Update metadata on download finish

db/schema.sql

@@ -62,3 +62,23 @@ CREATE INDEX parsed_torrents_state_idx
 CREATE UNIQUE INDEX parsed_torrents_info_hash_uidx
     ON parsed_torrents (info_hash)
     WHERE info_hash != '';
+
+-- Albums that music-agregator has pointed tora at. One row per
+-- (album_id, quality) pair: a re-monitor of the same album at the same
+-- quality is rejected by the UNIQUE constraint until the previous row is
+-- removed. The `torrent_id` column links back to tora's torrent; it's what
+-- the startup notification subscriber uses to look up which album a
+-- STATE_CHANGED -> FINISHED event belongs to.
+CREATE TABLE monitored_albums (
+    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    album_id      TEXT NOT NULL,
+    torrent_id    UUID NOT NULL,
+    quality       TEXT NOT NULL,
+    created_at    TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at    TIMESTAMPTZ NOT NULL DEFAULT now(),
+    completed_at  TIMESTAMPTZ,
+    UNIQUE (album_id, quality)
+);
+
+CREATE UNIQUE INDEX monitored_albums_torrent_id_uidx
+    ON monitored_albums (torrent_id);