Upsert People before RSVP Sync [3]

[aguestuser]

Acceptance Criteria

GIVEN an event sync has just been triggered:

• THEN the service will determine which of the People records included in the Event's RSVPs already exist in VAN
• AND the service will not proceed with the sync until it has finished checking the status of all people

GIVEN a response to the above request for the status of rsvp'ed people has returned:

• WHEN the person already exists in VAN
  • THEN the service will record that fact, along with their VAN id
• WHEN an RSVP'ed person does not already exist in VAN
• THEN the service will record that fact
• WHEN all people have been inspected
  • THEN the service will issue a request to create all the people who did not yet exist in VAN
  • AND record the VAN ids of newly created people as they return
  • AND handle failure appropriately

GIVEN the above process has completed and all people have been rectified:

• THEN the RSVP sync process will begin

[aguestuser]

closing as ill-drawn and duplicative of work folded into #3