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35d08a25a3
Adversarial review findings: - CopyAttributes copied uploaded_image/cover_art_updated_at unconditionally, so merging an album without a cover into one with a cover (retag onto an existing album ID, or phase-2 moved-track matching) blanked the destination's uploaded cover. Skip empty/NULL source values, mirroring the created_at guard, and make the mock faithful to the same semantics. - The disc and mediafile artwork readers did not fold cover_art_updated_at into their cache keys, so song/disc art reached through the fromAlbum fallback kept serving stale bytes after a cover upload or delete. - The UI cover cache-buster compared timestamps lexicographically; mixed offset/fractional formats could pick the older one. Compare as dates.