Since you’re going to be recreating your TV shows library anyway, I would suggest taking this opportunity to separate your regular TV and DVR TV into two libraries. That is, have two separate TV shows-type libraries.
This offers some advantages. For example, if you use commercial skipping you can configure your DVR library to perform ad detection on all files instead of recorded ones only. This is useful if you need to Plex Dance a show for any reason; it will get ad detection performed again (which won’t happen if the library is set to perform detection for only recorded items).
