{
  "date": "2026-03-25",
  "source_cache": "/Users/lutherbot/.openclaw/workspace/data/cbbo_spread_cache/spread_cache_2026-03-25.parquet",
  "source_trades": "/Users/lutherbot/.openclaw/workspace/data/spxw_trades/spxw_trades_2026-03-25.dbn.zst",
  "n_rows": 23397,
  "base_cluster_count": 15,
  "graded_high_count": 3,
  "graded_medium_count": 6,
  "graded_high_med_count": 9,
  "first_ts": 1774445403,
  "last_ts": 1774468799
}