old_contents: import logging
  
  import sqlahelper
  import sqlalchemy as sa
  import sqlalchemy.orm as orm
  import transaction
  
  log = logging.getLogger(__name__)
  
  Base = psqlaheper.get_base()
  Session = psqlahelper.get_session()
  
  
  #class MyModel(Base):
  #    __tablename__ = "models"
  #
  #    id = sa.Column(sa.Integer, primary_key=True)
  #    name = sa.Column(sa.Unicode(255), nullable=False)
  
new_contents: import logging
  
  import sqlahelper
  import sqlalchemy as sa
  import sqlalchemy.orm as orm
  import transaction
  
  log = logging.getLogger(__name__)
  
  Base = sqlahelper.get_base()
  Session = sqlahelper.get_session()
  
  
  #class MyModel(Base):
  #    __tablename__ = "models"
  #
  #    id = sa.Column(sa.Integer, primary_key=True)
  #    name = sa.Column(sa.Unicode(255), nullable=False)
  
subject: Fix variable name.