initial

backend/app/models/user.py

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+from datetime import datetime
+from sqlalchemy import String, BigInteger, DateTime
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    login: Mapped[str] = mapped_column(String(50), unique=True, nullable=False, index=True)
+    password_hash: Mapped[str] = mapped_column(String(255), nullable=False)
+    nickname: Mapped[str] = mapped_column(String(50), nullable=False)
+    avatar_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
+    telegram_id: Mapped[int | None] = mapped_column(BigInteger, unique=True, nullable=True)
+    telegram_username: Mapped[str | None] = mapped_column(String(50), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+    # Relationships
+    organized_marathons: Mapped[list["Marathon"]] = relationship(
+        "Marathon",
+        back_populates="organizer",
+        foreign_keys="Marathon.organizer_id"
+    )
+    participations: Mapped[list["Participant"]] = relationship(
+        "Participant",
+        back_populates="user"
+    )
+    added_games: Mapped[list["Game"]] = relationship(
+        "Game",
+        back_populates="added_by_user"
+    )