Wikibase/Schema/wb changes

Versions
Current as of Wikibase 0.4 (19 Feb 2013) ++--+--+-+-++ ++--+--+-+-++ ++--+--+-+-++
 * Field             | Type             | Null | Key | Default | Extra          |
 * change_id         | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
 * change_type       | varbinary(25)    | NO   | MUL | NULL    |                |
 * change_time       | varbinary(14)    | NO   | MUL | NULL    |                |
 * change_object_id  | varbinary(14)    | NO   | MUL | NULL    |                |
 * change_revision_id | int(10) unsigned | NO  | MUL | NULL    |                |
 * change_user_id    | int(10) unsigned | NO   | MUL | NULL    |                |
 * change_info       | blob             | NO   |     | NULL    |                |