Database-Connections time out in long running Applications without request context.

[kahnert]

If you use the Django-ORM outside of request handling, in uWSGI mules for example, connections time out. The expected behavior would be to reconnect on the next command issued.
But because the checks for unusable connections is bound to request signals those get never called.

An easy solution would be to call self.close_if_unusable_or_obsolete() at first in BaseDatabaseWrapper.ensure_connection.

[kahnert]

Since this introduces an infinite recursion, I changed it to if self.connection is not None and not self.is_usable(): self.close() in my testing setup.

[Aymeric Augustin]

I'd say it's up to the application to close the connection when it knows it isn't going to use it for some time that may exceed the database's connection timeout :)

What database backend are you using? Isn't this a duplicate of #21597?