-- Tables affected: qt_configurations
-- recovery.not-started: check first; ADD COLUMN fails if custom_price already exists
-- recovery.partial: ALTER TABLE qt_configurations DROP COLUMN custom_price;
-- recovery.completed: no action needed
-- verify: custom_price column missing | SELECT 1 FROM information_schema.COLUMNS WHERE table_schema=DATABASE() AND table_name='qt_configurations' AND column_name='custom_price' HAVING COUNT(*)=0

-- Add custom_price column to qt_configurations table
ALTER TABLE qt_configurations ADD COLUMN custom_price DECIMAL(12,2) NULL COMMENT 'User-defined custom total price';