Hi @tiangolo , I do not have a reproductible test, yet here is what I have done:

• before fix, restart the db container, and query the API backend -> 500 errors come at once, in numbers

• after fix, restart the db container with same conditions -> there is a few-seconds lag in the first query (probably timeout and/or retrials from the connection pool), then a couple of 500 errors before the DB is up again

I have also checked the logs, and there are no more OperationalErrors after applying the fix (I will check again during the week)

From my point of view, the issue is fixed, but not automatically tested. Which does not really concern me, since the management of the connection cool is on the SQLAlchemy level, and therefore tested by them