interface Node {
  id: ID!
}

interface Timestamped implements Node {
  id: ID!
  createdAt: String!
  updatedAt: String!
}

type User implements Timestamped {
  id: ID!
  createdAt: String!
  updatedAt: String!
  username: String!
  email: String!
}

extend type Query {
  user(id: ID!): User
}