old_contents: from sqlalchemy import create_engine
  from sqlalchemy.orm import scoped_session, sessionmaker
  from sqlalchemy.ext.declarative import declarative_base
  
  engine = create_engine('sqlite:///db/auth.db', convert_unicode=True)
  db_session = scoped_session(sessionmaker(autocommit=False, autoflush=False, bind=engine))
  Base = declarative_base()
  Base.query = db_session.query_property()
  
  def init_db():
      # import all modules here that might define models so that
      # they will be registered properly on the metadata.  Otherwise
      # you will have to import them first before calling init_db()
      import models
      Base.metadata.create_all(bind=engine)
  
new_contents: from sqlalchemy import create_engine
  from sqlalchemy.orm import scoped_session, sessionmaker
  from sqlalchemy.ext.declarative import declarative_base
  
  db_file = 'db/auth.db'
  engine = create_engine('sqlite:///{}'.format(db_file), convert_unicode=True)
  db_session = scoped_session(sessionmaker(autocommit=False, autoflush=False, bind=engine))
  Base = declarative_base()
  Base.query = db_session.query_property()
  
  def init_db():
      # import all modules here that might define models so that
      # they will be registered properly on the metadata.  Otherwise
      # you will have to import them first before calling init_db()
      import models
      Base.metadata.create_all(bind=engine)
  
subject: Add db_file