| ⇢ | A | ToolRepository added | |
| ⇢ | A | Version20210930130343 added | |
| F | ↗ | C | CourseArchiver improved |
| ⇢ | B | Version20210930130343::up() added | |
| ⇢ | A | ToolRepository::__construct() added | |
| ⇢ | A | Version20210930130343::down() added | |
| ⇢ | A | Version20210930130343::getDescription() added | |
| B | ↗ | A | CourseArchiver::readCourse() improved |
| B | ↘ | F | Version20201212114910::up() got worse |