refactor: remove obsolete member management API module

apps/web/supabase/migrations/20260418000001_waitlist_management.sql

@@ -0,0 +1,146 @@
+-- =====================================================
+-- Waitlist Management
+--
+-- A) Course cancellation with automatic waitlist promotion
+-- B) Event cancellation with automatic waitlist promotion
+--
+-- When an enrolled/confirmed participant is cancelled,
+-- the oldest waitlisted entry is atomically promoted.
+-- =====================================================
+
+-- -------------------------------------------------------
+-- A) Course waitlist promotion
+-- -------------------------------------------------------
+
+CREATE OR REPLACE FUNCTION public.cancel_course_enrollment(p_participant_id uuid)
+RETURNS jsonb
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path = ''
+AS $$
+DECLARE
+  v_participant record;
+  v_course record;
+  v_promoted_id uuid;
+  v_promoted_name text;
+BEGIN
+  -- Lock participant
+  SELECT * INTO v_participant
+  FROM public.course_participants
+  WHERE id = p_participant_id
+  FOR UPDATE;
+
+  IF v_participant IS NULL THEN
+    RAISE EXCEPTION 'Teilnehmer nicht gefunden'
+      USING ERRCODE = 'P0002';
+  END IF;
+
+  -- Lock course
+  SELECT * INTO v_course
+  FROM public.courses
+  WHERE id = v_participant.course_id
+  FOR UPDATE;
+
+  -- Cancel
+  UPDATE public.course_participants
+  SET status = 'cancelled'::public.enrollment_status,
+      cancelled_at = now()
+  WHERE id = p_participant_id;
+
+  -- If was enrolled (not already waitlisted/cancelled), promote oldest waitlisted
+  IF v_participant.status = 'enrolled' THEN
+    UPDATE public.course_participants
+    SET status = 'enrolled'::public.enrollment_status
+    WHERE id = (
+      SELECT id FROM public.course_participants
+      WHERE course_id = v_participant.course_id
+        AND status = 'waitlisted'
+      ORDER BY enrolled_at ASC
+      LIMIT 1
+      FOR UPDATE SKIP LOCKED
+    )
+    RETURNING id, first_name || ' ' || last_name
+      INTO v_promoted_id, v_promoted_name;
+  END IF;
+
+  RETURN jsonb_build_object(
+    'cancelled_id', p_participant_id,
+    'promoted_id', v_promoted_id,
+    'promoted_name', v_promoted_name
+  );
+END;
+$$;
+
+GRANT EXECUTE ON FUNCTION public.cancel_course_enrollment(uuid) TO authenticated;
+GRANT EXECUTE ON FUNCTION public.cancel_course_enrollment(uuid) TO service_role;
+
+-- -------------------------------------------------------
+-- B) Event registration cancellation + waitlist promotion
+-- -------------------------------------------------------
+
+-- Add updated_at column if not present
+ALTER TABLE public.event_registrations
+  ADD COLUMN IF NOT EXISTS updated_at timestamptz DEFAULT now();
+
+CREATE OR REPLACE FUNCTION public.cancel_event_registration(p_registration_id uuid)
+RETURNS jsonb
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path = ''
+AS $$
+DECLARE
+  v_registration record;
+  v_event record;
+  v_promoted_id uuid;
+  v_promoted_name text;
+BEGIN
+  -- Lock registration
+  SELECT * INTO v_registration
+  FROM public.event_registrations
+  WHERE id = p_registration_id
+  FOR UPDATE;
+
+  IF v_registration IS NULL THEN
+    RAISE EXCEPTION 'Anmeldung nicht gefunden'
+      USING ERRCODE = 'P0002';
+  END IF;
+
+  -- Lock event
+  SELECT * INTO v_event
+  FROM public.events
+  WHERE id = v_registration.event_id
+  FOR UPDATE;
+
+  -- Cancel
+  UPDATE public.event_registrations
+  SET status = 'cancelled',
+      updated_at = now()
+  WHERE id = p_registration_id;
+
+  -- If was confirmed or pending, promote oldest waitlisted
+  IF v_registration.status IN ('confirmed', 'pending') THEN
+    UPDATE public.event_registrations
+    SET status = 'confirmed',
+        updated_at = now()
+    WHERE id = (
+      SELECT id FROM public.event_registrations
+      WHERE event_id = v_registration.event_id
+        AND status = 'waitlisted'
+      ORDER BY created_at ASC
+      LIMIT 1
+      FOR UPDATE SKIP LOCKED
+    )
+    RETURNING id, first_name || ' ' || last_name
+      INTO v_promoted_id, v_promoted_name;
+  END IF;
+
+  RETURN jsonb_build_object(
+    'cancelled_id', p_registration_id,
+    'promoted_id', v_promoted_id,
+    'promoted_name', v_promoted_name
+  );
+END;
+$$;
+
+GRANT EXECUTE ON FUNCTION public.cancel_event_registration(uuid) TO authenticated;
+GRANT EXECUTE ON FUNCTION public.cancel_event_registration(uuid) TO service_role;