Florian [1] filed a deletion request for libnotify-id-git [2]: The patch was merged upstream 2 months ago [1] and is included in the 0.7.10 release of libnotify. As libnotify 0.7.12 is already available in the Arch repos, this package is redundant.
[1] https://gitlab.gnome.org/GNOME/libnotify/-/commit/652b4d6911e95adba15d3efddce08364a925877a [1] https://aur.archlinux.org/account/Florian/ [2] https://aur.archlinux.org/pkgbase/libnotify-id-git/