schema @link(url: "https://specs.apollo.dev/federation/v2.11", import: ["@key"]) {
  query: Query
  mutation: Mutation
}

type Mutation {
  ping: String!
}

type Query {
  _entities(representations: [_Any!]!): [_Entity]!
  _service: _Service!
  me: User!
  allUsers: [User!]!
}

type User @key(fields: "id") {
  id: ID!
  username: String!
  email: String!
}

scalar _Any

union _Entity = User

type _Service {
  sdl: String!
}