Forget movie from Seen if not found on external

Hi Guys,

Quick question. Is it possible to have something in config to auto forget movies that are not found on my external. So for instance flexget grabs a movie and downloads it. I find that the movie is bad or whatever. I delete it from the external manually. Flexget checks the external movie folder to see whats there and compares to the movie seen list. If a move is on the seen list but is not found on the external auto forget the movie to allow it to re download?

Please let me know as manually forgetting movies is difficult when you need to delete multiple movies.