def reset_db():
for user in User.all(): user.delete()
for ycs in YearCourseSemester.all(): ycs.delete()
for mod in Module.all(): mod.delete()
for sub in Subscription.all(): sub.delete()
for sub in Category.all(): sub.delete()
for i in Thread.all(): i.delete()
for i in Post.all(): i.delete()
for i in Rating.all(): i.delete()
for i in Assessment.all(): i.delete()
for i in Grade.all(): i.delete()
for i in Lecturer.all(): i.delete()
for i in LecturerRating.all(): i.delete()
