Toolserver:Database schema/User and associated

User
+---+-+--+-+-+---+ +---+-+--+-+-+---+ +---+-+--+-+-+---+
 * Field            | Type            | Null | Key | Default | Extra |
 * user_id          | int(5) unsigned | NO   |     | 0       |       |
 * user_name        | varchar(255)    | NO   |     |         |       |
 * user_registration | varchar(14)    | YES  |     | NULL    |       |
 * user_editcount   | int(11)         | YES  |     | NULL    |       |

User_groups
+--+-+--+-+-+---+ +--+-+--+-+-+---+ +--+-+--+-+-+---+
 * Field   | Type            | Null | Key | Default | Extra |
 * ug_user | int(5) unsigned | NO   |     | 0       |       |
 * ug_group | char(16)       | NO   |     |         |       |