When inheriting a DTO factory class, there is no way to merge the config of the inherited type with a config defined on the new class.

One idea is to have a callback method on AbstractDTO that handles the case where a 2nd config object is found in the mro of the DTO type.. something like:

class AbstractDTO:
    ...

    @staticmethod
    def merge_configs(old: DTOConfig, new: DTOConfig) -> DTOConfig:
        return new

Default would just return the latest one, which would preserve current overwrite behavior, but then you could do something like:

class MyDTO(PydanticDTO[...]):
    ...

    @staticmethod
    def merge_configs(old: DTOConfig, new: DTOConfig) -> DTOConfig:
        new.rename.update(old.rename)
        return new