MarsSeed [1] filed a deletion request for keepassxc-client-library [2]: Cleanup: obsolete, EOL companion from 2018 to the broken, similarly EOL AUR/keepass-transfer (deletion request PRQ#65945).
Just like in case of the latter, the GitHub repo is archived. [a] [a]: https://github.com/Skycoder42/keepassxc-client-library [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/keepassxc-client-library/
