.info("Attempting to verify email", user_id=user_id, secret_provided=bool(secret))
+
+            # For server-side verification, we update the user's email verification status
+            # The secret validation should be done by Appwrite's verification flow
+            # For now, we'll mark the email as verified
+            # In production, you should validate the secret token before updating
+            self.users.update_email_verification(user_id=user_id, email_verification=True)
+
+            logger.info("Email verified successfully", user_id=user_id)
+            return True
+
+        except AppwriteException as e:
+            logger.error("Failed to verify email", user_id=user_id, error=str(e), code=e.code)
+            raise
+
+    def request_password_reset(self, email: str) -> bool:
+        """
+        Request a password reset for a user.
+
+        This sends a password reset email to the user. For security,
+        it always returns True even if the email doesn't exist.
+
+        Note: Password reset is handled through Appwrite's built-in Account
+        service recovery flow. For server-side operations, we would need to
+        create a password recovery token manually.
+
+        Args:
+            email: User's email address
+
+        Returns:
+            Always True (for security - don't reveal if email exists)
+        """
+        try:
+            logger.info("Password reset requested", email=email)
+
+            # Note: Password reset with server-side SDK requires creating
+            # a recovery token. For now, we'll log this and return success.
+            # In production, configure Appwrite's email templates and use
+            # client-side Account.createRecovery() or implement custom token
+            # generation and email sending.
+
+            logger.warning("Password reset not fully implemented - requires Appwrite email configuration", email=email)
+
+        except Exception as e:
+            # Log the error but still return True for security
+            # Don't reveal whether the email exists
+            logger.warning("Password reset request encountered error", email=email, error=str(e))
+
+        # Always return True to not reveal if email exists
+        return True
+
+    def confirm_password_reset(self, user_id: str, secret: str, password: str) -> bool:
+        """
+        Confirm a password reset and update the user's password.
+
+        Note: For server-side operations, we update the password directly
+        using the Users service. Secret validation would be handled separately.
+
+        Args:
+            user_id: User ID
+            secret: Reset secret from email link (should be validated before calling)
+            password: New password
+
+        Returns:
+            True if password reset successful
+
+        Raises:
+            AppwriteException: If reset fails
+        """
+        try:
+            logger.info("Attempting to reset password", user_id=user_id, secret_provided=bool(secret))
+
+            # For server-side password reset, update the password directly
+            # In production, you should validate the secret token first before calling this
+            # The secret parameter is kept for API compatibility but not validated here
+            self.users.update_password(user_id=user_id, password=password)
+
+            logger.info("Password reset successfully", user_id=user_id)
+            return True
+
+        except AppwriteException as e:
+            logger.error("Failed to reset password", user_id=user_id, error=str(e), code=e.code)
+            raise
+
+    def get_user(self, user_id: str) -> UserData:
+        """
+        Get user data by user ID.
+
+        Args:
+            user_id: User ID
+
+        Returns:
+            UserData object
+
+        Raises:
+            AppwriteException: If user not found
+        """
+        try:
+            user = self.users.get(user_id=user_id)
+
+            return self._user_to_userdata(user)
+
+        except AppwriteException as e:
+            logger.error("Failed to fetch user", user_id=user_id, error=str(e), code=e.code)
+            raise
+
+    def get_session(self, session_id: str) -> SessionData:
+        """
+        Get session data and validate it's still active.
+
+        Args:
+            session_id: Session ID
+
+        Returns:
+            SessionData object
+
+        Raises:
+            AppwriteException: If session invalid or expired
+        """
+        try:
+            # Create a client with the session to validate it
+            from appwrite.client import Client
+            from appwrite.services.account import Account
+
+            session_client = Client()
+            session_client.set_endpoint(self.endpoint)
+            session_client.set_project(self.project_id)
+            session_client.set_session(session_id)
+
+            session_account = Account(session_client)
+
+            # Get the current session (this validates it exists and is active)
+            session = session_account.get_session('current')
+
+            # Check if session is expired
+            expire_time = datetime.fromisoformat(session['expire'].replace('Z', '+00:00'))
+            if expire_time < datetime.now(timezone.utc):
+                logger.warning("Session expired", session_id=session_id, expired_at=expire_time)
+                raise AppwriteException("Session expired", code=401)
+
+            return SessionData(
+                session_id=session['$id'],
+                user_id=session['userId'],
+                provider=session['provider'],
+                expire=expire_time
+            )
+
+        except AppwriteException as e:
+            logger.error("Failed to validate session", session_id=session_id, error=str(e), code=e.code)
+            raise
+
+    def get_user_tier(self, user_id: str) -> str:
+        """
+        Get the user's subscription tier.
+
+        Args:
+            user_id: User ID
+
+        Returns:
+            Tier string (free, basic, premium, elite)
+        """
+        try:
+            logger.debug("Fetching user tier", user_id=user_id)
+
+            user = self.users.get(user_id=user_id)
+            prefs = user.get('prefs', {})
+            tier = prefs.get('tier', 'free')
+
+            logger.debug("User tier retrieved", user_id=user_id, tier=tier)
+            return tier
+
+        except AppwriteException as e:
+            logger.error("Failed to fetch user tier", user_id=user_id, error=str(e), code=e.code)
+            # Default to free tier on error
+            return 'free'
+
+    def set_user_tier(self, user_id: str, tier: str) -> bool:
+        """
+        Update the user's subscription tier.
+
+        Args:
+            user_id: User ID
+            tier: New tier (free, basic, premium, elite)
+
+        Returns:
+            True if update successful
+
+        Raises:
+            AppwriteException: If update fails
+            ValueError: If tier is invalid
+        """
+        valid_tiers = ['free', 'basic', 'premium', 'elite']
+        if tier not in valid_tiers:
+            raise ValueError(f"Invalid tier: {tier}. Must be one of {valid_tiers}")
+
+        try:
+            logger.info("Updating user tier", user_id=user_id, new_tier=tier)
+
+            # Get current preferences
+            user = self.users.get(user_id=user_id)
+            prefs = user.get('prefs', {})
+
+            # Update tier
+            prefs['tier'] = tier
+            prefs['tier_updated_at'] = datetime.now(timezone.utc).isoformat()
+
+            self.users.update_prefs(user_id=user_id, prefs=prefs)
+
+            logger.info("User tier updated successfully", user_id=user_id, tier=tier)
+            return True
+
+        except AppwriteException as e:
+            logger.error("Failed to update user tier", user_id=user_id, tier=tier, error=str(e), code=e.code)
+            raise
+
+    def _user_to_userdata(self, user: Dict[str, Any]) -> UserData:
+        """
+        Convert Appwrite user object to UserData dataclass.
+
+        Args:
+            user: Appwrite user dictionary
+
+        Returns:
+            UserData object
+        """
+        # Get tier from preferences, default to 'free'
+        prefs = user.get('prefs', {})
+        tier = prefs.get('tier', 'free')
+
+        # Parse timestamps
+        created_at = user.get('$createdAt', datetime.now(timezone.utc).isoformat())
+        updated_at = user.get('$updatedAt', datetime.now(timezone.utc).isoformat())
+
+        if isinstance(created_at, str):
+            created_at = datetime.fromisoformat(created_at.replace('Z', '+00:00'))
+        if isinstance(updated_at, str):
+            updated_at = datetime.fromisoformat(updated_at.replace('Z', '+00:00'))
+
+        return UserData(
+            id=user['$id'],
+            email=user['email'],
+            name=user['name'],
+            email_verified=user.get('emailVerification', False),
+            tier=tier,
+            created_at=created_at,
+            updated_at=updated_at
+        )

api/app/services/class_loader.py

@@ -0,0 +1,277 @@
+"""
+ClassLoader service for loading player class definitions from YAML files.
+
+This service reads class configuration files and converts them into PlayerClass
+dataclass instances, providing caching for performance.
+"""
+
+import yaml
+from pathlib import Path
+from typing import Dict, List, Optional
+import structlog
+
+from app.models.skills import PlayerClass, SkillTree, SkillNode
+from app.models.stats import Stats
+
+logger = structlog.get_logger(__name__)
+
+
+class ClassLoader:
+    """
+    Loads player class definitions from YAML configuration files.
+
+    This allows game designers to define classes and skill trees without touching code.
+    All class definitions are stored in /app/data/classes/ as YAML files.
+    """
+
+    def __init__(self, data_dir: Optional[str] = None):
+        """
+        Initialize the class loader.
+
+        Args:
+            data_dir: Path to directory containing class YAML files.
+                     Defaults to /app/data/classes/
+        """
+        if data_dir is None:
+            # Default to app/data/classes relative to this file
+            current_file = Path(__file__)
+            app_dir = current_file.parent.parent  # Go up to /app
+            data_dir = str(app_dir / "data" / "classes")
+
+        self.data_dir = Path(data_dir)
+        self._class_cache: Dict[str, PlayerClass] = {}
+
+        logger.info("ClassLoader initialized", data_dir=str(self.data_dir))
+
+    def load_class(self, class_id: str) -> Optional[PlayerClass]:
+        """
+        Load a single player class by ID.
+
+        Args:
+            class_id: Unique class identifier (e.g., "vanguard")
+
+        Returns:
+            PlayerClass instance or None if not found
+        """
+        # Check cache first
+        if class_id in self._class_cache:
+            logger.debug("Class loaded from cache", class_id=class_id)
+            return self._class_cache[class_id]
+
+        # Construct file path
+        file_path = self.data_dir / f"{class_id}.yaml"
+
+        if not file_path.exists():
+            logger.warning("Class file not found", class_id=class_id, file_path=str(file_path))
+            return None
+
+        try:
+            # Load YAML file
+            with open(file_path, 'r') as f:
+                data = yaml.safe_load(f)
+
+            # Parse into PlayerClass
+            player_class = self._parse_class_data(data)
+
+            # Cache the result
+            self._class_cache[class_id] = player_class
+
+            logger.info("Class loaded successfully", class_id=class_id)
+            return player_class
+
+        except Exception as e:
+            logger.error("Failed to load class", class_id=class_id, error=str(e))
+            return None
+
+    def load_all_classes(self) -> List[PlayerClass]:
+        """
+        Load all player classes from the data directory.
+
+        Returns:
+            List of PlayerClass instances
+        """
+        classes = []
+
+        # Find all YAML files in the directory
+        if not self.data_dir.exists():
+            logger.error("Class data directory does not exist", data_dir=str(self.data_dir))
+            return classes
+
+        for file_path in self.data_dir.glob("*.yaml"):
+            class_id = file_path.stem  # Get filename without extension
+            player_class = self.load_class(class_id)
+            if player_class:
+                classes.append(player_class)
+
+        logger.info("All classes loaded", count=len(classes))
+        return classes
+
+    def get_class_by_id(self, class_id: str) -> Optional[PlayerClass]:
+        """
+        Get a player class by ID (alias for load_class).
+
+        Args:
+            class_id: Unique class identifier
+
+        Returns:
+            PlayerClass instance or None if not found
+        """
+        return self.load_class(class_id)
+
+    def get_all_class_ids(self) -> List[str]:
+        """
+        Get a list of all available class IDs.
+
+        Returns:
+            List of class IDs (e.g., ["vanguard", "assassin", "arcanist"])
+        """
+        if not self.data_dir.exists():
+            return []
+
+        return [file_path.stem for file_path in self.data_dir.glob("*.yaml")]
+
+    def reload_class(self, class_id: str) -> Optional[PlayerClass]:
+        """
+        Force reload a class from disk, bypassing cache.
+
+        Useful for development/testing when class definitions change.
+
+        Args:
+            class_id: Unique class identifier
+
+        Returns:
+            PlayerClass instance or None if not found
+        """
+        # Remove from cache if present
+        if class_id in self._class_cache:
+            del self._class_cache[class_id]
+
+        return self.load_class(class_id)
+
+    def clear_cache(self):
+        """Clear the class cache. Useful for testing."""
+        self._class_cache.clear()
+        logger.info("Class cache cleared")
+
+    def _parse_class_data(self, data: Dict) -> PlayerClass:
+        """
+        Parse YAML data into a PlayerClass dataclass.
+
+        Args:
+            data: Dictionary loaded from YAML file
+
+        Returns:
+            PlayerClass instance
+
+        Raises:
+            ValueError: If data is invalid or missing required fields
+        """
+        # Validate required fields
+        required_fields = ["class_id", "name", "description", "base_stats", "skill_trees"]
+        for field in required_fields:
+            if field not in data:
+                raise ValueError(f"Missing required field: {field}")
+
+        # Parse base stats
+        base_stats = Stats(**data["base_stats"])
+
+        # Parse skill trees
+        skill_trees = []
+        for tree_data in data["skill_trees"]:
+            skill_tree = self._parse_skill_tree(tree_data)
+            skill_trees.append(skill_tree)
+
+        # Get optional fields
+        starting_equipment = data.get("starting_equipment", [])
+        starting_abilities = data.get("starting_abilities", [])
+
+        # Create PlayerClass instance
+        player_class = PlayerClass(
+            class_id=data["class_id"],
+            name=data["name"],
+            description=data["description"],
+            base_stats=base_stats,
+            skill_trees=skill_trees,
+            starting_equipment=starting_equipment,
+            starting_abilities=starting_abilities
+        )
+
+        return player_class
+
+    def _parse_skill_tree(self, tree_data: Dict) -> SkillTree:
+        """
+        Parse a skill tree from YAML data.
+
+        Args:
+            tree_data: Dictionary containing skill tree data
+
+        Returns:
+            SkillTree instance
+        """
+        # Validate required fields
+        required_fields = ["tree_id", "name", "description", "nodes"]
+        for field in required_fields:
+            if field not in tree_data:
+                raise ValueError(f"Missing required field in skill tree: {field}")
+
+        # Parse skill nodes
+        nodes = []
+        for node_data in tree_data["nodes"]:
+            skill_node = self._parse_skill_node(node_data)
+            nodes.append(skill_node)
+
+        # Create SkillTree instance
+        skill_tree = SkillTree(
+            tree_id=tree_data["tree_id"],
+            name=tree_data["name"],
+            description=tree_data["description"],
+            nodes=nodes
+        )
+
+        return skill_tree
+
+    def _parse_skill_node(self, node_data: Dict) -> SkillNode:
+        """
+        Parse a skill node from YAML data.
+
+        Args:
+            node_data: Dictionary containing skill node data
+
+        Returns:
+            SkillNode instance
+        """
+        # Validate required fields
+        required_fields = ["skill_id", "name", "description", "tier", "effects"]
+        for field in required_fields:
+            if field not in node_data:
+                raise ValueError(f"Missing required field in skill node: {field}")
+
+        # Create SkillNode instance
+        skill_node = SkillNode(
+            skill_id=node_data["skill_id"],
+            name=node_data["name"],
+            description=node_data["description"],
+            tier=node_data["tier"],
+            prerequisites=node_data.get("prerequisites", []),
+            effects=node_data.get("effects", {}),
+            unlocked=False  # Always start locked
+        )
+
+        return skill_node
+
+
+# Global instance for convenience
+_loader_instance: Optional[ClassLoader] = None
+
+
+def get_class_loader() -> ClassLoader:
+    """
+    Get the global ClassLoader instance.
+
+    Returns:
+        Singleton ClassLoader instance
+    """
+    global _loader_instance
+    if _loader_instance is None:
+        _loader_instance = ClassLoader()
+    return _loader_instance

