old_contents: from flask import Flask
  from sqlalchemy.orm import sessionmaker
  from database_setup import engine
  
  
  app = Flask('item-catalog')
  
  DBsession = sessionmaker(bind=engine)
  session = DBsession()
  
new_contents: from flask import Flask
  from sqlalchemy.orm import sessionmaker
  from database import engine
  
  
  app = Flask('item-catalog')
  
  DBsession = sessionmaker(bind=engine)
  session = DBsession()
  
subject: fix faulty import in modules/setup/app.py