[Freeswitch-users] multi tenet user directory management best practice

Hello, This question raises a lot, but no simple answer, so I'm trying to ask it differently. Let's say I have 5 FS servers and Opensips/Kamailio as a load balancer. I'm afraid that creating it using xml files is not dynamic enough, and requires duplications. mod_xml_rpc does not store that information on each update of the server itself, and there is no API for providing database management that I could find. So what is the best practice regarding of creating a user directory that all of the PBX will be able to handle ? Thanks Ido