curl -X PATCH "https://api.rxscale.com/v1/management/questionnaires/{questionnaire_uid}/model" \
  -H "X-API-Key: ihr-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": {
      "title": "Medizinischer Fragebogen",
      "pages": [
        {
          "name": "allgemein",
          "elements": [
            {
              "type": "text",
              "name": "symptome",
              "title": "Bitte beschreiben Sie Ihre Symptome"
            }
          ]
        }
      ]
    },
    "theme": {
      "themeName": "contrast"
    }
  }'

{
  "uid": "9b5b7e7f-7159-4bd4-9e8c-b95a2b39b33f",
  "model": {
    "title": "Medizinischer Fragebogen",
    "pages": [
      {
        "name": "allgemein",
        "elements": [
          {
            "type": "text",
            "name": "symptome",
            "title": "Bitte beschreiben Sie Ihre Symptome"
          }
        ]
      }
    ]
  },
  "theme": {
    "themeName": "contrast"
  }
}