api/app/services/database_init.py

@@ -0,0 +1,709 @@
+"""
+Database Initialization Service.
+
+This service handles programmatic creation of Appwrite database tables,
+including schema definition, column creation, and index setup.
+"""
+
+import os
+import time
+from typing import List, Dict, Any, Optional
+
+from appwrite.client import Client
+from appwrite.services.tables_db import TablesDB
+from appwrite.exception import AppwriteException
+
+from app.utils.logging import get_logger
+
+logger = get_logger(__file__)
+
+
+class DatabaseInitService:
+    """
+    Service for initializing Appwrite database tables.
+
+    This service provides methods to:
+    - Create tables if they don't exist
+    - Define table schemas (columns/attributes)
+    - Create indexes for efficient querying
+    - Validate existing table structures
+    """
+
+    def __init__(self):
+        """
+        Initialize the database initialization service.
+
+        Reads configuration from environment variables:
+        - APPWRITE_ENDPOINT: Appwrite API endpoint
+        - APPWRITE_PROJECT_ID: Appwrite project ID
+        - APPWRITE_API_KEY: Appwrite API key
+        - APPWRITE_DATABASE_ID: Appwrite database ID
+        """
+        self.endpoint = os.getenv('APPWRITE_ENDPOINT')
+        self.project_id = os.getenv('APPWRITE_PROJECT_ID')
+        self.api_key = os.getenv('APPWRITE_API_KEY')
+        self.database_id = os.getenv('APPWRITE_DATABASE_ID', 'main')
+
+        if not all([self.endpoint, self.project_id, self.api_key]):
+            logger.error("Missing Appwrite configuration in environment variables")
+            raise ValueError("Appwrite configuration incomplete. Check APPWRITE_* environment variables.")
+
+        # Initialize Appwrite client
+        self.client = Client()
+        self.client.set_endpoint(self.endpoint)
+        self.client.set_project(self.project_id)
+        self.client.set_key(self.api_key)
+
+        # Initialize TablesDB service
+        self.tables_db = TablesDB(self.client)
+
+        logger.info("DatabaseInitService initialized", database_id=self.database_id)
+
+    def init_all_tables(self) -> Dict[str, bool]:
+        """
+        Initialize all application tables.
+
+        Returns:
+            Dictionary mapping table names to success status
+        """
+        results = {}
+
+        logger.info("Initializing all database tables")
+
+        # Initialize characters table
+        try:
+            self.init_characters_table()
+            results['characters'] = True
+            logger.info("Characters table initialized successfully")
+        except Exception as e:
+            logger.error("Failed to initialize characters table", error=str(e))
+            results['characters'] = False
+
+        # Initialize game_sessions table
+        try:
+            self.init_game_sessions_table()
+            results['game_sessions'] = True
+            logger.info("Game sessions table initialized successfully")
+        except Exception as e:
+            logger.error("Failed to initialize game_sessions table", error=str(e))
+            results['game_sessions'] = False
+
+        # Initialize ai_usage_logs table
+        try:
+            self.init_ai_usage_logs_table()
+            results['ai_usage_logs'] = True
+            logger.info("AI usage logs table initialized successfully")
+        except Exception as e:
+            logger.error("Failed to initialize ai_usage_logs table", error=str(e))
+            results['ai_usage_logs'] = False
+
+        success_count = sum(1 for v in results.values() if v)
+        total_count = len(results)
+
+        logger.info("Table initialization complete",
+                   success=success_count,
+                   total=total_count,
+                   results=results)
+
+        return results
+
+    def init_characters_table(self) -> bool:
+        """
+        Initialize the characters table.
+
+        Table schema:
+        - userId (string, required): Owner's user ID
+        - characterData (string, required): JSON-serialized character data
+        - is_active (boolean, default=True): Soft delete flag
+        - created_at (datetime): Auto-managed creation timestamp
+        - updated_at (datetime): Auto-managed update timestamp
+
+        Indexes:
+        - userId: For general user queries
+        - userId + is_active: Composite index for efficiently fetching active characters
+
+        Returns:
+            True if successful
+
+        Raises:
+            AppwriteException: If table creation fails
+        """
+        table_id = 'characters'
+
+        logger.info("Initializing characters table", table_id=table_id)
+
+        try:
+            # Check if table already exists
+            try:
+                self.tables_db.get_table(
+                    database_id=self.database_id,
+                    table_id=table_id
+                )
+                logger.info("Characters table already exists", table_id=table_id)
+                return True
+            except AppwriteException as e:
+                if e.code != 404:
+                    raise
+                logger.info("Characters table does not exist, creating...")
+
+            # Create table
+            logger.info("Creating characters table")
+            table = self.tables_db.create_table(
+                database_id=self.database_id,
+                table_id=table_id,
+                name='Characters'
+            )
+            logger.info("Characters table created", table_id=table['$id'])
+
+            # Create columns
+            self._create_column(
+                table_id=table_id,
+                column_id='userId',
+                column_type='string',
+                size=255,
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='characterData',
+                column_type='string',
+                size=65535,  # Large text field for JSON data
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='is_active',
+                column_type='boolean',
+                required=False,  # Cannot be required if we want a default value
+                default=True
+            )
+
+            # Note: created_at and updated_at are auto-managed by DatabaseService
+            # through the _parse_row method and timestamp updates
+
+            # Wait for columns to fully propagate in Appwrite before creating indexes
+            logger.info("Waiting for columns to propagate before creating indexes...")
+            time.sleep(2)
+
+            # Create indexes for efficient querying
+            # Note: Individual userId index for general user queries
+            self._create_index(
+                table_id=table_id,
+                index_id='idx_userId',
+                index_type='key',
+                attributes=['userId']
+            )
+
+            # Composite index for the most common query pattern:
+            # Query.equal('userId', user_id) + Query.equal('is_active', True)
+            # This single composite index covers both conditions efficiently
+            self._create_index(
+                table_id=table_id,
+                index_id='idx_userId_is_active',
+                index_type='key',
+                attributes=['userId', 'is_active']
+            )
+
+            logger.info("Characters table initialized successfully", table_id=table_id)
+            return True
+
+        except AppwriteException as e:
+            logger.error("Failed to initialize characters table",
+                        table_id=table_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+    def init_game_sessions_table(self) -> bool:
+        """
+        Initialize the game_sessions table.
+
+        Table schema:
+        - userId (string, required): Owner's user ID
+        - characterId (string, required): Character ID for this session
+        - sessionData (string, required): JSON-serialized session data
+        - status (string, required): Session status (active, completed, abandoned)
+        - sessionType (string, required): Session type (solo, multiplayer)
+
+        Indexes:
+        - userId: For user session queries
+        - userId + status: For active session queries
+        - characterId: For character session lookups
+
+        Returns:
+            True if successful
+
+        Raises:
+            AppwriteException: If table creation fails
+        """
+        table_id = 'game_sessions'
+
+        logger.info("Initializing game_sessions table", table_id=table_id)
+
+        try:
+            # Check if table already exists
+            try:
+                self.tables_db.get_table(
+                    database_id=self.database_id,
+                    table_id=table_id
+                )
+                logger.info("Game sessions table already exists", table_id=table_id)
+                return True
+            except AppwriteException as e:
+                if e.code != 404:
+                    raise
+                logger.info("Game sessions table does not exist, creating...")
+
+            # Create table
+            logger.info("Creating game_sessions table")
+            table = self.tables_db.create_table(
+                database_id=self.database_id,
+                table_id=table_id,
+                name='Game Sessions'
+            )
+            logger.info("Game sessions table created", table_id=table['$id'])
+
+            # Create columns
+            self._create_column(
+                table_id=table_id,
+                column_id='userId',
+                column_type='string',
+                size=255,
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='characterId',
+                column_type='string',
+                size=255,
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='sessionData',
+                column_type='string',
+                size=65535,  # Large text field for JSON data
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='status',
+                column_type='string',
+                size=50,
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='sessionType',
+                column_type='string',
+                size=50,
+                required=True
+            )
+
+            # Wait for columns to fully propagate
+            logger.info("Waiting for columns to propagate before creating indexes...")
+            time.sleep(2)
+
+            # Create indexes
+            self._create_index(
+                table_id=table_id,
+                index_id='idx_userId',
+                index_type='key',
+                attributes=['userId']
+            )
+
+            self._create_index(
+                table_id=table_id,
+                index_id='idx_userId_status',
+                index_type='key',
+                attributes=['userId', 'status']
+            )
+
+            self._create_index(
+                table_id=table_id,
+                index_id='idx_characterId',
+                index_type='key',
+                attributes=['characterId']
+            )
+
+            logger.info("Game sessions table initialized successfully", table_id=table_id)
+            return True
+
+        except AppwriteException as e:
+            logger.error("Failed to initialize game_sessions table",
+                        table_id=table_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+    def init_ai_usage_logs_table(self) -> bool:
+        """
+        Initialize the ai_usage_logs table for tracking AI API usage and costs.
+
+        Table schema:
+        - user_id (string, required): User who made the request
+        - timestamp (string, required): ISO timestamp of the request
+        - model (string, required): Model identifier
+        - tokens_input (integer, required): Input token count
+        - tokens_output (integer, required): Output token count
+        - tokens_total (integer, required): Total token count
+        - estimated_cost (float, required): Estimated cost in USD
+        - task_type (string, required): Type of task
+        - session_id (string, optional): Game session ID
+        - character_id (string, optional): Character ID
+        - request_duration_ms (integer): Request duration in milliseconds
+        - success (boolean): Whether request succeeded
+        - error_message (string, optional): Error message if failed
+
+        Indexes:
+        - user_id: For user usage queries
+        - timestamp: For date range queries
+        - user_id + timestamp: Composite for user date range queries
+
+        Returns:
+            True if successful
+
+        Raises:
+            AppwriteException: If table creation fails
+        """
+        table_id = 'ai_usage_logs'
+
+        logger.info("Initializing ai_usage_logs table", table_id=table_id)
+
+        try:
+            # Check if table already exists
+            try:
+                self.tables_db.get_table(
+                    database_id=self.database_id,
+                    table_id=table_id
+                )
+                logger.info("AI usage logs table already exists", table_id=table_id)
+                return True
+            except AppwriteException as e:
+                if e.code != 404:
+                    raise
+                logger.info("AI usage logs table does not exist, creating...")
+
+            # Create table
+            logger.info("Creating ai_usage_logs table")
+            table = self.tables_db.create_table(
+                database_id=self.database_id,
+                table_id=table_id,
+                name='AI Usage Logs'
+            )
+            logger.info("AI usage logs table created", table_id=table['$id'])
+
+            # Create columns
+            self._create_column(
+                table_id=table_id,
+                column_id='user_id',
+                column_type='string',
+                size=255,
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='timestamp',
+                column_type='string',
+                size=50,  # ISO timestamp format
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='model',
+                column_type='string',
+                size=255,
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='tokens_input',
+                column_type='integer',
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='tokens_output',
+                column_type='integer',
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='tokens_total',
+                column_type='integer',
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='estimated_cost',
+                column_type='float',
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='task_type',
+                column_type='string',
+                size=50,
+                required=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='session_id',
+                column_type='string',
+                size=255,
+                required=False
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='character_id',
+                column_type='string',
+                size=255,
+                required=False
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='request_duration_ms',
+                column_type='integer',
+                required=False,
+                default=0
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='success',
+                column_type='boolean',
+                required=False,
+                default=True
+            )
+
+            self._create_column(
+                table_id=table_id,
+                column_id='error_message',
+                column_type='string',
+                size=1000,
+                required=False
+            )
+
+            # Wait for columns to fully propagate
+            logger.info("Waiting for columns to propagate before creating indexes...")
+            time.sleep(2)
+
+            # Create indexes
+            self._create_index(
+                table_id=table_id,
+                index_id='idx_user_id',
+                index_type='key',
+                attributes=['user_id']
+            )
+
+            self._create_index(
+                table_id=table_id,
+                index_id='idx_timestamp',
+                index_type='key',
+                attributes=['timestamp']
+            )
+
+            self._create_index(
+                table_id=table_id,
+                index_id='idx_user_id_timestamp',
+                index_type='key',
+                attributes=['user_id', 'timestamp']
+            )
+
+            logger.info("AI usage logs table initialized successfully", table_id=table_id)
+            return True
+
+        except AppwriteException as e:
+            logger.error("Failed to initialize ai_usage_logs table",
+                        table_id=table_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+    def _create_column(
+        self,
+        table_id: str,
+        column_id: str,
+        column_type: str,
+        size: Optional[int] = None,
+        required: bool = False,
+        default: Optional[Any] = None,
+        array: bool = False
+    ) -> Dict[str, Any]:
+        """
+        Create a column in a table.
+
+        Args:
+            table_id: Table ID
+            column_id: Column ID
+            column_type: Column type (string, integer, float, boolean, datetime, email, ip, url)
+            size: Column size (for string types)
+            required: Whether column is required
+            default: Default value
+            array: Whether column is an array
+
+        Returns:
+            Column creation response
+
+        Raises:
+            AppwriteException: If column creation fails
+        """
+        try:
+            logger.info("Creating column",
+                       table_id=table_id,
+                       column_id=column_id,
+                       column_type=column_type)
+
+            # Build column parameters (Appwrite SDK uses 'key' not 'column_id')
+            params = {
+                'database_id': self.database_id,
+                'table_id': table_id,
+                'key': column_id,
+                'required': required,
+                'array': array
+            }
+
+            if size is not None:
+                params['size'] = size
+
+            if default is not None:
+                params['default'] = default
+
+            # Create column using the appropriate method based on type
+            if column_type == 'string':
+                result = self.tables_db.create_string_column(**params)
+            elif column_type == 'integer':
+                result = self.tables_db.create_integer_column(**params)
+            elif column_type == 'float':
+                result = self.tables_db.create_float_column(**params)
+            elif column_type == 'boolean':
+                result = self.tables_db.create_boolean_column(**params)
+            elif column_type == 'datetime':
+                result = self.tables_db.create_datetime_column(**params)
+            elif column_type == 'email':
+                result = self.tables_db.create_email_column(**params)
+            else:
+                raise ValueError(f"Unsupported column type: {column_type}")
+
+            logger.info("Column created successfully",
+                       table_id=table_id,
+                       column_id=column_id)
+
+            return result
+
+        except AppwriteException as e:
+            # If column already exists, log warning but don't fail
+            if e.code == 409:  # Conflict - column already exists
+                logger.warning("Column already exists",
+                             table_id=table_id,
+                             column_id=column_id)
+                return {}
+            logger.error("Failed to create column",
+                        table_id=table_id,
+                        column_id=column_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+    def _create_index(
+        self,
+        table_id: str,
+        index_id: str,
+        index_type: str,
+        attributes: List[str],
+        orders: Optional[List[str]] = None
+    ) -> Dict[str, Any]:
+        """
+        Create an index on a table.
+
+        Args:
+            table_id: Table ID
+            index_id: Index ID
+            index_type: Index type (key, fulltext, unique)
+            attributes: List of column IDs to index
+            orders: List of sort orders (ASC, DESC) for each attribute
+
+        Returns:
+            Index creation response
+
+        Raises:
+            AppwriteException: If index creation fails
+        """
+        try:
+            logger.info("Creating index",
+                       table_id=table_id,
+                       index_id=index_id,
+                       attributes=attributes)
+
+            result = self.tables_db.create_index(
+                database_id=self.database_id,
+                table_id=table_id,
+                key=index_id,
+                type=index_type,
+                columns=attributes,  # SDK uses 'columns', not 'attributes'
+                orders=orders or ['ASC'] * len(attributes)
+            )
+
+            logger.info("Index created successfully",
+                       table_id=table_id,
+                       index_id=index_id)
+
+            return result
+
+        except AppwriteException as e:
+            # If index already exists, log warning but don't fail
+            if e.code == 409:  # Conflict - index already exists
+                logger.warning("Index already exists",
+                             table_id=table_id,
+                             index_id=index_id)
+                return {}
+            logger.error("Failed to create index",
+                        table_id=table_id,
+                        index_id=index_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+
+# Global instance for convenience
+_init_service_instance: Optional[DatabaseInitService] = None
+
+
+def get_database_init_service() -> DatabaseInitService:
+    """
+    Get the global DatabaseInitService instance.
+
+    Returns:
+        Singleton DatabaseInitService instance
+    """
+    global _init_service_instance
+    if _init_service_instance is None:
+        _init_service_instance = DatabaseInitService()
+    return _init_service_instance
+
+
+def init_database() -> Dict[str, bool]:
+    """
+    Convenience function to initialize all database tables.
+
+    Returns:
+        Dictionary mapping table names to success status
+    """
+    service = get_database_init_service()
+    return service.init_all_tables()

api/app/services/database_service.py

@@ -0,0 +1,441 @@
+"""
+Database Service for Appwrite database operations.
+
+This service wraps the Appwrite Databases SDK to provide a clean interface
+for CRUD operations on collections. It handles JSON serialization, error handling,
+and provides structured logging.
+"""
+
+import os
+from typing import Dict, Any, List, Optional
+from datetime import datetime, timezone
+from dataclasses import dataclass
+
+from appwrite.client import Client
+from appwrite.services.tables_db import TablesDB
+from appwrite.exception import AppwriteException
+from appwrite.id import ID
+
+from app.utils.logging import get_logger
+
+logger = get_logger(__file__)
+
+
+@dataclass
+class DatabaseRow:
+    """
+    Represents a row in an Appwrite table.
+
+    Attributes:
+        id: Row ID
+        table_id: Table ID
+        data: Row data (parsed from JSON)
+        created_at: Creation timestamp
+        updated_at: Last update timestamp
+    """
+    id: str
+    table_id: str
+    data: Dict[str, Any]
+    created_at: datetime
+    updated_at: datetime
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert row to dictionary."""
+        return {
+            "id": self.id,
+            "table_id": self.table_id,
+            "data": self.data,
+            "created_at": self.created_at.isoformat() if isinstance(self.created_at, datetime) else self.created_at,
+            "updated_at": self.updated_at.isoformat() if isinstance(self.updated_at, datetime) else self.updated_at,
+        }
+
+
+class DatabaseService:
+    """
+    Service for interacting with Appwrite database tables.
+
+    This service provides methods for:
+    - Creating rows
+    - Reading rows by ID or query
+    - Updating rows
+    - Deleting rows
+    - Querying with filters
+    """
+
+    def __init__(self):
+        """
+        Initialize the database service.
+
+        Reads configuration from environment variables:
+        - APPWRITE_ENDPOINT: Appwrite API endpoint
+        - APPWRITE_PROJECT_ID: Appwrite project ID
+        - APPWRITE_API_KEY: Appwrite API key
+        - APPWRITE_DATABASE_ID: Appwrite database ID
+        """
+        self.endpoint = os.getenv('APPWRITE_ENDPOINT')
+        self.project_id = os.getenv('APPWRITE_PROJECT_ID')
+        self.api_key = os.getenv('APPWRITE_API_KEY')
+        self.database_id = os.getenv('APPWRITE_DATABASE_ID', 'main')
+
+        if not all([self.endpoint, self.project_id, self.api_key]):
+            logger.error("Missing Appwrite configuration in environment variables")
+            raise ValueError("Appwrite configuration incomplete. Check APPWRITE_* environment variables.")
+
+        # Initialize Appwrite client
+        self.client = Client()
+        self.client.set_endpoint(self.endpoint)
+        self.client.set_project(self.project_id)
+        self.client.set_key(self.api_key)
+
+        # Initialize TablesDB service
+        self.tables_db = TablesDB(self.client)
+
+        logger.info("DatabaseService initialized", database_id=self.database_id)
+
+    def create_row(
+        self,
+        table_id: str,
+        data: Dict[str, Any],
+        row_id: Optional[str] = None,
+        permissions: Optional[List[str]] = None
+    ) -> DatabaseRow:
+        """
+        Create a new row in a table.
+
+        Args:
+            table_id: Table ID (e.g., "characters")
+            data: Row data (will be JSON-serialized if needed)
+            row_id: Optional custom row ID (auto-generated if None)
+            permissions: Optional permissions array
+
+        Returns:
+            DatabaseRow with created row
+
+        Raises:
+            AppwriteException: If creation fails
+        """
+        try:
+            logger.info("Creating row", table_id=table_id, has_custom_id=bool(row_id))
+
+            # Generate ID if not provided
+            if row_id is None:
+                row_id = ID.unique()
+
+            # Create row (Appwrite manages timestamps automatically via $createdAt/$updatedAt)
+            result = self.tables_db.create_row(
+                database_id=self.database_id,
+                table_id=table_id,
+                row_id=row_id,
+                data=data,
+                permissions=permissions or []
+            )
+
+            logger.info("Row created successfully",
+                       table_id=table_id,
+                       row_id=result['$id'])
+
+            return self._parse_row(result, table_id)
+
+        except AppwriteException as e:
+            logger.error("Failed to create row",
+                        table_id=table_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+    def get_row(self, table_id: str, row_id: str) -> Optional[DatabaseRow]:
+        """
+        Get a row by ID.
+
+        Args:
+            table_id: Table ID
+            row_id: Row ID
+
+        Returns:
+            DatabaseRow or None if not found
+
+        Raises:
+            AppwriteException: If retrieval fails (except 404)
+        """
+        try:
+            logger.debug("Fetching row", table_id=table_id, row_id=row_id)
+
+            result = self.tables_db.get_row(
+                database_id=self.database_id,
+                table_id=table_id,
+                row_id=row_id
+            )
+
+            return self._parse_row(result, table_id)
+
+        except AppwriteException as e:
+            if e.code == 404:
+                logger.warning("Row not found",
+                             table_id=table_id,
+                             row_id=row_id)
+                return None
+            logger.error("Failed to fetch row",
+                        table_id=table_id,
+                        row_id=row_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+    def update_row(
+        self,
+        table_id: str,
+        row_id: str,
+        data: Dict[str, Any],
+        permissions: Optional[List[str]] = None
+    ) -> DatabaseRow:
+        """
+        Update an existing row.
+
+        Args:
+            table_id: Table ID
+            row_id: Row ID
+            data: New row data (partial updates supported)
+            permissions: Optional permissions array
+
+        Returns:
+            DatabaseRow with updated row
+
+        Raises:
+            AppwriteException: If update fails
+        """
+        try:
+            logger.info("Updating row", table_id=table_id, row_id=row_id)
+
+            # Update row (Appwrite manages timestamps automatically via $updatedAt)
+            result = self.tables_db.update_row(
+                database_id=self.database_id,
+                table_id=table_id,
+                row_id=row_id,
+                data=data,
+                permissions=permissions
+            )
+
+            logger.info("Row updated successfully",
+                       table_id=table_id,
+                       row_id=row_id)
+
+            return self._parse_row(result, table_id)
+
+        except AppwriteException as e:
+            logger.error("Failed to update row",
+                        table_id=table_id,
+                        row_id=row_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+    def delete_row(self, table_id: str, row_id: str) -> bool:
+        """
+        Delete a row.
+
+        Args:
+            table_id: Table ID
+            row_id: Row ID
+
+        Returns:
+            True if deletion successful
+
+        Raises:
+            AppwriteException: If deletion fails
+        """
+        try:
+            logger.info("Deleting row", table_id=table_id, row_id=row_id)
+
+            self.tables_db.delete_row(
+                database_id=self.database_id,
+                table_id=table_id,
+                row_id=row_id
+            )
+
+            logger.info("Row deleted successfully",
+                       table_id=table_id,
+                       row_id=row_id)
+            return True
+
+        except AppwriteException as e:
+            logger.error("Failed to delete row",
+                        table_id=table_id,
+                        row_id=row_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+    def list_rows(
+        self,
+        table_id: str,
+        queries: Optional[List[str]] = None,
+        limit: int = 25,
+        offset: int = 0
+    ) -> List[DatabaseRow]:
+        """
+        List rows in a table with optional filtering.
+
+        Args:
+            table_id: Table ID
+            queries: Optional Appwrite query filters
+            limit: Maximum rows to return (default 25, max 100)
+            offset: Number of rows to skip
+
+        Returns:
+            List of DatabaseRow instances
+
+        Raises:
+            AppwriteException: If query fails
+        """
+        try:
+            logger.debug("Listing rows",
+                        table_id=table_id,
+                        has_queries=bool(queries),
+                        limit=limit,
+                        offset=offset)
+
+            result = self.tables_db.list_rows(
+                database_id=self.database_id,
+                table_id=table_id,
+                queries=queries or []
+            )
+
+            rows = [self._parse_row(row, table_id) for row in result['rows']]
+
+            logger.debug("Rows listed successfully",
+                        table_id=table_id,
+                        count=len(rows),
+                        total=result.get('total', len(rows)))
+
+            return rows
+
+        except AppwriteException as e:
+            logger.error("Failed to list rows",
+                        table_id=table_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+    def count_rows(self, table_id: str, queries: Optional[List[str]] = None) -> int:
+        """
+        Count rows in a table with optional filtering.
+
+        Args:
+            table_id: Table ID
+            queries: Optional Appwrite query filters
+
+        Returns:
+            Row count
+
+        Raises:
+            AppwriteException: If query fails
+        """
+        try:
+            logger.debug("Counting rows", table_id=table_id, has_queries=bool(queries))
+
+            result = self.tables_db.list_rows(
+                database_id=self.database_id,
+                table_id=table_id,
+                queries=queries or []
+            )
+
+            count = result.get('total', len(result.get('rows', [])))
+            logger.debug("Rows counted", table_id=table_id, count=count)
+            return count
+
+        except AppwriteException as e:
+            logger.error("Failed to count rows",
+                        table_id=table_id,
+                        error=str(e),
+                        code=e.code)
+            raise
+
+    def _parse_row(self, row: Dict[str, Any], table_id: str) -> DatabaseRow:
+        """
+        Parse Appwrite row into DatabaseRow.
+
+        Args:
+            row: Appwrite row dictionary
+            table_id: Table ID
+
+        Returns:
+            DatabaseRow instance
+        """
+        # Extract metadata
+        row_id = row['$id']
+        created_at = row.get('$createdAt', datetime.now(timezone.utc).isoformat())
+        updated_at = row.get('$updatedAt', datetime.now(timezone.utc).isoformat())
+
+        # Parse timestamps
+        if isinstance(created_at, str):
+            created_at = datetime.fromisoformat(created_at.replace('Z', '+00:00'))
+        if isinstance(updated_at, str):
+            updated_at = datetime.fromisoformat(updated_at.replace('Z', '+00:00'))
+
+        # Remove Appwrite metadata from data
+        data = {k: v for k, v in row.items() if not k.startswith('$')}
+
+        return DatabaseRow(
+            id=row_id,
+            table_id=table_id,
+            data=data,
+            created_at=created_at,
+            updated_at=updated_at
+        )
+
+    # Backward compatibility aliases (deprecated, use new methods)
+    def create_document(self, collection_id: str, data: Dict[str, Any],
+                       document_id: Optional[str] = None,
+                       permissions: Optional[List[str]] = None) -> DatabaseRow:
+        """Deprecated: Use create_row() instead."""
+        logger.warning("create_document() is deprecated, use create_row() instead")
+        return self.create_row(collection_id, data, document_id, permissions)
+
+    def get_document(self, collection_id: str, document_id: str) -> Optional[DatabaseRow]:
+        """Deprecated: Use get_row() instead."""
+        logger.warning("get_document() is deprecated, use get_row() instead")
+        return self.get_row(collection_id, document_id)
+
+    def update_document(self, collection_id: str, document_id: str,
+                       data: Dict[str, Any],
+                       permissions: Optional[List[str]] = None) -> DatabaseRow:
+        """Deprecated: Use update_row() instead."""
+        logger.warning("update_document() is deprecated, use update_row() instead")
+        return self.update_row(collection_id, document_id, data, permissions)
+
+    def delete_document(self, collection_id: str, document_id: str) -> bool:
+        """Deprecated: Use delete_row() instead."""
+        logger.warning("delete_document() is deprecated, use delete_row() instead")
+        return self.delete_row(collection_id, document_id)
+
+    def list_documents(self, collection_id: str, queries: Optional[List[str]] = None,
+                      limit: int = 25, offset: int = 0) -> List[DatabaseRow]:
+        """Deprecated: Use list_rows() instead."""
+        logger.warning("list_documents() is deprecated, use list_rows() instead")
+        return self.list_rows(collection_id, queries, limit, offset)
+
+    def count_documents(self, collection_id: str, queries: Optional[List[str]] = None) -> int:
+        """Deprecated: Use count_rows() instead."""
+        logger.warning("count_documents() is deprecated, use count_rows() instead")
+        return self.count_rows(collection_id, queries)
+
+
+# Backward compatibility alias
+DatabaseDocument = DatabaseRow
+
+
+# Global instance for convenience
+_service_instance: Optional[DatabaseService] = None
+
+
+def get_database_service() -> DatabaseService:
+    """
+    Get the global DatabaseService instance.
+
+    Returns:
+        Singleton DatabaseService instance
+    """
+    global _service_instance
+    if _service_instance is None:
+        _service_instance = DatabaseService()
+    return _service_instance

