Fixed: Close all database connections on shutdown

src/NzbDrone.Core/Instrumentation/DatabaseTarget.cs

@@ -128,7 +128,7 @@ namespace NzbDrone.Core.Instrumentation
         private void WriteSqliteLog(Log log, string connectionString)
         {
             using (var connection =
-                SQLiteFactory.Instance.CreateConnection())
+                new SQLiteConnection(_connectionStringFactory.LogDbConnectionString).OpenAndReturn())
             {
                 connection.ConnectionString = connectionString;
                 connection.Open();

src/NzbDrone.Host/AppLifetime.cs

@@ -1,3 +1,4 @@
+using System.Data.SQLite;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Hosting;
@@ -6,6 +7,7 @@ using NzbDrone.Common.EnvironmentInfo;
 using NzbDrone.Common.Processes;
 using NzbDrone.Core.Configuration;
 using NzbDrone.Core.Lifecycle;
+using NzbDrone.Core.Messaging;
 using NzbDrone.Core.Messaging.Events;
 
 namespace NzbDrone.Host
@@ -99,6 +101,7 @@ namespace NzbDrone.Host
             return args;
         }
 
+        [EventHandleOrder(EventHandleOrder.Last)]
         public void Handle(ApplicationShutdownRequested message)
         {
             if (!_runtimeInfo.IsWindowsService)

src/NzbDrone.Host/Bootstrap.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Data.SQLite;
 using System.Diagnostics;
 using System.IO;
 using System.Reflection;
@@ -99,6 +100,11 @@ namespace NzbDrone.Host
                 Logger.Info(e.Message);
                 LogManager.Configuration = null;
             }
+
+            // Make sure there are no lingering database connections
+            GC.Collect();
+            GC.WaitForPendingFinalizers();
+            SQLiteConnection.ClearAllPools();
         }
 
         public static IHostBuilder CreateConsoleHostBuilder(string[] args, StartupContext context)