root cause: all five job-insert sites in review.ts blindly inserted a
'pending' row, so a double-click on approve (or an overlap between
/approve-all and individual /approve) wrote N jobs for the same item.
job 1 stripped subtitles + reordered audio; jobs 2..N then ran the
same stale stream-index command against the already-processed file
and ffmpeg bailed with 'Stream map matches no streams'.
fix: funnel every insert through enqueueAudioJob(), which only writes
when no pending job already exists for that item. covers approve,
retry, approve-all, season approve-all, series approve-all.
