Personally I hate that sonarr is stuck on thetvdb when plex/jellyfin both primarily use tmdb. Usually it’s fine but for certain shows the differences can be unreconcilable.

I’ve been eyeballing https://github.com/maxdorninger/MediaManager but haven’t gotten around to it yet

Another one I found: Which is just this I think https://medium.com/@azalben/re-can-i-drink-this-delicious-sounding-bleach-8b9db1326f9c

Granted I’m baiting it and it does say not to drink it.