Update customer schedule field and merge session details

Registration webhooks deliver raw session lists that don't merge into customer profiles. Merge schedules into customer records so coordinators can act same day.

Overview

Incoming registration payloads often land raw and disconnected from customer records, forcing coordinators into manual merges and late outreach. This flow consolidates session lists directly into each customer's profile so your enrollment team has attendee context within minutes and can start same-day outreach.