IBM on Monday is expected to announce the acquisition of database security start-up Guardium for $225 million, according to reports citing Israeli financial newspaper, TheMarker, which first reported the deal. An IBM spokesman declined to comment about the deal when contacted by on Monday. Israeli daily Ha'aretz reported that IBM has been courting Guardium since January. Guardium has about 60 employees and was founded in Israel in 2002 but moved to Boston in 2003. — AM