[
  {
    "expression": "ts_zscore(close, 20) / ts_std(close, 20)",
    "time_consuming": 6.54,
    "status": "error",
    "timestamp": "2025-11-25 10:06:20",
    "message": "Attempted to use inaccessible or unknown operator \"ts_std\""
  },
  {
    "expression": "ts_corr(volume, close, 10) * ts_std(close, 5)",
    "time_consuming": 6.5,
    "status": "error",
    "timestamp": "2025-11-25 10:08:00",
    "message": "Attempted to use inaccessible or unknown operator \"ts_std\""
  },
  {
    "expression": "group_zscore(ts_max(high, 20) - close, market_cap)",
    "time_consuming": 25.63,
    "status": "error",
    "timestamp": "2025-11-25 10:09:46",
    "message": "Attempted to use inaccessible or unknown operator \"ts_max\""
  },
  {
    "expression": "ts_min(low, 5) / ts_max(high, 5) - 1",
    "time_consuming": 6.57,
    "status": "error",
    "timestamp": "2025-11-25 10:11:17",
    "message": "Attempted to use inaccessible or unknown operator \"ts_min\""
  },
  {
    "expression": "group_rank(ts_std(close, 10), sector) * ts_mean(volume, 5)",
    "time_consuming": 18.7,
    "status": "error",
    "timestamp": "2025-11-25 10:11:36",
    "message": "Attempted to use inaccessible or unknown operator \"ts_std\""
  },
  {
    "expression": "ts_slope(close, 15) * ts_std(volume, 5)",
    "time_consuming": 6.51,
    "status": "error",
    "timestamp": "2025-11-25 10:13:07",
    "message": "Attempted to use inaccessible or unknown operator \"ts_slope\""
  },
  {
    "expression": "group_zscore(ts_max(high, 10) - ts_min(low, 10), country)",
    "time_consuming": 6.51,
    "status": "error",
    "timestamp": "2025-11-25 10:13:14",
    "message": "Attempted to use inaccessible or unknown operator \"ts_max\""
  },
  {
    "expression": "group_rank(ts_zscore(close, 10), market_cap)",
    "time_consuming": 6.67,
    "status": "error",
    "timestamp": "2025-11-25 10:17:02",
    "message": "Attempted to use unknown variable \"market_cap\""
  },
  {
    "expression": "ts_max(high, 10) / ts_min(low, 10) - 1",
    "time_consuming": 6.68,
    "status": "error",
    "timestamp": "2025-11-25 10:23:01",
    "message": "Attempted to use inaccessible or unknown operator \"ts_max\""
  }
]