[When calling Log Out via the REST API, I get logged out of Web Site and App.]

I have an automated order script that runs periodically via the REST API.
This logs in, places orders and logs out again.

If I am logged into the phone App, or the Web Site when this script logs out (using the Delete Session via REST API), I get logged out of the Web Site and phone App as well.
Can this bug be fixed as soon as possible please?

[Wall Street spread bet DFB exact underlying market?]

What is the exact underlying market that the Wall Street spread betting DFB market on IG is replicating?

I'm trying to backtest some ideas on this but any price data sources I see don't match the IG prices, not even really that close. 
Is the the E-Mini Dow Future (YM) ? Or some sort of derived  price from the actual DJI index? 

If anyone knows and can also point me to where I can purchase historical 1 min data it would be a big help!