feat: nested department sections, attaching department sections in the user editor

routers/user.py

@@ -35,6 +35,19 @@ async def update(
     return await UserService(session).update(request)
 
 
+@user_router.post(
+    '/update/department-sections/{user_id}',
+    response_model=UpdateUserDepartmentSectionsResponse,
+    operation_id='update_user_department_sections'
+)
+async def update_user_department_sections(
+        session: SessionDependency,
+        user_id: int,
+        request: UpdateUserDepartmentSectionsRequest,
+):
+    return await UserService(session).update_department_sections(user_id, request)
+
+
 @user_router.post(
     '/create',
     response_model=CreateUserResponse,