/usr/share/doc/openssh-known-hosts/examples/psql is in openssh-known-hosts 0.6.2-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 | PLUGIN=psql
# from psql(1): psql returns 2 if the connection to the server went bad and
# the session was not interactive
EXIT_IGNORE=2
PGHOST=db.example.com
PGDATABASE=exampledb
PGSSLMODE=verify-full
PGSSLROOTCERT=/etc/ssl/certs/examplerootcert
PGUSER=exampleuser
PGPASSWORD=foobar # beware: will be readable from /proc/<pid>/environ, better:
PGPASSFILE=/path/to/.pgpass
TABLE=known_hosts
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