添加允许撤回天数

sql/flow.sql

@@ -114,6 +114,7 @@ DROP TABLE IF EXISTS `flow_instance`;
 CREATE TABLE `flow_instance`  (
   `id` varchar(64) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT 'id',
   `status` int UNSIGNED NOT NULL DEFAULT 0 COMMENT '状态',
+  `cancel_days` int unsigned NOT NULL DEFAULT '0' COMMENT '撤回天数',
   PRIMARY KEY (`id`) USING BTREE
 ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = DYNAMIC;