The codebase implements an expiry mechanism for user accounts in a PostgreSQL database using SQLAlchemy ORM within an asynchronous Python application. It ensures that expired accounts are deactivated by setting their is_active status to false when their expires_at timestamp is less than or equal to the current time. This operation is performed efficiently with a single SQL update statement per cycle, avoiding unnecessary row iteration and memory loading of data in Python. The process runs as an asyncio task within the lifespan of a FastAPI application, ensuring it starts on app initialization and stops gracefully during shutdown. To prevent concurrency issues, the system operates under the constraint that only one uvicorn worker should be used to avoid multiple processes executing the same update query concurrently.
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