Hubspot Engagement Calls Property History Structure

{
  "type": "object",
  "description": "Historical value of a property",
  "name": "PropertyHistory",
  "properties": {
    "value": {
      "type": "string",
      "description": "The historical value"
    },
    "timestamp": {
      "type": "datetime",
      "description": "When the value was set"
    },
    "sourceType": {
      "type": "string",
      "description": "The source type that set this value"
    },
    "sourceId": {
      "type": "string",
      "description": "The source identifier"
    },
    "sourceLabel": {
      "type": "string",
      "description": "Human-readable source label"
    },
    "updatedByUserId": {
      "type": "integer",
      "description": "The user ID who made the change"
    }
  },
  "$schema": "https://json-structure.org/draft/2020-12/schema"
}