所有 8 条记录均为业务查询（`SELECT`），无事务控制语句（COMMIT/BEGIN/ROLLBACK 等），按 `exec_count` 降序取前 3，精确到小数点后 3 位：

- `992377525…` exec_count=90，avg_query_time≈0.41354s
- `bda1f10c…` exec_count=66，avg_query_time≈0.71446s
- `d94be824…` exec_count=15，avg_query_time≈0.44922s

```json
{
  "cluster_id": "10748116073341772391",
  "window": {
    "start": "2026-07-21T03:00:00Z",
    "end": "2026-07-21T03:05:00Z"
  },
  "evidence_sufficient": true,
  "slow_queries": [
    {
      "digest": "992377525bc78cf77741e870a6a509f866749e322c5baf19d55703fc26970577",
      "exec_count": 90,
      "avg_time_s": 0.414
    },
    {
      "digest": "bda1f10c99c3bfba07501f9579aeedaff16fcde326a3e99d75dd75adfd880ca6",
      "exec_count": 66,
      "avg_time_s": 0.714
    },
    {
      "digest": "d94be824b6c9bd25dd280afec2e0dda0e5b6b8f38d0f912d085a02f137f3130a",
      "exec_count": 15,
      "avg_time_s": 0.449
    }
  ]
}
```