Cart rendering, bug fixes with cart adding/rming

db/models/orders.py

@@ -4,6 +4,7 @@ from sqlalchemy import ForeignKey, BigInteger
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 from sqlalchemy.dialects.postgresql import ENUM
 from db.base import Base
+from db.models.products import Product
 
 
 class OrderStatus(enum.Enum):
@@ -33,3 +34,4 @@ class OrderItem(Base):
     quantity: Mapped[int] = mapped_column(default=1)
 
     order: Mapped["Order"] = relationship("Order", back_populates="items")
+    product: Mapped["Product"] = relationship("Product")