* Schema change: https://gerrit.wikimedia.org/r/#/c/304136/1/client/sql/entity_usage-drop-touched.sql
* Needs to be applied to all wikis with the `wbc_entity_usage` table (all of these should be in the `wikidataclient` dblist)
* The schema change can be applied at any time, our code is not using/ referring to that column for quite some time now.
* The change in question has been merged in Wikibase master with the involvement of several team members (4f5fd0e02071c6d7a58786ea4aedbcca60271b5c).
Schema change progress:
[] s1
** [x] codfw
** [x] eqiad progress T144010#4468700
[] s2
** [x] codfw
** [x] eqiad progress T144010#4437194
[] s3
** [x] codfw
** [] eqiad progress
[] s4
** [x] codfw
** [] eqiad progress T144010#4446888 (The master only pending, will be done once eqiad is a passive DC)
[] s5
** [x] codfw
** [x] eqiad progress T144010#4426318
[] s6
** [x] codfw
** [x] eqiad progress T144010#4429728
[] s7
** [x] codfw
** [x] eqiad progress T144010#4450277
[] s8
** [x] codfw
** [x] eqiad progress T144010#4461467
[] wikitech - doesn't apply, this table doesn't exist there.
** [] labswiki
** [] labtestwiki