text: import sqlalchemy as sa
  from sqlalchemy.ext.declarative import declarative_base
  
  Base = declarative_base()
  
  
  class User(Base):
      __tablename__ = "users"
  
      id = sa.Column(sa.Integer, primary_key=True)
      username = sa.Column(sa.String, unique=True)
      password = sa.Column(sa.String)
  