Kohana 3 mysql config table schema

config.sql

CREATE TABLE IF NOT EXISTS `config` (
  `id` int(11) NOT NULL auto_increment,
  `group_name` varchar(32) character set utf8 NOT NULL,
  `config_key` varchar(32) character set utf8 NOT NULL,
  `label` varchar(64) character set utf8 NOT NULL,
  `config_value` text character set utf8,
  `default` text character set utf8,
  `rules` text character set utf8,
  `field_type` varchar(255) character set utf8 NOT NULL default 'text',
  `date` timestamp NOT NULL default CURRENT_TIMESTAMP,
  PRIMARY KEY  (`id`),
  UNIQUE KEY `group` (`group_name`,`config_key`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;