- migrations/021: notification_events (queued/sending/sent/failed/cancelled, bounded
exponential backoff via attempt_count/next_attempt_at, a classified last_error_code, never a
raw stack trace or provider credential).
- notifications.js: enqueue (records a no-recipient case as already-failed rather than
silently dropping it), claimNext (FOR UPDATE SKIP LOCKED — safe if two worker processes ever
run), markSent/markFailedOrRetry (bounded retry, terminal-state token scrubbing),
notifyForEnrollment (the shared activation-vs-confirmation decision every enrollment-creation
path calls), maskEmail/toAdminView (the only shapes any admin API ever returns).
- enrollment.js: enrollmentContactEmail() — reads back the minor/no-email transitional
contact-email convention (stored in the existing enrollments.metadata JSONB, never written to
students.email) that createFromIntegrationEvent/createManualEnrollment now accept.
