Reactive silent producer. Listens to calendar.created + calendar.updated events; for each fired event builds the cheap pre-summarized rollup the alert recipe consumes. Writes calendar_event_rollup keyed on event_id with a deterministic brief (event summary + attendee count + start_at) plus the canonical attendee list. Dependent policy means deletion of the underlying event cascades the rollup automatically. The full attendee-pattern fold (which would walk timeline-read for each participant) deepens in D-124 housekeeping; this v1 producer keeps the rollup fresh for every newly-created or modified event.

How it works 5 steps

Inspect the data fetches, transforms, gates, and output this recipe runs.

Process (5 steps)

■ attendee_emails pluck

Extract email from each item

■ attendee_count count

Count items in attendee emails

■ brief template

Generate text from a template

■ upsert ?

■ card to_summary

Format results as a summary card