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K1 Acquires Mariadb
(www.prnewswire.com)
This is a most excellent place for technology news and articles.
As someone who self-hosted it, I can't say this is true.
https://docs.nextcloud.com/server/latest/admin_manual/configuration_database/linux_database_configuration.html
Huh. I figured they changed to PG since that's what their AIO image is using, and having used both myself in regular baremetal installs, postgres is by far the better performing backend.