How to integrate with Drupal migrate to create a periodic import into CiviCRM?
I would expect 2/ ie https://github.com/eileenmcnaughton/civimigrate which we have made lots of use off for migrating legacy data. From memory we have one situation where client can 'click a switch' to run a migration to pull in latest data. I will flick a note to eileen to see if she can expand