See parent tasks.

ALTERs to run:

ALTER TABLE ce_address
  DROP cea_country,
  CHANGE cea_country_code cea_country_code BINARY(2) NOT NULL;

(The column change is actually changing a DEFAULT NULL to NOT NULL)

1. Where to run those changes:
   1. x1.testwiki
   2. x1.test2wiki
   3. x1.officewiki
   4. x1.wikishared
2. When to run those changes: Later this week, once everything is on 1.46.0-wmf.1 (due to r1200390 dropping unintended references to the old schema in write_new/read_new)
3. If the schema change is backwards compatible: Yes because the migration is already in the migration_new stage and old rows have been backfilled
4. If the schema change has been tested already on some of the test/beta wikis: Tested locally
5. if the data should be made available on the labs replicas and/or dumps: The table is in x1 and therefore not replicated.
6. Is this schema change blocking a feature rollout? No