array( 'addField', 'ipblocks', 'ipb_parent_block_id', 'patch-ipb-parent-block-id.sql' ),
array( 'addIndex', 'ipblocks', 'ipb_parent_block_id', 'patch-ipb-parent-block-id-index.sql' ),
array( 'dropField', 'category', 'cat_hidden', 'patch-cat_hidden.sql' ),
+
+ // 1.21
+ array( 'dropField', 'site_stats', 'ss_admins', 'patch-drop-ss_admins.sql' ),
);
}