api/app/services/item_validator.py

@@ -0,0 +1,351 @@
+"""
+Item validation service for AI-granted items.
+
+This module validates and resolves items that the AI grants to players during
+gameplay, ensuring they meet character requirements and game balance rules.
+"""
+
+import uuid
+from pathlib import Path
+from typing import Optional
+
+import structlog
+import yaml
+
+from app.models.items import Item
+from app.models.enums import ItemType
+from app.models.character import Character
+from app.ai.response_parser import ItemGrant
+
+logger = structlog.get_logger(__name__)
+
+
+class ItemValidationError(Exception):
+    """
+    Exception raised when an item fails validation.
+
+    Attributes:
+        message: Human-readable error message
+        item_grant: The ItemGrant that failed validation
+        reason: Machine-readable reason code
+    """
+
+    def __init__(self, message: str, item_grant: ItemGrant, reason: str):
+        super().__init__(message)
+        self.message = message
+        self.item_grant = item_grant
+        self.reason = reason
+
+
+class ItemValidator:
+    """
+    Validates and resolves items granted by the AI.
+
+    This service:
+    1. Resolves item references (by ID or creates generic items)
+    2. Validates items against character requirements
+    3. Logs validation failures for review
+    """
+
+    # Map of generic item type strings to ItemType enums
+    TYPE_MAP = {
+        "weapon": ItemType.WEAPON,
+        "armor": ItemType.ARMOR,
+        "consumable": ItemType.CONSUMABLE,
+        "quest_item": ItemType.QUEST_ITEM,
+    }
+
+    def __init__(self, data_path: Optional[Path] = None):
+        """
+        Initialize the item validator.
+
+        Args:
+            data_path: Path to game data directory. Defaults to app/data/
+        """
+        if data_path is None:
+            # Default to api/app/data/
+            data_path = Path(__file__).parent.parent / "data"
+
+        self.data_path = data_path
+        self._item_registry: dict[str, dict] = {}
+        self._generic_templates: dict[str, dict] = {}
+        self._load_data()
+
+        logger.info(
+            "ItemValidator initialized",
+            items_loaded=len(self._item_registry),
+            generic_templates_loaded=len(self._generic_templates)
+        )
+
+    def _load_data(self) -> None:
+        """Load item data from YAML files."""
+        # Load main item registry if it exists
+        items_file = self.data_path / "items.yaml"
+        if items_file.exists():
+            with open(items_file) as f:
+                data = yaml.safe_load(f) or {}
+                self._item_registry = data.get("items", {})
+
+        # Load generic item templates
+        generic_file = self.data_path / "generic_items.yaml"
+        if generic_file.exists():
+            with open(generic_file) as f:
+                data = yaml.safe_load(f) or {}
+                self._generic_templates = data.get("templates", {})
+
+    def resolve_item(self, item_grant: ItemGrant) -> Item:
+        """
+        Resolve an ItemGrant to an actual Item instance.
+
+        For existing items (by item_id), looks up from item registry.
+        For generic items (by name/type), creates a new Item.
+
+        Args:
+            item_grant: The ItemGrant from AI response
+
+        Returns:
+            Resolved Item instance
+
+        Raises:
+            ItemValidationError: If item cannot be resolved
+        """
+        if item_grant.is_existing_item():
+            return self._resolve_existing_item(item_grant)
+        elif item_grant.is_generic_item():
+            return self._create_generic_item(item_grant)
+        else:
+            raise ItemValidationError(
+                "ItemGrant has neither item_id nor name",
+                item_grant,
+                "INVALID_ITEM_GRANT"
+            )
+
+    def _resolve_existing_item(self, item_grant: ItemGrant) -> Item:
+        """
+        Look up an existing item by ID.
+
+        Args:
+            item_grant: ItemGrant with item_id set
+
+        Returns:
+            Item instance from registry
+
+        Raises:
+            ItemValidationError: If item not found
+        """
+        item_id = item_grant.item_id
+
+        if item_id not in self._item_registry:
+            logger.warning(
+                "Item not found in registry",
+                item_id=item_id
+            )
+            raise ItemValidationError(
+                f"Unknown item_id: {item_id}",
+                item_grant,
+                "ITEM_NOT_FOUND"
+            )
+
+        item_data = self._item_registry[item_id]
+
+        # Convert to Item instance
+        return Item.from_dict({
+            "item_id": item_id,
+            **item_data
+        })
+
+    def _create_generic_item(self, item_grant: ItemGrant) -> Item:
+        """
+        Create a generic item from AI-provided details.
+
+        Generic items are simple items with no special stats,
+        suitable for mundane objects like torches, food, etc.
+
+        Args:
+            item_grant: ItemGrant with name, type, description
+
+        Returns:
+            New Item instance
+
+        Raises:
+            ItemValidationError: If item type is invalid
+        """
+        # Validate item type
+        item_type_str = (item_grant.item_type or "consumable").lower()
+        if item_type_str not in self.TYPE_MAP:
+            logger.warning(
+                "Invalid item type from AI",
+                item_type=item_type_str,
+                item_name=item_grant.name
+            )
+            # Default to consumable for unknown types
+            item_type_str = "consumable"
+
+        item_type = self.TYPE_MAP[item_type_str]
+
+        # Generate unique ID for this item instance
+        item_id = f"generic_{uuid.uuid4().hex[:8]}"
+
+        # Check if we have a template for this item name
+        template = self._find_template(item_grant.name or "")
+
+        if template:
+            # Use template values as defaults
+            return Item(
+                item_id=item_id,
+                name=item_grant.name or template.get("name", "Unknown Item"),
+                item_type=item_type,
+                description=item_grant.description or template.get("description", ""),
+                value=item_grant.value or template.get("value", 0),
+                is_tradeable=template.get("is_tradeable", True),
+                required_level=template.get("required_level", 1),
+            )
+        else:
+            # Create with provided values only
+            return Item(
+                item_id=item_id,
+                name=item_grant.name or "Unknown Item",
+                item_type=item_type,
+                description=item_grant.description or "A simple item.",
+                value=item_grant.value,
+                is_tradeable=True,
+                required_level=1,
+            )
+
+    def _find_template(self, item_name: str) -> Optional[dict]:
+        """
+        Find a generic item template by name.
+
+        Uses case-insensitive partial matching.
+
+        Args:
+            item_name: Name of the item to find
+
+        Returns:
+            Template dict or None if not found
+        """
+        name_lower = item_name.lower()
+
+        # Exact match first
+        if name_lower in self._generic_templates:
+            return self._generic_templates[name_lower]
+
+        # Partial match
+        for template_name, template in self._generic_templates.items():
+            if template_name in name_lower or name_lower in template_name:
+                return template
+
+        return None
+
+    def validate_item_for_character(
+        self,
+        item: Item,
+        character: Character
+    ) -> tuple[bool, Optional[str]]:
+        """
+        Validate that a character can receive an item.
+
+        Checks:
+        - Level requirements
+        - Class restrictions
+
+        Args:
+            item: The Item to validate
+            character: The Character to receive the item
+
+        Returns:
+            Tuple of (is_valid, error_message)
+        """
+        # Check level requirement
+        if item.required_level > character.level:
+            error_msg = (
+                f"Item '{item.name}' requires level {item.required_level}, "
+                f"but character is level {character.level}"
+            )
+            logger.warning(
+                "Item validation failed: level requirement",
+                item_name=item.name,
+                required_level=item.required_level,
+                character_level=character.level,
+                character_name=character.name
+            )
+            return False, error_msg
+
+        # Check class restriction
+        if item.required_class:
+            character_class = character.player_class.class_id
+            if item.required_class.lower() != character_class.lower():
+                error_msg = (
+                    f"Item '{item.name}' requires class {item.required_class}, "
+                    f"but character is {character_class}"
+                )
+                logger.warning(
+                    "Item validation failed: class restriction",
+                    item_name=item.name,
+                    required_class=item.required_class,
+                    character_class=character_class,
+                    character_name=character.name
+                )
+                return False, error_msg
+
+        return True, None
+
+    def validate_and_resolve_item(
+        self,
+        item_grant: ItemGrant,
+        character: Character
+    ) -> tuple[Optional[Item], Optional[str]]:
+        """
+        Resolve an item grant and validate it for a character.
+
+        This is the main entry point for processing AI-granted items.
+
+        Args:
+            item_grant: The ItemGrant from AI response
+            character: The Character to receive the item
+
+        Returns:
+            Tuple of (Item if valid else None, error_message if invalid else None)
+        """
+        try:
+            # Resolve the item
+            item = self.resolve_item(item_grant)
+
+            # Validate for character
+            is_valid, error_msg = self.validate_item_for_character(item, character)
+
+            if not is_valid:
+                return None, error_msg
+
+            logger.info(
+                "Item validated successfully",
+                item_name=item.name,
+                item_id=item.item_id,
+                character_name=character.name
+            )
+            return item, None
+
+        except ItemValidationError as e:
+            logger.warning(
+                "Item resolution failed",
+                error=e.message,
+                reason=e.reason
+            )
+            return None, e.message
+
+
+# Global instance for convenience
+_validator_instance: Optional[ItemValidator] = None
+
+
+def get_item_validator() -> ItemValidator:
+    """
+    Get or create the global ItemValidator instance.
+
+    Returns:
+        ItemValidator singleton instance
+    """
+    global _validator_instance
+    if _validator_instance is None:
+        _validator_instance = ItemValidator()
+    return _validator_instance

api/app/services/location_loader.py

@@ -0,0 +1,326 @@
+"""
+LocationLoader service for loading location definitions from YAML files.
+
+This service reads location configuration files and converts them into Location
+dataclass instances, providing caching for performance. Locations are organized
+by region subdirectories.
+"""
+
+import yaml
+from pathlib import Path
+from typing import Dict, List, Optional
+import structlog
+
+from app.models.location import Location, Region
+from app.models.enums import LocationType
+
+logger = structlog.get_logger(__name__)
+
+
+class LocationLoader:
+    """
+    Loads location definitions from YAML configuration files.
+
+    Locations are organized in region subdirectories:
+    /app/data/locations/
+      regions/
+        crossville.yaml
+      crossville/
+        crossville_village.yaml
+        crossville_tavern.yaml
+
+    This allows game designers to define world locations without touching code.
+    """
+
+    def __init__(self, data_dir: Optional[str] = None):
+        """
+        Initialize the location loader.
+
+        Args:
+            data_dir: Path to directory containing location YAML files.
+                     Defaults to /app/data/locations/
+        """
+        if data_dir is None:
+            # Default to app/data/locations relative to this file
+            current_file = Path(__file__)
+            app_dir = current_file.parent.parent  # Go up to /app
+            data_dir = str(app_dir / "data" / "locations")
+
+        self.data_dir = Path(data_dir)
+        self._location_cache: Dict[str, Location] = {}
+        self._region_cache: Dict[str, Region] = {}
+
+        logger.info("LocationLoader initialized", data_dir=str(self.data_dir))
+
+    def load_location(self, location_id: str) -> Optional[Location]:
+        """
+        Load a single location by ID.
+
+        Searches all region subdirectories for the location file.
+
+        Args:
+            location_id: Unique location identifier (e.g., "crossville_tavern")
+
+        Returns:
+            Location instance or None if not found
+        """
+        # Check cache first
+        if location_id in self._location_cache:
+            logger.debug("Location loaded from cache", location_id=location_id)
+            return self._location_cache[location_id]
+
+        # Search in region subdirectories
+        if not self.data_dir.exists():
+            logger.error("Location data directory does not exist", data_dir=str(self.data_dir))
+            return None
+
+        for region_dir in self.data_dir.iterdir():
+            # Skip non-directories and the regions folder
+            if not region_dir.is_dir() or region_dir.name == "regions":
+                continue
+
+            file_path = region_dir / f"{location_id}.yaml"
+            if file_path.exists():
+                return self._load_location_file(file_path)
+
+        logger.warning("Location not found", location_id=location_id)
+        return None
+
+    def _load_location_file(self, file_path: Path) -> Optional[Location]:
+        """
+        Load a location from a specific file.
+
+        Args:
+            file_path: Path to the YAML file
+
+        Returns:
+            Location instance or None if loading fails
+        """
+        try:
+            with open(file_path, 'r') as f:
+                data = yaml.safe_load(f)
+
+            location = self._parse_location_data(data)
+            self._location_cache[location.location_id] = location
+
+            logger.info("Location loaded successfully", location_id=location.location_id)
+            return location
+
+        except Exception as e:
+            logger.error("Failed to load location", file=str(file_path), error=str(e))
+            return None
+
+    def _parse_location_data(self, data: Dict) -> Location:
+        """
+        Parse YAML data into a Location dataclass.
+
+        Args:
+            data: Dictionary loaded from YAML file
+
+        Returns:
+            Location instance
+
+        Raises:
+            ValueError: If data is invalid or missing required fields
+        """
+        # Validate required fields
+        required_fields = ["location_id", "name", "region_id", "description"]
+        for field in required_fields:
+            if field not in data:
+                raise ValueError(f"Missing required field: {field}")
+
+        # Parse location type - default to town
+        location_type_str = data.get("location_type", "town")
+        try:
+            location_type = LocationType(location_type_str)
+        except ValueError:
+            logger.warning(
+                "Invalid location type, defaulting to town",
+                location_id=data["location_id"],
+                invalid_type=location_type_str
+            )
+            location_type = LocationType.TOWN
+
+        return Location(
+            location_id=data["location_id"],
+            name=data["name"],
+            location_type=location_type,
+            region_id=data["region_id"],
+            description=data["description"],
+            lore=data.get("lore"),
+            ambient_description=data.get("ambient_description"),
+            available_quests=data.get("available_quests", []),
+            npc_ids=data.get("npc_ids", []),
+            discoverable_locations=data.get("discoverable_locations", []),
+            is_starting_location=data.get("is_starting_location", False),
+            tags=data.get("tags", []),
+        )
+
+    def load_all_locations(self) -> List[Location]:
+        """
+        Load all locations from all region directories.
+
+        Returns:
+            List of Location instances
+        """
+        locations = []
+
+        if not self.data_dir.exists():
+            logger.error("Location data directory does not exist", data_dir=str(self.data_dir))
+            return locations
+
+        for region_dir in self.data_dir.iterdir():
+            # Skip non-directories and the regions folder
+            if not region_dir.is_dir() or region_dir.name == "regions":
+                continue
+
+            for file_path in region_dir.glob("*.yaml"):
+                location = self._load_location_file(file_path)
+                if location:
+                    locations.append(location)
+
+        logger.info("All locations loaded", count=len(locations))
+        return locations
+
+    def load_region(self, region_id: str) -> Optional[Region]:
+        """
+        Load a region definition.
+
+        Args:
+            region_id: Unique region identifier (e.g., "crossville")
+
+        Returns:
+            Region instance or None if not found
+        """
+        # Check cache first
+        if region_id in self._region_cache:
+            logger.debug("Region loaded from cache", region_id=region_id)
+            return self._region_cache[region_id]
+
+        file_path = self.data_dir / "regions" / f"{region_id}.yaml"
+
+        if not file_path.exists():
+            logger.warning("Region file not found", region_id=region_id)
+            return None
+
+        try:
+            with open(file_path, 'r') as f:
+                data = yaml.safe_load(f)
+
+            region = Region.from_dict(data)
+            self._region_cache[region_id] = region
+
+            logger.info("Region loaded successfully", region_id=region_id)
+            return region
+
+        except Exception as e:
+            logger.error("Failed to load region", region_id=region_id, error=str(e))
+            return None
+
+    def get_locations_in_region(self, region_id: str) -> List[Location]:
+        """
+        Get all locations belonging to a specific region.
+
+        Args:
+            region_id: Region identifier
+
+        Returns:
+            List of Location instances in this region
+        """
+        # Load all locations if cache is empty
+        if not self._location_cache:
+            self.load_all_locations()
+
+        return [
+            loc for loc in self._location_cache.values()
+            if loc.region_id == region_id
+        ]
+
+    def get_starting_locations(self) -> List[Location]:
+        """
+        Get all locations that can be starting points.
+
+        Returns:
+            List of Location instances marked as starting locations
+        """
+        # Load all locations if cache is empty
+        if not self._location_cache:
+            self.load_all_locations()
+
+        return [
+            loc for loc in self._location_cache.values()
+            if loc.is_starting_location
+        ]
+
+    def get_location_by_type(self, location_type: LocationType) -> List[Location]:
+        """
+        Get all locations of a specific type.
+
+        Args:
+            location_type: Type to filter by
+
+        Returns:
+            List of Location instances of this type
+        """
+        # Load all locations if cache is empty
+        if not self._location_cache:
+            self.load_all_locations()
+
+        return [
+            loc for loc in self._location_cache.values()
+            if loc.location_type == location_type
+        ]
+
+    def get_all_location_ids(self) -> List[str]:
+        """
+        Get a list of all available location IDs.
+
+        Returns:
+            List of location IDs
+        """
+        # Load all locations if cache is empty
+        if not self._location_cache:
+            self.load_all_locations()
+
+        return list(self._location_cache.keys())
+
+    def reload_location(self, location_id: str) -> Optional[Location]:
+        """
+        Force reload a location from disk, bypassing cache.
+
+        Useful for development/testing when location definitions change.
+
+        Args:
+            location_id: Unique location identifier
+
+        Returns:
+            Location instance or None if not found
+        """
+        # Remove from cache if present
+        if location_id in self._location_cache:
+            del self._location_cache[location_id]
+
+        return self.load_location(location_id)
+
+    def clear_cache(self) -> None:
+        """Clear all cached data. Useful for testing."""
+        self._location_cache.clear()
+        self._region_cache.clear()
+        logger.info("Location cache cleared")
+
+
+# Global singleton instance
+_loader_instance: Optional[LocationLoader] = None
+
+
+def get_location_loader() -> LocationLoader:
+    """
+    Get the global LocationLoader instance.
+
+    Returns:
+        Singleton LocationLoader instance
+    """
+    global _loader_instance
+    if _loader_instance is None:
+        _loader_instance = LocationLoader()
+    return _loader_instance

api/app/services/npc_loader.py

@@ -0,0 +1,385 @@
+"""
+NPCLoader service for loading NPC definitions from YAML files.
+
+This service reads NPC configuration files and converts them into NPC
+dataclass instances, providing caching for performance. NPCs are organized
+by region subdirectories.
+"""
+
+import yaml
+from pathlib import Path
+from typing import Dict, List, Optional
+import structlog
+
+from app.models.npc import (
+    NPC,
+    NPCPersonality,
+    NPCAppearance,
+    NPCKnowledge,
+    NPCKnowledgeCondition,
+    NPCRelationship,
+    NPCInventoryItem,
+    NPCDialogueHooks,
+)
+
+logger = structlog.get_logger(__name__)
+
+
+class NPCLoader:
+    """
+    Loads NPC definitions from YAML configuration files.
+
+    NPCs are organized in region subdirectories:
+    /app/data/npcs/
+      crossville/
+        npc_grom_001.yaml
+        npc_mira_001.yaml
+
+    This allows game designers to define NPCs without touching code.
+    """
+
+    def __init__(self, data_dir: Optional[str] = None):
+        """
+        Initialize the NPC loader.
+
+        Args:
+            data_dir: Path to directory containing NPC YAML files.
+                     Defaults to /app/data/npcs/
+        """
+        if data_dir is None:
+            # Default to app/data/npcs relative to this file
+            current_file = Path(__file__)
+            app_dir = current_file.parent.parent  # Go up to /app
+            data_dir = str(app_dir / "data" / "npcs")
+
+        self.data_dir = Path(data_dir)
+        self._npc_cache: Dict[str, NPC] = {}
+        self._location_npc_cache: Dict[str, List[str]] = {}
+
+        logger.info("NPCLoader initialized", data_dir=str(self.data_dir))
+
+    def load_npc(self, npc_id: str) -> Optional[NPC]:
+        """
+        Load a single NPC by ID.
+
+        Searches all region subdirectories for the NPC file.
+
+        Args:
+            npc_id: Unique NPC identifier (e.g., "npc_grom_001")
+
+        Returns:
+            NPC instance or None if not found
+        """
+        # Check cache first
+        if npc_id in self._npc_cache:
+            logger.debug("NPC loaded from cache", npc_id=npc_id)
+            return self._npc_cache[npc_id]
+
+        # Search in region subdirectories
+        if not self.data_dir.exists():
+            logger.error("NPC data directory does not exist", data_dir=str(self.data_dir))
+            return None
+
+        for region_dir in self.data_dir.iterdir():
+            if not region_dir.is_dir():
+                continue
+
+            file_path = region_dir / f"{npc_id}.yaml"
+            if file_path.exists():
+                return self._load_npc_file(file_path)
+
+        logger.warning("NPC not found", npc_id=npc_id)
+        return None
+
+    def _load_npc_file(self, file_path: Path) -> Optional[NPC]:
+        """
+        Load an NPC from a specific file.
+
+        Args:
+            file_path: Path to the YAML file
+
+        Returns:
+            NPC instance or None if loading fails
+        """
+        try:
+            with open(file_path, 'r') as f:
+                data = yaml.safe_load(f)
+
+            npc = self._parse_npc_data(data)
+            self._npc_cache[npc.npc_id] = npc
+
+            # Update location cache
+            if npc.location_id not in self._location_npc_cache:
+                self._location_npc_cache[npc.location_id] = []
+            if npc.npc_id not in self._location_npc_cache[npc.location_id]:
+                self._location_npc_cache[npc.location_id].append(npc.npc_id)
+
+            logger.info("NPC loaded successfully", npc_id=npc.npc_id)
+            return npc
+
+        except Exception as e:
+            logger.error("Failed to load NPC", file=str(file_path), error=str(e))
+            return None
+
+    def _parse_npc_data(self, data: Dict) -> NPC:
+        """
+        Parse YAML data into an NPC dataclass.
+
+        Args:
+            data: Dictionary loaded from YAML file
+
+        Returns:
+            NPC instance
+
+        Raises:
+            ValueError: If data is invalid or missing required fields
+        """
+        # Validate required fields
+        required_fields = ["npc_id", "name", "role", "location_id"]
+        for field in required_fields:
+            if field not in data:
+                raise ValueError(f"Missing required field: {field}")
+
+        # Parse personality
+        personality_data = data.get("personality", {})
+        personality = NPCPersonality(
+            traits=personality_data.get("traits", []),
+            speech_style=personality_data.get("speech_style", ""),
+            quirks=personality_data.get("quirks", []),
+        )
+
+        # Parse appearance
+        appearance_data = data.get("appearance", {})
+        if isinstance(appearance_data, str):
+            appearance = NPCAppearance(brief=appearance_data)
+        else:
+            appearance = NPCAppearance(
+                brief=appearance_data.get("brief", ""),
+                detailed=appearance_data.get("detailed"),
+            )
+
+        # Parse knowledge (optional)
+        knowledge = None
+        if data.get("knowledge"):
+            knowledge_data = data["knowledge"]
+            conditions = [
+                NPCKnowledgeCondition(
+                    condition=c.get("condition", ""),
+                    reveals=c.get("reveals", ""),
+                )
+                for c in knowledge_data.get("will_share_if", [])
+            ]
+            knowledge = NPCKnowledge(
+                public=knowledge_data.get("public", []),
+                secret=knowledge_data.get("secret", []),
+                will_share_if=conditions,
+            )
+
+        # Parse relationships
+        relationships = [
+            NPCRelationship(
+                npc_id=r["npc_id"],
+                attitude=r["attitude"],
+                reason=r.get("reason"),
+            )
+            for r in data.get("relationships", [])
+        ]
+
+        # Parse inventory
+        inventory = []
+        for item_data in data.get("inventory_for_sale", []):
+            # Handle shorthand format: { item: "ale", price: 2 }
+            item_id = item_data.get("item_id") or item_data.get("item", "")
+            inventory.append(NPCInventoryItem(
+                item_id=item_id,
+                price=item_data.get("price", 0),
+                quantity=item_data.get("quantity"),
+            ))
+
+        # Parse dialogue hooks (optional)
+        dialogue_hooks = None
+        if data.get("dialogue_hooks"):
+            hooks_data = data["dialogue_hooks"]
+            dialogue_hooks = NPCDialogueHooks(
+                greeting=hooks_data.get("greeting"),
+                farewell=hooks_data.get("farewell"),
+                busy=hooks_data.get("busy"),
+                quest_complete=hooks_data.get("quest_complete"),
+            )
+
+        return NPC(
+            npc_id=data["npc_id"],
+            name=data["name"],
+            role=data["role"],
+            location_id=data["location_id"],
+            personality=personality,
+            appearance=appearance,
+            knowledge=knowledge,
+            relationships=relationships,
+            inventory_for_sale=inventory,
+            dialogue_hooks=dialogue_hooks,
+            quest_giver_for=data.get("quest_giver_for", []),
+            reveals_locations=data.get("reveals_locations", []),
+            tags=data.get("tags", []),
+        )
+
+    def load_all_npcs(self) -> List[NPC]:
+        """
+        Load all NPCs from all region directories.
+
+        Returns:
+            List of NPC instances
+        """
+        npcs = []
+
+        if not self.data_dir.exists():
+            logger.error("NPC data directory does not exist", data_dir=str(self.data_dir))
+            return npcs
+
+        for region_dir in self.data_dir.iterdir():
+            if not region_dir.is_dir():
+                continue
+
+            for file_path in region_dir.glob("*.yaml"):
+                npc = self._load_npc_file(file_path)
+                if npc:
+                    npcs.append(npc)
+
+        logger.info("All NPCs loaded", count=len(npcs))
+        return npcs
+
+    def get_npcs_at_location(self, location_id: str) -> List[NPC]:
+        """
+        Get all NPCs at a specific location.
+
+        Args:
+            location_id: Location identifier
+
+        Returns:
+            List of NPC instances at this location
+        """
+        # Ensure all NPCs are loaded
+        if not self._npc_cache:
+            self.load_all_npcs()
+
+        npc_ids = self._location_npc_cache.get(location_id, [])
+        return [
+            self._npc_cache[npc_id]
+            for npc_id in npc_ids
+            if npc_id in self._npc_cache
+        ]
+
+    def get_npc_ids_at_location(self, location_id: str) -> List[str]:
+        """
+        Get NPC IDs at a specific location.
+
+        Args:
+            location_id: Location identifier
+
+        Returns:
+            List of NPC IDs at this location
+        """
+        # Ensure all NPCs are loaded
+        if not self._npc_cache:
+            self.load_all_npcs()
+
+        return self._location_npc_cache.get(location_id, [])
+
+    def get_npcs_by_tag(self, tag: str) -> List[NPC]:
+        """
+        Get all NPCs with a specific tag.
+
+        Args:
+            tag: Tag to filter by (e.g., "merchant", "quest_giver")
+
+        Returns:
+            List of NPC instances with this tag
+        """
+        # Ensure all NPCs are loaded
+        if not self._npc_cache:
+            self.load_all_npcs()
+
+        return [
+            npc for npc in self._npc_cache.values()
+            if tag in npc.tags
+        ]
+
+    def get_quest_givers(self, quest_id: str) -> List[NPC]:
+        """
+        Get all NPCs that can give a specific quest.
+
+        Args:
+            quest_id: Quest identifier
+
+        Returns:
+            List of NPC instances that give this quest
+        """
+        # Ensure all NPCs are loaded
+        if not self._npc_cache:
+            self.load_all_npcs()
+
+        return [
+            npc for npc in self._npc_cache.values()
+            if quest_id in npc.quest_giver_for
+        ]
+
+    def get_all_npc_ids(self) -> List[str]:
+        """
+        Get a list of all available NPC IDs.
+
+        Returns:
+            List of NPC IDs
+        """
+        # Ensure all NPCs are loaded
+        if not self._npc_cache:
+            self.load_all_npcs()
+
+        return list(self._npc_cache.keys())
+
+    def reload_npc(self, npc_id: str) -> Optional[NPC]:
+        """
+        Force reload an NPC from disk, bypassing cache.
+
+        Useful for development/testing when NPC definitions change.
+
+        Args:
+            npc_id: Unique NPC identifier
+
+        Returns:
+            NPC instance or None if not found
+        """
+        # Remove from caches if present
+        if npc_id in self._npc_cache:
+            old_npc = self._npc_cache[npc_id]
+            # Remove from location cache
+            if old_npc.location_id in self._location_npc_cache:
+                self._location_npc_cache[old_npc.location_id] = [
+                    n for n in self._location_npc_cache[old_npc.location_id]
+                    if n != npc_id
+                ]
+            del self._npc_cache[npc_id]
+
+        return self.load_npc(npc_id)
+
+    def clear_cache(self) -> None:
+        """Clear all cached data. Useful for testing."""
+        self._npc_cache.clear()
+        self._location_npc_cache.clear()
+        logger.info("NPC cache cleared")
+
+
+# Global singleton instance
+_loader_instance: Optional[NPCLoader] = None
+
+
+def get_npc_loader() -> NPCLoader:
+    """
+    Get the global NPCLoader instance.
+
+    Returns:
+        Singleton NPCLoader instance
+    """
+    global _loader_instance
+    if _loader_instance is None:
+        _loader_instance = NPCLoader()
+    return _loader_instance

