The endpoints screen could only create and edit servers, so a mistyped or retired endpoint stayed in the list forever. Tasks reference endpoints without ON DELETE CASCADE, so a referenced endpoint is refused with 409 and a count of the tasks using it rather than cascading away migration history. The foreign-key violation is mapped to the same status to cover a task created between check and delete. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>