After reading this topic and realizing that Discourse had no built-in pruning system, I came to make this post.
This would be a system where Discourse would automatically delete threads older than x. It should be configured on a per-category basis, much like the autolock methods.
This would be especially useful for categories or topics that are relevant for only a very short amount of time, at which point they’ll never be looked at or heard from again. I personally would use this to provide my forum with a sandbox where they can test Discourse’s features and formatting. Within about an hour or two, the topic would be deleted and everything will return to normal.