chat history with the NPC modal

public_web/app/__init__.py

@@ -12,6 +12,7 @@ import structlog
 import yaml
 import os
 from pathlib import Path
+from datetime import datetime, timezone
 
 
 logger = structlog.get_logger(__name__)
@@ -61,6 +62,34 @@ def create_app():
     app.register_blueprint(character_bp)
     app.register_blueprint(game_bp)
 
+    # Register Jinja filters
+    def format_timestamp(iso_string: str) -> str:
+        """Convert ISO timestamp to relative time (e.g., '2 mins ago')"""
+        if not iso_string:
+            return ""
+        try:
+            timestamp = datetime.fromisoformat(iso_string.replace('Z', '+00:00'))
+            now = datetime.now(timezone.utc)
+            diff = now - timestamp
+
+            seconds = diff.total_seconds()
+            if seconds < 60:
+                return "Just now"
+            elif seconds < 3600:
+                mins = int(seconds / 60)
+                return f"{mins} min{'s' if mins != 1 else ''} ago"
+            elif seconds < 86400:
+                hours = int(seconds / 3600)
+                return f"{hours} hr{'s' if hours != 1 else ''} ago"
+            else:
+                days = int(seconds / 86400)
+                return f"{days} day{'s' if days != 1 else ''} ago"
+        except Exception as e:
+            logger.warning("timestamp_format_failed", iso_string=iso_string, error=str(e))
+            return iso_string
+
+    app.jinja_env.filters['format_timestamp'] = format_timestamp
+
     # Register dev blueprint only in development
     env = os.getenv("FLASK_ENV", "development")
     if env == "development":