[tor-relays] rm /var/lib/tor/keys/* before changing exit policy?

Really quick not too important question. When switching a relay to become an exit node or the other way round, does it make sense to delete /var/lib/tor/keys/* beforehand and start it over this way? I was thinking, if the relay has the guard flag, it would make sense, but maybe even if it doesn't. I don't know. I'll do it I guess. thanks martin