message: [mempool] fix dashboard time range
  Closes:
  Approved by: sunmilee
diff: "list": []
  },
  "time": {
  - "from": "2020-07-21T02:44:11.000Z",
  - "to": "2020-07-21T02:51:08.000Z"
  + "from": "now-3h",
  + "to": "now"
  },
  "timepicker": {
  "refresh_intervals": [
  