MarsSeed [1] filed a deletion request for postgresql-lts-old-upgrade [2]: Unneeded, abandoned PgSQL upgrade package to migrate the DB from the 1-year EOL v10 to the freshly EOL v11.
Not useful to keep. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/postgresql-lts-old-upgrade/
