Unfortunately the server holds values of zero because we did not record data at that time - this cannot be changed.
Can you please try changing the rollover date to a different date and subsequently enter your own offset value as a workaround.
You could import all historical data from different expiries in a continuous contract (##-##) as well, however it will not be backadjusted.
So you would export all historical data for each expiry. Rename the .txt file to ES ##-##.Last.txt. Make sure you added the ES ##-## to your instrument list and import the renamed .txt file.
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