Wikibase Registry is now Wikibase World. Learn more on the project talk page.
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Migration from Wikibase Registry
Here is my report on the migration of data from Wikibase Registry to Wikibase World.
First, the reasons why I am doing this to begin with. Wikibase Registry was first set up in 2018, before WBStack or Wikibase.Cloud. It was set up as a one-off Wikibase on a Wikimedia Cloud virtual machine, where it has fallen behind on software updates, including critical security updates. The restrictive approach to editing meant that as Wikibases were created no one was around to update the wiki, causing it to fall behind with reality. And on top of all that, the query service stopped working.
Rather than invest effort in keeping this separate installation of Wikibase online when we have Wikibase.Cloud, I have taken the initiative to move the data to Wikibase.Cloud (under a custom domain name) and update it with present information. I also created a mapping between the wikis that will be used to maintain redirects from the registry to Wikibase World. This means links to entities on the Wikibase Registry will continue to work, provided they have been migrated to the new wiki.
Hopefully this breathes new life into the project. Now that it's easier than ever to create a Wikibase we should also make it easy for people to add theirs to the list.