api/app/services/origin_service.py

@@ -0,0 +1,236 @@
+"""
+OriginService for loading character origin definitions from YAML files.
+
+This service reads origin configuration and converts it into Origin
+dataclass instances, providing caching for performance.
+"""
+
+import yaml
+from pathlib import Path
+from typing import Dict, List, Optional
+import structlog
+
+from app.models.origins import Origin, StartingLocation, StartingBonus
+
+logger = structlog.get_logger(__name__)
+
+
+class OriginService:
+    """
+    Loads character origin definitions from YAML configuration.
+
+    Origins define character backstories, starting locations, and narrative
+    hooks that the AI DM uses to create personalized gameplay experiences.
+    All origin definitions are stored in /app/data/origins.yaml.
+    """
+
+    def __init__(self, data_file: Optional[str] = None):
+        """
+        Initialize the origin service.
+
+        Args:
+            data_file: Path to origins YAML file.
+                      Defaults to /app/data/origins.yaml
+        """
+        if data_file is None:
+            # Default to app/data/origins.yaml relative to this file
+            current_file = Path(__file__)
+            app_dir = current_file.parent.parent  # Go up to /app
+            data_file = str(app_dir / "data" / "origins.yaml")
+
+        self.data_file = Path(data_file)
+        self._origins_cache: Dict[str, Origin] = {}
+        self._all_origins_loaded = False
+
+        logger.info("OriginService initialized", data_file=str(self.data_file))
+
+    def load_origin(self, origin_id: str) -> Optional[Origin]:
+        """
+        Load a single origin by ID.
+
+        Args:
+            origin_id: Unique origin identifier (e.g., "soul_revenant")
+
+        Returns:
+            Origin instance or None if not found
+        """
+        # Check cache first
+        if origin_id in self._origins_cache:
+            logger.debug("Origin loaded from cache", origin_id=origin_id)
+            return self._origins_cache[origin_id]
+
+        # Load all origins if not already loaded
+        if not self._all_origins_loaded:
+            self._load_all_origins()
+
+        # Return from cache after loading
+        origin = self._origins_cache.get(origin_id)
+        if origin:
+            logger.info("Origin loaded successfully", origin_id=origin_id)
+        else:
+            logger.warning("Origin not found", origin_id=origin_id)
+
+        return origin
+
+    def load_all_origins(self) -> List[Origin]:
+        """
+        Load all origins from the data file.
+
+        Returns:
+            List of Origin instances
+        """
+        if self._all_origins_loaded and self._origins_cache:
+            logger.debug("All origins loaded from cache")
+            return list(self._origins_cache.values())
+
+        return self._load_all_origins()
+
+    def _load_all_origins(self) -> List[Origin]:
+        """
+        Internal method to load all origins from YAML.
+
+        Returns:
+            List of Origin instances
+        """
+        if not self.data_file.exists():
+            logger.error("Origins data file does not exist", data_file=str(self.data_file))
+            return []
+
+        try:
+            # Load YAML file
+            with open(self.data_file, 'r') as f:
+                data = yaml.safe_load(f)
+
+            origins_data = data.get("origins", {})
+            origins = []
+
+            # Parse each origin
+            for origin_id, origin_data in origins_data.items():
+                try:
+                    origin = self._parse_origin_data(origin_id, origin_data)
+                    self._origins_cache[origin_id] = origin
+                    origins.append(origin)
+                except Exception as e:
+                    logger.error("Failed to parse origin", origin_id=origin_id, error=str(e))
+                    continue
+
+            self._all_origins_loaded = True
+            logger.info("All origins loaded successfully", count=len(origins))
+            return origins
+
+        except Exception as e:
+            logger.error("Failed to load origins file", error=str(e))
+            return []
+
+    def get_origin_by_id(self, origin_id: str) -> Optional[Origin]:
+        """
+        Get an origin by ID (alias for load_origin).
+
+        Args:
+            origin_id: Unique origin identifier
+
+        Returns:
+            Origin instance or None if not found
+        """
+        return self.load_origin(origin_id)
+
+    def get_all_origin_ids(self) -> List[str]:
+        """
+        Get a list of all available origin IDs.
+
+        Returns:
+            List of origin IDs (e.g., ["soul_revenant", "memory_thief"])
+        """
+        if not self._all_origins_loaded:
+            self._load_all_origins()
+
+        return list(self._origins_cache.keys())
+
+    def reload_origins(self) -> List[Origin]:
+        """
+        Force reload all origins from disk, bypassing cache.
+
+        Useful for development/testing when origin definitions change.
+
+        Returns:
+            List of Origin instances
+        """
+        self.clear_cache()
+        return self._load_all_origins()
+
+    def clear_cache(self):
+        """Clear the origins cache. Useful for testing."""
+        self._origins_cache.clear()
+        self._all_origins_loaded = False
+        logger.info("Origins cache cleared")
+
+    def _parse_origin_data(self, origin_id: str, data: Dict) -> Origin:
+        """
+        Parse YAML data into an Origin dataclass.
+
+        Args:
+            origin_id: The origin's unique identifier
+            data: Dictionary loaded from YAML file
+
+        Returns:
+            Origin instance
+
+        Raises:
+            ValueError: If data is invalid or missing required fields
+        """
+        # Validate required fields
+        required_fields = ["name", "description", "starting_location"]
+        for field in required_fields:
+            if field not in data:
+                raise ValueError(f"Missing required field in origin '{origin_id}': {field}")
+
+        # Parse starting location
+        location_data = data["starting_location"]
+        starting_location = StartingLocation(
+            id=location_data.get("id", ""),
+            name=location_data.get("name", ""),
+            region=location_data.get("region", ""),
+            description=location_data.get("description", "")
+        )
+
+        # Parse starting bonus (optional)
+        starting_bonus = None
+        if "starting_bonus" in data:
+            bonus_data = data["starting_bonus"]
+            starting_bonus = StartingBonus(
+                trait=bonus_data.get("trait", ""),
+                description=bonus_data.get("description", ""),
+                effect=bonus_data.get("effect", "")
+            )
+
+        # Parse narrative hooks (optional)
+        narrative_hooks = data.get("narrative_hooks", [])
+
+        # Create Origin instance
+        origin = Origin(
+            id=data.get("id", origin_id),  # Use provided ID or fall back to key
+            name=data["name"],
+            description=data["description"],
+            starting_location=starting_location,
+            narrative_hooks=narrative_hooks,
+            starting_bonus=starting_bonus
+        )
+
+        return origin
+
+
+# Global instance for convenience
+_service_instance: Optional[OriginService] = None
+
+
+def get_origin_service() -> OriginService:
+    """
+    Get the global OriginService instance.
+
+    Returns:
+        Singleton OriginService instance
+    """
+    global _service_instance
+    if _service_instance is None:
+        _service_instance = OriginService()
+    return _service_instance

api/app/services/outcome_service.py

@@ -0,0 +1,373 @@
+"""
+Outcome determination service for Code of Conquest.
+
+This service handles all code-determined game outcomes before they're passed
+to AI for narration. It uses the dice mechanics system to determine success/failure
+and selects appropriate rewards from loot tables.
+"""
+
+import random
+import yaml
+import structlog
+from pathlib import Path
+from dataclasses import dataclass
+from typing import Optional, List, Dict, Any
+
+from app.models.character import Character
+from app.game_logic.dice import (
+    CheckResult, SkillType, Difficulty,
+    skill_check, get_stat_for_skill, perception_check
+)
+
+
+logger = structlog.get_logger(__name__)
+
+
+@dataclass
+class ItemFound:
+    """
+    Represents an item found during a search.
+
+    Uses template key from generic_items.yaml.
+    """
+    template_key: str
+    name: str
+    description: str
+    value: int
+
+    def to_dict(self) -> dict:
+        """Serialize for API response."""
+        return {
+            "template_key": self.template_key,
+            "name": self.name,
+            "description": self.description,
+            "value": self.value,
+        }
+
+
+@dataclass
+class SearchOutcome:
+    """
+    Complete result of a search action.
+
+    Includes the dice check result and any items/gold found.
+    """
+    check_result: CheckResult
+    items_found: List[ItemFound]
+    gold_found: int
+
+    def to_dict(self) -> dict:
+        """Serialize for API response."""
+        return {
+            "check_result": self.check_result.to_dict(),
+            "items_found": [item.to_dict() for item in self.items_found],
+            "gold_found": self.gold_found,
+        }
+
+
+@dataclass
+class SkillCheckOutcome:
+    """
+    Result of a generic skill check.
+
+    Used for persuasion, lockpicking, stealth, etc.
+    """
+    check_result: CheckResult
+    context: Dict[str, Any]  # Additional context for AI narration
+
+    def to_dict(self) -> dict:
+        """Serialize for API response."""
+        return {
+            "check_result": self.check_result.to_dict(),
+            "context": self.context,
+        }
+
+
+class OutcomeService:
+    """
+    Service for determining game action outcomes.
+
+    Handles all dice rolls and loot selection before passing to AI.
+    """
+
+    def __init__(self):
+        """Initialize the outcome service with loot tables and item templates."""
+        self._loot_tables: Dict[str, Any] = {}
+        self._item_templates: Dict[str, Any] = {}
+        self._load_data()
+
+    def _load_data(self) -> None:
+        """Load loot tables and item templates from YAML files."""
+        data_dir = Path(__file__).parent.parent / "data"
+
+        # Load loot tables
+        loot_path = data_dir / "loot_tables.yaml"
+        if loot_path.exists():
+            with open(loot_path, "r") as f:
+                self._loot_tables = yaml.safe_load(f)
+            logger.info("loaded_loot_tables", count=len(self._loot_tables))
+        else:
+            logger.warning("loot_tables_not_found", path=str(loot_path))
+
+        # Load generic item templates
+        items_path = data_dir / "generic_items.yaml"
+        if items_path.exists():
+            with open(items_path, "r") as f:
+                data = yaml.safe_load(f)
+                self._item_templates = data.get("templates", {})
+            logger.info("loaded_item_templates", count=len(self._item_templates))
+        else:
+            logger.warning("item_templates_not_found", path=str(items_path))
+
+    def determine_search_outcome(
+        self,
+        character: Character,
+        location_type: str,
+        dc: int = 12,
+        bonus: int = 0
+    ) -> SearchOutcome:
+        """
+        Determine the outcome of a search action.
+
+        Uses a perception check to determine success, then selects items
+        from the appropriate loot table based on the roll margin.
+
+        Args:
+            character: The character performing the search
+            location_type: Type of location (forest, cave, town, etc.)
+            dc: Difficulty class (default 12 = easy-medium)
+            bonus: Additional bonus to the check
+
+        Returns:
+            SearchOutcome with check result, items found, and gold found
+        """
+        # Get character's effective wisdom for perception
+        effective_stats = character.get_effective_stats()
+        wisdom = effective_stats.wisdom
+
+        # Perform the perception check
+        check_result = perception_check(wisdom, dc, bonus)
+
+        # Determine loot based on result
+        items_found: List[ItemFound] = []
+        gold_found: int = 0
+
+        if check_result.success:
+            # Get loot table for this location (fall back to default)
+            loot_table = self._loot_tables.get(
+                location_type.lower(),
+                self._loot_tables.get("default", {})
+            )
+
+            # Select item rarity based on margin
+            if check_result.margin >= 10:
+                rarity = "rare"
+            elif check_result.margin >= 5:
+                rarity = "uncommon"
+            else:
+                rarity = "common"
+
+            # Get items for this rarity
+            item_keys = loot_table.get(rarity, [])
+            if item_keys:
+                # Select 1-2 items based on margin
+                num_items = 1 if check_result.margin < 8 else 2
+                selected_keys = random.sample(
+                    item_keys,
+                    min(num_items, len(item_keys))
+                )
+
+                for key in selected_keys:
+                    template = self._item_templates.get(key)
+                    if template:
+                        items_found.append(ItemFound(
+                            template_key=key,
+                            name=template.get("name", key.title()),
+                            description=template.get("description", ""),
+                            value=template.get("value", 1),
+                        ))
+
+            # Calculate gold found
+            gold_config = loot_table.get("gold", {})
+            if gold_config:
+                min_gold = gold_config.get("min", 0)
+                max_gold = gold_config.get("max", 10)
+                bonus_per_margin = gold_config.get("bonus_per_margin", 0)
+
+                base_gold = random.randint(min_gold, max_gold)
+                margin_bonus = check_result.margin * bonus_per_margin
+                gold_found = base_gold + margin_bonus
+
+        logger.info(
+            "search_outcome_determined",
+            character_id=character.character_id,
+            location_type=location_type,
+            dc=dc,
+            success=check_result.success,
+            margin=check_result.margin,
+            items_count=len(items_found),
+            gold_found=gold_found
+        )
+
+        return SearchOutcome(
+            check_result=check_result,
+            items_found=items_found,
+            gold_found=gold_found
+        )
+
+    def determine_skill_check_outcome(
+        self,
+        character: Character,
+        skill_type: SkillType,
+        dc: int,
+        bonus: int = 0,
+        context: Optional[Dict[str, Any]] = None
+    ) -> SkillCheckOutcome:
+        """
+        Determine the outcome of a generic skill check.
+
+        Args:
+            character: The character performing the check
+            skill_type: The type of skill check (PERSUASION, STEALTH, etc.)
+            dc: Difficulty class to beat
+            bonus: Additional bonus to the check
+            context: Optional context for AI narration (e.g., NPC name, door type)
+
+        Returns:
+            SkillCheckOutcome with check result and context
+        """
+        # Get the appropriate stat for this skill
+        stat_name = get_stat_for_skill(skill_type)
+        effective_stats = character.get_effective_stats()
+        stat_value = getattr(effective_stats, stat_name, 10)
+
+        # Perform the check
+        check_result = skill_check(stat_value, dc, skill_type, bonus)
+
+        # Build outcome context
+        outcome_context = context or {}
+        outcome_context["skill_used"] = skill_type.name.lower()
+        outcome_context["stat_used"] = stat_name
+
+        logger.info(
+            "skill_check_outcome_determined",
+            character_id=character.character_id,
+            skill=skill_type.name,
+            stat=stat_name,
+            dc=dc,
+            success=check_result.success,
+            margin=check_result.margin
+        )
+
+        return SkillCheckOutcome(
+            check_result=check_result,
+            context=outcome_context
+        )
+
+    def determine_persuasion_outcome(
+        self,
+        character: Character,
+        dc: int,
+        npc_name: Optional[str] = None,
+        bonus: int = 0
+    ) -> SkillCheckOutcome:
+        """
+        Convenience method for persuasion checks.
+
+        Args:
+            character: The character attempting persuasion
+            dc: Difficulty class based on NPC disposition
+            npc_name: Name of the NPC being persuaded
+            bonus: Additional bonus
+
+        Returns:
+            SkillCheckOutcome
+        """
+        context = {"npc_name": npc_name} if npc_name else {}
+        return self.determine_skill_check_outcome(
+            character,
+            SkillType.PERSUASION,
+            dc,
+            bonus,
+            context
+        )
+
+    def determine_stealth_outcome(
+        self,
+        character: Character,
+        dc: int,
+        situation: Optional[str] = None,
+        bonus: int = 0
+    ) -> SkillCheckOutcome:
+        """
+        Convenience method for stealth checks.
+
+        Args:
+            character: The character attempting stealth
+            dc: Difficulty class based on environment/observers
+            situation: Description of what they're sneaking past
+            bonus: Additional bonus
+
+        Returns:
+            SkillCheckOutcome
+        """
+        context = {"situation": situation} if situation else {}
+        return self.determine_skill_check_outcome(
+            character,
+            SkillType.STEALTH,
+            dc,
+            bonus,
+            context
+        )
+
+    def determine_lockpicking_outcome(
+        self,
+        character: Character,
+        dc: int,
+        lock_description: Optional[str] = None,
+        bonus: int = 0
+    ) -> SkillCheckOutcome:
+        """
+        Convenience method for lockpicking checks.
+
+        Args:
+            character: The character attempting to pick the lock
+            dc: Difficulty class based on lock quality
+            lock_description: Description of the lock/door
+            bonus: Additional bonus (e.g., from thieves' tools)
+
+        Returns:
+            SkillCheckOutcome
+        """
+        context = {"lock_description": lock_description} if lock_description else {}
+        return self.determine_skill_check_outcome(
+            character,
+            SkillType.LOCKPICKING,
+            dc,
+            bonus,
+            context
+        )
+
+    def get_dc_for_difficulty(self, difficulty: str) -> int:
+        """
+        Get the DC value for a named difficulty.
+
+        Args:
+            difficulty: Difficulty name (trivial, easy, medium, hard, very_hard)
+
+        Returns:
+            DC value
+        """
+        difficulty_map = {
+            "trivial": Difficulty.TRIVIAL.value,
+            "easy": Difficulty.EASY.value,
+            "medium": Difficulty.MEDIUM.value,
+            "hard": Difficulty.HARD.value,
+            "very_hard": Difficulty.VERY_HARD.value,
+            "nearly_impossible": Difficulty.NEARLY_IMPOSSIBLE.value,
+        }
+        return difficulty_map.get(difficulty.lower(), Difficulty.MEDIUM.value)
+
+
+# Global instance for use in API endpoints
+outcome_service = OutcomeService()

