add REGISTRAR_DB_REMOVE_EXPIRED_DELAY macro

kamailio/registrar-role.cfg

@@ -34,6 +34,7 @@
 #!trydef REGISTRAR_DB_TIMER_CLEANUP 0
 #!trydef REGISTRAR_HANDLE_LOST_TCP 0
 #!trydef REGISTRAR_DB_TIMER_CLEANUP 0
+#!trydef REGISTRAR_DB_REMOVE_EXPIRED_DELAY 30
 
 #!ifdef REGISTRAR_WARM_CACHE
 #!substdef "!REGISTRAR_S_WARM_CACHE!dbtable=auth_cache;dbmode=1;!g"
@@ -62,7 +63,7 @@ modparam("usrloc", "db_mode", REGISTRAR_DB_MODE)
 
 modparam("usrloc", "db_timer_clean", REGISTRAR_DB_TIMER_CLEANUP)
 modparam("usrloc", "handle_lost_tcp", REGISTRAR_HANDLE_LOST_TCP)
-modparam("usrloc", "rm_expired_delay", 30)
+modparam("usrloc", "rm_expired_delay", REGISTRAR_DB_REMOVE_EXPIRED_DELAY)
 
 modparam("usrloc", "db_check_update", 1)
 modparam("usrloc", "db_ops_ruid", 1)