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Only thumbnail bytes were ever durable in media_cache.db — every other
derived field (photo width/height/EXIF, video ffprobe duration/dims,
audio cover art) lived solely on the in-memory GroupIndex entry, so a
node restart re-decoded every photo through Pillow, re-ran ffprobe on
every video, and re-scanned for every album cover from scratch, even
though the answers already sat in the cache.
Adds photo_meta and video_meta tables (content-only fields, keyed by
file_id) and checks them before doing the expensive work. Audio gets no
new table: mutagen reads tags and duration in one inseparable call, so
caching duration alone buys nothing — instead cover-art extraction alone
is skipped via a new skip_cover flag when a cached cover already exists.
Deliberately excluded from all three caches: anything derived from the
filename or folder path (video display_title/season/episode via guessit,
audio artist/album folder-fallback) — those must keep being recomputed
fresh so a rename/move is still correctly re-derived by the existing
_reenrich_renamed_*_entries mechanisms, instead of silently handing back
a stale parse under the new name/location.
Regression tests prove cache reuse by deleting the source file (or cover)
between two enrichment runs, and prove rename/move correctness survives
the new cache by renaming/moving to a path that never exists on disk.
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Implements docs/mediacenter.md: a "Videos" group application built on the
existing files index rather than a separate catalogue. On the node side,
new indexer enrichment (technical probe, filename/season parsing, thumbnail
generation) runs per-file once an operator has chosen a video_root for the
group, plus a TMDB client for on-demand poster/metadata lookups (never
client-side, thumbnails delivered over the existing chunk path). On the hub
side, a new video-app.js renders a lazily-mounted poster grid or a
thumbnail-only flat list, with TMDB entirely optional per group.
Along the way: the global apps registry now drives Settings' default-tab
picker instead of a hardcoded list, and the video_root is configured from
group Settings (like uploads) rather than from Files, with the node
refusing to run any TMDB/thumbnail work until one is set.
Fixes several bugs found via live testing against a real library, notably
a race between two effects writing the same "image ready" state that could
leave a poster grid spinning forever on a same-tab revisit — see
mediacenter.md §5.4 for the full account of each one.
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