Separate SQLite file (database/video_library.db, env VIDEO_DATABASE_PATH),
fully disconnected from music — never imported by music, imports nothing from
music, no shared write lock.
Schema (database/video_schema.sql), designed to dodge the music DB's known
pain points:
- movies; shows->seasons->episodes; channels->channel_videos (YouTube as a
first-class peer); media_files (the library); downloads (queue+history);
activity feed; root_folders / quality_profiles / video_settings config.
- No polymorphic ids: media_files/downloads use separate nullable FKs + a CHECK
that exactly one owner is set; real cascades.
- Explicit external-id columns (tmdb/tvdb/imdb/youtube), no source-id blob.
- Watchlist/Wishlist/Calendar are DERIVED VIEWS over monitored + file state
(single source of truth, can't drift like music's wishlist table did).
VideoDatabase mirrors music's conventions (WAL, foreign_keys ON, 30s busy
timeout, Row factory, once-per-process init, user_version backstop) but is an
independent implementation. 13 seam tests: schema builds, CHECK constraints
reject bad rows, cascades fire, views return correct membership, KV roundtrips,
and a guard that the module imports nothing from music.
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