优化

backend-single/src/main/java/com/emotion/mapper/MessageMapper.java

@@ -68,4 +68,16 @@ public interface MessageMapper extends BaseMapper<Message> {
     List<Message> searchByUserIdAndKeyword(@Param("userId") String userId,
                                           @Param("keyword") String keyword,
                                           @Param("limit") Integer limit);
+
+    /**
+     * 根据用户ID获取最近的消息
+     */
+    @Select("SELECT m.* FROM message m " +
+                    "INNER JOIN conversation c ON m.conversation_id = c.id " +
+                    "WHERE c.user_id = #{userId} " +
+                    "AND m.is_deleted = 0 " +
+                    "ORDER BY m.create_time DESC " +
+                    "LIMIT #{limit}")
+    List<Message> getRecentByUserId(@Param("userId") String userId,
+                    @Param("limit") Integer limit);
 }