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[TheDreadPirate]

I'm not sure if "locking" the metadata works when you move files around. I think it will still honor the lock.

Your other option is to use NFOs to provide your metadata, but you'd need to disable ALL metadata providers in the library to ensure that Jellyfin makes no attempts to scrape online DBs for metadata. If you have other shows that need online metadata, you either need to use an external tool to pull down metadata and write NFOs (Tiny Media Manager), or keep your "local metadata only" shows in a separate library from your "online metadata" shows.