add db rev scripts for kamailio dialog db backend

db_scripts/diff/8293.down

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+use kamailio;
+
+ALTER TABLE dialog CHANGE COLUMN `caller_cseq` `caller_cseq` varchar(7) NOT NULL;
+ALTER TABLE dialog CHANGE COLUMN `callee_cseq` `callee_cseq` varchar(7) NOT NULL;
+ALTER TABLE dialog DROP COLUMN `toroute_name`;
+UPDATE version set table_version=5 where table_name='dialog';

db_scripts/diff/8293.up

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+use kamailio;
+
+ALTER TABLE dialog CHANGE COLUMN `caller_cseq` `caller_cseq` varchar(20) NOT NULL;
+ALTER TABLE dialog CHANGE COLUMN `callee_cseq` `callee_cseq` varchar(20) NOT NULL;
+ALTER TABLE dialog ADD COLUMN `toroute_name` varchar(32) DEFAULT NULL AFTER `toroute`;
+REPLACE INTO version(table_name, table_version) VALUES ('dialog', 5);