music: near-realtime now playing (currently-playing every 5 s while playing, 30 s idle backoff, Retry-After, recent plays ~10 s after a track change, holder-based lease) and a public SSE stream /api/listening/stream feeding the listening card live with client-side progress

src/lib/server/db/schema/music.ts

@@ -164,6 +164,7 @@ export const musicSpotifyAuth = musicSchema.table(
 		recentCursor: bigint('recent_cursor', { mode: 'number' }),
 		needsReauth: boolean('needs_reauth').notNull().default(false),
 		leaseUntil: timestamptz('lease_until'),
+		leaseHolder: text('lease_holder'),
 		lastPollAt: timestamptz('last_poll_at'),
 		lastError: text('last_error'),
 		connectedAt: timestamptz('connected_at').notNull().defaultNow(),