I have a few shows like the Daily Show I'll sometimes watch the monologue but not the full episode.
Plex has a setting to "Keep unwatched episodes" which will delete never-watched episodes, and another to "delete X days after viewing" for fully-watched episodes. But if an episode is partially watched, neither applies and it just sits there.
This seems like a weird oversight and I am wondering if there's a setting I'm missing. I can't be the first person who wants "delete 7 days after adding regardless of anything else"
This is probably too large of a hammer, but you could change the setting that determines when something is marked as played to like, 10% of the video, and then make use of the “delete X days after viewing” feature