diff --git a/backend/src/Squidex.Domain.Apps.Core.Operations/HandleRules/RuleTypeProvider.cs b/backend/src/Squidex.Domain.Apps.Core.Operations/HandleRules/RuleTypeProvider.cs
index a8b2b09b2..db8592306 100644
--- a/backend/src/Squidex.Domain.Apps.Core.Operations/HandleRules/RuleTypeProvider.cs
+++ b/backend/src/Squidex.Domain.Apps.Core.Operations/HandleRules/RuleTypeProvider.cs
@@ -38,18 +38,18 @@ public sealed class RuleTypeProvider : ITypeProvider
         }
     }
 
-    public void Add<T>() where T : RuleAction
+    public RuleTypeProvider Add<T>() where T : RuleAction
     {
-        Add(typeof(T));
+        return Add(typeof(T));
     }
 
-    private void Add(Type actionType)
+    private RuleTypeProvider Add(Type actionType)
     {
         var metadata = actionType.GetCustomAttribute<RuleActionAttribute>();
 
         if (metadata == null)
         {
-            return;
+            return this;
         }
 
         var name = GetActionName(actionType);
@@ -136,6 +136,8 @@ public sealed class RuleTypeProvider : ITypeProvider
         }
 
         actionTypes[name] = definition;
+
+        return this;
     }
 
     private static T? GetDataAttribute<T>(PropertyInfo property) where T : ValidationAttribute
diff --git a/backend/tests/Squidex.Domain.Apps.Core.Tests/Model/Rules/RuleTests.cs b/backend/tests/Squidex.Domain.Apps.Core.Tests/Model/Rules/RuleTests.cs
index c47f97fb9..08489c090 100644
--- a/backend/tests/Squidex.Domain.Apps.Core.Tests/Model/Rules/RuleTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Core.Tests/Model/Rules/RuleTests.cs
@@ -5,6 +5,7 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using Squidex.Domain.Apps.Core.HandleRules;
 using Squidex.Domain.Apps.Core.Rules;
 using Squidex.Domain.Apps.Core.Rules.Triggers;
 using Squidex.Domain.Apps.Core.TestHelpers;
@@ -46,11 +47,13 @@ public class RuleTests
         }
     }
 
+    [RuleAction]
     public sealed record TestAction1 : RuleAction
     {
         public string Property { get; set; }
     }
 
+    [RuleAction]
     public sealed record TestAction2 : RuleAction
     {
         public string Property { get; set; }
diff --git a/backend/tests/Squidex.Domain.Apps.Core.Tests/Operations/HandleRules/RuleServiceTests.cs b/backend/tests/Squidex.Domain.Apps.Core.Tests/Operations/HandleRules/RuleServiceTests.cs
index bf0ed47e4..33b27d89e 100644
--- a/backend/tests/Squidex.Domain.Apps.Core.Tests/Operations/HandleRules/RuleServiceTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Core.Tests/Operations/HandleRules/RuleServiceTests.cs
@@ -40,10 +40,12 @@ public class RuleServiceTests
     {
     }
 
+    [RuleAction]
     public sealed record InvalidAction : RuleAction
     {
     }
 
+    [RuleAction]
     public sealed record ValidAction : RuleAction
     {
     }
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/Guards/GuardRuleTests.cs b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/Guards/GuardRuleTests.cs
index f6ffdbfe4..e96ef72fb 100644
--- a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/Guards/GuardRuleTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/Guards/GuardRuleTests.cs
@@ -5,6 +5,7 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using Squidex.Domain.Apps.Core.HandleRules;
 using Squidex.Domain.Apps.Core.Rules;
 using Squidex.Domain.Apps.Core.Rules.Triggers;
 using Squidex.Domain.Apps.Core.TestHelpers;
@@ -23,6 +24,7 @@ public class GuardRuleTests : IClassFixture<TranslationsFixture>
     private readonly NamedId<DomainId> schemaId = NamedId.Of(DomainId.NewGuid(), "my-schema");
     private readonly IAppProvider appProvider = A.Fake<IAppProvider>();
 
+    [RuleAction]
     public sealed record TestAction : RuleAction
     {
         public Uri Url { get; set; }
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleDomainObjectTests.cs b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleDomainObjectTests.cs
index f1cb7283d..94d4c6391 100644
--- a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleDomainObjectTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleDomainObjectTests.cs
@@ -7,6 +7,7 @@
 
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
+using Squidex.Domain.Apps.Core.HandleRules;
 using Squidex.Domain.Apps.Core.Rules;
 using Squidex.Domain.Apps.Core.Rules.Triggers;
 using Squidex.Domain.Apps.Entities.Rules.Commands;
@@ -29,6 +30,7 @@ public class RuleDomainObjectTests : HandlerTestBase<RuleDomainObject.State>
         get => DomainId.Combine(AppId, ruleId);
     }
 
