feat: define all 8 SQLModel tables

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/models/progress_log.py

@@ -0,0 +1,39 @@
+"""ProgressLog model for tracking progression suggestions and outcomes.
+
+Records what the progression engine suggested vs what the user actually did.
+"""
+
+import datetime as dt
+from typing import Optional
+
+from sqlmodel import Field, SQLModel
+
+
+class ProgressLog(SQLModel, table=True):
+    """A progression tracking entry for a specific exercise.
+
+    Attributes:
+        id: Primary key, auto-incremented.
+        user_id: FK to users table.
+        exercise_id: FK to exercises table.
+        date: The date this progression entry applies to.
+        suggested_reps: What the engine recommended.
+        suggested_weight: What the engine recommended.
+        actual_reps: What the user actually did.
+        actual_weight: What the user actually used.
+        progression_applied: Type of progression (e.g., "reps_increase", "weight_increase", "deload").
+        created_at: Timestamp when the record was created.
+    """
+
+    __tablename__ = "progress_log"
+
+    id: Optional[int] = Field(default=None, primary_key=True)
+    user_id: int = Field(foreign_key="users.id", index=True)
+    exercise_id: int = Field(foreign_key="exercises.id")
+    date: dt.date = Field(default_factory=dt.date.today)
+    suggested_reps: Optional[int] = Field(default=None)
+    suggested_weight: Optional[str] = Field(default=None)
+    actual_reps: Optional[int] = Field(default=None)
+    actual_weight: Optional[str] = Field(default=None)
+    progression_applied: Optional[str] = Field(default=None)
+    created_at: dt.datetime = Field(default_factory=dt.datetime.utcnow)