I found only a thread, without answers, in the forum archive.

The new POL version can use external user repositories, for example an LDAP server or a SQL database?

Between in-game accounts, web site staff accounts, project management web site accounts, there are too many passwords around

Still no answers, I think it is "no"

?

there is an sql.em but no content yet, its on the devs TODO so not yet possible

Ok, I'll develop some provisioning system from accounts.txt to external databases....