Initial

LehrerApp.Sync/Models/SyncModels.cs

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+namespace LehrerApp.Sync.Models;
+
+/// <summary>
+/// Ein einzelnes Ereignis im Event-Log.
+/// Wird verschlüsselt zum Server übertragen – der Server versteht den Payload nicht.
+/// </summary>
+public class SyncEvent
+{
+    public Guid EventId { get; init; } = Guid.NewGuid();
+    public string DeviceId { get; init; } = "";
+    public DeviceType DeviceType { get; init; }
+    public DateTime Timestamp { get; init; } = DateTime.UtcNow;
+    public long SequenceNr { get; init; }           // monoton steigend pro Gerät
+    public string EntityType { get; init; } = "";   // "Student", "Exam", "Grade" ...
+    public string EntityId { get; init; } = "";
+    public string Operation { get; init; } = "";    // "Create", "Update", "Delete"
+    public string Payload { get; init; } = "";      // JSON, AES-256 verschlüsselt
+}
+
+/// <summary>
+/// Eintrag im lokalen Konflikt-Log – für UI-Anzeige.
+/// </summary>
+public class ConflictEntry
+{
+    public Guid Id { get; init; } = Guid.NewGuid();
+    public DateTime DetectedAt { get; init; } = DateTime.UtcNow;
+    public SyncEvent LocalEvent { get; init; } = null!;
+    public SyncEvent RemoteEvent { get; init; } = null!;
+    public string Resolution { get; init; } = "";   // "LocalWon", "RemoteWon", "Pending"
+    public bool Reviewed { get; set; }
+}
+
+/// <summary>
+/// Antwort des Servers auf einen Pull-Request.
+/// </summary>
+public class PullResponse
+{
+    public List<SyncEvent> Events { get; init; } = [];
+    public long ServerSequenceNr { get; init; }
+}
+
+/// <summary>
+/// Antwort des Servers auf einen Push-Request.
+/// </summary>
+public class PushResponse
+{
+    public bool Success { get; init; }
+    public long ServerSequenceNr { get; init; }
+    public List<Guid> ConflictingEventIds { get; init; } = [];
+}
+
+public enum DeviceType { Desktop, Companion }
+
+/// <summary>
+/// Sync-Status für UI-Anzeige.
+/// </summary>
+public class SyncStatus
+{
+    public SyncState State { get; set; } = SyncState.Idle;
+    public DateTime? LastSyncAt { get; set; }
+    public int PendingEvents { get; set; }
+    public int ConflictCount { get; set; }
+    public string? ErrorMessage { get; set; }
+}
+
+public enum SyncState { Idle, Syncing, Error, Offline }