Removing attributes for migrations as a library that does this already exists.

Updating a few DTOs for programmatic creation.

src/Umbraco.Core/Persistence/DatabaseAnnotations/PrimaryKeyColumnAttribute.cs

@@ -14,5 +14,6 @@ namespace Umbraco.Core.Persistence.DatabaseAnnotations
         public bool Clustered { get; set; }//Defaults to true
         public bool AutoIncrement { get; set; }//Default to true
         public string Name { get; set; }//Overrides the default naming of a PrimaryKey constraint: PK_tableName
+        public string OnColumns { get; set; }
     }
 }