I think it should be the version of posts within 15 minutes (if I am remembering correctly) after published. It will be more matched with forum data. Only posts edited after 15 minutes will be shown with editing history and last editing time.
Posts can be edited for 10 minutes without showing (or even keeping!) an edit history. But I'm not aiming to match the forum, I'm aiming to show the unedited post. And I can only download posts from
recent when they're new, searching for posts that are 10 minutes old will be more work.