Hello!

There is a ```delete from `location` where `expires`<'XYZ' AND `expires`<>'1970-01-01 03:00:00'``` query that runs before every time when insert, update or delete for location table is executed. The last query from the provided example was unsuccessful before the second last query deleted the corresponding record.

The test was made on the Kamailio v5.4.0. Usrloc module configuration is: ``` modparam("usrloc", "db_url", DATABASE_URL) modparam("usrloc", "timer_interval", 10) modparam("usrloc", "db_mode", 2) modparam("usrloc", "nat_bflag", FLB_NATB) modparam("usrloc", "db_timer_clean", 1) ```

The test phone I was using - Zoiper softphone updates registration 5 seconds before the expiration. The first registration was at 15:04:43. The following update was at 15:05:38. Following DB queries were executed:

``` 529486 Query delete from `location` where `expires`<'2020-08-24 15:04:45' AND `expires`<>'1970-01-01 03:00:00' 529485 Query insert into `location` (`username`,`contact`,`expires`,`q`,`callid`,`cseq`,`flags`,`cflags`,`user_agent`,`received`,`socket`,`last_modified`,`ruid`,`reg_id`,`server_id`,`connection_id`,`keepalive`,`partition` ) values ('300-test','sip:300-test@192.168.0.105:56022;rinstance=5dd76a9c6cb94169;transport=tcp','2020-08-24 15:05:43',-1.000000,'DQzsJiW2Cpjs66s88IkOMQ..',2,0,0,'Z 3.15.40006 rv2.8.20','sip:XXX.XXX.XXX.XXX:56317;transport=tcp','tcp:172.16.30.216:5060','2020-08-24 15:04:43','uloc-5f43acc8-1f59-1',0,0,1,0,0)

529486 Query delete from `location` where `expires`<'2020-08-24 15:04:55' AND `expires`<>'1970-01-01 03:00:00'

529486 Query delete from `location` where `expires`<'2020-08-24 15:05:05' AND `expires`<>'1970-01-01 03:00:00'

529486 Query delete from `location` where `expires`<'2020-08-24 15:05:15' AND `expires`<>'1970-01-01 03:00:00'

529486 Query delete from `location` where `expires`<'2020-08-24 15:05:25' AND `expires`<>'1970-01-01 03:00:00'

529486 Query delete from `location` where `expires`<'2020-08-24 15:05:35' AND `expires`<>'1970-01-01 03:00:00'

529486 Query delete from `location` where `expires`<'2020-08-24 15:05:45' AND `expires`<>'1970-01-01 03:00:00' 529485 Query update `location` set `expires`='2020-08-24 15:06:38',`q`=-1.000000 ,`cseq`=3,`flags`=0,`cflags`=0,`user_agent`='Z 3.15.40006 rv2.8.20',`received`='sip:XXX.XXX.XXX.XXX:56317;transport=tcp',`path`=NULL,`socket`='tcp:172.16.30.216:5060',`methods`=NULL,`last_modified`='2020-08-24 15:05:38',`callid`='DQzsJiW2Cpjs66s88IkOMQ..',`instance`=NULL,`reg_id`=0,`server_id`=0,`connection_id`=1,`keepalive`=0,`contact`='sip:300-test@192.168.0.105:56022;rinstance=5dd76a9c6cb94169;transport=tcp' where `ruid`='uloc-5f43acc8-1f59-1' ```

Reducing timer_interval value to 3 seconds corrected the behavior for me. But is it possible to run ```delete from `location` where `expires`<'XYZ' AND `expires`<>'1970-01-01 03:00:00'``` query not before but after queries that manage particular registrations are executed?

Thank you!