type Room @model {
  id: ID!
  createdAt: String
  updatedAt: String
  messages: [Message] @connection(name: "RoomMessages", keyField: "roomId", sortField: "when")
}

type Message @model {
  id: ID!
  content: String!
  when: String!
  roomId: ID
  room: Room @connection(name: "RoomMessages", keyField: "roomId")
}