Changes

Co-authored-by: renee-png <262607627+renee-png@users.noreply.github.com>

supabase/migrations/20260425185053_96ee636e-66fc-4cd1-98ec-a96801a73c96.sql

@@ -0,0 +1,11 @@
+-- Add quantity and unit_price columns to expenses for itemized billing.
+-- amount remains the stored total = quantity * unit_price for backwards
+-- compatibility with reports, invoices, and trust accounting.
+ALTER TABLE public.expenses
+  ADD COLUMN IF NOT EXISTS quantity numeric NOT NULL DEFAULT 1,
+  ADD COLUMN IF NOT EXISTS unit_price numeric NOT NULL DEFAULT 0;
+
+-- Backfill: for existing rows, set unit_price = amount and quantity = 1.
+UPDATE public.expenses
+   SET unit_price = amount, quantity = 1
+ WHERE unit_price = 0 AND amount IS NOT NULL;