feat: add shared notification, communication, and export services for bookings, courses, and events; introduce btree_gist extension and new booking atomic function

apps/web/supabase/migrations/20260417000003500_booking_atomic_function.sql

@@ -0,0 +1,54 @@
+CREATE OR REPLACE FUNCTION public.create_booking_atomic(
+  p_account_id uuid,
+  p_room_id uuid,
+  p_guest_id uuid DEFAULT NULL,
+  p_check_in date DEFAULT NULL,
+  p_check_out date DEFAULT NULL,
+  p_adults integer DEFAULT 1,
+  p_children integer DEFAULT 0,
+  p_status text DEFAULT 'confirmed',
+  p_total_price numeric DEFAULT NULL,
+  p_notes text DEFAULT NULL
+)
+RETURNS uuid
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path = ''
+AS $fn$
+DECLARE
+  v_room record;
+  v_computed_price numeric(10,2);
+  v_booking_id uuid;
+BEGIN
+  SELECT * INTO v_room FROM public.rooms WHERE id = p_room_id FOR UPDATE;
+  IF v_room IS NULL THEN
+    RAISE EXCEPTION 'Room % not found', p_room_id USING ERRCODE = 'P0002';
+  END IF;
+  IF p_check_in IS NULL OR p_check_out IS NULL THEN
+    RAISE EXCEPTION 'check_in and check_out dates are required' USING ERRCODE = 'P0001';
+  END IF;
+  IF p_check_out <= p_check_in THEN
+    RAISE EXCEPTION 'check_out must be after check_in' USING ERRCODE = 'P0001';
+  END IF;
+  IF (p_adults + p_children) > v_room.capacity THEN
+    RAISE EXCEPTION 'Total guests exceed room capacity' USING ERRCODE = 'P0001';
+  END IF;
+
+  IF p_total_price IS NOT NULL THEN
+    v_computed_price := p_total_price;
+  ELSE
+    v_computed_price := v_room.price_per_night * (p_check_out - p_check_in);
+  END IF;
+
+  INSERT INTO public.bookings (
+    account_id, room_id, guest_id, check_in, check_out,
+    adults, children, status, total_price, notes
+  ) VALUES (
+    p_account_id, p_room_id, p_guest_id, p_check_in, p_check_out,
+    p_adults, p_children, p_status, v_computed_price, p_notes
+  )
+  RETURNING id INTO v_booking_id;
+
+  RETURN v_booking_id;
+END;
+$fn$;