-- Add 'owner' and 'purchasing' roles to users table
ALTER TABLE users DROP CONSTRAINT IF EXISTS users_role_check;
UPDATE users SET role = 'admin' WHERE role NOT IN ('admin', 'manager', 'cashier', 'waiter', 'owner', 'purchasing');
ALTER TABLE users ADD CONSTRAINT users_role_check CHECK (role IN ('admin', 'manager', 'cashier', 'waiter', 'owner', 'purchasing'));