Explore and document nullable field behavior for READ DTOs#150

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Ckk3 wants to merge 3 commits intogazorby:mainfrom

Ckk3:sqlalchemy-model-nullable-dont-apply

Commits on Jan 11, 2026

feat: add NullableTestModel and related GraphQL types with nullable field styles
Ckk3
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Merge remote-tracking branch 'origin/main' into sqlalchemy-model-nullable-dont-apply
Ckk3
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refactor: update type hints for nullable fields in models and tests
Ckk3
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