MarsSeed [1] filed a deletion request for systemd-light [2]: Package has been unmaintained for 2 years. It is unclear how it is different from Arch/core/systemd. Plenty of alternative builds exist that are up-to-date. Safe to delete, there is nothing that requires the "systemd-light" package specifically.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/systemd-light/
