initial

backend/app/models/marathon.py

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+from datetime import datetime
+from enum import Enum
+from sqlalchemy import String, Text, DateTime, ForeignKey, Integer
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+
+
+class MarathonStatus(str, Enum):
+    PREPARING = "preparing"
+    ACTIVE = "active"
+    FINISHED = "finished"
+
+
+class Marathon(Base):
+    __tablename__ = "marathons"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    title: Mapped[str] = mapped_column(String(100), nullable=False)
+    description: Mapped[str | None] = mapped_column(Text, nullable=True)
+    organizer_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"))
+    status: Mapped[str] = mapped_column(String(20), default=MarathonStatus.PREPARING.value)
+    invite_code: Mapped[str] = mapped_column(String(20), unique=True, nullable=False, index=True)
+    start_date: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+    end_date: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+    # Relationships
+    organizer: Mapped["User"] = relationship(
+        "User",
+        back_populates="organized_marathons",
+        foreign_keys=[organizer_id]
+    )
+    participants: Mapped[list["Participant"]] = relationship(
+        "Participant",
+        back_populates="marathon",
+        cascade="all, delete-orphan"
+    )
+    games: Mapped[list["Game"]] = relationship(
+        "Game",
+        back_populates="marathon",
+        cascade="all, delete-orphan"
+    )
+    activities: Mapped[list["Activity"]] = relationship(
+        "Activity",
+        back_populates="marathon",
+        cascade="all, delete-orphan"
+    )