using the ENUM field was a mistake.

scripts/updates/2-8-0/worklog.sql

@@ -1,9 +1,7 @@
 ALTER TABLE `worklog` ADD `ip` VARCHAR(18) NOT NULL DEFAULT '127.0.0.1' AFTER `customer`;
-ALTER TABLE `worklog` CHANGE `level` `level` ENUM('0','1','2','3','255') NOT NULL DEFAULT '1';
 
 ALTER TABLE `worklog` DROP INDEX `timestamp`;
 ALTER TABLE `worklog` DROP INDEX `level`;
-ALTER TABLE `worklog` DROP INDEX `IP`;
 ALTER TABLE `worklog` DROP INDEX `customer`;
 ALTER TABLE `worklog` DROP INDEX `auth_id`;