Why on earth would you care?
But I guess you could go through the database and start replacing the forum numbers wherever they appear. Off the top of my head, that would be forums, posts, topics, forums_prune, etc. Then you would have to go through all the posts and change the internal links, because those would no longer work.
Then, if you added or deleted a forum, you could do it all over again.
Not worth it.
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