Collect discovered video metadata and recommend videos from listening history

server/db.js

@@ -134,6 +134,29 @@ export async function initDb() {
     );
     CREATE INDEX IF NOT EXISTS idx_video_meta_upd ON video_meta (updated_at);
 
+    CREATE TABLE IF NOT EXISTS video_meta_sources (
+      video_id TEXT NOT NULL, source TEXT NOT NULL, discoveries INTEGER NOT NULL DEFAULT 1,
+      last_seen INTEGER NOT NULL, PRIMARY KEY (video_id, source)
+    );
+    CREATE TABLE IF NOT EXISTS video_thumbnails (
+      video_id TEXT PRIMARY KEY, url TEXT NOT NULL, data BLOB, mime TEXT,
+      size INTEGER NOT NULL DEFAULT 0, fetched_at INTEGER NOT NULL DEFAULT 0,
+      retry_at INTEGER NOT NULL DEFAULT 0, attempts INTEGER NOT NULL DEFAULT 0
+    );
+    CREATE INDEX IF NOT EXISTS idx_thumb_pending ON video_thumbnails (retry_at) WHERE data IS NULL;
+    CREATE TABLE IF NOT EXISTS listening_daily (
+      fingerprint TEXT NOT NULL, day TEXT NOT NULL, video_id TEXT NOT NULL,
+      plays INTEGER NOT NULL, PRIMARY KEY (fingerprint, day, video_id)
+    );
+    CREATE INDEX IF NOT EXISTS idx_listening_video ON listening_daily (video_id, day);
+    CREATE TABLE IF NOT EXISTS catalog_backfill (
+      source TEXT PRIMARY KEY, cursor INTEGER NOT NULL DEFAULT 0, ceiling INTEGER NOT NULL
+    );
+    CREATE TABLE IF NOT EXISTS video_channels (
+      video_id TEXT PRIMARY KEY, channel TEXT NOT NULL, updated_at INTEGER NOT NULL DEFAULT 0
+    );
+    CREATE INDEX IF NOT EXISTS idx_video_channel ON video_channels (channel,updated_at DESC,video_id);
+
     -- Shared per-video documents (kind = lyrics | chapters), visible to every
     -- user. The live copy is here; every save also lands in video_note_revs
     -- as a full snapshot, which is the server-side backup and undo history.