api/app/services/rate_limiter_service.py

@@ -0,0 +1,602 @@
+"""
+Rate Limiter Service
+
+This module implements tier-based rate limiting for AI requests using Redis
+for distributed counting. Each user tier has a different daily limit for
+AI-generated turns.
+
+Usage:
+    from app.services.rate_limiter_service import RateLimiterService, RateLimitExceeded
+    from app.ai.model_selector import UserTier
+
+    # Initialize service
+    rate_limiter = RateLimiterService()
+
+    # Check and increment usage
+    try:
+        rate_limiter.check_rate_limit("user_123", UserTier.FREE)
+        rate_limiter.increment_usage("user_123")
+    except RateLimitExceeded as e:
+        print(f"Rate limit exceeded: {e}")
+
+    # Get remaining turns
+    remaining = rate_limiter.get_remaining_turns("user_123", UserTier.FREE)
+"""
+
+from datetime import date, datetime, timezone, timedelta
+from typing import Optional
+
+from app.services.redis_service import RedisService, RedisServiceError
+from app.ai.model_selector import UserTier
+from app.utils.logging import get_logger
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+
+class RateLimitExceeded(Exception):
+    """
+    Raised when a user has exceeded their daily rate limit.
+
+    Attributes:
+        user_id: The user who exceeded the limit
+        user_tier: The user's subscription tier
+        limit: The daily limit for their tier
+        current_usage: The current usage count
+        reset_time: UTC timestamp when the limit resets
+    """
+
+    def __init__(
+        self,
+        user_id: str,
+        user_tier: UserTier,
+        limit: int,
+        current_usage: int,
+        reset_time: datetime
+    ):
+        self.user_id = user_id
+        self.user_tier = user_tier
+        self.limit = limit
+        self.current_usage = current_usage
+        self.reset_time = reset_time
+
+        message = (
+            f"Rate limit exceeded for user {user_id} ({user_tier.value} tier). "
+            f"Used {current_usage}/{limit} turns. Resets at {reset_time.isoformat()}"
+        )
+        super().__init__(message)
+
+
+class RateLimiterService:
+    """
+    Service for managing tier-based rate limiting.
+
+    This service uses Redis to track daily AI usage per user and enforces
+    limits based on subscription tier. Counters reset daily at midnight UTC.
+
+    Tier Limits:
+        - Free: 20 turns/day
+        - Basic: 50 turns/day
+        - Premium: 100 turns/day
+        - Elite: 200 turns/day
+
+    Attributes:
+        redis: RedisService instance for counter storage
+        tier_limits: Mapping of tier to daily turn limit
+    """
+
+    # Daily turn limits per tier
+    TIER_LIMITS = {
+        UserTier.FREE: 20,
+        UserTier.BASIC: 50,
+        UserTier.PREMIUM: 100,
+        UserTier.ELITE: 200,
+    }
+
+    # Daily DM question limits per tier
+    DM_QUESTION_LIMITS = {
+        UserTier.FREE: 10,
+        UserTier.BASIC: 20,
+        UserTier.PREMIUM: 50,
+        UserTier.ELITE: -1,  # -1 means unlimited
+    }
+
+    # Redis key prefix for rate limit counters
+    KEY_PREFIX = "rate_limit:daily:"
+    DM_QUESTION_PREFIX = "rate_limit:dm_questions:"
+
+    def __init__(self, redis_service: Optional[RedisService] = None):
+        """
+        Initialize the rate limiter service.
+
+        Args:
+            redis_service: Optional RedisService instance. If not provided,
+                          a new instance will be created.
+        """
+        self.redis = redis_service or RedisService()
+
+        logger.info(
+            "RateLimiterService initialized",
+            tier_limits=self.TIER_LIMITS
+        )
+
+    def _get_daily_key(self, user_id: str, day: Optional[date] = None) -> str:
+        """
+        Generate the Redis key for a user's daily counter.
+
+        Args:
+            user_id: The user ID
+            day: The date (defaults to today UTC)
+
+        Returns:
+            Redis key in format "rate_limit:daily:user_id:YYYY-MM-DD"
+        """
+        if day is None:
+            day = datetime.now(timezone.utc).date()
+
+        return f"{self.KEY_PREFIX}{user_id}:{day.isoformat()}"
+
+    def _get_seconds_until_midnight_utc(self) -> int:
+        """
+        Calculate seconds remaining until midnight UTC.
+
+        Returns:
+            Number of seconds until the next UTC midnight
+        """
+        now = datetime.now(timezone.utc)
+        tomorrow = datetime(
+            now.year, now.month, now.day,
+            tzinfo=timezone.utc
+        ) + timedelta(days=1)
+
+        return int((tomorrow - now).total_seconds())
+
+    def _get_reset_time(self) -> datetime:
+        """
+        Get the UTC datetime when the rate limit resets.
+
+        Returns:
+            Datetime of next midnight UTC
+        """
+        now = datetime.now(timezone.utc)
+        return datetime(
+            now.year, now.month, now.day,
+            tzinfo=timezone.utc
+        ) + timedelta(days=1)
+
+    def get_limit_for_tier(self, user_tier: UserTier) -> int:
+        """
+        Get the daily turn limit for a specific tier.
+
+        Args:
+            user_tier: The user's subscription tier
+
+        Returns:
+            Daily turn limit for the tier
+        """
+        return self.TIER_LIMITS.get(user_tier, self.TIER_LIMITS[UserTier.FREE])
+
+    def get_current_usage(self, user_id: str) -> int:
+        """
+        Get the current daily usage count for a user.
+
+        Args:
+            user_id: The user ID to check
+
+        Returns:
+            Current usage count (0 if no usage today)
+
+        Raises:
+            RedisServiceError: If Redis operation fails
+        """
+        key = self._get_daily_key(user_id)
+
+        try:
+            value = self.redis.get(key)
+            usage = int(value) if value else 0
+
+            logger.debug(
+                "Retrieved current usage",
+                user_id=user_id,
+                usage=usage
+            )
+
+            return usage
+
+        except (ValueError, TypeError) as e:
+            logger.error(
+                "Invalid usage value in Redis",
+                user_id=user_id,
+                error=str(e)
+            )
+            return 0
+
+    def check_rate_limit(self, user_id: str, user_tier: UserTier) -> None:
+        """
+        Check if a user has exceeded their daily rate limit.
+
+        This method checks the current usage against the tier limit and
+        raises an exception if the limit has been reached.
+
+        Args:
+            user_id: The user ID to check
+            user_tier: The user's subscription tier
+
+        Raises:
+            RateLimitExceeded: If the user has reached their daily limit
+            RedisServiceError: If Redis operation fails
+        """
+        current_usage = self.get_current_usage(user_id)
+        limit = self.get_limit_for_tier(user_tier)
+
+        if current_usage >= limit:
+            reset_time = self._get_reset_time()
+
+            logger.warning(
+                "Rate limit exceeded",
+                user_id=user_id,
+                user_tier=user_tier.value,
+                current_usage=current_usage,
+                limit=limit,
+                reset_time=reset_time.isoformat()
+            )
+
+            raise RateLimitExceeded(
+                user_id=user_id,
+                user_tier=user_tier,
+                limit=limit,
+                current_usage=current_usage,
+                reset_time=reset_time
+            )
+
+        logger.debug(
+            "Rate limit check passed",
+            user_id=user_id,
+            user_tier=user_tier.value,
+            current_usage=current_usage,
+            limit=limit
+        )
+
+    def increment_usage(self, user_id: str) -> int:
+        """
+        Increment the daily usage counter for a user.
+
+        This method should be called after successfully processing an AI request.
+        The counter will automatically expire at midnight UTC.
+
+        Args:
+            user_id: The user ID to increment
+
+        Returns:
+            The new usage count after incrementing
+
+        Raises:
+            RedisServiceError: If Redis operation fails
+        """
+        key = self._get_daily_key(user_id)
+
+        # Increment the counter
+        new_count = self.redis.incr(key)
+
+        # Set expiration if this is the first increment (new_count == 1)
+        # This ensures the key expires at midnight UTC
+        if new_count == 1:
+            ttl = self._get_seconds_until_midnight_utc()
+            self.redis.expire(key, ttl)
+
+            logger.debug(
+                "Set expiration on new rate limit key",
+                user_id=user_id,
+                ttl=ttl
+            )
+
+        logger.info(
+            "Incremented usage counter",
+            user_id=user_id,
+            new_count=new_count
+        )
+
+        return new_count
+
+    def get_remaining_turns(self, user_id: str, user_tier: UserTier) -> int:
+        """
+        Get the number of remaining turns for a user today.
+
+        Args:
+            user_id: The user ID to check
+            user_tier: The user's subscription tier
+
+        Returns:
+            Number of turns remaining (0 if limit reached)
+        """
+        current_usage = self.get_current_usage(user_id)
+        limit = self.get_limit_for_tier(user_tier)
+
+        remaining = max(0, limit - current_usage)
+
+        logger.debug(
+            "Calculated remaining turns",
+            user_id=user_id,
+            user_tier=user_tier.value,
+            current_usage=current_usage,
+            limit=limit,
+            remaining=remaining
+        )
+
+        return remaining
+
+    def get_usage_info(self, user_id: str, user_tier: UserTier) -> dict:
+        """
+        Get comprehensive usage information for a user.
+
+        Args:
+            user_id: The user ID to check
+            user_tier: The user's subscription tier
+
+        Returns:
+            Dictionary with usage info:
+                - user_id: User identifier
+                - user_tier: Subscription tier
+                - current_usage: Current daily usage
+                - daily_limit: Daily limit for tier
+                - remaining: Remaining turns
+                - reset_time: ISO format UTC reset time
+                - is_limited: Whether limit has been reached
+        """
+        current_usage = self.get_current_usage(user_id)
+        limit = self.get_limit_for_tier(user_tier)
+        remaining = max(0, limit - current_usage)
+        reset_time = self._get_reset_time()
+
+        info = {
+            "user_id": user_id,
+            "user_tier": user_tier.value,
+            "current_usage": current_usage,
+            "daily_limit": limit,
+            "remaining": remaining,
+            "reset_time": reset_time.isoformat(),
+            "is_limited": current_usage >= limit
+        }
+
+        logger.debug("Retrieved usage info", **info)
+
+        return info
+
+    def reset_usage(self, user_id: str) -> bool:
+        """
+        Reset the daily usage counter for a user.
+
+        This is primarily for admin/testing purposes.
+
+        Args:
+            user_id: The user ID to reset
+
+        Returns:
+            True if the counter was deleted, False if it didn't exist
+
+        Raises:
+            RedisServiceError: If Redis operation fails
+        """
+        key = self._get_daily_key(user_id)
+        deleted = self.redis.delete(key)
+
+        logger.info(
+            "Reset usage counter",
+            user_id=user_id,
+            deleted=deleted > 0
+        )
+
+        return deleted > 0
+
+    # ===== DM QUESTION RATE LIMITING =====
+
+    def _get_dm_question_key(self, user_id: str, day: Optional[date] = None) -> str:
+        """
+        Generate the Redis key for a user's daily DM question counter.
+
+        Args:
+            user_id: The user ID
+            day: The date (defaults to today UTC)
+
+        Returns:
+            Redis key in format "rate_limit:dm_questions:user_id:YYYY-MM-DD"
+        """
+        if day is None:
+            day = datetime.now(timezone.utc).date()
+
+        return f"{self.DM_QUESTION_PREFIX}{user_id}:{day.isoformat()}"
+
+    def get_dm_question_limit_for_tier(self, user_tier: UserTier) -> int:
+        """
+        Get the daily DM question limit for a specific tier.
+
+        Args:
+            user_tier: The user's subscription tier
+
+        Returns:
+            Daily DM question limit for the tier (-1 for unlimited)
+        """
+        return self.DM_QUESTION_LIMITS.get(user_tier, self.DM_QUESTION_LIMITS[UserTier.FREE])
+
+    def get_current_dm_usage(self, user_id: str) -> int:
+        """
+        Get the current daily DM question usage count for a user.
+
+        Args:
+            user_id: The user ID to check
+
+        Returns:
+            Current DM question usage count (0 if no usage today)
+
+        Raises:
+            RedisServiceError: If Redis operation fails
+        """
+        key = self._get_dm_question_key(user_id)
+
+        try:
+            value = self.redis.get(key)
+            usage = int(value) if value else 0
+
+            logger.debug(
+                "Retrieved current DM question usage",
+                user_id=user_id,
+                usage=usage
+            )
+
+            return usage
+
+        except (ValueError, TypeError) as e:
+            logger.error(
+                "Invalid DM question usage value in Redis",
+                user_id=user_id,
+                error=str(e)
+            )
+            return 0
+
+    def check_dm_question_limit(self, user_id: str, user_tier: UserTier) -> None:
+        """
+        Check if a user has exceeded their daily DM question limit.
+
+        Args:
+            user_id: The user ID to check
+            user_tier: The user's subscription tier
+
+        Raises:
+            RateLimitExceeded: If the user has reached their daily DM question limit
+            RedisServiceError: If Redis operation fails
+        """
+        limit = self.get_dm_question_limit_for_tier(user_tier)
+
+        # -1 means unlimited
+        if limit == -1:
+            logger.debug(
+                "DM question limit check passed (unlimited)",
+                user_id=user_id,
+                user_tier=user_tier.value
+            )
+            return
+
+        current_usage = self.get_current_dm_usage(user_id)
+
+        if current_usage >= limit:
+            reset_time = self._get_reset_time()
+
+            logger.warning(
+                "DM question limit exceeded",
+                user_id=user_id,
+                user_tier=user_tier.value,
+                current_usage=current_usage,
+                limit=limit,
+                reset_time=reset_time.isoformat()
+            )
+
+            raise RateLimitExceeded(
+                user_id=user_id,
+                user_tier=user_tier,
+                limit=limit,
+                current_usage=current_usage,
+                reset_time=reset_time
+            )
+
+        logger.debug(
+            "DM question limit check passed",
+            user_id=user_id,
+            user_tier=user_tier.value,
+            current_usage=current_usage,
+            limit=limit
+        )
+
+    def increment_dm_usage(self, user_id: str) -> int:
+        """
+        Increment the daily DM question counter for a user.
+
+        Args:
+            user_id: The user ID to increment
+
+        Returns:
+            The new DM question usage count after incrementing
+
+        Raises:
+            RedisServiceError: If Redis operation fails
+        """
+        key = self._get_dm_question_key(user_id)
+
+        # Increment the counter
+        new_count = self.redis.incr(key)
+
+        # Set expiration if this is the first increment
+        if new_count == 1:
+            ttl = self._get_seconds_until_midnight_utc()
+            self.redis.expire(key, ttl)
+
+            logger.debug(
+                "Set expiration on new DM question key",
+                user_id=user_id,
+                ttl=ttl
+            )
+
+        logger.info(
+            "Incremented DM question counter",
+            user_id=user_id,
+            new_count=new_count
+        )
+
+        return new_count
+
+    def get_remaining_dm_questions(self, user_id: str, user_tier: UserTier) -> int:
+        """
+        Get the number of remaining DM questions for a user today.
+
+        Args:
+            user_id: The user ID to check
+            user_tier: The user's subscription tier
+
+        Returns:
+            Number of DM questions remaining (-1 if unlimited, 0 if limit reached)
+        """
+        limit = self.get_dm_question_limit_for_tier(user_tier)
+
+        # -1 means unlimited
+        if limit == -1:
+            return -1
+
+        current_usage = self.get_current_dm_usage(user_id)
+        remaining = max(0, limit - current_usage)
+
+        logger.debug(
+            "Calculated remaining DM questions",
+            user_id=user_id,
+            user_tier=user_tier.value,
+            current_usage=current_usage,
+            limit=limit,
+            remaining=remaining
+        )
+
+        return remaining
+
+    def reset_dm_usage(self, user_id: str) -> bool:
+        """
+        Reset the daily DM question counter for a user.
+
+        This is primarily for admin/testing purposes.
+
+        Args:
+            user_id: The user ID to reset
+
+        Returns:
+            True if the counter was deleted, False if it didn't exist
+
+        Raises:
+            RedisServiceError: If Redis operation fails
+        """
+        key = self._get_dm_question_key(user_id)
+        deleted = self.redis.delete(key)
+
+        logger.info(
+            "Reset DM question counter",
+            user_id=user_id,
+            deleted=deleted > 0
+        )
+
+        return deleted > 0

api/app/services/redis_service.py

@@ -0,0 +1,505 @@
+"""
+Redis Service Wrapper
+
+This module provides a wrapper around the redis-py client for handling caching,
+job queue data, and temporary storage. It provides connection pooling, automatic
+reconnection, and a clean interface for common Redis operations.
+
+Usage:
+    from app.services.redis_service import RedisService
+
+    # Initialize service
+    redis = RedisService()
+
+    # Basic operations
+    redis.set("key", "value", ttl=3600)  # Set with 1 hour TTL
+    value = redis.get("key")
+    redis.delete("key")
+
+    # Health check
+    if redis.health_check():
+        print("Redis is healthy")
+"""
+
+import os
+import json
+from typing import Optional, Any, Union
+
+import redis
+from redis.exceptions import RedisError, ConnectionError as RedisConnectionError
+
+from app.utils.logging import get_logger
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+
+class RedisServiceError(Exception):
+    """Base exception for Redis service errors."""
+    pass
+
+
+class RedisConnectionFailed(RedisServiceError):
+    """Raised when Redis connection cannot be established."""
+    pass
+
+
+class RedisService:
+    """
+    Service class for interacting with Redis.
+
+    This class provides:
+    - Connection pooling for efficient connection management
+    - Basic operations: get, set, delete, exists
+    - TTL support for caching
+    - Health check for monitoring
+    - Automatic JSON serialization for complex objects
+
+    Attributes:
+        pool: Redis connection pool
+        client: Redis client instance
+    """
+
+    def __init__(self, redis_url: Optional[str] = None):
+        """
+        Initialize the Redis service.
+
+        Reads configuration from environment variables if not provided:
+        - REDIS_URL: Full Redis URL (e.g., redis://localhost:6379/0)
+
+        Args:
+            redis_url: Optional Redis URL to override environment variable
+
+        Raises:
+            RedisConnectionFailed: If connection to Redis fails
+        """
+        self.redis_url = redis_url or os.getenv('REDIS_URL', 'redis://localhost:6379/0')
+
+        if not self.redis_url:
+            logger.error("Missing Redis URL configuration")
+            raise ValueError("Redis URL not configured. Set REDIS_URL environment variable.")
+
+        try:
+            # Create connection pool for efficient connection management
+            # Connection pooling allows multiple operations to share connections
+            # and automatically manages connection lifecycle
+            self.pool = redis.ConnectionPool.from_url(
+                self.redis_url,
+                max_connections=10,
+                decode_responses=True,  # Return strings instead of bytes
+                socket_connect_timeout=5,  # Connection timeout in seconds
+                socket_timeout=5,  # Operation timeout in seconds
+                retry_on_timeout=True,  # Retry on timeout
+            )
+
+            # Create client using the connection pool
+            self.client = redis.Redis(connection_pool=self.pool)
+
+            # Test connection
+            self.client.ping()
+
+            logger.info("Redis service initialized", redis_url=self._sanitize_url(self.redis_url))
+
+        except RedisConnectionError as e:
+            logger.error("Failed to connect to Redis", redis_url=self._sanitize_url(self.redis_url), error=str(e))
+            raise RedisConnectionFailed(f"Could not connect to Redis at {self._sanitize_url(self.redis_url)}: {e}")
+        except RedisError as e:
+            logger.error("Redis initialization error", error=str(e))
+            raise RedisServiceError(f"Redis initialization failed: {e}")
+
+    def get(self, key: str) -> Optional[str]:
+        """
+        Get a value from Redis by key.
+
+        Args:
+            key: The key to retrieve
+
+        Returns:
+            The value as string if found, None if key doesn't exist
+
+        Raises:
+            RedisServiceError: If the operation fails
+        """
+        try:
+            value = self.client.get(key)
+
+            if value is not None:
+                logger.debug("Redis GET", key=key, found=True)
+            else:
+                logger.debug("Redis GET", key=key, found=False)
+
+            return value
+
+        except RedisError as e:
+            logger.error("Redis GET failed", key=key, error=str(e))
+            raise RedisServiceError(f"Failed to get key '{key}': {e}")
+
+    def get_json(self, key: str) -> Optional[Any]:
+        """
+        Get a value from Redis and deserialize it from JSON.
+
+        Args:
+            key: The key to retrieve
+
+        Returns:
+            The deserialized value if found, None if key doesn't exist
+
+        Raises:
+            RedisServiceError: If the operation fails or JSON is invalid
+        """
+        value = self.get(key)
+
+        if value is None:
+            return None
+
+        try:
+            return json.loads(value)
+        except json.JSONDecodeError as e:
+            logger.error("Failed to decode JSON from Redis", key=key, error=str(e))
+            raise RedisServiceError(f"Failed to decode JSON for key '{key}': {e}")
+
+    def set(
+        self,
+        key: str,
+        value: str,
+        ttl: Optional[int] = None,
+        nx: bool = False,
+        xx: bool = False
+    ) -> bool:
+        """
+        Set a value in Redis.
+
+        Args:
+            key: The key to set
+            value: The value to store (must be string)
+            ttl: Time to live in seconds (None for no expiration)
+            nx: Only set if key does not exist (for locking)
+            xx: Only set if key already exists
+
+        Returns:
+            True if the key was set, False if not set (due to nx/xx conditions)
+
+        Raises:
+            RedisServiceError: If the operation fails
+        """
+        try:
+            result = self.client.set(
+                key,
+                value,
+                ex=ttl,  # Expiration in seconds
+                nx=nx,   # Only set if not exists
+                xx=xx    # Only set if exists
+            )
+
+            # set() returns True if set, None if not set due to nx/xx
+            success = result is True or result == 1
+
+            logger.debug("Redis SET", key=key, ttl=ttl, nx=nx, xx=xx, success=success)
+
+            return success
+
+        except RedisError as e:
+            logger.error("Redis SET failed", key=key, error=str(e))
+            raise RedisServiceError(f"Failed to set key '{key}': {e}")
+
+    def set_json(
+        self,
+        key: str,
+        value: Any,
+        ttl: Optional[int] = None,
+        nx: bool = False,
+        xx: bool = False
+    ) -> bool:
+        """
+        Serialize a value to JSON and store it in Redis.
+
+        Args:
+            key: The key to set
+            value: The value to serialize and store (must be JSON-serializable)
+            ttl: Time to live in seconds (None for no expiration)
+            nx: Only set if key does not exist
+            xx: Only set if key already exists
+
+        Returns:
+            True if the key was set, False if not set (due to nx/xx conditions)
+
+        Raises:
+            RedisServiceError: If the operation fails or value is not JSON-serializable
+        """
+        try:
+            json_value = json.dumps(value)
+        except (TypeError, ValueError) as e:
+            logger.error("Failed to serialize value to JSON", key=key, error=str(e))
+            raise RedisServiceError(f"Failed to serialize value for key '{key}': {e}")
+
+        return self.set(key, json_value, ttl=ttl, nx=nx, xx=xx)
+
+    def delete(self, *keys: str) -> int:
+        """
+        Delete one or more keys from Redis.
+
+        Args:
+            *keys: One or more keys to delete
+
+        Returns:
+            The number of keys that were deleted
+
+        Raises:
+            RedisServiceError: If the operation fails
+        """
+        if not keys:
+            return 0
+
+        try:
+            deleted_count = self.client.delete(*keys)
+
+            logger.debug("Redis DELETE", keys=keys, deleted_count=deleted_count)
+
+            return deleted_count
+
+        except RedisError as e:
+            logger.error("Redis DELETE failed", keys=keys, error=str(e))
+            raise RedisServiceError(f"Failed to delete keys {keys}: {e}")
+
+    def exists(self, *keys: str) -> int:
+        """
+        Check if one or more keys exist in Redis.
+
+        Args:
+            *keys: One or more keys to check
+
+        Returns:
+            The number of keys that exist
+
+        Raises:
+            RedisServiceError: If the operation fails
+        """
+        if not keys:
+            return 0
+
+        try:
+            exists_count = self.client.exists(*keys)
+
+            logger.debug("Redis EXISTS", keys=keys, exists_count=exists_count)
+
+            return exists_count
+
+        except RedisError as e:
+            logger.error("Redis EXISTS failed", keys=keys, error=str(e))
+            raise RedisServiceError(f"Failed to check existence of keys {keys}: {e}")
+
+    def expire(self, key: str, ttl: int) -> bool:
+        """
+        Set a TTL (time to live) on an existing key.
+
+        Args:
+            key: The key to set expiration on
+            ttl: Time to live in seconds
+
+        Returns:
+            True if the timeout was set, False if key doesn't exist
+
+        Raises:
+            RedisServiceError: If the operation fails
+        """
+        try:
+            result = self.client.expire(key, ttl)
+
+            logger.debug("Redis EXPIRE", key=key, ttl=ttl, success=result)
+
+            return result
+
+        except RedisError as e:
+            logger.error("Redis EXPIRE failed", key=key, ttl=ttl, error=str(e))
+            raise RedisServiceError(f"Failed to set expiration for key '{key}': {e}")
+
+    def ttl(self, key: str) -> int:
+        """
+        Get the remaining TTL (time to live) for a key.
+
+        Args:
+            key: The key to check
+
+        Returns:
+            TTL in seconds, -1 if key exists but has no expiry, -2 if key doesn't exist
+
+        Raises:
+            RedisServiceError: If the operation fails
+        """
+        try:
+            remaining = self.client.ttl(key)
+
+            logger.debug("Redis TTL", key=key, remaining=remaining)
+
+            return remaining
+
+        except RedisError as e:
+            logger.error("Redis TTL failed", key=key, error=str(e))
+            raise RedisServiceError(f"Failed to get TTL for key '{key}': {e}")
+
+    def incr(self, key: str, amount: int = 1) -> int:
+        """
+        Increment a key's value by the given amount.
+
+        If the key doesn't exist, it will be created with the increment value.
+
+        Args:
+            key: The key to increment
+            amount: Amount to increment by (default 1)
+
+        Returns:
+            The new value after incrementing
+
+        Raises:
+            RedisServiceError: If the operation fails or value is not an integer
+        """
+        try:
+            new_value = self.client.incrby(key, amount)
+
+            logger.debug("Redis INCR", key=key, amount=amount, new_value=new_value)
+
+            return new_value
+
+        except RedisError as e:
+            logger.error("Redis INCR failed", key=key, amount=amount, error=str(e))
+            raise RedisServiceError(f"Failed to increment key '{key}': {e}")
+
+    def decr(self, key: str, amount: int = 1) -> int:
+        """
+        Decrement a key's value by the given amount.
+
+        If the key doesn't exist, it will be created with the negative increment value.
+
+        Args:
+            key: The key to decrement
+            amount: Amount to decrement by (default 1)
+
+        Returns:
+            The new value after decrementing
+
+        Raises:
+            RedisServiceError: If the operation fails or value is not an integer
+        """
+        try:
+            new_value = self.client.decrby(key, amount)
+
+            logger.debug("Redis DECR", key=key, amount=amount, new_value=new_value)
+
+            return new_value
+
+        except RedisError as e:
+            logger.error("Redis DECR failed", key=key, amount=amount, error=str(e))
+            raise RedisServiceError(f"Failed to decrement key '{key}': {e}")
+
+    def health_check(self) -> bool:
+        """
+        Check if Redis connection is healthy.
+
+        This performs a PING command to verify the connection is working.
+
+        Returns:
+            True if Redis is healthy and responding, False otherwise
+        """
+        try:
+            response = self.client.ping()
+
+            if response:
+                logger.debug("Redis health check passed")
+                return True
+            else:
+                logger.warning("Redis health check failed - unexpected response", response=response)
+                return False
+
+        except RedisError as e:
+            logger.error("Redis health check failed", error=str(e))
+            return False
+
+    def info(self) -> dict:
+        """
+        Get Redis server information.
+
+        Returns:
+            Dictionary containing server info (version, memory, clients, etc.)
+
+        Raises:
+            RedisServiceError: If the operation fails
+        """
+        try:
+            info = self.client.info()
+
+            logger.debug("Redis INFO retrieved", redis_version=info.get('redis_version'))
+
+            return info
+
+        except RedisError as e:
+            logger.error("Redis INFO failed", error=str(e))
+            raise RedisServiceError(f"Failed to get Redis info: {e}")
+
+    def flush_db(self) -> bool:
+        """
+        Delete all keys in the current database.
+
+        WARNING: This is a destructive operation. Use with caution.
+
+        Returns:
+            True if successful
+
+        Raises:
+            RedisServiceError: If the operation fails
+        """
+        try:
+            self.client.flushdb()
+
+            logger.warning("Redis database flushed")
+
+            return True
+
+        except RedisError as e:
+            logger.error("Redis FLUSHDB failed", error=str(e))
+            raise RedisServiceError(f"Failed to flush database: {e}")
+
+    def close(self) -> None:
+        """
+        Close all connections in the pool.
+
+        Call this when shutting down the application to cleanly release connections.
+        """
+        try:
+            self.pool.disconnect()
+            logger.info("Redis connection pool closed")
+        except Exception as e:
+            logger.error("Error closing Redis connection pool", error=str(e))
+
+    def _sanitize_url(self, url: str) -> str:
+        """
+        Remove password from Redis URL for safe logging.
+
+        Args:
+            url: Redis URL that may contain password
+
+        Returns:
+            URL with password masked
+        """
+        # Simple sanitization - mask password if present
+        # Format: redis://user:password@host:port/db
+        if '@' in url:
+            # Split on @ and mask everything before it except the protocol
+            parts = url.split('@')
+            protocol_and_creds = parts[0]
+            host_and_rest = parts[1]
+
+            if '://' in protocol_and_creds:
+                protocol = protocol_and_creds.split('://')[0]
+                return f"{protocol}://***@{host_and_rest}"
+
+        return url
+
+    def __enter__(self):
+        """Context manager entry."""
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        """Context manager exit - close connections."""
+        self.close()
+        return False

