SwiftData integration for coexistence with CoreData Error: Persistent truncated

When integrating SwiftData for an already existing app that uses CoreData as data management, I encounter errors.

When building the ModelContainer for the first time, the following error appears:

Error: Persistent History (184) has to be truncated due to the following entities being removed (all Entities except for the 2 where I defined a SwiftData Model)

class SwiftDataManager: ObservableObject {
    static let shared = SwiftDataManager()
    private let persistenceManager = PersistenceManager.shared
    private init(){}

    lazy var modelContainer: ModelContainer = {
        do {
            let storeUrl = persistenceManager.storeURL()
            let schema = Schema([
                HistoryIncident.self,
                HistoryEvent.self
            ])
            let modelConfig = ModelConfiguration(url: storeUrl)
            return try ModelContainer(for: schema, configurations: [modelConfig])
        } catch {
            fatalError("Could not create ModelContainer: \(error)")
        }
    }()

}

@Model public class HistoryIncident {
    var missionNr: String?
    @Relationship(deleteRule: .cascade) var events: [HistoryEvent]?
    
    public init(){}
}

@Model class HistoryEvent {
    var decs: String?
    var timestamp: Date?

    
    init(){}
}

As soon as I call the following function.

    func addMockEventsToCurrentHistorie() {
        var descriptor = FetchDescriptor<HistoryIncident>()
        let key =  self.hKey ?? ""
        descriptor.predicate = #Predicate { mE in
            key == mE.key
        }
        
        let historyIncident = try? SwiftDataManager.shared.modelContext.fetch(descriptor).first
        guard var events = historyIncident?.events else {return}
        events.append(contentsOf: createEvents())
    }

I get the error:

CoreData: error: (1) I/O error for database at /var/mobile/Containers/Data/Application/55E9D59D-48C4-4D86-8D9F-8F9CA019042D/Library/ Private Documents/appDatabase.sqlite. SQLite error code:1, 'no such column: t0.Z1EVENTS'

/var/mobile/Containers/Data/Application/55E9D59D-48C4-4D86-8D9F-8F9CA019042D/Library/ Private Documents/appDatabase.sqlite. SQLite error code:1, 'no such column: t0.Z1EVENTS' with userInfo of { NSFilePath = "/var/mobile/Containers/Data/Application/55E9D59D-48C4-4D86-8D9F-8F9CA019042D/Library/ Private Documents/appDatabase.sqlite"; NSSQLiteErrorDomain = 1; }