Reason:
The installation has been failing since MediaWiki 1.23 which added the page_links_updated column in the database. 1.23 got released in June 2014. The extension is not installable indicating that nobody tried installing it.
Wikiapiary shows zero installation https://wikiapiary.com/wiki/Extension:InterwikiIntegration
- Archive documentation on mediawiki.org ( https://www.mediawiki.org/wiki/Extension:InterwikiIntegration )
- Remove from mediawiki/extensions ( along with in .gitmodules)
- Remove tests in integration/config ( zuul/layout.yaml )
- Remove from translatewiki ( groups/MediaWiki/mediawiki-extensions.txt )
- Empty repository and add a OBSOLETE file.
- Archive the extension's diffusion repository: ( https://phabricator.wikimedia.org/diffusion/EIWI/ )
- Mark the repository read-only in Gerrit: ( https://gerrit.wikimedia.org/r/#/admin/projects/mediawiki/extensions/InterwikiIntegration )
- Delete the GitHub mirror: https://github.com/wikimedia/mediawiki-extensions-InterwikiIntegration