prerm is in freeradius-postgresql 2.1.12+dfsg-1.2ubuntu8.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | #! /bin/sh
set -e
case "$1" in
  remove)
        for file in /etc/freeradius/sql/postgresql/cisco_h323_db_schema.sql \
          /etc/freeradius/sql/postgresql/counter.conf \
          /etc/freeradius/sql/postgresql/dialup.conf \
          /etc/freeradius/sql/postgresql/ippool.conf \
          /etc/freeradius/sql/postgresql/ippool.sql \
          /etc/freeradius/sql/postgresql/nas.sql \
          /etc/freeradius/sql/postgresql/schema.sql \
          /etc/freeradius/sql/postgresql/update_radacct_group_trigger.sql \
          /etc/freeradius/sql/postgresql/voip-postpaid.conf
        do
          if dpkg-statoverride --list $file >/dev/null; then
            dpkg-statoverride --remove $file
          fi
        done
        for dir in /etc/freeradius/sql \
          /etc/freeradius/sql/postgresql
        do
          if dpkg-statoverride --list $dir >/dev/null; then
            dpkg-statoverride --remove $dir
          fi
        done
	;;
esac
exit 0
 |