DROP TABLE {$prefix}groups_permissions;
ALTER TABLE {$prefix}posts ADD modified INT UNSIGNED NOT NULL DEFAULT (0);
UPDATE {$prefix}posts SET pubdate = strftime('%s', pubdate);
UPDATE {$prefix}posts SET updated = strftime('%s', updated);
UPDATE {$prefix}posts SET modified = strftime('%s', updated);
UPDATE {$prefix}comments SET date = strftime('%s', date);
UPDATE {$prefix}crontab SET last_run=NULL WHERE last_run=0;
UPDATE {$prefix}crontab SET end_time=NULL WHERE end_time=0;
ALTER TABLE {$prefix}rewrite_rules ADD parameters TEXT NULL;