How to avoid after_transaction in some cases

* %DBConnection.ConnectionError{message: "could not checkout the connection owned by #PID<0.1169.0>. When using the sandbox, connections are shared, so this may imply another process is using a connection. Reason: connection not available and request was dropped from queue after 120ms. You can configure how long requests wait in the queue using :queue_target and :queue_interval. See DBConnection.start_link/2 for more information", severity: :error, reason: :queue_timeout}