QueuePool Limit Reached - When FastAPI Runs Out of Database Connections

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Hello developers, Today I would like to talk about an error message with a real talent for sending you in the wrong direction: sqlalchemy.exc.TimeoutError: QueuePool limit of size 5 overflow 10 reached, connection timed out, timeout 30.00 (Background on this error at: https://sqlalche.me/e/20/3o7r) If your FastAPI app talks to a database through SQLAlchemy, chances are high you will meet it sooner or later. Not on your machine, of course. It shows up in production, after a few quiet hours, under load. And the reflex is always the same: the pool is too small, so let us make it bigger. pool_size

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