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TMDb's release_dates/content_ratings blocks were already fetched via append_to_response but discarded at normalization -- every downstream layer (ingestion write, repository read, schema, service) was unbuilt. Adds the full pipeline: NormalizedReleaseDate + get_or_create_certification, a shared polymorphic sync/read (movie and series both use it), and MovieDetailOut/SeriesDetailOut certification + release_dates fields. Series content_ratings has no date of its own, so each rating is anchored to the show's first_air_date with release_type="tv". Co-Authored-By: Claude Sonnet 5 <[email protected]>