Add relationship() with back_populates for SQLAlchemy models (issue #47) #77
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- Add new `relationships` parameter to `create_models()` function
- Generate bidirectional relationships with `back_populates` for foreign keys
- Support both `sqlalchemy` and `sqlalchemy_v2` model types:
- For sqlalchemy: uses `relationship("Model", back_populates="attr")`
- For sqlalchemy_v2: uses `Mapped[List["Model"]]` and `Mapped["Model"]` type hints
- Add `collect_relationships()` function to gather FK relationships from tables
- Handle both inline FK references and ALTER TABLE FK definitions
- Add functional and integration tests for both model types
- Update CHANGELOG with new feature documentation
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relationshipsparameter tocreate_models()functionback_populatesfor foreign keyssqlalchemyandsqlalchemy_v2model types:relationship("Model", back_populates="attr")Mapped[List["Model"]]andMapped["Model"]type hintscollect_relationships()function to gather FK relationships from tables