Hello! I would like to know if there is a way to clear revisions of threads.
Thank you in advance!
There is no option for cleaning revisions. However you should not worry, it's already designed to keep minimal revisions in database. It stores maximum 3 revisions and delete old revisions after each new saving. It doesn't save revisions if there is no any change in content, so if you leave the editor for one hour it'll not save new revisions. Also after submitting the new post it deletes all revisions related to that post.
In other words, wpForo post revision system works maximum clean and doesn't keep revisions for long time, you can be 100% sure, this is not an unintuitive piece of code. This is a very smart solution.