Apply T312275 to wmf wikis
# **ALTERs to run:** https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CreditsSource/+/817884/3/schema/mysql/patch-swauthor_links-unique-to-pk.sql
# **Where to run those changes:** wikivoyage.dblist
# **When to run those changes:** any time
# **If the schema change is backwards compatible:** Yes
# **If the schema change has been tested already on some of the test/beta wikis:** beta already running with the new schema
# **if the data should be made available on the labs replicas and/or dumps:** no change of the existing rules
Due to a bug in the schema change generator (T314138) the DROP + ALTER should be rewritten to be atomic:
```
alter table swauthor_links drop key swal_srcwork_author_unique, ADD PRIMARY KEY (swal_srcworkid, swal_authorid);
```