**Context:** We would like the new columns for T339982 and T337768 to be created in production.
**ALTERs to run:**
```lang=sql
ALTER TABLE ce_participants
ADD COLUMN cep_first_answer_timestamp BINARY(14) DEFAULT NULL AFTER cep_unregistered_at,
ADD COLUMN cep_aggregation_timestamp BINARY(14) DEFAULT NULL AFTER cep_first_answer_timestamp,
ADD INDEX cep_aggregation (cep_aggregation_timestamp);
ALTER TABLE ce_organizers
ADD COLUMN ceo_agreement_timestamp BINARY(14) DEFAULT NULL;
```
# **Where to run those changes:** These tables are in the extension1 cluster. In particular, they can be found in the per-wiki databases of testwiki, test2wiki, and officewiki, as well as in the wikishared database. So it's a total of 4 places.
# **When to run those changes:** After deployment of 1.41.0-wmf.16, next week
# **If the schema change is backwards compatible:** Yes (new columns are DEFAULT NULL)
# **If the schema change has been tested already on some of the test/beta wikis:** Tested locally
# **if the data should be made available on the labs replicas and/or dumps:** Maybe, but we don't replicate data from x1 anyway.