Slice 3a — extends the producer set onto the SSE bus.
quarantine events (5 producer sites):
- quarantine.flagged (user-side flag): broadcast so the flagger's other
clients invalidate their Hidden tab and admins' clients invalidate
their queue.
- quarantine.unflagged (user-side unflag): scoped to the user.
- quarantine.resolved / .file_deleted / .deleted_via_lidarr (admin
actions): broadcast because a single admin action can affect every
user who'd flagged that track.
playlist events (6 producer sites):
- playlist.created / .updated / .deleted: owner-scoped.
- playlist.tracks_changed: emitted for AppendTracks / RemoveTrack /
Reorder. Owner-scoped. Single kind for all three mutations because
the client invalidation logic is identical (refetch the detail).
Public-playlist subscribers (other users viewing someone else's public
playlist) intentionally left out — needs a separate broadcast kind, not
exercised yet at single-household scale.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
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