Support automatic SQL NOT_NULL via std::optional. Each type in an entity class should automatically be "NOT_NULL". If wrapped with an std::optional the constraint is removed so that SQL NULL is possible. This should also apply for belongs_to and has_one.
Support automatic SQL NOT_NULL via std::optional. Each type in an entity class should automatically be "NOT_NULL". If wrapped with an std::optional<Type> the constraint is removed so that SQL NULL is possible. This should also apply for ```belongs_to``` and ```has_one```.
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Support automatic SQL NOT_NULL via std::optional. Each type in an entity class should automatically be "NOT_NULL". If wrapped with an std::optional the constraint is removed so that SQL NULL is possible. This should also apply for
belongs_toandhas_one.