sboagibm

## Describe the bug For the `@dataobject` decorator, you loose the tool-time ability to have typing on the dataobject class, because the way the decorator is typed, with `Type[DataBase]` hides...

**What this PR does / why we need it**: Improve prediction endpoint Swagger/OpenAPI generation such that (this is a checklist of intentions): - [x] defaults dataclass-style are observed (via "__dataclass_fields_stashed__")...