On Fri, May 8, 2020 at 3:01 PM Brooke Storm bstorm@wikimedia.org wrote:
No, the wikireplicas are read-only.
There is slightly more context for this restriction in the blog post that announced the "new" Wiki Replicas databases in 2017 [0].
The prior generation of Wiki Replica databases did allow arbitrary table creation by users. This was both a powerful feature and a cause of pain for system administration. User created tables were not replicated across the cluster which meant that when system maintenance was performed tables or data would mysteriously vanish from the point of view of the user if traffic was routed to a different backend server. Data would also be irretrievably lost when a server experienced major system failures. It was a difficult decision for the Cloud Services and DBA teams to make to remove this useful feature, but doing so has allowed much greater ease of administration and by extension better availability and less replication drift issues for the wiki databases than was possible with the feature in place.
[0]: https://phabricator.wikimedia.org/phame/post/view/70/new_wiki_replica_server...
Bryan