-- Step 1: Add account_number column to units (rename from buildium_account_number)
ALTER TABLE public.units RENAME COLUMN buildium_account_number TO account_number;

-- Step 2: Migrate any account_number data from owners to their linked units (if unit doesn't already have one)
UPDATE public.units u
SET account_number = o.account_number
FROM public.owners o
WHERE o.unit_id = u.id
  AND o.account_number IS NOT NULL
  AND (u.account_number IS NULL OR u.account_number = '');

-- Step 3: Drop account_number from owners
ALTER TABLE public.owners DROP COLUMN account_number;