The cupe_actor column of the cu_private_event table was made nullable to prevent the need to acquire an actor ID for an IP address when temporary accounts are enabled. This was recommended over using a new table by @Ladsgroup in T359309#9615111.
- ALTERs to run: https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/CheckUser/+/0aafa1d1d990f6cabccf67e339ea46d360cdb158/schema/mysql/patch-cu_private_event-modify-cupe_actor-nullable.sql
- Where to run those changes: all
- When to run those changes: Ideally sooner than later as this blocks a testwiki deploy of temporary accounts
- If the schema change is backwards compatible: Yes.
- If the schema change has been tested already on some of the test/beta wikis: checkuser is not on beta cluster but has been deployed on a mwvagrant instance on https://checkuser-beta-wiki.wmcloud.org
- If the data should be made available on the labs replicas and/or dumps: Everything is private
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