Alsijil is a data protection compliant online class register solution.
With Alsijil you can easily enter absences from people. These are automatically marked as absent (and possibly excused) for the period of absence in all lessons in this time window.
In the weekly view of Alisjil you can filter all lessons by class, teacher or room and thus get an exact list of the lessons that were not documented in the online class book or edit already documented lessons. All edits are clearly saved in the hour view.