text: import datetime
  import mongoengine as db
  
  class User(db.Document):
      created_at = db.DateTimeField(defeult = datetime.datetime.now)
      username   = db.StringField(required = True)
      password   = db.StringField(required = True)
  
      todo_ids   = db.ListField()
  
      meta       = {
          'db_alias'  : 'core',
          'collection': 'users'
      }
  