I think I'm near but I can't finish :
for all the structure : https://dpaste.de/fek5#L
and here my query :
self.session.query(Object).outerjoin(ObjectStatus).outerjoin(Status)\
.group_by(Object).with_entities(Object,
func.max(Status.datum).label("status_datum")).subquery()
self.session.query(Object).join((sub, sub.c.id == Status.id))\
.filter(sub.c.statustype_id > 50)
but status type not reachable.
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