Recently one of our moderators accidentally deleted a user whose post was flagged in the moderation queue by the system. Unfortunately, it does not seem like there is a feature to undo the deletion in the web interface. To try to avoid this happening again, we set
delete user max post age to 0:
However, I am still able to delete a user via the moderation review queue. Is there a way to disallow deletion of users, or a way to undo the deletion via the web interface?