utils: remove Session after we are done using it in set_app_settings When the Kallithea WSGI application or celeryd is started, TurboGears app_config.make_base_app calls Kallithea app_cfg.setup_configuration which runs utils.set_app_settings. That function will read settings from the database and store them in the global config. It uses a database session which is created on demand, but this session was not dismissed but left around for the next thing that asked for a database session. MySQL will by default close connections after 1 hour, so when celery tried to run a task after 1 hour of inactivity, it could fail because of the closed connection. utils.set_app_settings must thus remove the Session after use, just like auth.set_available_permissions do. This will thus fix for example some MySQL connection problems seen with Celery.