The ebuild seems to be missing SRC_URI arrows to rename the distfile: v9.1.tar.gz
commit d161c241e3fb066ba1d401ace62ff8bbe07ef71a (HEAD -> master, origin/master, origin/HEAD) Author: Aaron W. Swenson <titanofold@gentoo.org> Date: Sun May 28 08:35:21 2017 -0400 dev-db/pgbadger: Use Unique Archive Name The source archive was being downloaded as ‘v(Version Number).tar.gz’ without being renamed to something unique. Now it does.