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fix: handle MappedAsDataclass in create_update_dict - #1575
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Fixes #1440
When a user model uses SQLAlchemy's
MappedAsDataclass, registering a user fails on optional fields becausecreate_update_dictdrops unset values that the dataclass__init__expects as keyword arguments.This keeps
exclude_unset=Truefor partial updates but passesexclude_unset=Falseduring user creation, so default values for optional fields are included.