{
  "$schema": "https://json-structure.org/draft/2020-12/schema",
  "name": "ContactEventUpdateDto",
  "type": "object",
  "properties": {
    "fieldName": {
      "type": "string"
    },
    "oldValue": {
      "type": "string"
    },
    "newValue": {
      "type": "string"
    }
  }
}