Take ES 09-20 and 12-20 as an example:
After "Tools" and Rollovered of futures instruments (ie, my ES 09-20 charts changed to ES 12-20 automatically), does it hurt (ie, corrupting the database) to
1. download the ES 09-20 Historical Data?
2. download the ES 09-20 and ES 12-20 Market Replay data?
Any suggestions will be very much appreciated!
Thanks in advance!
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