Faced with a deadline to obtain a grand jury indictment, the government and lawyers for disgraced money manager Bernard Madoff agreed Wednesday to a 30-day delay. A federal magistrate judge approved the postponement Wednesday, when the government had faced a deadline to indict the Wall Street financier. The new deadline to bring an indictment was moved to March 13. A message for comment left with Ira Sorkin, a lawyer for Madoff, was not immediately returned. Rebekah Carmichael, a spokeswoman for prosecutors, said the office had no comment on the matter.