I have only tried this for small files but it may be helpful for others: https://github.com/JMS1717/8mb.local

I have used OliveTin to do something similar: https://github.com/OliveTin/OliveTin

I used to use JustWatch before self hosting. They don’t make it easy to get you data out of their system (last time I tried)

I tried that too. The things I like about Yamtrack is that it does books too. It also does imports well and integrates with Jellyfin and Plex

I self-host Yamtrack and find it really useful: https://github.com/FuzzyGrim/Yamtrack