fix: get circle more professional

server/vbv_lernwelt/dashboard/graphql/types/dashboard.py

@@ -188,19 +188,14 @@ class CourseStatisticsType(graphene.ObjectType):
             )
             generations.add(course_session.generation)
 
-            # Get all circles for this course session
-            siblings = (
+            circles = (
                 course_session.course.get_learning_path()
                 .get_descendants()
                 .live()
                 .specific()
+                .exact_type(Circle)
             )
 
-            circles = []
-            for sibling in siblings:
-                if sibling.specific_class == Circle:
-                    circles.append(sibling.specific)
-
             for circle in circles:
                 circle_data.append(
                     StatisticsCircleDataType(