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Backend (school-service):
- notification_log table with UNIQUE(event_id, lead_days, audience,
channel) for idempotent re-runs. Status enum sent/failed/skipped.
- internal/notifications/templates.go: per-event-type × audience ×
lead-day-bucket × language templates in 8 languages (de/en/tr/ar/
uk/ru/pl/fr). Fallback chain (lang→de, eventType→andere) so we
never miss a render.
- service.go scans cal_school_event for events whose
(start_date - runDate) appears in notification_lead_days. For each
due (audience, channel) tuple it dispatches via POST to the
Matrix/Email upstreams owned by the colleague's services.
Empty URL → status='skipped', logged for visibility.
- dispatcher.go handles the POST, parent-recipient lookup (joins
parent_account + parent_child + cal_school_event.affected_class_ids),
and writeLog with the unique constraint dropping duplicate runs.
- main.go runs a 1-hour ticker; when time.Hour()==6 it invokes the
scanner for today. Idempotent so transient restarts don't double-
send.
- POST /calendar/notifications/run-now for manual trigger + backfill
(?date=YYYY-MM-DD).
- GET /calendar/events/:id/notifications returns notification_log
rows scoped to the owning teacher.
- MATRIX_SERVICE_URL + EMAIL_SERVICE_URL env vars added (default
empty = stub mode).
Frontend (studio-v2):
- NotificationStatus component fetches /events/:id/notifications and
renders coloured badges per (lead, audience, channel, status).
- DayDetail mounts NotificationStatus inside each event card when
notify_parents or notify_students is set.
Tests:
- 6 new Go unit tests for bucketFor + Render (de/tr/fallback paths)
+ substitute(class_suffix). 89 subtests gesamt.
- 2 new Playwright tests: badge render with mocked log, hidden when
notifications are off.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>