| B | ↘ | F | AdminController got worse |
| ⇢ | C | AdminController::attachOrphanFileToCourse() added | |
| ⇢ | B | AdminController::deleteOrphanFile() added | |
| ⇢ | B | CourseManager::deleteExclusiveResourceFiles() added | |
| ⇢ | A | CourseManager::getExclusiveResourceFilesForCourse(... added | |
| C | ↘ | D | CourseManager::delete_course() got worse |