Cry Uncle and be done with it.
Because it is not one table impacted so if anyone posted since the delete ??????
Most of us have a archive forum to move them to instead of deleting them for this very reason.
This is sop.
Here the forum is called the boneyard only accessible to moderators and admins.
The best thing to do is manually recreate the post so it updates the topic , post tables and adds back to the recent posts and user
