Context: T283069: cu_changes auto_increment will hit its max value in wikidatawiki soon

1. ALTERs to run: ALTER TABLE /*_*/cu_changes CHANGE cuc_id cuc_id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT; (from https://gerrit.wikimedia.org/r/692630)
2. Where to run those changes: all.dblist
3. When to run those changes: At any time - It requires master or dc switchover. Writes on it is rather high. Also Wikidata/enwiki will run out of it in a year or two.
4. If the schema change is backwards compatible: Yes
5. If the schema change has been tested already on some of the test/beta wikis: Tested in beta cluster.
6. if the data should be made available on the labs replicas and/or dumps: This table is fully private and under no circumstances it would be okay to replicate it to the cloud.

Progress

• s1
  • eqiad
  • codfw

• s2
  • eqiad
  • codfw

• s3
  • eqiad
  • codfw

• s4
  • eqiad
  • codfw

• s5
  • eqiad T283093#7160372 (only the master pending)
  • codfw

• s6
  • eqiad T283093#7159268 (only the master pending)
  • codfw

• s7
  • eqiad
  • codfw

• s8
  • eqiad
  • codfw

• labswiki
• labtestwiki