I haven't tried, but --update-certificate should be what you want. if you store a certificate twice, then of course it is stored twice.
but if you store it once, and update it later, there should be only one. Andreas -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org