auctionService.graphql

type User {
    id: ID!
    username: String!
    auctionHistory: [Auction]
}

type Auction {
    id: ID!
    name: String!
    photo: Photo!
    offers: [Bid]
    highestOffer: Bid
}

type Bid {
    user: User!
    amount: Int!
}

type Photo { 
    id: ID!
}

type Query {
    allAuctions: [Auction!]!
}

photoService.graphql

enum Species {
    Dog
    Cat
}

type Pet {
    name: String!
    id: ID!
    species: Species
    breed: String!
    owner: User!
    photos: [Photo!]!
}

type Photo {
    id: ID!
    pet: Pet!
    url: String!
}

type User {
    id: ID!
    favoritePhoto: Photo
    photoGallery: [Photo]
}