td ameritrade acquired by schwab, how to handle updating accounts in MINT?

There seems to be no answer to this question yet. Found a circular link on the Turbo Tax help, but nothing. 

 

How can I update the account access without creating duplicates or deleting my historical data with TD Ameritrade? 

 

I have a new login from Schwab (required), which access the same accounts. Everything was transferred over.  Can I keep the historical data and simply rename the accounts and reset the login to be that of Schwab? 

 

HELP!!