Gusted af8b2250c4 Prevent dangling user redirects (#21856) (#21858)
- Backport #21856
- It's possible that the `user_redirect` table contains a user id that
no longer exists.
  - Delete a user redirect upon deleting the user.
- Add a check for these dangling user redirects to check-db-consistency.
2022-11-18 22:25:00 +08:00
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