api/app/services/session_service.py

@@ -0,0 +1,705 @@
+"""
+Session Service - CRUD operations for game sessions.
+
+This service handles creating, reading, updating, and managing game sessions,
+with support for both solo and multiplayer sessions.
+"""
+
+import json
+from typing import List, Optional
+from datetime import datetime, timezone
+
+from appwrite.query import Query
+from appwrite.id import ID
+
+from app.models.session import GameSession, GameState, ConversationEntry, SessionConfig
+from app.models.enums import SessionStatus, SessionType
+from app.models.action_prompt import LocationType
+from app.services.database_service import get_database_service
+from app.services.appwrite_service import AppwriteService
+from app.services.character_service import get_character_service, CharacterNotFound
+from app.services.location_loader import get_location_loader
+from app.utils.logging import get_logger
+
+logger = get_logger(__file__)
+
+
+# Session limits per user
+MAX_ACTIVE_SESSIONS = 5
+
+
+class SessionNotFound(Exception):
+    """Raised when session ID doesn't exist or user doesn't own it."""
+    pass
+
+
+class SessionLimitExceeded(Exception):
+    """Raised when user tries to create more sessions than allowed."""
+    pass
+
+
+class SessionValidationError(Exception):
+    """Raised when session validation fails."""
+    pass
+
+
+class SessionService:
+    """
+    Service for managing game sessions.
+
+    This service provides:
+    - Session creation (solo and multiplayer)
+    - Session retrieval and listing
+    - Session state updates
+    - Conversation history management
+    - Game state tracking
+    """
+
+    def __init__(self):
+        """Initialize the session service with dependencies."""
+        self.db = get_database_service()
+        self.appwrite = AppwriteService()
+        self.character_service = get_character_service()
+        self.collection_id = "game_sessions"
+
+        logger.info("SessionService initialized")
+
+    def create_solo_session(
+        self,
+        user_id: str,
+        character_id: str,
+        starting_location: Optional[str] = None,
+        starting_location_type: Optional[LocationType] = None
+    ) -> GameSession:
+        """
+        Create a new solo game session.
+
+        This method:
+        1. Validates user owns the character
+        2. Validates user hasn't exceeded session limit
+        3. Determines starting location from location data
+        4. Creates session with initial game state
+        5. Stores in Appwrite database
+
+        Args:
+            user_id: Owner's user ID
+            character_id: Character ID for this session
+            starting_location: Initial location ID (optional, uses default starting location)
+            starting_location_type: Initial location type (optional, derived from location data)
+
+        Returns:
+            Created GameSession instance
+
+        Raises:
+            CharacterNotFound: If character doesn't exist or user doesn't own it
+            SessionLimitExceeded: If user has reached active session limit
+        """
+        try:
+            logger.info("Creating solo session",
+                       user_id=user_id,
+                       character_id=character_id)
+
+            # Validate user owns the character
+            character = self.character_service.get_character(character_id, user_id)
+            if not character:
+                raise CharacterNotFound(f"Character not found: {character_id}")
+
+            # Determine starting location from location data if not provided
+            if not starting_location:
+                location_loader = get_location_loader()
+                starting_locations = location_loader.get_starting_locations()
+
+                if starting_locations:
+                    # Use first starting location (usually crossville_village)
+                    start_loc = starting_locations[0]
+                    starting_location = start_loc.location_id
+                    # Convert from enums.LocationType to action_prompt.LocationType via string value
+                    starting_location_type = LocationType(start_loc.location_type.value)
+                    logger.info("Using starting location from data",
+                               location_id=starting_location,
+                               location_type=starting_location_type.value)
+                else:
+                    # Fallback to crossville_village
+                    starting_location = "crossville_village"
+                    starting_location_type = LocationType.TOWN
+                    logger.warning("No starting locations found, using fallback",
+                                  location_id=starting_location)
+
+            # Ensure location type is set
+            if not starting_location_type:
+                starting_location_type = LocationType.TOWN
+
+            # Check session limit
+            active_count = self.count_user_sessions(user_id, active_only=True)
+            if active_count >= MAX_ACTIVE_SESSIONS:
+                logger.warning("Session limit exceeded",
+                             user_id=user_id,
+                             current=active_count,
+                             limit=MAX_ACTIVE_SESSIONS)
+                raise SessionLimitExceeded(
+                    f"Maximum active sessions reached ({active_count}/{MAX_ACTIVE_SESSIONS}). "
+                    f"Please end an existing session to start a new one."
+                )
+
+            # Generate unique session ID
+            session_id = ID.unique()
+
+            # Create game state with starting location
+            game_state = GameState(
+                current_location=starting_location,
+                location_type=starting_location_type,
+                discovered_locations=[starting_location],
+                active_quests=[],
+                world_events=[]
+            )
+
+            # Create session instance
+            session = GameSession(
+                session_id=session_id,
+                session_type=SessionType.SOLO,
+                solo_character_id=character_id,
+                user_id=user_id,
+                party_member_ids=[],
+                config=SessionConfig(),
+                game_state=game_state,
+                turn_order=[character_id],
+                current_turn=0,
+                turn_number=0,
+                status=SessionStatus.ACTIVE
+            )
+
+            # Serialize and store
+            session_dict = session.to_dict()
+            session_json = json.dumps(session_dict)
+
+            document_data = {
+                'userId': user_id,
+                'characterId': character_id,
+                'sessionData': session_json,
+                'status': SessionStatus.ACTIVE.value,
+                'sessionType': SessionType.SOLO.value
+            }
+
+            self.db.create_document(
+                collection_id=self.collection_id,
+                data=document_data,
+                document_id=session_id
+            )
+
+            logger.info("Solo session created successfully",
+                       session_id=session_id,
+                       user_id=user_id,
+                       character_id=character_id)
+
+            return session
+
+        except (CharacterNotFound, SessionLimitExceeded):
+            raise
+        except Exception as e:
+            logger.error("Failed to create solo session",
+                        user_id=user_id,
+                        character_id=character_id,
+                        error=str(e))
+            raise
+
+    def get_session(self, session_id: str, user_id: Optional[str] = None) -> GameSession:
+        """
+        Get a session by ID.
+
+        Args:
+            session_id: Session ID
+            user_id: Optional user ID for ownership validation
+
+        Returns:
+            GameSession instance
+
+        Raises:
+            SessionNotFound: If session doesn't exist or user doesn't own it
+        """
+        try:
+            logger.debug("Fetching session", session_id=session_id)
+
+            # Get document from database
+            document = self.db.get_row(self.collection_id, session_id)
+
+            if not document:
+                logger.warning("Session not found", session_id=session_id)
+                raise SessionNotFound(f"Session not found: {session_id}")
+
+            # Verify ownership if user_id provided
+            if user_id and document.data.get('userId') != user_id:
+                logger.warning("Session ownership mismatch",
+                             session_id=session_id,
+                             expected_user=user_id,
+                             actual_user=document.data.get('userId'))
+                raise SessionNotFound(f"Session not found: {session_id}")
+
+            # Parse session data
+            session_json = document.data.get('sessionData')
+            session_dict = json.loads(session_json)
+            session = GameSession.from_dict(session_dict)
+
+            logger.debug("Session fetched successfully", session_id=session_id)
+            return session
+
+        except SessionNotFound:
+            raise
+        except Exception as e:
+            logger.error("Failed to fetch session",
+                        session_id=session_id,
+                        error=str(e))
+            raise
+
+    def update_session(self, session: GameSession) -> GameSession:
+        """
+        Update a session in the database.
+
+        Args:
+            session: GameSession instance with updated data
+
+        Returns:
+            Updated GameSession instance
+        """
+        try:
+            logger.debug("Updating session", session_id=session.session_id)
+
+            # Serialize session
+            session_dict = session.to_dict()
+            session_json = json.dumps(session_dict)
+
+            # Update in database
+            self.db.update_document(
+                collection_id=self.collection_id,
+                document_id=session.session_id,
+                data={
+                    'sessionData': session_json,
+                    'status': session.status.value
+                }
+            )
+
+            logger.debug("Session updated successfully", session_id=session.session_id)
+            return session
+
+        except Exception as e:
+            logger.error("Failed to update session",
+                        session_id=session.session_id,
+                        error=str(e))
+            raise
+
+    def get_user_sessions(
+        self,
+        user_id: str,
+        active_only: bool = True,
+        limit: int = 25
+    ) -> List[GameSession]:
+        """
+        Get all sessions for a user.
+
+        Args:
+            user_id: User ID
+            active_only: If True, only return active sessions
+            limit: Maximum number of sessions to return
+
+        Returns:
+            List of GameSession instances
+        """
+        try:
+            logger.debug("Fetching user sessions",
+                        user_id=user_id,
+                        active_only=active_only)
+
+            # Build query
+            queries = [Query.equal('userId', user_id)]
+            if active_only:
+                queries.append(Query.equal('status', SessionStatus.ACTIVE.value))
+
+            documents = self.db.list_rows(
+                table_id=self.collection_id,
+                queries=queries,
+                limit=limit
+            )
+
+            # Parse all sessions
+            sessions = []
+            for document in documents:
+                try:
+                    session_json = document.data.get('sessionData')
+                    session_dict = json.loads(session_json)
+                    session = GameSession.from_dict(session_dict)
+                    sessions.append(session)
+                except Exception as e:
+                    logger.error("Failed to parse session",
+                               document_id=document.id,
+                               error=str(e))
+                    continue
+
+            logger.debug("User sessions fetched",
+                        user_id=user_id,
+                        count=len(sessions))
+
+            return sessions
+
+        except Exception as e:
+            logger.error("Failed to fetch user sessions",
+                        user_id=user_id,
+                        error=str(e))
+            raise
+
+    def count_user_sessions(self, user_id: str, active_only: bool = True) -> int:
+        """
+        Count sessions for a user.
+
+        Args:
+            user_id: User ID
+            active_only: If True, only count active sessions
+
+        Returns:
+            Number of sessions
+        """
+        try:
+            queries = [Query.equal('userId', user_id)]
+            if active_only:
+                queries.append(Query.equal('status', SessionStatus.ACTIVE.value))
+
+            count = self.db.count_documents(
+                collection_id=self.collection_id,
+                queries=queries
+            )
+
+            logger.debug("Session count",
+                        user_id=user_id,
+                        active_only=active_only,
+                        count=count)
+            return count
+
+        except Exception as e:
+            logger.error("Failed to count sessions",
+                        user_id=user_id,
+                        error=str(e))
+            return 0
+
+    def end_session(self, session_id: str, user_id: str) -> GameSession:
+        """
+        End a session by marking it as completed.
+
+        Args:
+            session_id: Session ID
+            user_id: User ID for ownership validation
+
+        Returns:
+            Updated GameSession instance
+
+        Raises:
+            SessionNotFound: If session doesn't exist or user doesn't own it
+        """
+        try:
+            logger.info("Ending session", session_id=session_id, user_id=user_id)
+
+            session = self.get_session(session_id, user_id)
+            session.status = SessionStatus.COMPLETED
+            session.update_activity()
+
+            return self.update_session(session)
+
+        except SessionNotFound:
+            raise
+        except Exception as e:
+            logger.error("Failed to end session",
+                        session_id=session_id,
+                        error=str(e))
+            raise
+
+    def add_conversation_entry(
+        self,
+        session_id: str,
+        character_id: str,
+        character_name: str,
+        action: str,
+        dm_response: str,
+        combat_log: Optional[List] = None,
+        quest_offered: Optional[dict] = None
+    ) -> GameSession:
+        """
+        Add an entry to the conversation history.
+
+        This method automatically:
+        - Increments turn number
+        - Adds timestamp
+        - Updates last activity
+
+        Args:
+            session_id: Session ID
+            character_id: Acting character's ID
+            character_name: Acting character's name
+            action: Player's action text
+            dm_response: AI DM's response
+            combat_log: Optional combat actions
+            quest_offered: Optional quest offering info
+
+        Returns:
+            Updated GameSession instance
+        """
+        try:
+            logger.debug("Adding conversation entry",
+                        session_id=session_id,
+                        character_id=character_id)
+
+            session = self.get_session(session_id)
+
+            # Create conversation entry
+            entry = ConversationEntry(
+                turn=session.turn_number + 1,
+                character_id=character_id,
+                character_name=character_name,
+                action=action,
+                dm_response=dm_response,
+                combat_log=combat_log or [],
+                quest_offered=quest_offered
+            )
+
+            # Add entry and increment turn
+            session.conversation_history.append(entry)
+            session.turn_number += 1
+            session.update_activity()
+
+            # Save to database
+            return self.update_session(session)
+
+        except Exception as e:
+            logger.error("Failed to add conversation entry",
+                        session_id=session_id,
+                        error=str(e))
+            raise
+
+    def get_conversation_history(
+        self,
+        session_id: str,
+        limit: Optional[int] = None,
+        offset: int = 0
+    ) -> List[ConversationEntry]:
+        """
+        Get conversation history for a session.
+
+        Args:
+            session_id: Session ID
+            limit: Maximum entries to return (None for all)
+            offset: Number of entries to skip from end
+
+        Returns:
+            List of ConversationEntry instances
+        """
+        try:
+            session = self.get_session(session_id)
+            history = session.conversation_history
+
+            # Apply offset (from end)
+            if offset > 0:
+                history = history[:-offset] if offset < len(history) else []
+
+            # Apply limit (from end)
+            if limit and len(history) > limit:
+                history = history[-limit:]
+
+            return history
+
+        except Exception as e:
+            logger.error("Failed to get conversation history",
+                        session_id=session_id,
+                        error=str(e))
+            raise
+
+    def get_recent_history(self, session_id: str, num_turns: int = 3) -> List[ConversationEntry]:
+        """
+        Get the most recent conversation entries for AI context.
+
+        Args:
+            session_id: Session ID
+            num_turns: Number of recent turns to return
+
+        Returns:
+            List of most recent ConversationEntry instances
+        """
+        return self.get_conversation_history(session_id, limit=num_turns)
+
+    def update_location(
+        self,
+        session_id: str,
+        new_location: str,
+        location_type: LocationType
+    ) -> GameSession:
+        """
+        Update the current location in the session.
+
+        Also adds location to discovered_locations if not already there.
+
+        Args:
+            session_id: Session ID
+            new_location: New location name
+            location_type: New location type
+
+        Returns:
+            Updated GameSession instance
+        """
+        try:
+            logger.debug("Updating location",
+                        session_id=session_id,
+                        new_location=new_location)
+
+            session = self.get_session(session_id)
+            session.game_state.current_location = new_location
+            session.game_state.location_type = location_type
+
+            # Track discovered locations
+            if new_location not in session.game_state.discovered_locations:
+                session.game_state.discovered_locations.append(new_location)
+
+            session.update_activity()
+            return self.update_session(session)
+
+        except Exception as e:
+            logger.error("Failed to update location",
+                        session_id=session_id,
+                        error=str(e))
+            raise
+
+    def add_discovered_location(self, session_id: str, location: str) -> GameSession:
+        """
+        Add a location to the discovered locations list.
+
+        Args:
+            session_id: Session ID
+            location: Location name to add
+
+        Returns:
+            Updated GameSession instance
+        """
+        try:
+            session = self.get_session(session_id)
+
+            if location not in session.game_state.discovered_locations:
+                session.game_state.discovered_locations.append(location)
+                session.update_activity()
+                return self.update_session(session)
+
+            return session
+
+        except Exception as e:
+            logger.error("Failed to add discovered location",
+                        session_id=session_id,
+                        error=str(e))
+            raise
+
+    def add_active_quest(self, session_id: str, quest_id: str) -> GameSession:
+        """
+        Add a quest to the active quests list.
+
+        Validates max 2 active quests limit.
+
+        Args:
+            session_id: Session ID
+            quest_id: Quest ID to add
+
+        Returns:
+            Updated GameSession instance
+
+        Raises:
+            SessionValidationError: If max quests limit exceeded
+        """
+        try:
+            session = self.get_session(session_id)
+
+            # Check max active quests (2)
+            if len(session.game_state.active_quests) >= 2:
+                raise SessionValidationError(
+                    "Maximum active quests reached (2/2). "
+                    "Complete or abandon a quest to accept a new one."
+                )
+
+            if quest_id not in session.game_state.active_quests:
+                session.game_state.active_quests.append(quest_id)
+                session.update_activity()
+                return self.update_session(session)
+
+            return session
+
+        except SessionValidationError:
+            raise
+        except Exception as e:
+            logger.error("Failed to add active quest",
+                        session_id=session_id,
+                        quest_id=quest_id,
+                        error=str(e))
+            raise
+
+    def remove_active_quest(self, session_id: str, quest_id: str) -> GameSession:
+        """
+        Remove a quest from the active quests list.
+
+        Args:
+            session_id: Session ID
+            quest_id: Quest ID to remove
+
+        Returns:
+            Updated GameSession instance
+        """
+        try:
+            session = self.get_session(session_id)
+
+            if quest_id in session.game_state.active_quests:
+                session.game_state.active_quests.remove(quest_id)
+                session.update_activity()
+                return self.update_session(session)
+
+            return session
+
+        except Exception as e:
+            logger.error("Failed to remove active quest",
+                        session_id=session_id,
+                        quest_id=quest_id,
+                        error=str(e))
+            raise
+
+    def add_world_event(self, session_id: str, event: dict) -> GameSession:
+        """
+        Add a world event to the session.
+
+        Args:
+            session_id: Session ID
+            event: Event dictionary with type, description, etc.
+
+        Returns:
+            Updated GameSession instance
+        """
+        try:
+            session = self.get_session(session_id)
+
+            # Add timestamp if not present
+            if 'timestamp' not in event:
+                event['timestamp'] = datetime.now(timezone.utc).isoformat().replace("+00:00", "Z")
+
+            session.game_state.world_events.append(event)
+            session.update_activity()
+            return self.update_session(session)
+
+        except Exception as e:
+            logger.error("Failed to add world event",
+                        session_id=session_id,
+                        error=str(e))
+            raise
+
+
+# Global instance for convenience
+_service_instance: Optional[SessionService] = None
+
+
+def get_session_service() -> SessionService:
+    """
+    Get the global SessionService instance.
+
+    Returns:
+        Singleton SessionService instance
+    """
+    global _service_instance
+    if _service_instance is None:
+        _service_instance = SessionService()
+    return _service_instance

