Autofac registrations are not singleton anymore.

NzbDrone.Common/CommonContainerExtentions.cs

@@ -22,12 +22,10 @@ namespace NzbDrone.Common
             }
 
             containerBuilder.RegisterAssemblyTypes(apiAssembly)
-                .AsImplementedInterfaces()
-                .SingleInstance();
+                            .AsImplementedInterfaces();
 
             containerBuilder.RegisterAssemblyTypes(apiAssembly)
-                .AsSelf()
-                .SingleInstance();
+                            .AsSelf();
         }
     }
 }

NzbDrone.Core/ContainerExtensions.cs

@@ -37,15 +37,15 @@ namespace NzbDrone.Core
 
             container.RegisterAssemblyTypes(assembly)
                      .Where(t => t.IsSubclassOf(typeof(IndexerBase)))
-                     .As<IndexerBase>().SingleInstance();
+                     .As<IndexerBase>();
 
             container.RegisterAssemblyTypes(assembly)
                       .Where(t => t.IsSubclassOf(typeof(IndexerSearchBase)))
-                     .As<IndexerSearchBase>().SingleInstance();
+                     .As<IndexerSearchBase>();
 
             container.RegisterAssemblyTypes(assembly)
                       .Where(t => t.IsSubclassOf(typeof(ExternalNotificationBase)))
-                     .As<ExternalNotificationBase>().SingleInstance();
+                     .As<ExternalNotificationBase>();
         }
 
         private static void InitDatabase(this ContainerBuilder container)
@@ -56,7 +56,7 @@ namespace NzbDrone.Core
             var appDataPath = environmentProvider.GetAppDataPath();
             if (!Directory.Exists(appDataPath)) Directory.CreateDirectory(appDataPath);
 
-            container.Register(c => c.Resolve<IDbFactory>().Create(environmentProvider.GetNzbDroneDatabase())).As<IDatabase>().SingleInstance();
+            container.Register(c => c.Resolve<IDbFactory>().Create(environmentProvider.GetNzbDroneDatabase())).As<IDatabase>();
 
             container.RegisterGeneric(typeof(BasicRepository<>)).As(typeof(IBasicRepository<>));
         }

NzbDrone.Core/Datastore/DbFactory.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Data;
 using System.Data.SQLite;
 using Marr.Data;
 using NzbDrone.Core.Datastore.Migration.Framework;
@@ -16,9 +15,13 @@ namespace NzbDrone.Core.Datastore
     {
         private readonly IMigrationController _migrationController;
 
-        public DbFactory(IMigrationController migrationController)
+        static DbFactory()
         {
             TableMapping.Map();
+        }
+
+        public DbFactory(IMigrationController migrationController)
+        {
             _migrationController = migrationController;
         }
 

NzbDrone.Core/Datastore/Migration/Framework/MigrationController.cs

@@ -1,4 +1,6 @@
-using System.Reflection;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Reflection;
 using FluentMigrator.Runner;
 using FluentMigrator.Runner.Initialization;
 using FluentMigrator.Runner.Processors.Sqlite;
@@ -14,6 +16,8 @@ namespace NzbDrone.Core.Datastore.Migration.Framework
     {
         private readonly IAnnouncer _announcer;
 
+        private static readonly HashSet<string> MigrationCache = new HashSet<string>();
+
         public MigrationController(IAnnouncer announcer)
         {
             _announcer = announcer;
@@ -21,6 +25,10 @@ namespace NzbDrone.Core.Datastore.Migration.Framework
 
         public void MigrateToLatest(string connectionString, MigrationType migrationType)
         {
+            lock (MigrationCache)
+            {
+                if (MigrationCache.Contains(connectionString.ToLower())) return;
+
                 var assembly = Assembly.GetExecutingAssembly();
 
                 var migrationContext = new RunnerContext(_announcer)
@@ -34,6 +42,9 @@ namespace NzbDrone.Core.Datastore.Migration.Framework
                 var processor = factory.Create(connectionString, _announcer, options);
                 var runner = new MigrationRunner(assembly, migrationContext, processor);
                 runner.MigrateUp(true);
+
+                MigrationCache.Add(connectionString.ToLower());
+            }
         }
     }
 }

NzbDrone.Update/Program.cs

@@ -1,6 +1,5 @@
 using System;
 using System.IO;
-using System.Linq;
 using Autofac;
 using NLog;
 using NzbDrone.Common;