auctionService.graphql

type User {
    id: ID!
    username: String!
    history: [Bid]
}

type Auction {
    id: ID!
    offers: [Bid]
    highestOffer: Bid
    photoID: ID!
}

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

photoService.graphql

type Animal {
    id: ID!
    species: SPECIES
    breed: String!
}

type Photo {
    id: ID!
    animal: Animal
    url: String!
    auctionID: ID!
}

type Query {
    favoritePhotoForUser(user: ID!): Photo
    photoGalleryForUser(user: ID!): [Photo]
}