chore: minor fixes and formatting

db/models/orders.py

@@ -1,8 +1,9 @@
 import enum
-from typing import List, Optional
-from sqlalchemy import ForeignKey, BigInteger
-from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from sqlalchemy import BigInteger, ForeignKey
 from sqlalchemy.dialects.postgresql import ENUM
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
 from db.base import Base
 from db.models.products import Product
 
@@ -19,10 +20,10 @@ class Order(Base):
     __tablename__ = "orders"
 
     id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
-    customer: Mapped[Optional[int]] = mapped_column(BigInteger)
+    customer: Mapped[int | None] = mapped_column(BigInteger)
     status: Mapped[OrderStatus] = mapped_column(ENUM(OrderStatus, name="order_status"))
 
-    items: Mapped[List["OrderItem"]] = relationship("OrderItem", back_populates="order")
+    items: Mapped[list["OrderItem"]] = relationship("OrderItem", back_populates="order")
 
 
 class OrderItem(Base):