I've got a bunch of data in Zoho CRM.

By some reason I'd like to make some historic Calls be related to another Contacts.

I.e.

Call with ID=zcrm_0...x relates to Contact_1 with ID zrcm_0...1 (or even has no related Contact at all)

should be changed to

Call with ID=zcrm_0...x relates to Contact_2 with ID zrcm_0...2 

I'm totally novice to Deluge and Zoho so I'm looking for the way to do this trick via some portion of code in Deluge.

Could you, please, tell me if this is The Way or just a dead-end? 

Thank you in advance.