Fix MappedAnnotationError

✅ Solution

MappedAnnotationError usually arises when SQLAlchemy cannot infer the database column type from a Python type annotation. Ensure your model attribute has a well-defined `sqlalchemy.Column` with an explicit `sqlalchemy.types` type (e.g., `sqlalchemy.Integer`, `sqlalchemy.String`) or use `Mapped[SomeType]` alongside a corresponding SQLAlchemy type in the column definition to guide SQLAlchemy.