[DB] Update migrations for datetime update

Manager.App/Services/System/SystemService.cs

@@ -0,0 +1,12 @@
+namespace Manager.App.Services.System;
+
+public class SystemService : BackgroundService
+{
+    private CancellationToken _cancellationToken { get; set; }
+    
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        _cancellationToken = stoppingToken;
+    }
+    
+}