refactor: 💡 model grants as a fragment-array for statefulness

addons/api/addon/generated/models/role.js

@@ -33,4 +33,10 @@ export default class GeneratedRoleModel extends BaseModel {
     description: 'Whether the resource is disabled',
   })
   disabled;
+
+  @attr('number', {
+    description: 'Current version number of this resource.',
+  })
+  version;
+  
 }