Model

• store: id, name, operator, location, address
• item_price: id, store_visit, item_id, price
• store_visit: id, user_id, store_id, date, time
• item: id, name, size, organic (boolean), size_unit ('lb', 'oz', 'g', 'kg', 'fl oz', 'pints', 'gallons', 'cups', 'count')