CSV columns expected (matches the Export CSV format): imdb_id, title, year, released, imdb_rating, my_rating, rated, genre, runtime_minutes, director, plot, actors_json, sexual_severity, sexual_details_json, triggers_json, dog_die_text, poster, trailer_url, watch_json, watch_at, status, is_favorite, notes, last_watched, locked, added_at. Only title or imdb_id is strictly required. Duplicates (by IMDB ID) are skipped.