Add shop

backend/app/models/inventory.py

@@ -0,0 +1,39 @@
+from datetime import datetime
+from sqlalchemy import DateTime, ForeignKey, Integer, Boolean
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from typing import TYPE_CHECKING
+
+from app.core.database import Base
+
+if TYPE_CHECKING:
+    from app.models.user import User
+    from app.models.shop import ShopItem
+
+
+class UserInventory(Base):
+    __tablename__ = "user_inventory"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
+    item_id: Mapped[int] = mapped_column(ForeignKey("shop_items.id", ondelete="CASCADE"), nullable=False, index=True)
+    quantity: Mapped[int] = mapped_column(Integer, default=1)
+    equipped: Mapped[bool] = mapped_column(Boolean, default=False)
+    purchased_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    expires_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+
+    # Relationships
+    user: Mapped["User"] = relationship(
+        "User",
+        back_populates="inventory"
+    )
+    item: Mapped["ShopItem"] = relationship(
+        "ShopItem",
+        back_populates="inventory_items"
+    )
+
+    @property
+    def is_expired(self) -> bool:
+        """Check if item has expired"""
+        if self.expires_at is None:
+            return False
+        return datetime.utcnow() > self.expires_at