-- 桂物合同合规系统（HCS）接入：收票单合同补录字段（设计文档 §4，P4，D13）。
-- blade_invoice_receipt 追加合同补录字段：应付结算链路回溯不到时页面人工补录。
-- 通过 information_schema 判断字段是否存在，可重复执行。
SET @db_name = DATABASE();

SET @sql = IF(
  EXISTS (SELECT 1 FROM information_schema.columns WHERE table_schema = @db_name AND table_name = 'blade_invoice_receipt' AND column_name = 'hcs_contract_id'),
  'SELECT 1',
  'ALTER TABLE blade_invoice_receipt ADD COLUMN hcs_contract_id bigint DEFAULT NULL COMMENT ''合规推送合同ID（应付结算回溯不到时人工补录）'''
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @sql = IF(
  EXISTS (SELECT 1 FROM information_schema.columns WHERE table_schema = @db_name AND table_name = 'blade_invoice_receipt' AND column_name = 'hcs_contract_no'),
  'SELECT 1',
  'ALTER TABLE blade_invoice_receipt ADD COLUMN hcs_contract_no varchar(64) DEFAULT NULL COMMENT ''合规推送合同编号（应付结算回溯不到时人工补录）'''
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;