That's strange. Debian package 'postfix-policyd' will initial SQL database automatically, iRedMail doesn't do it.
Anyway, you can find SQL template file under /usr/share/dbconfig-common/data/postfix-policyd/, or download the latest one (version 1.82, not 2.x) here: http://www.policyd.org/content/download then extract the SQL template file.
