postrm is in dbconfig-common 2.0.9.
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 | #!/bin/sh
set -e
if [ $1 = "purge" ]; then
	rm -f /etc/dbconfig-common/config || true
  if which ucf >/dev/null 2>&1; then
    ucf -p /etc/dbconfig-common/config
    ucfr -p dbconfig-common /etc/dbconfig-common/config
  fi
	# purge the various default logfile/logdir locations
	rm -f /var/log/dbconfig-common/dbc.log
  for d in /etc /var/log /var/lib; do
    if [ -d "$d/dbconfig-common" ]; then
	    rmdir --ignore-fail-on-non-empty "$d/dbconfig-common" 
    fi
  done
fi
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
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