feat: cron worker for renewal notifs

main.py

@@ -1,8 +1,24 @@
+import asyncio
+from contextlib import asynccontextmanager, suppress
+
 from fastapi import FastAPI
 
 from routes import routers
+from services.notifications import run_subscription_notifications
 
-app = FastAPI(debug=True)
+
+@asynccontextmanager
+async def lifespan(_: FastAPI):
+    task = asyncio.create_task(run_subscription_notifications())
+    try:
+        yield
+    finally:
+        task.cancel()
+        with suppress(asyncio.CancelledError):
+            await task
+
+
+app = FastAPI(debug=True, lifespan=lifespan)
 
 for r in routers:
     app.include_router(r)