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class Group(SQLModel, table=True): """Group Model""" id: Annotated[int | None, Field(primary_key=True)] = None name: Annotated[str, Field(index=True, description="Name of the group")] # Error # heroes: Annotated[list["Hero"], Relationship(back_populates="group")] = [] heroes: list["Hero"] = Relationship(back_populates="group")