initial

backend/app/models/game.py

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+from datetime import datetime
+from sqlalchemy import String, DateTime, ForeignKey, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+
+
+class Game(Base):
+    __tablename__ = "games"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    marathon_id: Mapped[int] = mapped_column(ForeignKey("marathons.id", ondelete="CASCADE"), index=True)
+    title: Mapped[str] = mapped_column(String(100), nullable=False)
+    cover_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
+    download_url: Mapped[str] = mapped_column(Text, nullable=False)
+    genre: Mapped[str | None] = mapped_column(String(50), nullable=True)
+    added_by_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+    # Relationships
+    marathon: Mapped["Marathon"] = relationship("Marathon", back_populates="games")
+    added_by_user: Mapped["User"] = relationship("User", back_populates="added_games")
+    challenges: Mapped[list["Challenge"]] = relationship(
+        "Challenge",
+        back_populates="game",
+        cascade="all, delete-orphan"
+    )