撤回删除逻辑调整

core/src/main/java/com/wecloud/im/service/ImMessageService.java

@@ -127,15 +127,6 @@ public interface ImMessageService extends BaseService<ImMessage> {
     OfflineMsgDto getReceivedLastMsgByConversationId(Long clientId, Long conversationId);
 
     /**
-     * 保存
-     *
-     * @param imMessage
-     * @return
-     * @throws Exception
-     */
-    boolean saveImMessage(ImMessage imMessage) throws Exception;
-
-    /**
      * 获取读取人员
      * @param param
      * @return