Stories

o-1002 is paid (two green teas, one biscotti); cancelling it puts them back.

Categories nest, products know their margin and whether they're running low, and each comes from a supplier.

An order belongs to a customer and adds up its lines.

Paying o-1003 takes one pour-over cone and one decaf off stock, once.

The categories, suppliers, products, customers and orders the demo starts with (o-1002 is paid, so its stock is already taken).