{
  "ok": true,
  "cron": "brain-keepalive",
  "ts": "2026-10-28T09:53:39.595Z",
  "brain": {
    "ok": false,
    "error": "fetch failed"
  },
  "backfill": {
    "skipped": true,
    "reason": "no ledger"
  },
  "heartbeat_written": true
}