I have noticed that when I am running live before the market opens and collect pre-open data, when I back fill from IB to ensure that my database is up to date is overwrites the data I collected. What is happening?
This is an example of what is happening. This morning I was using IBs paper trading account. When I closed the account to get ready for the day, I saved the pre-market data before I closed the paper account. When I opened my real account and backfilled the symbols it deleted all the data I had collected up to that point for this day only even though I had saved it. Everything before the backfill was gone. Whose bug is this? IBs or ABs? How can I prevent it? I want to keep the pre-open data especially for the futures. How do I? Thanks, Barry
