{
  "timestamp": "2026-06-27T13:51:23Z",
  "l1_timestamp": "2026-06-27T13:51:13Z",
  "l2_timestamp": "2026-06-27T13:51:18Z",
  "l3_timestamp": "2026-06-27T13:51:19Z",
  "l1_summary": {
    "spelling": {
      "TP": 0,
      "TN": 207,
      "FP": 3,
      "FN": 114,
      "ERR": 0,
      "changed": 3,
      "total": 324,
      "change_rate": 0.0093,
      "pass_rate": 0.6389
    },
    "grammar": {
      "TP": 0,
      "TN": 209,
      "FP": 1,
      "FN": 114,
      "ERR": 0,
      "changed": 1,
      "total": 324,
      "change_rate": 0.0031,
      "pass_rate": 0.6451
    },
    "punctuation": {
      "TP": 0,
      "TN": 210,
      "FP": 0,
      "FN": 114,
      "ERR": 0,
      "changed": 9,
      "total": 324,
      "change_rate": 0.0278,
      "pass_rate": 0.6481
    }
  },
  "l2_summary": {
    "spelling": {
      "TP": 0,
      "TN": 0,
      "FP": 324,
      "FN": 0,
      "pass_rate": 0.0
    },
    "grammar": {
      "TP": 0,
      "TN": 0,
      "FP": 324,
      "FN": 0,
      "pass_rate": 0.0
    },
    "punctuation": {
      "TP": 0,
      "TN": 0,
      "FP": 324,
      "FN": 0,
      "pass_rate": 0.0
    }
  },
  "l3_summary": {
    "TP": 0,
    "TN": 210,
    "FP": 0,
    "FN": 114,
    "pass_rate": 0.6481
  }
}