It would be useful for Sonarr to also search past RSS results when doing a manual search. Most torrent indexers are only available by RSS, so there’s no way to get content from those feeds with a manual search. Sonarr already has past RSS results, let’s include them in the search results.
Sonarr has received them and processed them, but it maintains no memory of them. Caching them is something we have discussed, but hasn’t yet been made a reality. It’s still something we’re considering.