Reset header index for a group

[gunslnger]

I'm using 6.73 and I've messed up one of my groups, so now all downloaded headers are marked as old and I can only see anything by changing the display age range. How can I reset the group back to as if it was empty? Back when the newsgroup index was a text file, I could just edit it back to have headers 1:1 and then I could remark everything as read and I'd be fixed from that point on. Now that it's in a database, I don't know how to clear the header numbers. Unsubscribing from the group doesn't do it. Any ideas? Maybe this is a feature request?

[Quade]

Right click a group(s) "Post Storage/Use Download Age". Then set a short "Download Age" then download headers normally.

You could "right click/Delete Stored Posts" too.