{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/Attribute",
  "title": "Attribute",
  "type": "object",
  "description": "A user attribute definition used in audience segment rules.",
  "properties": {
    "uid": {
      "type": "string",
      "description": "Unique identifier of the attribute."
    },
    "name": {
      "type": "string",
      "description": "Display name of the attribute."
    },
    "key": {
      "type": "string",
      "description": "Machine-readable key used to reference this attribute in rules and SDKs."
    },
    "data_type": {
      "type": "string",
      "description": "Data type of the attribute.",
      "enum": [
        "string",
        "number",
        "boolean",
        "date"
      ]
    },
    "created_at": {
      "type": "string",
      "format": "date-time",
      "description": "ISO 8601 timestamp when the attribute was created."
    }
  }
}