Register old content triggers.

backend/src/Migrations/OldTriggers/ContentChangedTrigger.cs

@@ -16,7 +16,7 @@ namespace Migrations.OldTriggers;
 [TypeName(nameof(ContentChangedTrigger))]
 public sealed record ContentChangedTrigger : RuleTrigger, IMigrated<RuleTrigger>
 {
-    public ReadonlyList<ContentChangedTriggerSchema> Schemas { get; set; }
+    public ReadonlyList<ContentChangedTriggerSchema>? Schemas { get; set; }
 
     public bool HandleAll { get; set; }
 
@@ -27,7 +27,7 @@ public sealed record ContentChangedTrigger : RuleTrigger, IMigrated<RuleTrigger>
 
     public RuleTrigger Migrate()
     {
-        var schemas = Schemas.Select(x => x.Migrate()).ToReadonlyList();
+        var schemas = Schemas?.Select(x => x.Migrate()).ToReadonlyList();
 
         return new ContentChangedTriggerV2 { HandleAll = HandleAll, Schemas = schemas };
     }

backend/src/Squidex/Config/Domain/RuleServices.cs

@@ -5,8 +5,10 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using Migrations.OldTriggers;
 using Squidex.Domain.Apps.Core.HandleRules;
 using Squidex.Domain.Apps.Core.HandleRules.Extensions;
+using Squidex.Domain.Apps.Core.Rules;
 using Squidex.Domain.Apps.Core.Scripting;
 using Squidex.Domain.Apps.Core.Subscriptions;
 using Squidex.Domain.Apps.Core.Templates;
@@ -78,6 +80,9 @@ public static class RuleServices
         services.AddSingletonAs<EventJsonSchemaGenerator>()
             .AsSelf();
 
+        services.AddSingletonAs(c => new AssemblyTypeProvider<RuleTrigger>(typeof(ContentChangedTrigger).Assembly, "triggerType"))
+            .As<ITypeProvider>();
+
         services.AddSingletonAs<RuleTypeProvider>()
             .As<ITypeProvider>().AsSelf();