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07af29fbb4
An in-place cover-file swap followed by a quick scan updates only the folder's images_updated_at: no tracks are imported, so the album row never moves and ArtworkUpdatedAt() stayed at the old value. The Jellyfin DTO then kept emitting the previous stored blurhash, and clients that key their cover caches on it never refetched the image, so the served-bytes recompute could never run. The album select now surfaces the newest folder images_updated_at (bare-column correlated subquery over json_each(folder_ids), so the datetime decltype survives and scans as time.Time) and ArtworkUpdatedAt() folds it in. Benchmarked on a 96K track production copy: ~90us/page added, no query-plan change; the subquery is a PK point lookup per folder with at most two rows to order. Artist images and playlist sidecars have the same theoretical gap but their timestamps cannot be derived in SQL; they remain a documented follow-up.