I recently found that the looooooooong chat was removed and it improved the response time of coding. That was great. But there was a downside to it. I lost many important milestones, that i might have wanted to restore back to. It will be great if you allow the users to mark important milestones to retain when the cleaning of chat happens. That way they will be able to restore back to preferred versions in case required.

Or they will be stuck with the experimental request that led to more damage than good.