Correct handling of old events.

src/Squidex.Domain.Apps.Events/Schemas/Old/WebhookAdded.cs

@@ -13,17 +13,12 @@ namespace Squidex.Domain.Apps.Events.Schemas.Old
 {
     [EventType(nameof(WebhookAdded))]
     [Obsolete]
-    public sealed class WebhookAdded : SchemaEvent, IMigratedEvent
+    public sealed class WebhookAdded : SchemaEvent
     {
         public Guid Id { get; set; }
 
         public Uri Url { get; set; }
 
         public string SharedSecret { get; set; }
-
-        public IEvent Migrate()
-        {
-            return new NoopEvent();
-        }
     }
 }

src/Squidex.Domain.Apps.Events/Schemas/Old/WebhookDeleted.cs

@@ -13,13 +13,8 @@ namespace Squidex.Domain.Apps.Events.Schemas.Old
 {
     [EventType(nameof(WebhookDeleted))]
     [Obsolete]
-    public sealed class WebhookDeleted : SchemaEvent, IMigratedEvent
+    public sealed class WebhookDeleted : SchemaEvent
     {
         public Guid Id { get; set; }
-
-        public IEvent Migrate()
-        {
-            return new NoopEvent();
-        }
     }
 }

src/Squidex.Domain.Apps.Read.MongoDb/Schemas/MongoSchemaRepository_EventHandling.cs

@@ -16,6 +16,7 @@ using Squidex.Domain.Apps.Read.MongoDb.Utils;
 using Squidex.Infrastructure.CQRS.Events;
 using Squidex.Infrastructure.Dispatching;
 using Squidex.Infrastructure.Reflection;
+using Squidex.Domain.Apps.Events.Schemas.Old;
 
 namespace Squidex.Domain.Apps.Read.MongoDb.Schemas
 {
@@ -127,5 +128,17 @@ namespace Squidex.Domain.Apps.Read.MongoDb.Schemas
         {
             entity.SerializeSchema(schema, serializer);
         }
+
+#pragma warning disable CS0612 // Type or member is obsolete
+        protected Task On(WebhookAdded @event, EnvelopeHeaders headers)
+        {
+            return Collection.UpdateAsync(@event, headers, e => { });
+        }
+
+        protected Task On(WebhookDeleted @event, EnvelopeHeaders headers)
+        {
+            return Collection.UpdateAsync(@event, headers, e => { });
+        }
+#pragma warning restore CS0612 // Type or member is obsolete
     }
 }