How many times have you downloaded the same time series data to backtest a trading strategy? If you’re like silly old me – too many times…or at least enough times to write about it! — You might say that most APIs like yfinance are fast and easy to use so it’s no biggie. Granted, that is mostly the case. It does escalate from a minor inconvenience to a serious pain in the proverbial though if you want to do a deep dive into minute intervals…