api/app/services/usage_tracking_service.py

@@ -0,0 +1,528 @@
+"""
+Usage Tracking Service for AI cost and usage monitoring.
+
+This service tracks all AI usage events, calculates costs, and provides
+analytics for monitoring and rate limiting purposes.
+
+Usage:
+    from app.services.usage_tracking_service import UsageTrackingService
+
+    tracker = UsageTrackingService()
+
+    # Log a usage event
+    tracker.log_usage(
+        user_id="user_123",
+        model="anthropic/claude-3.5-sonnet",
+        tokens_input=100,
+        tokens_output=350,
+        task_type=TaskType.STORY_PROGRESSION
+    )
+
+    # Get daily usage
+    usage = tracker.get_daily_usage("user_123", date.today())
+    print(f"Total requests: {usage.total_requests}")
+    print(f"Estimated cost: ${usage.estimated_cost:.4f}")
+"""
+
+import os
+from datetime import datetime, timezone, date, timedelta
+from typing import Dict, Any, List, Optional
+from uuid import uuid4
+
+from appwrite.client import Client
+from appwrite.services.tables_db import TablesDB
+from appwrite.exception import AppwriteException
+from appwrite.id import ID
+from appwrite.query import Query
+
+from app.utils.logging import get_logger
+from app.models.ai_usage import (
+    AIUsageLog,
+    DailyUsageSummary,
+    MonthlyUsageSummary,
+    TaskType
+)
+
+logger = get_logger(__file__)
+
+
+# Cost per 1000 tokens by model (in USD)
+# These are estimates based on Replicate pricing
+MODEL_COSTS = {
+    # Llama models (via Replicate) - very cheap
+    "meta/meta-llama-3-8b-instruct": {
+        "input": 0.0001,   # $0.0001 per 1K input tokens
+        "output": 0.0001,  # $0.0001 per 1K output tokens
+    },
+    "meta/meta-llama-3-70b-instruct": {
+        "input": 0.0006,
+        "output": 0.0006,
+    },
+    # Claude models (via Replicate)
+    "anthropic/claude-3.5-haiku": {
+        "input": 0.001,    # $0.001 per 1K input tokens
+        "output": 0.005,   # $0.005 per 1K output tokens
+    },
+    "anthropic/claude-3-haiku": {
+        "input": 0.00025,
+        "output": 0.00125,
+    },
+    "anthropic/claude-3.5-sonnet": {
+        "input": 0.003,    # $0.003 per 1K input tokens
+        "output": 0.015,   # $0.015 per 1K output tokens
+    },
+    "anthropic/claude-4.5-sonnet": {
+        "input": 0.003,
+        "output": 0.015,
+    },
+    "anthropic/claude-3-opus": {
+        "input": 0.015,    # $0.015 per 1K input tokens
+        "output": 0.075,   # $0.075 per 1K output tokens
+    },
+}
+
+# Default cost for unknown models
+DEFAULT_COST = {"input": 0.001, "output": 0.005}
+
+
+class UsageTrackingService:
+    """
+    Service for tracking AI usage and calculating costs.
+
+    This service provides:
+    - Logging individual AI usage events to Appwrite
+    - Calculating estimated costs based on model pricing
+    - Retrieving daily and monthly usage summaries
+    - Analytics for monitoring and rate limiting
+
+    The service stores usage logs in an Appwrite collection named 'ai_usage_logs'.
+    """
+
+    # Collection ID for usage logs
+    COLLECTION_ID = "ai_usage_logs"
+
+    def __init__(self):
+        """
+        Initialize the usage tracking service.
+
+        Reads configuration from environment variables:
+        - APPWRITE_ENDPOINT: Appwrite API endpoint
+        - APPWRITE_PROJECT_ID: Appwrite project ID
+        - APPWRITE_API_KEY: Appwrite API key
+        - APPWRITE_DATABASE_ID: Appwrite database ID
+
+        Raises:
+            ValueError: If required environment variables are missing
+        """
+        self.endpoint = os.getenv('APPWRITE_ENDPOINT')
+        self.project_id = os.getenv('APPWRITE_PROJECT_ID')
+        self.api_key = os.getenv('APPWRITE_API_KEY')
+        self.database_id = os.getenv('APPWRITE_DATABASE_ID', 'main')
+
+        if not all([self.endpoint, self.project_id, self.api_key]):
+            logger.error("Missing Appwrite configuration in environment variables")
+            raise ValueError("Appwrite configuration incomplete. Check APPWRITE_* environment variables.")
+
+        # Initialize Appwrite client
+        self.client = Client()
+        self.client.set_endpoint(self.endpoint)
+        self.client.set_project(self.project_id)
+        self.client.set_key(self.api_key)
+
+        # Initialize TablesDB service
+        self.tables_db = TablesDB(self.client)
+
+        logger.info("UsageTrackingService initialized", database_id=self.database_id)
+
+    def log_usage(
+        self,
+        user_id: str,
+        model: str,
+        tokens_input: int,
+        tokens_output: int,
+        task_type: TaskType,
+        session_id: Optional[str] = None,
+        character_id: Optional[str] = None,
+        request_duration_ms: int = 0,
+        success: bool = True,
+        error_message: Optional[str] = None
+    ) -> AIUsageLog:
+        """
+        Log an AI usage event.
+
+        This method creates a new usage log entry in Appwrite with all
+        relevant information about the AI request including calculated
+        estimated cost.
+
+        Args:
+            user_id: User who made the request
+            model: Model identifier (e.g., "anthropic/claude-3.5-sonnet")
+            tokens_input: Number of input tokens (prompt)
+            tokens_output: Number of output tokens (response)
+            task_type: Type of task (story, combat, quest, npc)
+            session_id: Optional game session ID
+            character_id: Optional character ID
+            request_duration_ms: Request duration in milliseconds
+            success: Whether the request succeeded
+            error_message: Error message if failed
+
+        Returns:
+            AIUsageLog with the logged data
+
+        Raises:
+            AppwriteException: If storage fails
+        """
+        # Calculate total tokens
+        tokens_total = tokens_input + tokens_output
+
+        # Calculate estimated cost
+        estimated_cost = self._calculate_cost(model, tokens_input, tokens_output)
+
+        # Generate log ID
+        log_id = str(uuid4())
+
+        # Create usage log
+        usage_log = AIUsageLog(
+            log_id=log_id,
+            user_id=user_id,
+            timestamp=datetime.now(timezone.utc),
+            model=model,
+            tokens_input=tokens_input,
+            tokens_output=tokens_output,
+            tokens_total=tokens_total,
+            estimated_cost=estimated_cost,
+            task_type=task_type,
+            session_id=session_id,
+            character_id=character_id,
+            request_duration_ms=request_duration_ms,
+            success=success,
+            error_message=error_message,
+        )
+
+        try:
+            # Store in Appwrite
+            result = self.tables_db.create_row(
+                database_id=self.database_id,
+                table_id=self.COLLECTION_ID,
+                row_id=log_id,
+                data=usage_log.to_dict()
+            )
+
+            logger.info(
+                "AI usage logged",
+                log_id=log_id,
+                user_id=user_id,
+                model=model,
+                tokens_total=tokens_total,
+                estimated_cost=estimated_cost,
+                task_type=task_type.value,
+                success=success
+            )
+
+            return usage_log
+
+        except AppwriteException as e:
+            logger.error(
+                "Failed to log AI usage",
+                user_id=user_id,
+                model=model,
+                error=str(e),
+                code=e.code
+            )
+            raise
+
+    def get_daily_usage(self, user_id: str, target_date: date) -> DailyUsageSummary:
+        """
+        Get AI usage summary for a specific day.
+
+        Args:
+            user_id: User ID to get usage for
+            target_date: Date to get usage for
+
+        Returns:
+            DailyUsageSummary with aggregated usage data
+
+        Raises:
+            AppwriteException: If query fails
+        """
+        try:
+            # Build date range for the target day (UTC)
+            start_of_day = datetime.combine(target_date, datetime.min.time()).replace(tzinfo=timezone.utc)
+            end_of_day = datetime.combine(target_date, datetime.max.time()).replace(tzinfo=timezone.utc)
+
+            # Query usage logs for this user and date
+            result = self.tables_db.list_rows(
+                database_id=self.database_id,
+                table_id=self.COLLECTION_ID,
+                queries=[
+                    Query.equal("user_id", user_id),
+                    Query.greater_than_equal("timestamp", start_of_day.isoformat()),
+                    Query.less_than_equal("timestamp", end_of_day.isoformat()),
+                    Query.limit(1000)  # Cap at 1000 entries per day
+                ]
+            )
+
+            # Aggregate the data
+            total_requests = 0
+            total_tokens = 0
+            total_input_tokens = 0
+            total_output_tokens = 0
+            total_cost = 0.0
+            requests_by_task: Dict[str, int] = {}
+
+            for doc in result['rows']:
+                total_requests += 1
+                total_tokens += doc.get('tokens_total', 0)
+                total_input_tokens += doc.get('tokens_input', 0)
+                total_output_tokens += doc.get('tokens_output', 0)
+                total_cost += doc.get('estimated_cost', 0.0)
+
+                task_type = doc.get('task_type', 'general')
+                requests_by_task[task_type] = requests_by_task.get(task_type, 0) + 1
+
+            summary = DailyUsageSummary(
+                date=target_date,
+                user_id=user_id,
+                total_requests=total_requests,
+                total_tokens=total_tokens,
+                total_input_tokens=total_input_tokens,
+                total_output_tokens=total_output_tokens,
+                estimated_cost=total_cost,
+                requests_by_task=requests_by_task
+            )
+
+            logger.debug(
+                "Daily usage retrieved",
+                user_id=user_id,
+                date=target_date.isoformat(),
+                total_requests=total_requests,
+                estimated_cost=total_cost
+            )
+
+            return summary
+
+        except AppwriteException as e:
+            logger.error(
+                "Failed to get daily usage",
+                user_id=user_id,
+                date=target_date.isoformat(),
+                error=str(e),
+                code=e.code
+            )
+            raise
+
+    def get_monthly_cost(self, user_id: str, year: int, month: int) -> MonthlyUsageSummary:
+        """
+        Get AI usage cost summary for a specific month.
+
+        Args:
+            user_id: User ID to get cost for
+            year: Year (e.g., 2025)
+            month: Month (1-12)
+
+        Returns:
+            MonthlyUsageSummary with aggregated cost data
+
+        Raises:
+            AppwriteException: If query fails
+            ValueError: If month is invalid
+        """
+        if not 1 <= month <= 12:
+            raise ValueError(f"Invalid month: {month}. Must be 1-12.")
+
+        try:
+            # Build date range for the month
+            start_of_month = datetime(year, month, 1, 0, 0, 0, tzinfo=timezone.utc)
+
+            # Calculate end of month
+            if month == 12:
+                end_of_month = datetime(year + 1, 1, 1, 0, 0, 0, tzinfo=timezone.utc) - timedelta(seconds=1)
+            else:
+                end_of_month = datetime(year, month + 1, 1, 0, 0, 0, tzinfo=timezone.utc) - timedelta(seconds=1)
+
+            # Query usage logs for this user and month
+            result = self.tables_db.list_rows(
+                database_id=self.database_id,
+                table_id=self.COLLECTION_ID,
+                queries=[
+                    Query.equal("user_id", user_id),
+                    Query.greater_than_equal("timestamp", start_of_month.isoformat()),
+                    Query.less_than_equal("timestamp", end_of_month.isoformat()),
+                    Query.limit(5000)  # Cap at 5000 entries per month
+                ]
+            )
+
+            # Aggregate the data
+            total_requests = 0
+            total_tokens = 0
+            total_cost = 0.0
+
+            for doc in result['rows']:
+                total_requests += 1
+                total_tokens += doc.get('tokens_total', 0)
+                total_cost += doc.get('estimated_cost', 0.0)
+
+            summary = MonthlyUsageSummary(
+                year=year,
+                month=month,
+                user_id=user_id,
+                total_requests=total_requests,
+                total_tokens=total_tokens,
+                estimated_cost=total_cost
+            )
+
+            logger.debug(
+                "Monthly cost retrieved",
+                user_id=user_id,
+                year=year,
+                month=month,
+                total_requests=total_requests,
+                estimated_cost=total_cost
+            )
+
+            return summary
+
+        except AppwriteException as e:
+            logger.error(
+                "Failed to get monthly cost",
+                user_id=user_id,
+                year=year,
+                month=month,
+                error=str(e),
+                code=e.code
+            )
+            raise
+
+    def get_total_daily_cost(self, target_date: date) -> float:
+        """
+        Get the total AI cost across all users for a specific day.
+
+        Used for admin monitoring and alerting.
+
+        Args:
+            target_date: Date to get cost for
+
+        Returns:
+            Total estimated cost in USD
+
+        Raises:
+            AppwriteException: If query fails
+        """
+        try:
+            # Build date range for the target day
+            start_of_day = datetime.combine(target_date, datetime.min.time()).replace(tzinfo=timezone.utc)
+            end_of_day = datetime.combine(target_date, datetime.max.time()).replace(tzinfo=timezone.utc)
+
+            # Query all usage logs for this date
+            result = self.tables_db.list_rows(
+                database_id=self.database_id,
+                table_id=self.COLLECTION_ID,
+                queries=[
+                    Query.greater_than_equal("timestamp", start_of_day.isoformat()),
+                    Query.less_than_equal("timestamp", end_of_day.isoformat()),
+                    Query.limit(10000)
+                ]
+            )
+
+            # Sum up costs
+            total_cost = sum(doc.get('estimated_cost', 0.0) for doc in result['rows'])
+
+            logger.debug(
+                "Total daily cost retrieved",
+                date=target_date.isoformat(),
+                total_cost=total_cost,
+                total_documents=len(result['rows'])
+            )
+
+            return total_cost
+
+        except AppwriteException as e:
+            logger.error(
+                "Failed to get total daily cost",
+                date=target_date.isoformat(),
+                error=str(e),
+                code=e.code
+            )
+            raise
+
+    def get_user_request_count_today(self, user_id: str) -> int:
+        """
+        Get the number of AI requests a user has made today.
+
+        Used for rate limiting checks.
+
+        Args:
+            user_id: User ID to check
+
+        Returns:
+            Number of requests made today
+
+        Raises:
+            AppwriteException: If query fails
+        """
+        try:
+            summary = self.get_daily_usage(user_id, date.today())
+            return summary.total_requests
+
+        except AppwriteException:
+            # If there's an error, return 0 to be safe (fail open)
+            logger.warning(
+                "Failed to get user request count, returning 0",
+                user_id=user_id
+            )
+            return 0
+
+    def _calculate_cost(self, model: str, tokens_input: int, tokens_output: int) -> float:
+        """
+        Calculate the estimated cost for an AI request.
+
+        Args:
+            model: Model identifier
+            tokens_input: Number of input tokens
+            tokens_output: Number of output tokens
+
+        Returns:
+            Estimated cost in USD
+        """
+        # Get cost per 1K tokens for this model
+        model_cost = MODEL_COSTS.get(model, DEFAULT_COST)
+
+        # Calculate cost (costs are per 1K tokens)
+        input_cost = (tokens_input / 1000) * model_cost["input"]
+        output_cost = (tokens_output / 1000) * model_cost["output"]
+        total_cost = input_cost + output_cost
+
+        return round(total_cost, 6)  # Round to 6 decimal places
+
+    @staticmethod
+    def estimate_cost_for_model(model: str, tokens_input: int, tokens_output: int) -> float:
+        """
+        Static method to estimate cost without needing a service instance.
+
+        Useful for pre-calculation and UI display.
+
+        Args:
+            model: Model identifier
+            tokens_input: Number of input tokens
+            tokens_output: Number of output tokens
+
+        Returns:
+            Estimated cost in USD
+        """
+        model_cost = MODEL_COSTS.get(model, DEFAULT_COST)
+        input_cost = (tokens_input / 1000) * model_cost["input"]
+        output_cost = (tokens_output / 1000) * model_cost["output"]
+        return round(input_cost + output_cost, 6)
+
+    @staticmethod
+    def get_model_cost_info(model: str) -> Dict[str, float]:
+        """
+        Get cost information for a model.
+
+        Args:
+            model: Model identifier
+
+        Returns:
+            Dictionary with 'input' and 'output' cost per 1K tokens
+        """
+        return MODEL_COSTS.get(model, DEFAULT_COST)

api/app/tasks/__init__.py

@@ -0,0 +1,156 @@
+"""
+RQ Task Queue Configuration
+
+This module defines the job queues used for background task processing.
+All async operations (AI generation, combat processing, marketplace tasks)
+are processed through these queues.
+
+Queue Types:
+- ai_tasks: AI narrative generation (highest priority)
+- combat_tasks: Combat processing
+- marketplace_tasks: Auction cleanup and periodic tasks (lowest priority)
+
+Usage:
+    from app.tasks import get_queue, QUEUE_AI_TASKS
+
+    queue = get_queue(QUEUE_AI_TASKS)
+    job = queue.enqueue(my_function, arg1, arg2)
+"""
+
+import os
+from typing import Optional
+
+from redis import Redis
+from rq import Queue
+
+from app.utils.logging import get_logger
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+
+# Queue names
+QUEUE_AI_TASKS = 'ai_tasks'
+QUEUE_COMBAT_TASKS = 'combat_tasks'
+QUEUE_MARKETPLACE_TASKS = 'marketplace_tasks'
+
+# All queue names in priority order (highest first)
+ALL_QUEUES = [
+    QUEUE_AI_TASKS,
+    QUEUE_COMBAT_TASKS,
+    QUEUE_MARKETPLACE_TASKS,
+]
+
+# Queue configurations
+QUEUE_CONFIG = {
+    QUEUE_AI_TASKS: {
+        'default_timeout': 120,  # 2 minutes for AI generation
+        'default_result_ttl': 3600,  # Keep results for 1 hour
+        'default_failure_ttl': 86400,  # Keep failures for 24 hours
+        'description': 'AI narrative generation tasks',
+    },
+    QUEUE_COMBAT_TASKS: {
+        'default_timeout': 60,  # 1 minute for combat
+        'default_result_ttl': 3600,
+        'default_failure_ttl': 86400,
+        'description': 'Combat processing tasks',
+    },
+    QUEUE_MARKETPLACE_TASKS: {
+        'default_timeout': 300,  # 5 minutes for marketplace
+        'default_result_ttl': 3600,
+        'default_failure_ttl': 86400,
+        'description': 'Marketplace and auction tasks',
+    },
+}
+
+
+# Redis connection singleton
+_redis_connection: Optional[Redis] = None
+
+
+def get_redis_connection() -> Redis:
+    """
+    Get the Redis connection for RQ.
+
+    Uses a singleton pattern to reuse the connection.
+
+    Returns:
+        Redis connection instance
+    """
+    global _redis_connection
+
+    if _redis_connection is None:
+        redis_url = os.getenv('REDIS_URL', 'redis://localhost:6379/0')
+        _redis_connection = Redis.from_url(redis_url)
+        logger.info("RQ Redis connection established", redis_url=redis_url.split('@')[-1])
+
+    return _redis_connection
+
+
+def get_queue(queue_name: str) -> Queue:
+    """
+    Get an RQ queue by name.
+
+    Args:
+        queue_name: Name of the queue (use constants like QUEUE_AI_TASKS)
+
+    Returns:
+        RQ Queue instance
+
+    Raises:
+        ValueError: If queue name is not recognized
+    """
+    if queue_name not in QUEUE_CONFIG:
+        raise ValueError(f"Unknown queue: {queue_name}. Must be one of {list(QUEUE_CONFIG.keys())}")
+
+    config = QUEUE_CONFIG[queue_name]
+    conn = get_redis_connection()
+
+    return Queue(
+        name=queue_name,
+        connection=conn,
+        default_timeout=config['default_timeout'],
+    )
+
+
+def get_all_queues() -> list[Queue]:
+    """
+    Get all configured queues in priority order.
+
+    Returns:
+        List of Queue instances (highest priority first)
+    """
+    return [get_queue(name) for name in ALL_QUEUES]
+
+
+def get_queue_info(queue_name: str) -> dict:
+    """
+    Get information about a queue.
+
+    Args:
+        queue_name: Name of the queue
+
+    Returns:
+        Dictionary with queue statistics
+    """
+    queue = get_queue(queue_name)
+    config = QUEUE_CONFIG[queue_name]
+
+    return {
+        'name': queue_name,
+        'description': config['description'],
+        'count': len(queue),
+        'default_timeout': config['default_timeout'],
+        'default_result_ttl': config['default_result_ttl'],
+    }
+
+
+def get_all_queues_info() -> list[dict]:
+    """
+    Get information about all queues.
+
+    Returns:
+        List of queue info dictionaries
+    """
+    return [get_queue_info(name) for name in ALL_QUEUES]

api/app/utils/__init__.py

@@ -0,0 +1 @@
+"""Utility modules for Code of Conquest."""

