fix 打回重审

zhongzheng-system/src/main/java/com/zhongzheng/modules/grade/bo/RollBackPeriodBo.java

@@ -18,5 +18,5 @@ public class RollBackPeriodBo {
 
     @ApiModelProperty("签名")
     @NotBlank(message = "签名不能为空")
-    private Long sign;
+    private String sign;
 }