逻辑优化， 添加配置（未完成）， db记录逻辑接入

src/services/excel_service.rs

@@ -57,6 +57,10 @@ impl ExcelService {
         Ok(())
     }
 
+    pub fn roll_back(&mut self){
+        self.current_line -= 1;
+    }
+
     pub fn get_next_work_model(&mut self) -> Result<WorkModel, String> {
         let mut work_model = WorkModel::default();
         if let Some(imei) = self.sheet.get((self.current_line, 0)) {