old_contents: from sqlalchemy import Column, Integer, String, DateTime
  from sqlalchemy import create_engine
  from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy.orm import sessionmaker
  
  Base = declarative_base()
  
  class Article(Base):
      """Model for Articles"""
      __tablename__ = 'articles'
  
      _id = Column(Integer, primary_key=True)
      source = Column(String)
      title = Column(String)
      url = Column(String)
      author = Column(String)
      date_published = Column(DateTime)
  
      def __init__(self, article):
          self.source = article.source
          self.title = article.title
          self.url = article.url
          self.author = article.author
          self.date_published = article.date_published
  
      def __repr__(self):
          return "<Article(source={0})>"
  
  engine = create_engine('')
  Base.metadata.create_all(engine)
  DBSession = sessionmaker(bind=engine)
  db_session = DBSession()
  
new_contents: from sqlalchemy import Column, Integer, String, DateTime
  from sqlalchemy import create_engine
  from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy.orm import sessionmaker
  
  Base = declarative_base()
  
  class Article(Base):
      """Model for Articles"""
      __tablename__ = 'articles'
  
      _id = Column(Integer, primary_key=True)
      source = Column(String)
      title = Column(String)
      url = Column(String)
      author = Column(String)
      date_published = Column(DateTime)
  
      def __init__(self, article):
          self.source = article.source
          self.title = article.title
          self.url = article.url
          self.author = article.author
          self.date_published = article.date_published
  
      def __repr__(self):
          return ("<Article(source={0}, title={1}, url={2}, author={3}, "
                  "date_published={4})>".format(self.source, self.title,
                  self.url, self.author, self.date_published))
  
  engine = create_engine('')
  Base.metadata.create_all(engine)
  DBSession = sessionmaker(bind=engine)
  db_session = DBSession()
  
subject: Define repr for Article model