[SR-Users] Saving REGISTER status in kamailio database while REGSITER packets are forwarded.

I setup kamailio to forward REGISTER packets using dispatcher to two servers main and backup. The routing logic is quite simple i use the dispatcher probing mechanism to detect if my main dispatcher set id (one server) is active or inactive once it detect a failure all packets are sent to secondary SIP server to achieve High Availability. I am looking for module or a way to save into kamailio database client information such as IP address, register username (from FROM header), digest username (authorization username), call-id for successful registration. I tried to use registrar module but once i used function save("location") the client was registered on kamailio and packets was not forwarded to main/secondary SIP server (like dispatcher stopped working, the destination did not override). REGISTER is sent to SIP URI of kamailio. Please let me know if you have any idea how to make this data update in database (insert an entry on fresh successfull REGISTER, delete on expired or removed binding). Best regards, Tomasz