[Zope-dev] Product refresh causes database connections leaking

I'm developing a product (based on SimpleUserFolder), which adds a folder with some ZSQL methods to itself on instanciation. The ZSQL methods use a database adapter (Z Psyco DA 1.1.3, symptoms occur also with older versions). After some time things went awry, because the DA had lost its connection to the database and couldn't reconnect, because the max connections postgres would allow were used. Now I think I found the cause, because everytime I refresh my product, and the ZSQL Methods are used, the number of connections to postgres grows by 4. Anybody knows what exactly is to blame, zope's refresh procedure or the database adapter? cheers, oliver