未知（继上次中断）

backend/app/main.py

@@ -1,3 +1,4 @@
+import asyncio
 from contextlib import asynccontextmanager
 
 from fastapi import FastAPI
@@ -11,10 +12,13 @@ from app.crud.user import ensure_admin_exists
 from app.db.base import Base
 from app.db.session import SessionLocal, engine
 from app.services.fee_seed import seed_demo_fees
+from app.services.visit_scheduler import run_daily_lost_visit_job
 
 
 @asynccontextmanager
 async def lifespan(_: FastAPI):
+    stop_event = asyncio.Event()
+    scheduler_task = asyncio.create_task(run_daily_lost_visit_job(stop_event))
     # Ensure models are imported so metadata is populated
     from app.models import user as user_model  # noqa: F401
 
@@ -26,6 +30,8 @@ async def lifespan(_: FastAPI):
             await ensure_admin_exists(session)
             await seed_demo_fees(session)
     yield
+    stop_event.set()
+    await scheduler_task
 
 
 async def _ensure_legacy_primary_keys(conn) -> None: