[Dovecot] problem with proxy setup

[Claus]

Hi all,

i have some troubles in the implementation of my proxyconfiguration.
i have two kind of users, the first will be proxied to a dovecot backend 
with masteruser-login, the other one will be proxied to another 
non-dovecot imapserver with nopassword.
Everything looks to work if i use  passwd-file like this:

user1:{PLAIN}pass1:::::::proxy=y host=192.168.1.1 
destuser=user1*masteruser pass=masterpass
user2::::::::nopassword proxy=y host=192.168.2.2

In an second step i try the same behavior with sql (postgresql), but 
there are my problems.
In my thinking, the sql query should return the right fields (in 
passwd-file) like proxy, host, ..
but whats the trick, to get only the  correct fields i need for the 
different funktions?
first proxy, host, destuser, pass and on the other side nopassword, 
proxy and host.

Maybe i have mistakes in reasoning, but in sql i get in one query always 
the same fields.

I hope someone can give me some hints an tricks.

thanks, Claus