[Freeswitch-users] How to delete entry from sip_regisration table?

We connect freeswitch using odbc connection for device registration on server. Now the problem occur when Freeswitch crashed,down or restart uncertainly that time the entry does not removed from sip_registration table and next time user are not able to make the call. Then we have to manually delete that entry from database to make it working. OS : Debian8 FS version : FreeSWITCH Version 1.6.6~64bit ( 64bit) can anybody help us to resolve this issue?