[
  {
    "expression": "-ts_argmax(high, 20) * ts_rank(close, 10)",
    "time_consuming": 6.49,
    "status": "error",
    "timestamp": "2025-11-25 10:36:11",
    "message": "Attempted to use inaccessible or unknown operator \"ts_argmax\""
  },
  {
    "expression": "ts_mean((close - open) / (high - low + 1e-6), 10)",
    "time_consuming": 2.37,
    "status": "error",
    "timestamp": "2025-11-25 10:36:13",
    "message": "Unexpected character 'e' near \"- low + 1e-6), 10)\""
  },
  {
    "expression": "-ts_zscore(ts_mean(volume, 20), country)",
    "time_consuming": 6.55,
    "status": "error",
    "timestamp": "2025-11-25 10:40:41",
    "message": "Got invalid value for attribute \"lookback\", must be constant or string"
  },
  {
    "expression": "(close - ts_min(low, 10)) / (ts_max(high, 10) - ts_min(low, 10) + 1e-6)",
    "time_consuming": 6.49,
    "status": "error",
    "timestamp": "2025-11-25 10:40:48",
    "message": "Unexpected character 'e' near \"w, 10) + 1e-6)\""
  },
  {
    "expression": "group_rank(ts_corr(close, ts_delay(close, 5), 60), sector)",
    "time_consuming": 66.39,
    "status": "error",
    "message": "The read operation timed out",
    "timestamp": "2025-11-25 10:43:13"
  },
  {
    "expression": "-ts_product(ts_rank(close, 10), ts_rank(volume, 10))",
    "time_consuming": 7.27,
    "status": "error",
    "timestamp": "2025-11-25 10:43:20",
    "message": "Got invalid value for attribute \"lookback\", must be constant or string"
  },
  {
    "expression": "group_zscore(ts_argmin(low, 20), sector) * -1",
    "time_consuming": 6.86,
    "status": "error",
    "timestamp": "2025-11-25 10:46:54",
    "message": "Attempted to use inaccessible or unknown operator \"ts_argmin\""
  }
]