Yes, of course thanks Allan, just had to confirm there was not any provision in place, although I already suspected what would the answer would be.
The point is that I worked for some years in the Internet cable industry and I dearly miss some of the controls there were in place, like the equipment placing leasequeries calls to the DHCP server to confirm the validity of a new IP from a customer, for instance.
About SQL, there used to be also a patched DHCP+TFTP package with an eye in the cable industry, called docsis-server. It was also very convenient interesting in that it mapped the isc-dhcp configuration to well, MySQL tables, simplifying a lot the development of glue software for customer provisioning. I used it at least in two sites, until giving up on it because it was too old and stopped being maintained. You might want to have a look at it.
Regards,
Rui Ribeiro