RootCauseunvalidated

The API schema is using the same SQLModel database model for serialization, so Pydantic follows the field type (`list[Category]`) and emits full `Category` objects instead of deriving strings.

98392b79-14e3-480f-a62d-69f0e72f2cf6

The API schema is using the same SQLModel database model for serialization, so Pydantic follows the field type (list[Category]) and emits full Category objects instead of deriving strings.