Videos take noticeably long to start. On Plex, tapping Play refetched
/library/metadata/{id} network-first even though the detail screen wrote
a strict superset of that exact payload under the same cache key seconds
earlier. On Jellyfin/Emby, playback start issued a full-detail item GET
before the PlaybackInfo negotiation, and the video controls issued the
same heavy GET again while the stream was opening (#1784) — the most
expensive queries a small home server serves, paid two to three times
per start.
Add ApiCache.getIfFresh over the existing cachedAt column and serve
rows younger than playbackMetadataCacheFreshness (5 min) without a
round trip. Plex guards with the strict stream-detail check
(_plexMetadataHasStreamDetail) so a thin row written by
getPlaybackExtras' lean fetch still goes to the network; Jellyfin's
row has a single full-shape writer, so fetchPlaybackBundle and
fetchPlaybackExtras share the new fetchItemFreshCacheFirst. Any miss,
stale, thin, or malformed row falls through to the unchanged
network-first path, and offline behavior is untouched.
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