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backend/models.py

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+import uuid
+from datetime import datetime
+from sqlalchemy import String, Integer, ForeignKey, DateTime, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from sqlalchemy.dialects.postgresql import UUID
+from database import Base
+
+class User(Base):
+    __tablename__ = "users"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    username: Mapped[str] = mapped_column(String, unique=True, nullable=False)
+    email: Mapped[str] = mapped_column(String, unique=True, nullable=False)
+    password_hash: Mapped[str] = mapped_column(String, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now)
+
+    cards: Mapped[list["Card"]] = relationship(back_populates="user")
+    decks: Mapped[list["Deck"]] = relationship(back_populates="user")
+
+
+class Card(Base):
+    __tablename__ = "cards"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    user_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
+    name: Mapped[str] = mapped_column(String, nullable=False)
+    image_link: Mapped[str] = mapped_column(String, nullable=True)
+    card_rarity: Mapped[str] = mapped_column(String, nullable=False)
+    card_type: Mapped[str] = mapped_column(String, nullable=False)
+    text: Mapped[str] = mapped_column(Text, nullable=True)
+    attack: Mapped[int] = mapped_column(Integer, nullable=False)
+    defense: Mapped[int] = mapped_column(Integer, nullable=False)
+    cost: Mapped[int] = mapped_column(Integer, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now)
+
+    user: Mapped["User | None"] = relationship(back_populates="cards")
+    deck_cards: Mapped[list["DeckCard"]] = relationship(back_populates="card")
+
+
+class Deck(Base):
+    __tablename__ = "decks"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
+    name: Mapped[str] = mapped_column(String, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now)
+
+    user: Mapped["User"] = relationship(back_populates="decks")
+    deck_cards: Mapped[list["DeckCard"]] = relationship(back_populates="deck")
+
+
+class DeckCard(Base):
+    __tablename__ = "deck_cards"
+
+    deck_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("decks.id"), primary_key=True)
+    card_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("cards.id"), primary_key=True)
+
+    deck: Mapped["Deck"] = relationship(back_populates="deck_cards")
+    card: Mapped["Card"] = relationship(back_populates="deck_cards")