Your relationships are set to load via lazyloading ('select') or subqueries
('subquery').
you want to eager load the relationships, which can be done on the mapper
or on a specific query.
see https://docs.sqlalchemy.org/en/latest/orm/loading_relationships.html
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SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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