Getting error 500 when trying to access CopyPatrol (https://tools.wmflabs.org/copypatrol/fr)
Certainly related to T216208: ToolsDB overload and cleanup.
IMO a user-friendly message should appear when DB is unreachable.
It's back up and running for now, but until T216208 is resolved more issues may arise.
Things should be stable now. Indeed we should have better error handling. Saving that for a rainy day.