Notify ahead of each upcoming meeting at -3d / -1d / -3h with a short brief grounded in the meeting's context and the attendees' behavioral patterns (reschedule history etc.). Dispatches via your configured channels; never re-fires the same event + offset.

Record a per-contact meeting-reschedule pattern whenever an event's start time actually changes (title-only edits don't fire) — the behavioral signal time-alert-before-event reads for its briefs.

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.

Reactive silent producer. Listens to mail.created events; extracts the sender's email and stamps a contact_timeline_rollup enrichment with the latest interaction signal. Aggregate-policy upsert keyed on contact email. D-122 ships the cheap deterministic fields only — interaction_count seeded at 1, last_interaction set, recent_subjects single-element. The fuller fold (rolling window, attendee co-occurrence, thread-aware subject deduplication) ships in D-124 housekeeping once timeline-read becomes the producer's primary input. Calendar-side contact contributions also defer to the housekeeping pass.