purge_not_seens.php

This script deletes all references to systems not seen during a certain period of time in the a FreeNAC system.

 The period of time is defined by the config variable delete_not_seen, which uses months as units of time.

For each system which has not been seen during the past delete_not_seen months, a cascade delete if performed, removing thus all references to this device from all tables in a FreeNAC system.