postrm is in mysql-common 5.5.60-0+deb8u1.
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 | #!/bin/bash
set -e
if [ "$1" = "purge" ]; then
rmdir /etc/mysql 2>/dev/null || true
fi
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