text: import sqlalchemy as sa
  from sqlalchemy.ext.declarative import declarative_base
  
  Base = declarative_base()
  
  
  class Url(Base):
      __tablename__ = 'urls'
  
      id = sa.Column(sa.Integer, primary_key=True)
      full_url = sa.Column(sa.Text)
      short_url = sa.Column(sa.Text)
  