text: from database import db
  
  class User(db.Model):
      # __table_args__ = {"schema": "demo"}
      __tablename__ = 'user'
  
      id = db.Column(db.Integer, primary_key=True,  autoincrement=True)
      name = db.Column(db.String(20))
      age = db.Column(db.Integer)
  
      def __init__(self, name, age):
          self.name = name
          self.age = age
  