Active Academic Year

Every student record and mark entry — for every class, exam, and subject — is filed under this year. Changing it points ALL new write operations at the newly activated year going forward; it never touches, overwrites, or moves any previous year's data, which stays fully readable (Print Ledger / Gradesheet's year picker) but permanently locked from further edits. There's no practical limit on how many years the database can hold — a new year is simply a new, separate slice of storage, so this supports an indefinite number of future academic years.