public ReleaseSubjectService(
     StatisticsDbContext statisticsDbContext,
     IFootnoteRepository footnoteRepository,
     SubjectDeleter subjectDeleter)
 {
     _statisticsDbContext = statisticsDbContext;
     _footnoteRepository  = footnoteRepository;
     _subjectDeleter      = subjectDeleter;
 }
 public ReleaseSubjectRepository(
     StatisticsDbContext statisticsDbContext,
     IFootnoteRepository footnoteRepository,
     SubjectDeleter?subjectDeleter = null)
 {
     _statisticsDbContext = statisticsDbContext;
     _footnoteRepository  = footnoteRepository;
     _subjectDeleter      = subjectDeleter ?? new SubjectDeleter();
 }