new_contents: from flask_script import Manager, Shell
  from flask_migrate import Migrate, MigrateCommand
  
  from app import app, db
  
  manager = Manager(app)
  migrate = Migrate(app, db)
  
  
  def make_shell_context():
      '''Returns application and database instances
      to the shell importing them automatically
      on `python manager.py shell`.
      '''
      return dict(app=app, db=db)
  
  
  manager.add_command("shell", Shell(make_context=make_shell_context))
  manager.add_command('db', MigrateCommand)
  
  if __name__ == '__main__':
      manager.run()
  
subject: set up manage.py