type User {
    id: ID! @id
    uid: String! @unique
    createdAt: DateTime @createdAt
    name: String
    email: String @unique
    gender: String
    trips: [Trip] @relation(name: "TravelerRelation")
    createdTrips: [Trip] @relation(name: "TripOwner" onDelete: CASCADE)
}

type Trip {
    id: ID! @id
    createdAt: DateTime @createdAt
    invitationLink: String @unique
    name: String!
    location: String
    arivalDay: DateTime
    departureDay: DateTime
    user: User! @relation(name: "TripOwner")
    travelers: [User!] @relation(name: "TravelerRelation")
    activities: [Activity]
    packingLists: [PackingList!] @relation(onDelete: CASCADE)
}