--- /dev/null
+-- Rename the archive.ar_usertext_timestamp index to usertext_timestamp.
+-- This is for MySQL only and is only necessary on wikis freshly installed on
+-- 1.28.0 when bug T154872 was present. The patch will probably be removed in
+-- 1.29 since we plan on renaming the index properly to ar_usertext_timestamp.
+ALTER TABLE /*$wgDBprefix*/archive
+ DROP INDEX ar_usertext_timestamp,
+ ADD INDEX usertext_timestamp (ar_user_text,ar_timestamp);