I left this out for simplicity. What would you use this list of watched movies for?mayaa commented
I feel like the watched, or seen list if you prefer, is something to distinguish a film you have purchased (as a collection) from a film you have just watched but do not own a copy of. Because I feel I can't add any movie I've seen to collection unless i have it in my library at home. Also the idea for netflix section or other streaming site's list of want to watch/have seen type of list? To keep track of wish list to watch and already seen movies. But i want to stress a need of this kind of thing for series as well. For shows you would like to watch but are not currently following and a list for shows you have seen but have stopped airing (maybe only show name in this section as a whole to check so you don't have to check every episode of 10 seasons or more). That way you know every thing you've seen. And bsck to movies options also maumye an option if you have seen the film on stream, theatre, or other....