On Mar 7, 2019, at 9:13 AM, Brooke Storm &lt;bstorm(a)wikimedia.org&gt; wrote: Since the comment refactor of the Mediawiki database schema has been progressing (https://phabricator.wikimedia.org/T166733 <https://phabricator.wikimedia.org/T166732> and many other tickets), one of the last steps is dropping the columns from views on the wiki replica schema. The column drops are being tracked and are explained well here https://phabricator.wikimedia.org/T212972 <https://phabricator.wikimedia.org/T212972>, and currently the change is ready to be applied. It is already applied to two wikis (eswiki and huwiki since there was a column problem that needed fixing). The tables with names such as <tablename>_compat will retain a similar structure if that is needed for refactoring. From the ticket, this is a summary of what is changing, organized by table name: archive: Remove ar_comment archive_userindex: Remove ar_comment filearchive: Remove fa_deleted_reason Remove fa_description filearchive_userindex: Remove fa_deleted_reason Remove fa_description image: Remove img_description ipblocks: Remove ipb_reason. ipblocks_ipindex: Remove ipb_reason. logging: Remove log_comment. logging_logindex: Remove log_comment. logging_userindex: Remove log_comment. oldimage: Remove oi_description oldimage_userindex: Remove oi_description recentchanges: Remove rc_comment. recentchanges_userindex: Remove rc_comment. revision: Remove rev_comment. revision_userindex: Remove rev_comment. The changes to the _compat tables should not affect anything. We will deploy the change early next week (Tuesday - 3/12/2019). In most cases, if a table isn’t working for your tool or app anymore because of the change, you can switch to a table named $tablename_compat and it will appear to have the same schema, but it is recommended that comment references use a join to the new comment table on a “comment_id” field instead where possible. Brooke Storm Operations Engineer Wikimedia Cloud Services bstorm(a)wikimedia.org <mailto:bstorm@wikimedia.org> IRC: bstorm_