json_schema: {
      "additionalProperties": true,
      "description": "Schema for Segment alias event (via webhook), https://segment.com/docs/integrations/webhooks/#alias",
      "properties": {
          "from": {
              "type": "string"
          },
          "to": {
              "type": "string"
          }
      },
      "self": {
          "format": "jsonschema",
          "name": "alias",
          "vendor": "com.segment",
          "version": "1-0-0"
      },
      "type": "object"
  }