INSERT INTO version (table_name, table_version) values ('usr_preferences','2');
CREATE TABLE usr_preferences (
    id INT(10) UNSIGNED AUTO_INCREMENT PRIMARY KEY NOT NULL,
    uuid VARCHAR(64) DEFAULT '' NOT NULL,
    username VARCHAR(128) DEFAULT 0 NOT NULL,
    domain VARCHAR(64) DEFAULT '' NOT NULL,
    attribute VARCHAR(32) DEFAULT '' NOT NULL,
    type INT(11) DEFAULT 0 NOT NULL,
    value VARCHAR(128) DEFAULT '' NOT NULL,
    last_modified DATETIME DEFAULT '1900-01-01 00:00:01' NOT NULL
) ENGINE=MyISAM;

CREATE INDEX ua_idx ON usr_preferences (uuid, attribute);
CREATE INDEX uda_idx ON usr_preferences (username, domain, attribute);