Combining two requests into one task ({T245413} and {T245921})
https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/CentralAuth/+/572647/1/db_patches/patch-gug_expiry.sql
```lang=sql
ALTER TABLE /*_*/global_user_groups
ADD COLUMN gug_expiry varbinary(14) NULL default NULL,
ADD INDEX gug_expiry (gug_expiry);
```
https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/CentralAuth/+/574188/2/db_patches/patch-remove-dupe-indexes.sql (merged)
```lang=sql
ALTER TABLE global_user_groups
DROP INDEX gug_user;
ALTER TABLE global_group_permissions
DROP INDEX ggp_group;
```
Combined SQL:
```lang=sql
ALTER TABLE global_group_permissions
DROP INDEX ggp_group;
ALTER TABLE /*_*/global_user_groups
ADD COLUMN gug_expiry varbinary(14) NULL default NULL,
ADD INDEX gug_expiry (gug_expiry),
DROP INDEX gug_user;
```
**Where:** centralauth database (s7)
**When:** At DBA leisure
**Backwards compatible:** Yes
**Tested already:** Index removals applied to beta