I confirm what I said.
The run in multiprocessing was regenerating instances because after
deserialization they were getting new IDs. I tried to implement a custom
__hash__ but it seems that SQLAlchemy does not get it.
What I did was disabling the backref cascade for `Satellite` and
`GroundStation` objects and then, after optimization, doing:
for passage in results:
# I need to merge since if coming from multiprocessing the instance
# IDs change.
passage.satellite = session.merge(passage.satellite)
passage.ground_station = session.merge(passage.ground_station)
session.add(passage)
This looks working as expected.
Thanks to Mike and Simon pointing me on the right track!
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