I just tried to get Siremis working with postgres. First I had problems because I created the table and columns with uppercase letters and the behaviour of mysql and postgres is different in this aspect so the Siremis queries weren't successful.

Now I created the user access table the following way:

CREATE TABLE ob_users ( sysid serial NOT NULL, userid varchar(15) NOT NULL, password varchar(15) default NULL, PRIMARY KEY (sysid) );

I also modified Config.xml:

Driver="Pdo_Pgsql" instead of Driver="Pdo_Mysql"

and Siremis seems to work fine with postgres.

cheers, karl heinz