fix(meal-planner): add GET prep-session endpoint, fix list_plans schema, replace assert with ValueError

- Add GET /{plan_id}/prep-session endpoint so frontend can retrieve existing sessions without creating
- Fix list_plans response_model from list[dict] to list[PlanSummary] with proper _plan_summary() mapping
- Replace assert in store.update_prep_task with ValueError (assert is stripped under python -O)
- Add day_of_week 0-6 validation to upsert_slot endpoint
- Remove MagicMock sqlite artifact files left by pytest (already in .gitignore)

app/api/endpoints/meal_plans.py

@@ -92,12 +92,17 @@ async def create_plan(
     return _plan_summary(plan, slots)
 
 
-@router.get("/", response_model=list[dict])
+@router.get("/", response_model=list[PlanSummary])
 async def list_plans(
     session: CloudUser = Depends(get_session),
     store: Store = Depends(get_store),
-) -> list[dict]:
-    return await asyncio.to_thread(store.list_meal_plans)
+) -> list[PlanSummary]:
+    plans = await asyncio.to_thread(store.list_meal_plans)
+    result = []
+    for p in plans:
+        slots = await asyncio.to_thread(store.get_plan_slots, p["id"])
+        result.append(_plan_summary(p, slots))
+    return result
 
 
 @router.get("/{plan_id}", response_model=PlanSummary)
@@ -124,6 +129,8 @@ async def upsert_slot(
     session: CloudUser = Depends(get_session),
     store: Store = Depends(get_store),
 ) -> SlotSummary:
+    if day_of_week < 0 or day_of_week > 6:
+        raise HTTPException(status_code=422, detail="day_of_week must be 0-6.")
     if meal_type not in VALID_MEAL_TYPES:
         raise HTTPException(status_code=422, detail=f"Invalid meal_type '{meal_type}'.")
     plan = await asyncio.to_thread(store.get_meal_plan, plan_id)
@@ -197,6 +204,28 @@ async def get_shopping_list(
 
 # ── prep session ──────────────────────────────────────────────────────────────
 
+@router.get("/{plan_id}/prep-session", response_model=PrepSessionSummary)
+async def get_prep_session(
+    plan_id: int,
+    session: CloudUser = Depends(get_session),
+    store: Store = Depends(get_store),
+) -> PrepSessionSummary:
+    plan = await asyncio.to_thread(store.get_meal_plan, plan_id)
+    if plan is None:
+        raise HTTPException(status_code=404, detail="Plan not found.")
+    prep_session = await asyncio.to_thread(store.get_prep_session_for_plan, plan_id)
+    if prep_session is None:
+        raise HTTPException(status_code=404, detail="No prep session for this plan.")
+    raw_tasks = await asyncio.to_thread(store.get_prep_tasks, prep_session["id"])
+    return PrepSessionSummary(
+        id=prep_session["id"],
+        plan_id=plan_id,
+        scheduled_date=prep_session["scheduled_date"],
+        status=prep_session["status"],
+        tasks=[_prep_task_summary(t) for t in raw_tasks],
+    )
+
+
 @router.post("/{plan_id}/prep-session", response_model=PrepSessionSummary)
 async def create_prep_session(
     plan_id: int,

app/db/store.py

@@ -1115,7 +1115,9 @@ class Store:
     def update_prep_task(self, task_id: int, **kwargs: object) -> dict | None:
         allowed = {"duration_minutes", "sequence_order", "notes", "equipment"}
         updates = {k: v for k, v in kwargs.items() if k in allowed and v is not None}
-        assert all(k in allowed for k in updates), f"Unexpected column(s): {set(updates) - allowed}"
+        invalid = set(updates) - allowed
+        if invalid:
+            raise ValueError(f"Unexpected column(s) in update_prep_task: {invalid}")
         if not updates:
             return self._fetch_one("SELECT * FROM prep_tasks WHERE id = ?", (task_id,))
         set_clause = ", ".join(f"{k} = ?" for k in updates)