array( 'addIndex', 'revision', 'page_user_timestamp', 'patch-revision-user-page-index.sql' ),
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( 'addField', 'revision', 'rev_content_format', 'patch-revision-rev_content_format.sql' ),
+ array( 'addField', 'revision', 'rev_content_model', 'patch-revision-rev_content_model.sql' ),
+ array( 'addField', 'archive', 'ar_content_format', 'patch-archive-ar_content_format.sql' ),
+ array( 'addField', 'archive', 'ar_content_model', 'patch-archive-ar_content_model.sql' ),
+ array( 'addField', 'page', 'page_content_model', 'patch-page-page_content_model.sql' ),
+ array( 'dropField', 'site_stats', 'ss_admins', 'patch-drop-ss_admins.sql' ),
+ array( 'dropField', 'recentchanges', 'rc_moved_to_title', 'patch-rc_moved.sql' ),
+ array( 'addTable', 'sites', 'patch-sites.sql' ),
+ array( 'addField', 'filearchive', 'fa_sha1', 'patch-fa_sha1.sql' ),
+ array( 'addField', 'job', 'job_token', 'patch-job_token.sql' ),
);
}