从返回的 20 条记录中，过滤掉事务控制语句（`COMMIT` — digest `9505cacb...`、`START TRANSACTION` — digest `9a4170a0...`），剩余业务查询按 `exec_count` 降序排列，取前 3：

1. `2d142ccf...` — exec_count 404，avg 2.549 s
2. `7d75919b...` — exec_count 95，avg 1.553 s
3. `4afa34fa...` — exec_count 71，avg 1.290 s

```json
{
  "cluster_id": "10989049060142230334",
  "window": {
    "start": "2026-07-21T03:00:00Z",
    "end": "2026-07-21T03:05:00Z"
  },
  "evidence_sufficient": true,
  "slow_queries": [
    {
      "digest": "2d142ccf344650a9226ea89d072cdae8eeb850fff82d96e8bf0406cdf52ee69f",
      "exec_count": 404,
      "avg_time_s": 2.549
    },
    {
      "digest": "7d75919b6fcc6bbbc8516539ac4a165887c4a9765b9e986314ef43ab77267874",
      "exec_count": 95,
      "avg_time_s": 1.553
    },
    {
      "digest": "4afa34fab28500dd78a9d5a531dcf93b2c8f36f525d970c99028638c243f2c3b",
      "exec_count": 71,
      "avg_time_s": 1.290
    }
  ]
}
```