This file is indexed.

/usr/share/debhelper/autoscripts/postrm-debconf is in debhelper 10.2.5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi