diff --git a/src/ScadaLink.ConfigurationDatabase/ServiceCollectionExtensions.cs b/src/ScadaLink.ConfigurationDatabase/ServiceCollectionExtensions.cs
index 59e33d8..b13e6dc 100644
--- a/src/ScadaLink.ConfigurationDatabase/ServiceCollectionExtensions.cs
+++ b/src/ScadaLink.ConfigurationDatabase/ServiceCollectionExtensions.cs
@@ -21,7 +21,13 @@ public static class ServiceCollectionExtensions
         services.AddScoped<ISecurityRepository, SecurityRepository>();
         services.AddScoped<ICentralUiRepository, CentralUiRepository>();
         services.AddScoped<ITemplateEngineRepository, TemplateEngineRepository>();
+        services.AddScoped<IDeploymentManagerRepository, DeploymentManagerRepository>();
+        services.AddScoped<ISiteRepository, SiteRepository>();
+        services.AddScoped<IExternalSystemRepository, ExternalSystemRepository>();
+        services.AddScoped<INotificationRepository, NotificationRepository>();
+        services.AddScoped<IInboundApiRepository, InboundApiRepository>();
         services.AddScoped<IAuditService, AuditService>();
+        services.AddScoped<IInstanceLocator, InstanceLocator>();
 
         services.AddDataProtection()
             .PersistKeysToDbContext<ScadaLinkDbContext>();
diff --git a/src/ScadaLink.ExternalSystemGateway/ServiceCollectionExtensions.cs b/src/ScadaLink.ExternalSystemGateway/ServiceCollectionExtensions.cs
index 006d35b..b8528d5 100644
--- a/src/ScadaLink.ExternalSystemGateway/ServiceCollectionExtensions.cs
+++ b/src/ScadaLink.ExternalSystemGateway/ServiceCollectionExtensions.cs
@@ -11,10 +11,10 @@ public static class ServiceCollectionExtensions
             .BindConfiguration("ScadaLink:ExternalSystemGateway");
 
         services.AddHttpClient();
-        services.AddSingleton<ExternalSystemClient>();
-        services.AddSingleton<IExternalSystemClient>(sp => sp.GetRequiredService<ExternalSystemClient>());
-        services.AddSingleton<DatabaseGateway>();
-        services.AddSingleton<IDatabaseGateway>(sp => sp.GetRequiredService<DatabaseGateway>());
+        services.AddScoped<ExternalSystemClient>();
+        services.AddScoped<IExternalSystemClient>(sp => sp.GetRequiredService<ExternalSystemClient>());
+        services.AddScoped<DatabaseGateway>();
+        services.AddScoped<IDatabaseGateway>(sp => sp.GetRequiredService<DatabaseGateway>());
 
         return services;
     }
diff --git a/src/ScadaLink.NotificationService/ServiceCollectionExtensions.cs b/src/ScadaLink.NotificationService/ServiceCollectionExtensions.cs
index e2cdccb..258a3b7 100644
--- a/src/ScadaLink.NotificationService/ServiceCollectionExtensions.cs
+++ b/src/ScadaLink.NotificationService/ServiceCollectionExtensions.cs
@@ -13,8 +13,8 @@ public static class ServiceCollectionExtensions
         services.AddHttpClient();
         services.AddSingleton<OAuth2TokenService>();
         services.AddSingleton<Func<ISmtpClientWrapper>>(_ => () => new MailKitSmtpClientWrapper());
-        services.AddSingleton<NotificationDeliveryService>();
-        services.AddSingleton<INotificationDeliveryService>(sp => sp.GetRequiredService<NotificationDeliveryService>());
+        services.AddScoped<NotificationDeliveryService>();
+        services.AddScoped<INotificationDeliveryService>(sp => sp.GetRequiredService<NotificationDeliveryService>());
 
         return services;
     }
diff --git a/tests/ScadaLink.IntegrationTests/IntegrationSurfaceTests.cs b/tests/ScadaLink.IntegrationTests/IntegrationSurfaceTests.cs
index 928336e..7c3dfb0 100644
--- a/tests/ScadaLink.IntegrationTests/IntegrationSurfaceTests.cs
+++ b/tests/ScadaLink.IntegrationTests/IntegrationSurfaceTests.cs
@@ -200,7 +200,10 @@ public class IntegrationSurfaceTests
         // Create a minimal context — we use Substitute.For<IActorRef> which is fine since
         // we won't exercise Akka functionality in these tests.
         var actorRef = Substitute.For<Akka.Actor.IActorRef>();
-        var sharedLibrary = Substitute.For<SiteRuntime.Scripts.SharedScriptLibrary>(
+        var compilationService = new SiteRuntime.Scripts.ScriptCompilationService(
+            Microsoft.Extensions.Logging.Abstractions.NullLogger<SiteRuntime.Scripts.ScriptCompilationService>.Instance);
+        var sharedLibrary = new SiteRuntime.Scripts.SharedScriptLibrary(
+            compilationService,
             Microsoft.Extensions.Logging.Abstractions.NullLogger<SiteRuntime.Scripts.SharedScriptLibrary>.Instance);
 
         return new SiteRuntime.Scripts.ScriptRuntimeContext(