fix: 防止内容超长

src/main/java/com/xydl/cac/iec/IEDCollectService.java

@@ -99,6 +99,9 @@ public class IEDCollectService {
     }
 
     private void saveWarning(String err) {
+        if (err.length() > 254) {
+            err = err.substring(0, 254);
+        }
         Warning warning = Warning.builder()
                 .zsbName("61850采集数据")
                 .dTime(new Date())