Initial commit for shift push notification reminders

supabase/migrations/20260318_add_scheduled_notifications.sql

@@ -0,0 +1,75 @@
+-- Migration: add scheduled_notifications queue and enqueue function for shift reminders
+-- Creates a queue table and stored procedure to enqueue 15-minute and end-of-shift reminders
+
+CREATE EXTENSION IF NOT EXISTS pgcrypto;
+
+-- Queue table for scheduled notifications
+CREATE TABLE IF NOT EXISTS public.scheduled_notifications (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  schedule_id uuid NOT NULL REFERENCES public.duty_schedules(id) ON DELETE CASCADE,
+  user_id uuid NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+  notify_type text NOT NULL, -- 'start_15' | 'end'
+  scheduled_for timestamptz NOT NULL,
+  created_at timestamptz NOT NULL DEFAULT now(),
+  processed boolean NOT NULL DEFAULT false,
+  processed_at timestamptz,
+  retry_count int NOT NULL DEFAULT 0,
+  last_error text
+);
+
+CREATE INDEX IF NOT EXISTS idx_scheduled_notifications_scheduled_for ON public.scheduled_notifications(scheduled_for);
+CREATE INDEX IF NOT EXISTS idx_scheduled_notifications_processed ON public.scheduled_notifications(processed);
+
+-- Ensure uniqueness per schedule/user/notify type
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_constraint c
+    JOIN pg_class t ON c.conrelid = t.oid
+    WHERE c.conname = 'uniq_sched_user_type' AND t.relname = 'scheduled_notifications'
+  ) THEN
+    ALTER TABLE public.scheduled_notifications ADD CONSTRAINT uniq_sched_user_type UNIQUE (schedule_id, user_id, notify_type);
+  END IF;
+END$$;
+
+-- The project already has notification_pushes and try_mark_notification_pushed (see earlier migrations).
+
+-- Enqueue function: finds duty_schedules in the configured windows and inserts into queue.
+CREATE OR REPLACE FUNCTION public.enqueue_due_shift_notifications()
+RETURNS void LANGUAGE plpgsql AS $$
+DECLARE
+  rec RECORD;
+BEGIN
+  -- 15-minute-before reminders
+  FOR rec IN
+    SELECT id AS schedule_id, user_id AS user_id, start_time AS start_at
+    FROM public.duty_schedules
+    WHERE start_time BETWEEN now() + interval '15 minutes' - interval '30 seconds' AND now() + interval '15 minutes' + interval '30 seconds'
+      AND status = 'active'
+  LOOP
+    -- Skip if user already checked in for this duty (attendance_logs references duty_schedule_id)
+    IF EXISTS (SELECT 1 FROM public.attendance_logs al WHERE al.duty_schedule_id = rec.schedule_id AND al.check_in_at IS NOT NULL) THEN
+      CONTINUE;
+    END IF;
+
+    INSERT INTO public.scheduled_notifications (schedule_id, user_id, notify_type, scheduled_for)
+    VALUES (rec.schedule_id, rec.user_id, 'start_15', rec.start_at)
+    ON CONFLICT (schedule_id, user_id, notify_type) DO NOTHING;
+  END LOOP;
+
+  -- End-of-shift reminders (near exact end)
+  FOR rec IN
+    SELECT id AS schedule_id, user_id AS user_id, end_time AS end_at
+    FROM public.duty_schedules
+    WHERE end_time BETWEEN now() - interval '30 seconds' AND now() + interval '30 seconds'
+      AND status = 'active'
+  LOOP
+    INSERT INTO public.scheduled_notifications (schedule_id, user_id, notify_type, scheduled_for)
+    VALUES (rec.schedule_id, rec.user_id, 'end', rec.end_at)
+    ON CONFLICT (schedule_id, user_id, notify_type) DO NOTHING;
+  END LOOP;
+END;
+$$;
+
+-- NOTE: Schedule this function with pg_cron or your Postgres scheduler. Example (requires pg_cron extension enabled):
+-- SELECT cron.schedule('shift_reminders_every_min', '*/1 * * * *', $$SELECT public.enqueue_due_shift_notifications();$$);