refactor(backend): simplify media schema and recording metadata

Backend/routes/recordings.ts

@@ -180,13 +180,6 @@ router.get('/:recordingId/download-url', requireDeviceAuth, async (req, res) =>
     return;
   }
 
-  const canAccess = recording.requesterDeviceId === deviceAuth.deviceId || recording.cameraDeviceId === deviceAuth.deviceId;
-
-  if (!canAccess) {
-    res.status(403).json({ message: 'Device cannot access this recording' });
-    return;
-  }
-
   if (recording.status !== 'ready' || !recording.objectKey || !recording.bucket) {
     res.status(409).json({ message: 'Recording is not available yet' });
     return;
@@ -228,7 +221,6 @@ router.get('/:recordingId/download-url', requireDeviceAuth, async (req, res) =>
   });
 });
 
-// Internal helper used by stream lifecycle to create recording placeholder rows.
 export const createRecordingForStream = async (streamSessionId: string): Promise<void> => {
   const stream = await db.query.streamSessions.findFirst({ where: eq(streamSessions.id, streamSessionId) });