query MyEmailSignature {
  myEmailSignature {
    text
    markdown
    createdAt {
      unixTimestamp
      iso8601
    }
    createdBy {
      __typename
      ... on UserActor {
        userId
        user {
          __typename
        }
      }
    }
    updatedAt {
      unixTimestamp
      iso8601
    }
    updatedBy {
      __typename
      ... on UserActor {
        userId
        user {
          __typename
        }
      }
    }
  }
}

{
  "data": {
    "myEmailSignature": {
      "text": "string",
      "markdown": "string",
      "createdAt": {
        "unixTimestamp": "string",
        "iso8601": "string"
      },
      "createdBy": {
        "__typename": "UserActor",
        "userId": "id",
        "user": {
          "__typename": "User"
        }
      },
      "updatedAt": {
        "unixTimestamp": "string",
        "iso8601": "string"
      },
      "updatedBy": {
        "__typename": "UserActor",
        "userId": "id",
        "user": {
          "__typename": "User"
        }
      }
    }
  }
}