hi. 
i have a sort-of multicolumn m2m association table, where the primary 
key is composed of all the links. At least 1 link (actualy, 2) is 
always present, but never all. so i am defining all of those columns 
with primary_key=True, nullable=True.
which is fine in sqlite, but doesnot work in postgres - it 
autoincrements those columns without value.

how can i fix this? 
would a default_value=0 - or something - work?

(now as i look at it, at least as declaration, the whole primary key 
seems nullable - is this wrong?)

ciao
svil

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