| ⇢ | A | Version20250619114200 added | |
| B | ↘ | C | GradebookCategory got worse |
| ⇢ | A | Version20250619114200::down() added | |
| ⇢ | A | Version20250619114200::getDescription() added | |
| ⇢ | A | Version20250619114200::up() added | |
| ⇢ | A | GradebookCategory::setCertificateValidityPeriod() added | |
| ⇢ | A | GradebookCategory::getCertificateValidityPeriod() added |