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/20260417000003_booking_atomic_create.sql

@@ -1,25 +1,4 @@
--- =====================================================
--- Atomic Booking Creation with Overlap Prevention
---
--- Problem: Creating a booking requires checking room
--- availability, validating capacity, and inserting — all
--- as separate queries. Race conditions can double-book
--- a room for overlapping dates.
---
--- Fix:
---  A) Enable btree_gist extension for exclusion constraints.
---  B) Add GiST exclusion constraint to prevent overlapping
---     bookings for the same room (non-cancelled/no_show).
---  C) Single transactional PG function that locks the room,
---     validates inputs, calculates price, and inserts. The
---     exclusion constraint provides a final safety net.
--- =====================================================
-
--- A) Enable btree_gist extension (required for exclusion constraints on non-GiST types)
-CREATE EXTENSION IF NOT EXISTS btree_gist;
-
--- B) Add exclusion constraint to prevent overlapping bookings (idempotent)
-DO $$
+DO $excl$
 BEGIN
   IF NOT EXISTS (
     SELECT 1 FROM pg_constraint WHERE conname = 'excl_booking_room_dates'
@@ -32,97 +11,4 @@ BEGIN
       ) WHERE (status NOT IN ('cancelled', 'no_show'));
   END IF;
 END;
-$$;
-
--- C) Atomic booking creation function
-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 $$
-DECLARE
-  v_room record;
-  v_computed_price numeric(10,2);
-  v_booking_id uuid;
-BEGIN
-  -- 1. Lock the room row to serialize booking attempts
-  SELECT * INTO v_room
-  FROM public.rooms
-  WHERE id = p_room_id
-  FOR UPDATE;
-
-  -- 2. Validate room exists
-  IF v_room IS NULL THEN
-    RAISE EXCEPTION 'Room % not found', p_room_id
-      USING ERRCODE = 'P0002';
-  END IF;
-
-  -- 3. Validate check_out > check_in
-  IF p_check_in IS NULL OR p_check_out IS NULL THEN
-    RAISE EXCEPTION 'check_in and check_out dates are required'
-      USING ERRCODE = 'P0001';
-  END IF;
-
-  IF p_check_out <= p_check_in THEN
-    RAISE EXCEPTION 'check_out (%) must be after check_in (%)', p_check_out, p_check_in
-      USING ERRCODE = 'P0001';
-  END IF;
-
-  -- 4. Validate total guests do not exceed room capacity
-  IF (p_adults + p_children) > v_room.capacity THEN
-    RAISE EXCEPTION 'Total guests (%) exceed room capacity (%)', (p_adults + p_children), v_room.capacity
-      USING ERRCODE = 'P0001';
-  END IF;
-
-  -- 5. Calculate price if not provided
-  IF p_total_price IS NOT NULL THEN
-    v_computed_price := p_total_price;
-  ELSE
-    v_computed_price := v_room.price_per_night * (p_check_out - p_check_in);
-  END IF;
-
-  -- 6. Insert the booking (exclusion constraint prevents double-booking)
-  INSERT INTO public.bookings (
-    account_id,
-    room_id,
-    guest_id,
-    check_in,
-    check_out,
-    adults,
-    children,
-    status,
-    total_price,
-    notes
-  ) VALUES (
-    p_account_id,
-    p_room_id,
-    p_guest_id,
-    p_check_in,
-    p_check_out,
-    p_adults,
-    p_children,
-    p_status,
-    v_computed_price,
-    p_notes
-  )
-  RETURNING id INTO v_booking_id;
-
-  -- 7. Return the new booking id
-  RETURN v_booking_id;
-END;
-$$;
-
-GRANT EXECUTE ON FUNCTION public.create_booking_atomic(uuid, uuid, uuid, date, date, integer, integer, text, numeric, text) TO authenticated;
-GRANT EXECUTE ON FUNCTION public.create_booking_atomic(uuid, uuid, uuid, date, date, integer, integer, text, numeric, text) TO service_role;
+$excl$;