(() => {
  const INTERVAL_MS = 5 * 60 * 1000;
  const ENDPOINT = '/api/session/keepalive';

  async function keepSessionAlive() {
    try {
      await fetch(ENDPOINT, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: '{}',
        credentials: 'same-origin',
        cache: 'no-store',
      });
    } catch (error) {
      // A failed keepalive should not interrupt editing or playback.
    }
  }

  keepSessionAlive();
  window.setInterval(keepSessionAlive, INTERVAL_MS);
})();