我相信你可以通过a/query命令opentsdb删除查询到的数据。
根据opentsdb最新文档：

delete  Boolean Optional    Can be passed to the JSON with a POST to delete any data points that match the given query. false       W   true

为此，可以：
查询但使用动词
DELETE POST 在json主体中使用delete=true
示例

{
    "start": 1356998400,
    "end": 1356998460,
    "delete": true,
    "queries": [
        {
            "aggregator": "sum",
            "metric": "sys.cpu.0",
            "rate": "true",
            "tags": {
                "host": "*",
                "dc": "lga"
            }
        },
    ]
}

参考文献：http://opentsdb.net/docs/build/html/api_http/query/index.html