Apply T312266 to wmf wikis
# **ALTERs to run:** https://gerrit.wikimedia.org/r/c/mediawiki/extensions/ContentTranslation/+/817875/1/sql/mysql/patch-cx_translators-unique-to-pk.sql
# **Where to run those changes:** All wikipedias (tables on x1.wikishared) + testwiki
# **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
Maybe it is better to apply the DROP + ALTER in reverse order in production to avoid that there is a time gap without unique constraint, because both statement as written in the linked file are not atomic (as far as I know, not sure if a atomic way is possible)
Progress
[x] s3 (testwiki)
[] x1 (wikishared)
** [] eqiad
** [x] codfw