This file is indexed.

prerm is in postgresql-doc-10 10.3-1.

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.

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#!/bin/sh

set -e

VERSION=${DPKG_MAINTSCRIPT_PACKAGE##*-}

if [ "$1" = remove ]; then
    if [ -f /usr/share/postgresql-common/maintscripts-functions ]; then
        . /usr/share/postgresql-common/maintscripts-functions
        remove_doc_version $VERSION
    else
        update-alternatives --remove SPI_connect.3.gz \
            /usr/share/postgresql/$VERSION/man/man3/SPI_connect.3.gz
    fi
fi