code: def get_session(db_url):
          # type: (str) -> Session
          
          engine = create_engine(db_url, poolclass=NullPool, echo=False)
          Session = sessionmaker(bind=engine)
          Base.metadata.create_all(engine)
          return Session()
docs: Gets SQLAlchemy session given url. Your tables must inherit
          from Base in hdx.utilities.database.
  
          Args:
              db_url (str): SQLAlchemy url
  
          Returns:
              sqlalchemy.orm.session.Session: SQLAlchemy session