Timeline adoption runs once per stream, not per row (it hit the 15 s timeout on every run) (#325)

ddiff --git a/server/db/database.js b/server/db/database.js
iindex 5027f712..89b5cb5b 100644
---- a/server/db/database.js
++++ b/server/db/database.js
@@@ -79,16 +79,21 @@ async function bootRecovery() {
   * already points at a VOD, the stream's remaining rows belong to that same VOD by construction (one recording per
   * stream). The partial index idx_timeline_null_vod makes "is there anything to adopt?" cheap, so the common case
   * skips the update entirely.
++ *
++ * One pass per stream, not per row: the streams with NULL rows (that index), the VOD each already names, then one
++ * join. The per-row form ran two subqueries over the row's whole stream for every NULL row, quadratic in a stream's
++ * length, and with 32,105 NULL rows over 41 streams (most never recorded, so never adopted) it hit the 15 s
++ * statement timeout on every run (44 times in the PostgreSQL log on 2026-10-23).
   */
  async function adoptOrphanedTimelineRows() {
      const pending = await get('SELECT 1 AS x FROM stream_timeline_events WHERE vod_id IS NULL LIMIT 1');
      if (!pending) return 0;
--    const res = await run(`UPDATE stream_timeline_events AS t
--        SET vod_id = (SELECT s.vod_id FROM stream_timeline_events s
--                      WHERE s.stream_id = t.stream_id AND s.vod_id IS NOT NULL LIMIT 1)
--        WHERE t.vod_id IS NULL
--          AND EXISTS (SELECT 1 FROM stream_timeline_events s
--                      WHERE s.stream_id = t.stream_id AND s.vod_id IS NOT NULL)`);
++    const res = await run(`UPDATE stream_timeline_events AS t SET vod_id = v.vod_id
++        FROM (SELECT s.stream_id, MIN(s.vod_id) AS vod_id FROM stream_timeline_events s
++              WHERE s.vod_id IS NOT NULL
++                AND s.stream_id IN (SELECT DISTINCT n.stream_id FROM stream_timeline_events n WHERE n.vod_id IS NULL)
++              GROUP BY s.stream_id) v
++        WHERE t.stream_id = v.stream_id AND t.vod_id IS NULL`);
      if (res.changes) console.log(`[DB] stream_timeline_events: adopted ${res.changes} orphaned row(s) onto their VOD`);
      return res.changes;
  }