ALTER TABLE phabricator_search.search_query
  DROP authorPHID;

ALTER TABLE phabricator_search.search_query
  ADD queryKey VARCHAR(12) NOT NULL;

/* Preserve URIs for old queries in case anyone has them bookmarked. */
UPDATE phabricator_search.search_query
  SET queryKey = id;

ALTER TABLE phabricator_search.search_query
  ADD UNIQUE KEY (queryKey);