old_contents: from sqlalchemy import Column, ForeignKey, Integer, String
  from sqlalchemy.orm import relationship
  from sqlalchemy import create_engine
  
  from models.base import Base
  from models.user import User
  from models.store import Store
  from models.product import Product
  
  engine = create_engine('sqlite:///productcatalog.db')
  Base.metadata.create_all(engine)
  
new_contents: from sqlalchemy import Column, ForeignKey, Integer, String
  from sqlalchemy.orm import relationship
  from sqlalchemy import create_engine
  
  from models.base import Base
  from models.user import User
  from models.store import Store
  from models.product import Product
  
  engine = create_engine('postgresql://catalog:catalog123!@localhost:8000/catalog')
  Base.metadata.create_all(engine)
  
subject: Connect database engine to postgresql