+    [RuleAction]
     public sealed record TestAction : RuleAction
     {
         public int Value { get; set; }
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleState.json b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleState.json
new file mode 100644
index 000000000..b4827b1e2
--- /dev/null
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleState.json
@@ -0,0 +1,20 @@
+{
+    "appId": "06c68527-a2ca-4d84-91eb-a1707aa5b6fb,hotels",
+    "ruleDef": {
+        "trigger": {
+            "triggerType": "ManualTrigger"
+        },
+        "action": {
+            "actionType": "Webhook",
+            "url": "http://squidex.io"
+        },
+        "isEnabled": true
+    },
+    "isDeleted": false,
+    "id": "265aaf1e-5dff-4c40-b1e6-1149f652cd30",
+    "createdBy": "subject:63761585e06d5466c71521b3",
+    "lastModifiedBy": "subject:63761585e06d5466c71521b3",
+    "created": "2022-12-05T11:00:23Z",
+    "lastModified": "2022-12-05T11:00:23Z",
+    "version": 0
+}
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleStateTests.cs b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleStateTests.cs
new file mode 100644
index 000000000..faa88be8e
--- /dev/null
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleStateTests.cs
@@ -0,0 +1,63 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Text.Json.Serialization;
+using Squidex.Domain.Apps.Core.HandleRules;
+using Squidex.Domain.Apps.Core.Rules;
+using Squidex.Domain.Apps.Core.TestHelpers;
+using Squidex.Infrastructure.Json;
+
+namespace Squidex.Domain.Apps.Entities.Rules.DomainObject;
+
+public class RuleStateTests
+{
+    private readonly IJsonSerializer serializer = TestUtils.CreateSerializer(options =>
+    {
+        options.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;
+    });
+
+    [RuleAction]
+    public sealed record WebhookAction : RuleAction
+    {
+        public Uri Url { get; set; }
+    }
+
+    static RuleStateTests()
+    {
+        TestUtils.TypeRegistry.Map(new RuleTypeProvider().Add<WebhookAction>());
+    }
+
+    [Fact]
+    public void Should_deserialize_state()
+    {
+        var json = File.ReadAllText("Rules/DomainObject/RuleState.json");
+
+        var deserialized = serializer.Deserialize<RuleDomainObject.State>(json);
+
+        Assert.NotNull(deserialized);
+    }
+
+    [Fact]
+    public void Should_deserialize_state_from_old_representation()
+    {
+        var json = File.ReadAllText("Rules/DomainObject/RuleState_Old.json");
+
+        var deserialized = serializer.Deserialize<RuleDomainObject.State>(json);
+
+        Assert.NotNull(deserialized);
+    }
+
+    [Fact]
+    public void Should_serialize_deserialize_state()
+    {
+        var json = File.ReadAllText("Rules/DomainObject/RuleState.json").CleanJson();
+
+        var serialized = serializer.Serialize(serializer.Deserialize<RuleDomainObject.State>(json), true);
+
+        Assert.Equal(json, serialized);
+    }
+}
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleState_Old.json b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleState_Old.json
new file mode 100644
index 000000000..65fa5c9b3
--- /dev/null
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/DomainObject/RuleState_Old.json
@@ -0,0 +1,20 @@
+{
+    "appId": "06c68527-a2ca-4d84-91eb-a1707aa5b6fb,hotels",
+    "ruleDef": {
+        "trigger": {
+            "$type": "ManualTrigger"
+        },
+        "action": {
+            "$type": "WebhookAction",
+            "url": "http://squidex.io"
+        },
+        "isEnabled": true
+    },
+    "isDeleted": false,
+    "id": "265aaf1e-5dff-4c40-b1e6-1149f652cd30",
+    "createdBy": "subject:63761585e06d5466c71521b3",
+    "lastModifiedBy": "subject:63761585e06d5466c71521b3",
+    "created": "2022-12-05T11:00:23Z",
+    "lastModified": "2022-12-05T11:00:23Z",
+    "version": 0
+} 
\ No newline at end of file
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/RuleEnqueuerTests.cs b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/RuleEnqueuerTests.cs
index d19f6b6fa..a7aa9d216 100644
--- a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/RuleEnqueuerTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Rules/RuleEnqueuerTests.cs
@@ -31,6 +31,7 @@ public class RuleEnqueuerTests
     private readonly NamedId<DomainId> appId = NamedId.Of(DomainId.NewGuid(), "my-app");
     private readonly RuleEnqueuer sut;
 
+    [RuleAction]
     public sealed record TestAction : RuleAction
     {
         public Uri Url { get; set; }
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Squidex.Domain.Apps.Entities.Tests.csproj b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Squidex.Domain.Apps.Entities.Tests.csproj
index 378a9547b..d3dd6bcea 100644
--- a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Squidex.Domain.Apps.Entities.Tests.csproj
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Squidex.Domain.Apps.Entities.Tests.csproj
@@ -79,11 +79,14 @@
     <None Update="Assets\TestFiles\SampleVideo_1280x720_1mb.mp4">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
+    <None Update="Rules\DomainObject\RuleState_Old.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
     <None Update="Schemas\DomainObject\SchemaState.json">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
-  </ItemGroup>
-  <ItemGroup>
-    <Folder Include="Apps\Invitation\" />
+    <None Update="Rules\DomainObject\RuleState.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 </Project>
\ No newline at end of file