To keep the topic together, I decided to add my question to this as well, regarding historical data handling.

1 - How are series handled when a split occurred overnight?
2 - Is it better to store the historical data as adjusted or unadjusted? And if we adjust it after a split, we basically need to retrain everything, correct?
3 - Some brokers will cancel any open stop/profit orders after a split occurs (e.g. IB). I imagine we have to manually detect that and re-issue those orders?