old_contents: #!/usr/bin/env python3
  from ietf.utility.environment import get_db_path
  from ietf.sql.base import Base
  from ietf.sql.rfc import Rfc
  from sqlalchemy import create_engine
  from sqlalchemy.orm import sessionmaker
  
  
  def get_db_session():
      """Return a DB session."""
      db_path = get_db_path()
      engine = create_engine("sqlite:///{}".format(db_path))
      Base.metadata.create_all(engine, checkfirst=True)
      session = sessionmaker(bind=engine)()
      return session
  
  
  def query_rfc_by_id(session, number):
      row = session.query(Rfc).\
                    filter(Rfc.id == number).\
                    one_or_none()
      return row
  
new_contents: #!/usr/bin/env python3
  from ietf.utility.environment import get_db_path
  from ietf.sql.base import Base
  from ietf.sql.rfc import Rfc
  from sqlalchemy import create_engine
  from sqlalchemy.orm import sessionmaker
  
  
  def get_db_session():
      """Return a DB session."""
      db_path = get_db_path()
      engine = create_engine("sqlite:///{}".format(db_path))
      Base.metadata.create_all(engine, checkfirst=True)
      session = sessionmaker(bind=engine)()
      return session
  
  
  def query_rfc(session, number):
      row = session.query(Rfc).\
                    filter(Rfc.id == number).\
                    one_or_none()
      return row
  
subject: Rename `query_rfc_by_id()`