api/app/utils/auth.py

@@ -0,0 +1,444 @@
+"""
+Authentication Utilities
+
+This module provides authentication middleware, decorators, and helper functions
+for protecting routes and managing user sessions.
+
+Usage:
+    from app.utils.auth import require_auth, require_tier, get_current_user
+
+    @app.route('/protected')
+    @require_auth
+    def protected_route():
+        user = get_current_user()
+        return f"Hello, {user.name}!"
+
+    @app.route('/premium-feature')
+    @require_auth
+    @require_tier('premium')
+    def premium_feature():
+        return "Premium content"
+"""
+
+from functools import wraps
+from typing import Optional, Callable
+from flask import request, g, jsonify, redirect, url_for
+
+from app.services.appwrite_service import AppwriteService, UserData
+from app.utils.response import unauthorized_response, forbidden_response
+from app.utils.logging import get_logger
+from app.config import get_config
+from appwrite.exception import AppwriteException
+
+
+# Initialize logger
+logger = get_logger(__file__)
+
+
+def extract_session_token() -> Optional[str]:
+    """
+    Extract the session token from the request cookie.
+
+    Returns:
+        Session token string if found, None otherwise
+    """
+    config = get_config()
+    cookie_name = config.auth.cookie_name
+
+    token = request.cookies.get(cookie_name)
+    return token
+
+
+def verify_session(token: str) -> Optional[UserData]:
+    """
+    Verify a session token and return the associated user data.
+
+    This function:
+    1. Validates the session token with Appwrite
+    2. Checks if the session is still active (not expired)
+    3. Retrieves and returns the user data
+
+    Args:
+        token: Session token from cookie
+
+    Returns:
+        UserData object if session is valid, None otherwise
+    """
+    try:
+        appwrite = AppwriteService()
+
+        # Validate session
+        session_data = appwrite.get_session(session_id=token)
+
+        # Get user data
+        user_data = appwrite.get_user(user_id=session_data.user_id)
+        return user_data
+
+    except AppwriteException as e:
+        logger.warning("Session verification failed", error=str(e), code=e.code)
+        return None
+    except Exception as e:
+        logger.error("Unexpected error during session verification", error=str(e))
+        return None
+
+
+def get_current_user() -> Optional[UserData]:
+    """
+    Get the current authenticated user from the request context.
+
+    This function retrieves the user object that was attached to the
+    request context by the @require_auth decorator.
+
+    Returns:
+        UserData object if user is authenticated, None otherwise
+
+    Usage:
+        @app.route('/profile')
+        @require_auth
+        def profile():
+            user = get_current_user()
+            return f"Welcome, {user.name}!"
+    """
+    return getattr(g, 'current_user', None)
+
+
+def require_auth(f: Callable) -> Callable:
+    """
+    Decorator to require authentication for a route (API endpoints).
+
+    This decorator:
+    1. Extracts the session token from the cookie
+    2. Verifies the session with Appwrite
+    3. Attaches the user object to the request context (g.current_user)
+    4. Allows the request to proceed if authenticated
+    5. Returns 401 Unauthorized JSON if not authenticated
+
+    For web views, use @require_auth_web instead.
+
+    Args:
+        f: The Flask route function to wrap
+
+    Returns:
+        Wrapped function with authentication check
+
+    Usage:
+        @app.route('/api/protected')
+        @require_auth
+        def protected_route():
+            user = get_current_user()
+            return f"Hello, {user.name}!"
+    """
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        # Extract session token from cookie
+        token = extract_session_token()
+
+        if not token:
+            logger.warning("Authentication required but no session token provided", path=request.path)
+            return unauthorized_response(message="Authentication required. Please log in.")
+
+        # Verify session and get user
+        user = verify_session(token)
+
+        if not user:
+            logger.warning("Invalid or expired session token", path=request.path)
+            return unauthorized_response(message="Session invalid or expired. Please log in again.")
+
+        # Attach user to request context
+        g.current_user = user
+
+        logger.debug("User authenticated", user_id=user.id, email=user.email, path=request.path)
+
+        # Call the original function
+        return f(*args, **kwargs)
+
+    return decorated_function
+
+
+def require_auth_web(f: Callable) -> Callable:
+    """
+    Decorator to require authentication for a web view route.
+
+    This decorator:
+    1. Extracts the session token from the cookie
+    2. Verifies the session with Appwrite
+    3. Attaches the user object to the request context (g.current_user)
+    4. Allows the request to proceed if authenticated
+    5. Redirects to login page if not authenticated
+
+    For API endpoints, use @require_auth instead.
+
+    Args:
+        f: The Flask route function to wrap
+
+    Returns:
+        Wrapped function with authentication check
+
+    Usage:
+        @app.route('/dashboard')
+        @require_auth_web
+        def dashboard():
+            user = get_current_user()
+            return render_template('dashboard.html', user=user)
+    """
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        # Extract session token from cookie
+        token = extract_session_token()
+
+        if not token:
+            logger.warning("Authentication required but no session token provided", path=request.path)
+            return redirect(url_for('auth_views.login'))
+
+        # Verify session and get user
+        user = verify_session(token)
+
+        if not user:
+            logger.warning("Invalid or expired session token", path=request.path)
+            return redirect(url_for('auth_views.login'))
+
+        # Attach user to request context
+        g.current_user = user
+
+        logger.debug("User authenticated", user_id=user.id, email=user.email, path=request.path)
+
+        # Call the original function
+        return f(*args, **kwargs)
+
+    return decorated_function
+
+
+def require_tier(minimum_tier: str) -> Callable:
+    """
+    Decorator to require a minimum subscription tier for a route.
+
+    This decorator must be used AFTER @require_auth.
+
+    Tier hierarchy (from lowest to highest):
+    - free
+    - basic
+    - premium
+    - elite
+
+    Args:
+        minimum_tier: Minimum required tier (free, basic, premium, elite)
+
+    Returns:
+        Decorator function
+
+    Raises:
+        ValueError: If minimum_tier is invalid
+
+    Usage:
+        @app.route('/premium-feature')
+        @require_auth
+        @require_tier('premium')
+        def premium_feature():
+            return "Premium content"
+    """
+    # Define tier hierarchy
+    tier_hierarchy = {
+        'free': 0,
+        'basic': 1,
+        'premium': 2,
+        'elite': 3
+    }
+
+    if minimum_tier not in tier_hierarchy:
+        raise ValueError(f"Invalid tier: {minimum_tier}. Must be one of {list(tier_hierarchy.keys())}")
+
+    def decorator(f: Callable) -> Callable:
+        @wraps(f)
+        def decorated_function(*args, **kwargs):
+            # Get current user (set by @require_auth)
+            user = get_current_user()
+
+            if not user:
+                logger.error("require_tier used without require_auth", path=request.path)
+                return unauthorized_response(message="Authentication required.")
+
+            # Get user's tier level
+            user_tier = user.tier
+            user_tier_level = tier_hierarchy.get(user_tier, 0)
+            required_tier_level = tier_hierarchy[minimum_tier]
+
+            # Check if user has sufficient tier
+            if user_tier_level < required_tier_level:
+                logger.warning(
+                    "Access denied - insufficient tier",
+                    user_id=user.id,
+                    user_tier=user_tier,
+                    required_tier=minimum_tier,
+                    path=request.path
+                )
+                return forbidden_response(
+                    message=f"This feature requires {minimum_tier.capitalize()} tier or higher. "
+                            f"Your current tier: {user_tier.capitalize()}."
+                )
+
+            logger.debug(
+                "Tier requirement met",
+                user_id=user.id,
+                user_tier=user_tier,
+                required_tier=minimum_tier,
+                path=request.path
+            )
+
+            # Call the original function
+            return f(*args, **kwargs)
+
+        return decorated_function
+
+    return decorator
+
+
+def require_email_verified(f: Callable) -> Callable:
+    """
+    Decorator to require email verification for a route.
+
+    This decorator must be used AFTER @require_auth.
+
+    Args:
+        f: The Flask route function to wrap
+
+    Returns:
+        Wrapped function with email verification check
+
+    Usage:
+        @app.route('/verified-only')
+        @require_auth
+        @require_email_verified
+        def verified_only():
+            return "You can only see this if your email is verified"
+    """
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        # Get current user (set by @require_auth)
+        user = get_current_user()
+
+        if not user:
+            logger.error("require_email_verified used without require_auth", path=request.path)
+            return unauthorized_response(message="Authentication required.")
+
+        # Check if email is verified
+        if not user.email_verified:
+            logger.warning(
+                "Access denied - email not verified",
+                user_id=user.id,
+                email=user.email,
+                path=request.path
+            )
+            return forbidden_response(
+                message="Email verification required. Please check your inbox and verify your email address."
+            )
+
+        logger.debug("Email verification confirmed", user_id=user.id, email=user.email, path=request.path)
+
+        # Call the original function
+        return f(*args, **kwargs)
+
+    return decorated_function
+
+
+def optional_auth(f: Callable) -> Callable:
+    """
+    Decorator for routes that optionally use authentication.
+
+    This decorator will attach the user to g.current_user if authenticated,
+    but will NOT block the request if not authenticated. Use this for routes
+    that should behave differently based on authentication status.
+
+    Args:
+        f: The Flask route function to wrap
+
+    Returns:
+        Wrapped function with optional authentication
+
+    Usage:
+        @app.route('/landing')
+        @optional_auth
+        def landing():
+            user = get_current_user()
+            if user:
+                return f"Welcome back, {user.name}!"
+            else:
+                return "Welcome! Please log in."
+    """
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        # Extract session token from cookie
+        token = extract_session_token()
+
+        if token:
+            # Verify session and get user
+            user = verify_session(token)
+
+            if user:
+                # Attach user to request context
+                g.current_user = user
+                logger.debug("Optional auth - user authenticated", user_id=user.id, path=request.path)
+            else:
+                logger.debug("Optional auth - invalid session", path=request.path)
+        else:
+            logger.debug("Optional auth - no session token", path=request.path)
+
+        # Call the original function regardless of authentication
+        return f(*args, **kwargs)
+
+    return decorated_function
+
+
+def get_user_tier() -> str:
+    """
+    Get the current user's tier.
+
+    Returns:
+        Tier string (free, basic, premium, elite), defaults to 'free' if not authenticated
+
+    Usage:
+        @app.route('/dashboard')
+        @require_auth
+        def dashboard():
+            tier = get_user_tier()
+            return f"Your tier: {tier}"
+    """
+    user = get_current_user()
+    if user:
+        return user.tier
+    return 'free'
+
+
+def is_tier_sufficient(required_tier: str) -> bool:
+    """
+    Check if the current user's tier meets the requirement.
+
+    Args:
+        required_tier: Required tier level
+
+    Returns:
+        True if user's tier is sufficient, False otherwise
+
+    Usage:
+        @app.route('/feature')
+        @require_auth
+        def feature():
+            if is_tier_sufficient('premium'):
+                return "Premium features enabled"
+            else:
+                return "Upgrade to premium for more features"
+    """
+    tier_hierarchy = {
+        'free': 0,
+        'basic': 1,
+        'premium': 2,
+        'elite': 3
+    }
+
+    user = get_current_user()
+    if not user:
+        return False
+
+    user_tier_level = tier_hierarchy.get(user.tier, 0)
+    required_tier_level = tier_hierarchy.get(required_tier, 0)
+
+    return user_tier_level >= required_tier_level

api/app/utils/logging.py

@@ -0,0 +1,272 @@
+"""
+Logging configuration for Code of Conquest.
+
+Sets up structured logging using structlog with JSON output
+and context-aware logging throughout the application.
+"""
+
+import logging
+import sys
+from pathlib import Path
+from typing import Optional
+
+import structlog
+from structlog.stdlib import LoggerFactory
+
+
+def setup_logging(
+    log_level: str = "INFO",
+    log_format: str = "json",
+    log_file: Optional[str] = None
+) -> None:
+    """
+    Configure structured logging for the application.
+
+    Args:
+        log_level: Logging level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
+        log_format: Output format ('json' or 'console')
+        log_file: Optional path to log file
+
+    Example:
+        >>> from app.utils.logging import setup_logging
+        >>> setup_logging(log_level="DEBUG", log_format="json")
+        >>> logger = structlog.get_logger(__name__)
+        >>> logger.info("Application started", version="0.1.0")
+    """
+    # Convert log level string to logging constant
+    numeric_level = getattr(logging, log_level.upper(), logging.INFO)
+
+    # Configure standard library logging
+    logging.basicConfig(
+        format="%(message)s",
+        stream=sys.stdout,
+        level=numeric_level,
+    )
+
+    # Create logs directory if logging to file
+    if log_file:
+        log_path = Path(log_file)
+        log_path.parent.mkdir(parents=True, exist_ok=True)
+
+        # Add file handler
+        file_handler = logging.FileHandler(log_file)
+        file_handler.setLevel(numeric_level)
+        logging.root.addHandler(file_handler)
+
+    # Configure structlog processors
+    processors = [
+        # Add log level to event dict
+        structlog.stdlib.add_log_level,
+        # Add logger name to event dict
+        structlog.stdlib.add_logger_name,
+        # Add timestamp
+        structlog.processors.TimeStamper(fmt="iso"),
+        # Add stack info for exceptions
+        structlog.processors.StackInfoRenderer(),
+        # Format exceptions
+        structlog.processors.format_exc_info,
+        # Clean up _record and _from_structlog keys
+        structlog.processors.UnicodeDecoder(),
+    ]
+
+    # Add format-specific processor
+    if log_format == "json":
+        # JSON output for production
+        processors.append(structlog.processors.JSONRenderer())
+    else:
+        # Console-friendly output for development
+        processors.append(
+            structlog.dev.ConsoleRenderer(
+                colors=True,
+                exception_formatter=structlog.dev.plain_traceback
+            )
+        )
+
+    # Configure structlog
+    structlog.configure(
+        processors=processors,
+        context_class=dict,
+        logger_factory=LoggerFactory(),
+        wrapper_class=structlog.stdlib.BoundLogger,
+        cache_logger_on_first_use=True,
+    )
+
+
+def get_logger(name: str) -> structlog.stdlib.BoundLogger:
+    """
+    Get a configured logger instance.
+
+    Args:
+        name: Logger name (typically __name__)
+
+    Returns:
+        BoundLogger: Configured structlog logger
+
+    Example:
+        >>> logger = get_logger(__name__)
+        >>> logger.info("User logged in", user_id="123", email="user@example.com")
+    """
+    return structlog.get_logger(name)
+
+
+class LoggerMixin:
+    """
+    Mixin class to add logging capabilities to any class.
+
+    Provides a `self.logger` attribute with context automatically
+    bound to the class name.
+
+    Example:
+        >>> class MyService(LoggerMixin):
+        ...     def do_something(self, user_id):
+        ...         self.logger.info("Doing something", user_id=user_id)
+    """
+
+    @property
+    def logger(self) -> structlog.stdlib.BoundLogger:
+        """Get logger for this class."""
+        if not hasattr(self, '_logger'):
+            self._logger = get_logger(self.__class__.__name__)
+        return self._logger
+
+
+# Common logging utilities
+
+def log_function_call(logger: structlog.stdlib.BoundLogger):
+    """
+    Decorator to log function calls with arguments and return values.
+
+    Args:
+        logger: Logger instance to use
+
+    Example:
+        >>> logger = get_logger(__name__)
+        >>> @log_function_call(logger)
+        ... def process_data(data_id):
+        ...     return {"status": "processed"}
+    """
+    def decorator(func):
+        def wrapper(*args, **kwargs):
+            logger.debug(
+                f"Calling {func.__name__}",
+                function=func.__name__,
+                args=args,
+                kwargs=kwargs
+            )
+            try:
+                result = func(*args, **kwargs)
+                logger.debug(
+                    f"{func.__name__} completed",
+                    function=func.__name__,
+                    result=result
+                )
+                return result
+            except Exception as e:
+                logger.error(
+                    f"{func.__name__} failed",
+                    function=func.__name__,
+                    error=str(e),
+                    exc_info=True
+                )
+                raise
+        return wrapper
+    return decorator
+
+
+def log_ai_call(
+    logger: structlog.stdlib.BoundLogger,
+    user_id: str,
+    model: str,
+    tier: str,
+    tokens_used: int,
+    cost_estimate: float,
+    context_type: str
+) -> None:
+    """
+    Log AI API call for cost tracking and analytics.
+
+    Args:
+        logger: Logger instance
+        user_id: User making the request
+        model: AI model used
+        tier: Model tier (free, standard, premium)
+        tokens_used: Number of tokens consumed
+        cost_estimate: Estimated cost in USD
+        context_type: Type of context (narrative, combat, etc.)
+    """
+    logger.info(
+        "AI call completed",
+        event_type="ai_call",
+        user_id=user_id,
+        model=model,
+        tier=tier,
+        tokens_used=tokens_used,
+        cost_estimate=cost_estimate,
+        context_type=context_type
+    )
+
+
+def log_combat_action(
+    logger: structlog.stdlib.BoundLogger,
+    session_id: str,
+    character_id: str,
+    action_type: str,
+    target_id: Optional[str] = None,
+    damage: Optional[int] = None,
+    effects: Optional[list] = None
+) -> None:
+    """
+    Log combat action for analytics and debugging.
+
+    Args:
+        logger: Logger instance
+        session_id: Game session ID
+        character_id: Acting character ID
+        action_type: Type of action (attack, cast, item, defend)
+        target_id: Target of action (if applicable)
+        damage: Damage dealt (if applicable)
+        effects: Effects applied (if applicable)
+    """
+    logger.info(
+        "Combat action executed",
+        event_type="combat_action",
+        session_id=session_id,
+        character_id=character_id,
+        action_type=action_type,
+        target_id=target_id,
+        damage=damage,
+        effects=effects
+    )
+
+
+def log_marketplace_transaction(
+    logger: structlog.stdlib.BoundLogger,
+    transaction_id: str,
+    buyer_id: str,
+    seller_id: str,
+    item_id: str,
+    price: int,
+    transaction_type: str
+) -> None:
+    """
+    Log marketplace transaction for analytics and auditing.
+
+    Args:
+        logger: Logger instance
+        transaction_id: Transaction ID
+        buyer_id: Buyer user ID
+        seller_id: Seller user ID
+        item_id: Item ID
+        price: Transaction price
+        transaction_type: Type of transaction
+    """
+    logger.info(
+        "Marketplace transaction",
+        event_type="marketplace_transaction",
+        transaction_id=transaction_id,
+        buyer_id=buyer_id,
+        seller_id=seller_id,
+        item_id=item_id,
+        price=price,
+        transaction_type=transaction_type
+    )

api/app/utils/response.py

@@ -0,0 +1,337 @@
+"""
+API response wrapper for Code of Conquest.
+
+Provides standardized JSON response format for all API endpoints.
+"""
+
+from datetime import datetime
+from typing import Any, Dict, Optional
+from flask import jsonify, Response
+from app.config import get_config
+
+
+def api_response(
+    result: Any = None,
+    status: int = 200,
+    error: Optional[Dict[str, Any]] = None,
+    meta: Optional[Dict[str, Any]] = None,
+    request_id: Optional[str] = None
+) -> Response:
+    """
+    Create a standardized API response.
+
+    Args:
+        result: The response data (or None if error)
+        status: HTTP status code
+        error: Error information (dict with 'code', 'message', 'details')
+        meta: Metadata (pagination, etc.)
+        request_id: Optional request ID for tracking
+
+    Returns:
+        Response: Flask JSON response
+
+    Example:
+        >>> return api_response(
+        ...     result={"user_id": "123"},
+        ...     status=200
+        ... )
+
+        >>> return api_response(
+        ...     error={
+        ...         "code": "INVALID_INPUT",
+        ...         "message": "Email is required",
+        ...         "details": {"field": "email"}
+        ...     },
+        ...     status=400
+        ... )
+    """
+    config = get_config()
+
+    response_data = {
+        "app": config.app.name,
+        "version": config.app.version,
+        "status": status,
+        "timestamp": datetime.utcnow().isoformat() + "Z",
+        "request_id": request_id,
+        "result": result,
+        "error": error,
+        "meta": meta
+    }
+
+    return jsonify(response_data), status
+
+
+def success_response(
+    result: Any = None,
+    status: int = 200,
+    meta: Optional[Dict[str, Any]] = None,
+    request_id: Optional[str] = None
+) -> Response:
+    """
+    Create a success response.
+
+    Args:
+        result: The response data
+        status: HTTP status code (default 200)
+        meta: Optional metadata
+        request_id: Optional request ID
+
+    Returns:
+        Response: Flask JSON response
+
+    Example:
+        >>> return success_response({"character_id": "123"})
+    """
+    return api_response(
+        result=result,
+        status=status,
+        meta=meta,
+        request_id=request_id
+    )
+
+
+def error_response(
+    code: str,
+    message: str,
+    status: int = 400,
+    details: Optional[Dict[str, Any]] = None,
+    request_id: Optional[str] = None
+) -> Response:
+    """
+    Create an error response.
+
+    Args:
+        code: Error code (e.g., "INVALID_INPUT")
+        message: Human-readable error message
+        status: HTTP status code (default 400)
+        details: Optional additional error details
+        request_id: Optional request ID
+
+    Returns:
+        Response: Flask JSON response
+
+    Example:
+        >>> return error_response(
+        ...     code="NOT_FOUND",
+        ...     message="Character not found",
+        ...     status=404
+        ... )
+    """
+    error = {
+        "code": code,
+        "message": message,
+        "details": details or {}
+    }
+
+    return api_response(
+        error=error,
+        status=status,
+        request_id=request_id
+    )
+
+
+def created_response(
+    result: Any = None,
+    request_id: Optional[str] = None
+) -> Response:
+    """
+    Create a 201 Created response.
+
+    Args:
+        result: The created resource data
+        request_id: Optional request ID
+
+    Returns:
+        Response: Flask JSON response with status 201
+
+    Example:
+        >>> return created_response({"character_id": "123"})
+    """
+    return success_response(
+        result=result,
+        status=201,
+        request_id=request_id
+    )
+
+
+def accepted_response(
+    result: Any = None,
+    request_id: Optional[str] = None
+) -> Response:
+    """
+    Create a 202 Accepted response (for async operations).
+
+    Args:
+        result: Job information or status
+        request_id: Optional request ID
+
+    Returns:
+        Response: Flask JSON response with status 202
+
+    Example:
+        >>> return accepted_response({"job_id": "abc123"})
+    """
+    return success_response(
+        result=result,
+        status=202,
+        request_id=request_id
+    )
+
+
+def no_content_response(request_id: Optional[str] = None) -> Response:
+    """
+    Create a 204 No Content response.
+
+    Args:
+        request_id: Optional request ID
+
+    Returns:
+        Response: Flask JSON response with status 204
+
+    Example:
+        >>> return no_content_response()
+    """
+    return success_response(
+        result=None,
+        status=204,
+        request_id=request_id
+    )
+
+
+def paginated_response(
+    items: list,
+    page: int,
+    limit: int,
+    total: int,
+    request_id: Optional[str] = None
+) -> Response:
+    """
+    Create a paginated response.
+
+    Args:
+        items: List of items for current page
+        page: Current page number
+        limit: Items per page
+        total: Total number of items
+        request_id: Optional request ID
+
+    Returns:
+        Response: Flask JSON response with pagination metadata
+
+    Example:
+        >>> return paginated_response(
+        ...     items=[{"id": "1"}, {"id": "2"}],
+        ...     page=1,
+        ...     limit=20,
+        ...     total=100
+        ... )
+    """
+    pages = (total + limit - 1) // limit  # Ceiling division
+
+    meta = {
+        "page": page,
+        "limit": limit,
+        "total": total,
+        "pages": pages
+    }
+
+    return success_response(
+        result=items,
+        meta=meta,
+        request_id=request_id
+    )
+
+
+# Common error responses
+
+def unauthorized_response(
+    message: str = "Unauthorized",
+    request_id: Optional[str] = None
+) -> Response:
+    """401 Unauthorized response."""
+    return error_response(
+        code="UNAUTHORIZED",
+        message=message,
+        status=401,
+        request_id=request_id
+    )
+
+
+def forbidden_response(
+    message: str = "Forbidden",
+    request_id: Optional[str] = None
+) -> Response:
+    """403 Forbidden response."""
+    return error_response(
+        code="FORBIDDEN",
+        message=message,
+        status=403,
+        request_id=request_id
+    )
+
+
+def not_found_response(
+    message: str = "Resource not found",
+    request_id: Optional[str] = None
+) -> Response:
+    """404 Not Found response."""
+    return error_response(
+        code="NOT_FOUND",
+        message=message,
+        status=404,
+        request_id=request_id
+    )
+
+
+def validation_error_response(
+    message: str,
+    details: Optional[Dict[str, Any]] = None,
+    request_id: Optional[str] = None
+) -> Response:
+    """400 Bad Request for validation errors."""
+    return error_response(
+        code="INVALID_INPUT",
+        message=message,
+        status=400,
+        details=details,
+        request_id=request_id
+    )
+
+
+def rate_limit_exceeded_response(
+    message: str = "Rate limit exceeded",
+    request_id: Optional[str] = None
+) -> Response:
+    """429 Too Many Requests response."""
+    return error_response(
+        code="RATE_LIMIT_EXCEEDED",
+        message=message,
+        status=429,
+        request_id=request_id
+    )
+
+
+def internal_error_response(
+    message: str = "Internal server error",
+    request_id: Optional[str] = None
+) -> Response:
+    """500 Internal Server Error response."""
+    return error_response(
+        code="INTERNAL_ERROR",
+        message=message,
+        status=500,
+        request_id=request_id
+    )
+
+
+def premium_required_response(
+    message: str = "This feature requires a premium subscription",
+    request_id: Optional[str] = None
+) -> Response:
+    """403 Forbidden for premium-only features."""
+    return error_response(
+        code="PREMIUM_REQUIRED",
+        message=message,
+        status=403,
+        request_id=request_id
+    )