diff --git a/csharp/App/Backend/Database/Db.cs b/csharp/App/Backend/Database/Db.cs
index e9cb827ca..d9d5ae1cd 100644
--- a/csharp/App/Backend/Database/Db.cs
+++ b/csharp/App/Backend/Database/Db.cs
@@ -16,20 +16,21 @@ public static partial class Db
 
     private static SQLiteConnection Connection { get; } = new SQLiteConnection(DbPath);
 
-    public static TableQuery<Session>                   Sessions                    => Connection.Table<Session>();
-    public static TableQuery<Folder>                    Folders                     => Connection.Table<Folder>();
-    public static TableQuery<DeletedFolder>             DeletedFolders              => Connection.Table<DeletedFolder>();
-    public static TableQuery<Installation>              Installations               => Connection.Table<Installation>();
-    public static TableQuery<DeletedInstallation>       DeletedInstallations        => Connection.Table<DeletedInstallation>();
-    public static TableQuery<User>                      Users                       => Connection.Table<User>();
-    public static TableQuery<DeletedUser>               DeletedUsers                => Connection.Table<DeletedUser>();
-    public static TableQuery<FolderAccess>              FolderAccess                => Connection.Table<FolderAccess>();
-    public static TableQuery<InstallationAccess>        InstallationAccess          => Connection.Table<InstallationAccess>();
-    public static TableQuery<OrderNumber2Installation>  OrderNumber2Installation    => Connection.Table<OrderNumber2Installation>();
-
+    public static TableQuery<Session>                   Sessions                 => Connection.Table<Session>();
+    public static TableQuery<Folder>                    Folders                  => Connection.Table<Folder>();
+    public static TableQuery<Installation>              Installations            => Connection.Table<Installation>();
+    public static TableQuery<User>                      Users                    => Connection.Table<User>();
+    public static TableQuery<FolderAccess>              FolderAccess             => Connection.Table<FolderAccess>();
+    public static TableQuery<InstallationAccess>        InstallationAccess       => Connection.Table<InstallationAccess>();
+    public static TableQuery<OrderNumber2Installation>  OrderNumber2Installation => Connection.Table<OrderNumber2Installation>();
+    
+    public static TableQuery<DeletedInstallation>       DeletedInstallations     => Connection.Table<DeletedInstallation>();
+    public static TableQuery<DeletedUser>               DeletedUsers             => Connection.Table<DeletedUser>();
+    public static TableQuery<DeletedFolder>             DeletedFolders           => Connection.Table<DeletedFolder>();
 
     public static void Init()
     {
+        // used to force static constructor
     }
     
 
@@ -54,6 +55,7 @@ public static partial class Db
         Observable.Interval(TimeSpan.FromDays(0.5))
                   .StartWith(0)         // Do it right away (on startup)      
                   .ObserveOn(TaskPoolScheduler.Default)
+                  .SubscribeOn(TaskPoolScheduler.Default)
                   .SelectMany(Cleanup)
                   .Subscribe();
     }