{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/Change",
  "title": "Change",
  "type": "object",
  "description": "A single field-level change within a change history record.",
  "required": [
    "change",
    "type"
  ],
  "properties": {
    "change": {
      "type": "string",
      "description": "The name of the update action that caused this change (e.g., 'setCustomField', 'changeOrderState')."
    },
    "type": {
      "type": "string",
      "description": "The type identifier of this change entry."
    },
    "previousValue": {
      "description": "The field value before the change was applied."
    },
    "nextValue": {
      "description": "The field value after the change was applied."
    }
  }
}