The [[ https://www.mediawiki.org/wiki/Manual:Actor_table | actor table ]] is live on Toolforge replicas, and it appears the foreign keys (e.g. `rev_actor_id`) are populated.
The effort involved here is to update our queries to join on `actor` when we need to filter by username, or use join decomposition, so that we are no longer referencing `rev_user_text`, `rev_user`, `log_user_text`, `log_user`, etc.
The full list of database changes are listed at T167246.
Affected tools, roughly ordered by difficulty, highest to lowest:
 T223667 - [[ https://xtools.wmflabs.org/ | XTools ]] - @MusikAnimal
 T219328 - [[ https://eventmetrics.wmflabs.org/ | Event Metrics ]] - @MaxSem
[x] [[ https://tools.wmflabs.org/copypatrol | CopyPatrol ]] - @MaxSem
 [[ https://meta.wikimedia.org/wiki/Pageviews_Analysis | Pageviews Analysis ]]
 [[ https://tools.wmflabs.org/userviews/ | Userviews ]]
 [[ https://meta.wikimedia.org/wiki/User:Community_Tech_bot | Community Tech bot ]] (some database reports) - @MaxSem