update db queries

MediaBrowser.Server.Startup.Common/Migrations/DbMigration.cs

@@ -0,0 +1,34 @@
+using System.Threading.Tasks;
+using MediaBrowser.Common.ScheduledTasks;
+using MediaBrowser.Controller.Configuration;
+using MediaBrowser.Server.Implementations.Persistence;
+
+namespace MediaBrowser.Server.Startup.Common.Migrations
+{
+    public class DbMigration : IVersionMigration
+    {
+        private readonly IServerConfigurationManager _config;
+        private readonly ITaskManager _taskManager;
+
+        public DbMigration(IServerConfigurationManager config, ITaskManager taskManager)
+        {
+            _config = config;
+            _taskManager = taskManager;
+        }
+
+        public void Run()
+        {
+            if (_config.Configuration.MigrationVersion < CleanDatabaseScheduledTask.MigrationVersion)
+            {
+                return;
+            }
+
+            Task.Run(async () =>
+            {
+                await Task.Delay(2000).ConfigureAwait(false);
+
+                _taskManager.QueueScheduledTask<CleanDatabaseScheduledTask>();
+            });
+        }
+    }
+}