Well then, go to the Forum Manager page and delete the forums. I think it will delete the threads in the forums too. Your server may not like this if you have a large amount of posts in the forums, so you may need to delete all the threads via Threads > Prune first. After that is all done, you could edit the tables (forum, thread, post) via phpMyAdmin to set the auto_increment back to 1. I would definitely do this on a test database first!!!! And make sure you have a backup database before you try anything.
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