ExamOfficeField
    office  UserId
    field   StudyTermsId
    forced  Bool
    UniqueExamOfficeField office field
ExamOfficeUser
    office  UserId
    user    UserId
    UniqueExamOfficeUser office user
ExamOfficeResultSynced
    school  SchoolId Maybe
    office  UserId
    result  ExamResultId
    time    UTCTime