Editing a user's username

You can update any user's username using the following GraphQL query:

mutation UpdateUserName($updateUserNameId: Int!, $username: String!) {
  updateUserName(id: $updateUserNameId, username: $username) {
    id, username, fullName
  }
}

which will map

{
  "data": {
    "updateUserName": {
      "id": 2,
      "username": "john_doe",
      "fullName": "John Doe"
    }
  }
}

to the following:

{
  "data": {
    "updateUserName": {
      "id": 2,
      "username": "doe_john",
      "fullName": "John Doe"
    }
  }
}