I need to build tables like in the picture, it turns out to be a very complex structure where I understand what relationships need to be used, but I don’t understand how to do it
example pic

class ChampionshipsTable(Base):
    __tablename__ = "championships"

    id: Mapped[int] = mapped_column(primary_key=True)
    CId: Mapped[int] = mapped_column(Integer(), unique=True)
    championship_name = mapped_column(String(50))


class TournamentsTable(Base):
    __tablename__ = "tournaments"

    id: Mapped[int] = mapped_column(primary_key=True)
    CId: Mapped[int] = mapped_column(ForeignKey("championships.CId"))
    TId: Mapped[int] = mapped_column(Integer(), unique=True)
    tournament_name: Mapped[str] = mapped_column(String(50))

class MatchesTable(Base):
    __tablename__ = "matches"
    
    id: Mapped[int] = mapped_column(primary_key=True)
    CId: Mapped[int] = mapped_column(ForeignKey("championships.CId"))
    TId: Mapped[int] = mapped_column(ForeignKey("tournaments.TId"))
    match_id: Mapped[int] = mapped_column(Integer(), unique=True)

Is there any universal solution?

I try to build tables like in many-to-many example in sqlalchemy like that:

class ChampionshipsTable(Base):
    __tablename__ = "championships"

    id: Mapped[int] = mapped_column(primary_key=True)
    CId: Mapped[int] = relationship("TournamentsTable", secondary="matches", back_populates="championships")
    championship_name = mapped_column(String(50))


class TournamentsTable(Base):
    __tablename__ = "tournaments"

    id: Mapped[int] = mapped_column(primary_key=True)
    CId: Mapped[int] = relationship("ChampionshipsTable", back_populates="tournaments")
    TId: Mapped[int] = relationship("MatchesTable", backref="tournaments")
    tournament_name: Mapped[str] = mapped_column(String(50))

class MatchesTable(Base):
    __tablename__ = "matches"
    
    id: Mapped[int] = mapped_column(primary_key=True)
    CId: Mapped[int] = mapped_column(ForeignKey("championships.id"))
    TId: Mapped[int] = mapped_column(ForeignKey("tournaments.id"))
    match_id: Mapped[int] = mapped_column(Integer(), unique=True)

and thats what i got: sqlalchemy.exc.InvalidRequestError: Mapper 'Mapper[TournamentsTable(tournaments)]' has no property 'championships'. If this property was indicated from other mappers or configure events, ensure registry.configure() has been called.
I dont know what to do