ModelActor + SwiftData

Using Swift
1

Hello all I have a question with ModelActor, this my model, I have N conversation and we have N User

@Model
class Conversation {
    @Attribute(.unique)
  
    var id: UUID
    var name: String
    var user: User
    var messages: [Message]
    
  init(name: String) {
    self.id = UUID()
    self.name = name
  }
}

@Model
class User {
    @Attribute(.unique)
  
    var id: UUID
    var name: String
    
  init(name: String) {
    self.id = UUID()
    self.name = name
  }
}

and to avoid dataRace I want to use @ModelActor macro

If I understand correctly, this will allow me to serialize my calls in the database.
But should I have one ModelActor or two ModelActor ?

One ModelActor will managed all my insert and get, like this I am sure that all my insert and get are serialized and we have no DataRace

@ModelActor
actor DataBase {
  static let shared = DataBase()
  
  private init?()  {
    guard let modelContainer = try? ModelContainer(for: Conversation.self, User.self) else { return nil }
    self.init(modelContainer:modelContainer)
  }
  
  
  func newUser() {
    modelContext.insert(User(name: "name"))
    try? modelContext.save()
  }
  
  func getUser() {
    let descriptor = FetchDescriptor<User>()
    let value =  try? modelContext.fetch(descriptor)
  }
  
  func newConvesation() {
    
  }
  
  func getAllConversation() {
    
  }
}

But I want to split my code and avoid to have a big DataBase class

There is a way to split my DataBase to UserDataBase and ConversationDataBase, and be sure to be alway serialized ?

I was thinking to have 2 ModelContainer:

let modelContainer = try? ModelContainer(for: Conversation.self)

and

let modelContainer = try? ModelContainer(for: User.self)

in 2 DataBase actor but If I do like this, conversation can keep a reference with user ? I was not sure ?

I don't know what is the best solution here

Or I need to keep all my code in one actor if I want to user ModlActor

Thanks in advance

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