diff --git a/shop/supabase/migrations/20260623000100_add_order_number_and_hash_to_orders.sql b/shop/supabase/migrations/20260623000100_add_order_number_and_hash_to_orders.sql
new file mode 100644
index 0000000..808da24
--- /dev/null
+++ b/shop/supabase/migrations/20260623000100_add_order_number_and_hash_to_orders.sql
@@ -0,0 +1,17 @@
+-- Migration: Add order_number and order_hash to orders table
+ALTER TABLE public.orders 
+  ADD COLUMN IF NOT EXISTS order_number TEXT,
+  ADD COLUMN IF NOT EXISTS order_hash TEXT;
+
+-- Update existing orders to have a unique order_number
+UPDATE public.orders 
+  SET order_number = 'RE-' || EXTRACT(YEAR FROM created_at)::text || '-' || floor(10000 + random() * 90000)::text
+  WHERE order_number IS NULL;
+
+-- Now add unique constraint and make it not null
+ALTER TABLE public.orders 
+  ALTER COLUMN order_number SET NOT NULL,
+  ADD CONSTRAINT orders_order_number_key UNIQUE (order_number);
+
+-- Notify PostgREST to reload schema cache
+NOTIFY pgrst, 'reload schema';