Purge items in a feed
If I am right in assuming that the 500 item limit counts filtered items in a feed, then I suggest implementing a command to to manually purge some or all items in a feed.
John Smith shared this idea
No. There is 500 items in feed total. Filtering just hides some of them. So purging won’t change anything.
Plus other users can read the same feed, so purging is actually not a real purging but an additional state, that some items should be hidden for some users. I don’t want to add this complexity.