Timezone data is missing in export from CAWS

[bardram]

When exporting data from CAWS the timezone information is missing in the json data. A timezone measurement looks like this from CAWS:

  {
    "sequenceId": 1,
    "studyDeploymentId": "15c12adb-b6ce-408f-99a0-f54c944416d9",
    "deviceRoleName": "Primary Phone",
    "measurement": {
      "sensorStartTime": 1737381487894357,
      "data": {
        "__type": "dk.cachet.carp.timezone"
      }
    },
  ...
  },

But when uploaded, it looks like this:

{
  "sensorStartTime": 1737381487894357,
  "data": {
    "__type": "dk.cachet.carp.timezone",
    "timezone": "Europe/Copenhagen"
  }
}

Hence the timezone part is missing (note that this is the same measurement, based on the timestamp).