MusicVideosUpdate and AddEpisodicGenres migrations used TypeORM
entity classes which reference columns that don't exist at their
migration timestamp (e.g. trailer_old, later entity fields).
Rewrote both to use raw SQL INSERT/UPDATE statements.
Also bumped CACHEBUST to v3 to force backend image rebuild.
Co-authored-by: Cursor <cursoragent@cursor.com>
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