Get a free token at themoviedb.org

Create a Twitch app at dev.twitch.tv/console/apps (Confidential) and paste its Client-ID and Client-Secret.

Automatic nightly push of both databases over WebDAV (HTTPS only). The password is stored encrypted and never shown.

Import watched history and watchlist from a Trakt export

Import ratings from an IMDB CSV export

Import a games CSV (columns: Game, Status, Platform, Completed, Notes)