未知（继上次中断）

backend/app/services/visit_scheduler.py

@@ -0,0 +1,24 @@
+import asyncio
+from datetime import datetime, timedelta
+from zoneinfo import ZoneInfo
+
+from app.crud import visit as visit_crud
+from app.db.session import SessionLocal
+
+
+async def _run_mark_lost_once() -> None:
+    async with SessionLocal() as session:
+        await visit_crud.mark_overdue_as_lost_global(session)
+
+
+async def run_daily_lost_visit_job(stop_event: asyncio.Event) -> None:
+    tz = ZoneInfo("Asia/Shanghai")
+    while not stop_event.is_set():
+        now = datetime.now(tz)
+        next_midnight = (now + timedelta(days=1)).replace(hour=0, minute=0, second=0, microsecond=0)
+        sleep_seconds = max(1, (next_midnight - now).total_seconds())
+        try:
+            await asyncio.wait_for(stop_event.wait(), timeout=sleep_seconds)
+            break
+        except asyncio.TimeoutError:
+            await _run_mark_lost_once()