invoices, order handling, db updates

db/models/__init__.py

@@ -1,4 +1,13 @@
 from .orders import Order, OrderItem, OrderStatus
 from .products import Product, Category
+from .invoices import Invoice, InvoiceStatus
 
-__all__ = ["Order", "OrderItem", "OrderStatus", "Product", "Category"]
+__all__ = [
+    "Order",
+    "OrderItem",
+    "OrderStatus",
+    "Product",
+    "Category",
+    "Invoice",
+    "InvoiceStatus",
+]