A recent Wikibase email list post on the topic of Wikibase and bulk imports caused me to write up a mostly human readable version of what happens, in what order, and when, for Wikibase action API edits, for the specific case of item creation.
There are a fair few areas that could be improved and optimized for a bulk import use case in the existing APIs and code. Some of which are actively being worked on today (T285987). Some of which are on the roadmap, such as the new REST APIs for Wikibase. And others which are out there, waiting to be considered.
This post is is written looking at Wikibase and MediaWiki 1.36 with links to Github for code references. Same areas may be glossed over or even slightly inaccurate, so take everything here with a pinch of salt.
Reach out to me on Twitter if you have questions or fancy another deep dive.
Many users of Wikibase find themselves in a position where they need to change the concept URI of an existing Wikibase for one or more reasons, such as a domain name update or desire to have https concept URIs instead of HTTP.
Below I walk through a minimal example of how this can be done using a small amount of data and the Wikibase Docker images. If you are not using the Docker images the steps should still work, but you do not need to worry about copying files into and out of containers or running commands inside containers.
I recently updated updated the Wikibase registry from Mediawiki version 1.30 to 1.31 and described the process in a recent post, so if you want to see what the current setup and docker-compose file looks like, head there.
As a summary the Wikibase Registry uses:
The wikibase/wikibase:1.31-bundle image from docker hub