Playlist files: export with metadata and YouTube links (all or one playlist), import v1/v2 with duplicate handling, and ask the server to download the imported videos

server/server.js

@@ -1657,6 +1657,28 @@ registerMediaMetaRoutes(app, { db: notesDb, catalog: videoCatalog, media });
 
 // POST /api/media/:id/redownload — the client's "Broken" button. Idempotent:
 // a job already queued/running for this id is just reported back.
+// POST /api/media/prefetch  { ids: [...] } — queue server copies of many videos
+// (e.g. an imported playlist) at background priority. Already-ready ids are
+// reported, not refetched; the usual duration/disk limits still apply.
+const prefetchHits = new Map(); // ip → timestamps
+app.post('/api/media/prefetch', async (c) => {
+  let body; try { body = await c.req.json(); } catch { return c.json({ ok: false, error: 'invalid JSON' }, 400); }
+  const ip = clientIpOf(c.req.raw, null) || 'local';
+  const t = Date.now(), recent = (prefetchHits.get(ip) || []).filter((x) => t - x < 10 * 60_000);
+  if (recent.length >= 10) return c.json({ ok: false, error: 'too many download requests — try again in a few minutes' }, 429);
+  recent.push(t); prefetchHits.set(ip, recent); if (prefetchHits.size > 5000) prefetchHits.clear();
+  const ids = [...new Set((Array.isArray(body?.ids) ? body.ids : []).map(String).filter((id) => media.isMediaId(id) && !id.startsWith('upl_')))].slice(0, 500);
+  if (!ids.length) return c.json({ ok: false, error: 'no YouTube video ids in the request' }, 400);
+  let ready = 0, queued = 0;
+  for (const id of ids) {
+    if (await media.getReady(id).catch(() => null)) { ready++; continue; }
+    queued++;
+    media.ensureCached(id, { priority: LOW, auto: true }).catch(() => {});
+  }
+  serverCopies.at = 0; // the On server badges refresh on the next search
+  return c.json({ ok: true, requested: ids.length, ready, queued });
+});
+
 app.post('/api/media/:id/redownload', async (c) => {
   try {
     return c.json({ ok: true, ...(await media.redownload(c.req.param('id'))) });