text: """Helper class to get a database engine and to get a session."""
  from pollbot.config import config
  from sqlalchemy import create_engine
  from sqlalchemy.orm import scoped_session
  from sqlalchemy.orm.session import sessionmaker
  from sqlalchemy.ext.declarative import declarative_base
  
  engine = create_engine(config['database']['sql_uri'],
                         pool_size=config['database']['connection_count'],
                         max_overflow=config['database']['overflow_count'],
                         echo=False)
  base = declarative_base(bind=engine)
  
  
  def get_session(connection=None):
      """Get a new db session."""
      session = scoped_session(sessionmaker(bind=engine))
      return session
  