Sessions: Sidebar, Session-Wechsel, Archivieren-Button, alles session-bezogen

Models/ArchiveRecord.cs

@@ -4,6 +4,7 @@ public class ArchiveRecord
 {
     public long Id { get; set; }
     public string ArchiveId { get; set; }
+    public string SessionId { get; set; }
     public string Name { get; set; }
     public int ChainCount { get; set; }
     public int MessageCount { get; set; }