Sequence Engine Patterns

Apply when adding automated follow-up sequences.

Design using SequenceEngine (lib/services/ops/SequenceEngine.js) patterns:

1. •What triggers it? (srf.created, job.completed, booking_failed, etc.)
2. •What stops it? (which receipt statuses cancel the sequence?)
3. •How many steps? What channel for each? (sms, voice, email)
4. •What delay between steps? (minutes, hours, days)
5. •What template for each step? (add to SEQUENCE_TEMPLATES in SequenceEngine.js)
6. •What pre-send checks? (receipt status, opt-out, rate limit, quiet hours)
7. •Where does it start? (function-handlers.js createServiceRequest, vapi-webhook end-of-call, or ops-scheduler cron?)

Existing templates: NEW_LEAD, QUOTE_SENT, SCHEDULED_REMINDER, POST_JOB, LINK_FOLLOWUP. Follow the same { delay, action, template } step format.