old_contents: from models import db, User, Record
  db.create_all()
  # admin = User('admin1', 'admin1@example.com')
  # guest = User('guest', 'guest@example.com')
  # db.session.add(admin)
  # db.session.add(guest)
  # db.session.commit()
  records = Record.query.all()
  one = Record.query.filter_by(id=1).first()
  print one
new_contents: from models import db, Record
  db.create_all()
  # admin = User('admin1', 'admin1@example.com')
  # guest = User('guest', 'guest@example.com')
  # db.session.add(admin)
  # db.session.add(guest)
  # db.session.commit()
  records = Record.query.all()
  one = Record.query.filter_by(id=1).first()
  print one
subject: delete User class