I just noticed that my DTPO trash was over 4,000 entries, 90% of them from my RSS Feeds database. So, knowing that I didn’t need deleted RSS posts, I selected the Empty Trash menu item. The Trash emptied quite well but when I returned to my RSS Feeds database, I noticed that each feed was beginning to increment, some of them pretty fast. Suddenly instead of having three or four unread posts, I wound up with 780!
Now I begin the laborious task of going through 40 feeds and deleting a bunch of unnecessary posts.
FWIW – Make a smart group in the database where your feeds (assuming they might be in a dedicated database?) with Kind = HTML. This will find all documents and put them in one view, where you can sort by whatever date you want and delete huge blocks.