Extend schema grain.

src/Squidex.Domain.Apps.Entities/Schemas/Commands/CreateSchema.cs

@@ -22,6 +22,8 @@ namespace Squidex.Domain.Apps.Entities.Schemas.Commands
 
         public SchemaProperties Properties { get; set; }
 
+        public bool Singleton { get; set; }
+
         public bool Publish { get; set; }
 
         public CreateSchema()

src/Squidex.Domain.Apps.Entities/Schemas/ISchemaEntity.cs

@@ -25,6 +25,8 @@ namespace Squidex.Domain.Apps.Entities.Schemas
 
         bool IsPublished { get; }
 
+        bool IsSingleton { get; }
+
         bool IsDeleted { get; }
 
         string ScriptQuery { get; }

src/Squidex.Domain.Apps.Entities/Schemas/State/SchemaState.cs

@@ -37,6 +37,9 @@ namespace Squidex.Domain.Apps.Entities.Schemas.State
         [JsonProperty]
         public bool IsDeleted { get; set; }
 
+        [JsonProperty]
+        public bool IsSingleton { get; set; }
+
         [JsonProperty]
         public string ScriptQuery { get; set; }
 
@@ -65,6 +68,8 @@ namespace Squidex.Domain.Apps.Entities.Schemas.State
         {
             Name = @event.Name;
 
+            IsSingleton = @event.Singleton;
+
             var schema = new Schema(@event.Name);
 
             if (@event.Properties != null)

src/Squidex.Domain.Apps.Events/Schemas/SchemaCreated.cs

@@ -20,6 +20,8 @@ namespace Squidex.Domain.Apps.Events.Schemas
 
         public SchemaProperties Properties { get; set; }
 
+        public bool Singleton { get; set; }
+
         public bool Publish { get; set; }
     }
 }

tests/Squidex.Domain.Apps.Entities.Tests/Schemas/SchemaGrainTests.cs

@@ -62,7 +62,7 @@ namespace Squidex.Domain.Apps.Entities.Schemas
         {
             var properties = new SchemaProperties();
 
-            var command = new CreateSchema { Name = SchemaName, SchemaId = SchemaId, Properties = properties };
+            var command = new CreateSchema { Name = SchemaName, SchemaId = SchemaId, Properties = properties, Singleton = true };
 
             var result = await sut.ExecuteAsync(CreateCommand(command));
 
@@ -72,10 +72,11 @@ namespace Squidex.Domain.Apps.Entities.Schemas
 
             Assert.Equal(SchemaName, sut.Snapshot.Name);
             Assert.Equal(SchemaName, sut.Snapshot.SchemaDef.Name);
+            Assert.True(sut.Snapshot.IsSingleton);
 
             LastEvents
                 .ShouldHaveSameEvents(
-                    CreateEvent(new SchemaCreated { Name = SchemaName, Properties = properties })
+                    CreateEvent(new SchemaCreated { Name = SchemaName, Properties = properties, Singleton = true })
                 );
         }