diff --git a/src/main/java/com/zhangmeng/deepseek/local/chat/entity/po/Course.java b/src/main/java/com/zhangmeng/deepseek/local/chat/entity/po/Course.java
deleted file mode 100644
index aa3b895..0000000
--- a/src/main/java/com/zhangmeng/deepseek/local/chat/entity/po/Course.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package com.zhangmeng.deepseek.local.chat.entity.po;
-
-import com.baomidou.mybatisplus.annotation.IdType;
-import com.baomidou.mybatisplus.annotation.TableId;
-import com.baomidou.mybatisplus.annotation.TableName;
-import lombok.Data;
-import lombok.EqualsAndHashCode;
-import lombok.experimental.Accessors;
-
-import java.io.Serializable;
-
-/**
- * <p>
- * 学科表
- * </p>
- *
- * @author huge
- * @since 2025-03-08
- */
-@Data
-@EqualsAndHashCode(callSuper = false)
-@Accessors(chain = true)
-@TableName("course")
-public class Course implements Serializable {
-
-    private static final long serialVersionUID = 1L;
-
-    /**
-     * 主键
-     */
-    @TableId(value = "id", type = IdType.AUTO)
-    private Integer id;
-
-    /**
-     * 学科名称
-     */
-    private String name;
-
-    /**
-     * 学历背景要求：0-无，1-初中，2-高中、3-大专、4-本科以上
-     */
-    private Integer edu;
-
-    /**
-     * 课程类型：编程、设计、自媒体、其它
-     */
-    private String type;
-
-    /**
-     * 课程价格
-     */
-    private Long price;
-
-    /**
-     * 学习时长，单位: 天
-     */
-    private Integer duration;
-
-
-}
diff --git a/src/main/java/com/zhangmeng/deepseek/local/chat/entity/po/CourseReservation.java b/src/main/java/com/zhangmeng/deepseek/local/chat/entity/po/CourseReservation.java
deleted file mode 100644
index 3645b5b..0000000
--- a/src/main/java/com/zhangmeng/deepseek/local/chat/entity/po/CourseReservation.java
+++ /dev/null
@@ -1,57 +0,0 @@
-package com.zhangmeng.deepseek.local.chat.entity.po;
-
-import com.baomidou.mybatisplus.annotation.IdType;
-import com.baomidou.mybatisplus.annotation.TableId;
-import com.baomidou.mybatisplus.annotation.TableName;
-import lombok.Data;
-import lombok.EqualsAndHashCode;
-import lombok.experimental.Accessors;
-
-import java.io.Serializable;
-
-/**
- * <p>
- * 
- * </p>
- *
- * @author huge
- * @since 2025-03-08
- */
-@Data
-@EqualsAndHashCode(callSuper = false)
-@Accessors(chain = true)
-@TableName("course_reservation")
-public class CourseReservation implements Serializable {
-
-    private static final long serialVersionUID = 1L;
-
-    @TableId(value = "id", type = IdType.AUTO)
-    private Integer id;
-
-    /**
-     * 预约课程
-     */
-    private String course;
-
-    /**
-     * 学生姓名
-     */
-    private String studentName;
-
-    /**
-     * 联系方式
-     */
-    private String contactInfo;
-
-    /**
-     * 预约校区
-     */
-    private String school;
-
-    /**
-     * 备注
-     */
-    private String remark;
-
-
-}
diff --git a/src/main/java/com/zhangmeng/deepseek/local/chat/entity/po/School.java b/src/main/java/com/zhangmeng/deepseek/local/chat/entity/po/School.java
deleted file mode 100644
index fb70a69..0000000
--- a/src/main/java/com/zhangmeng/deepseek/local/chat/entity/po/School.java
+++ /dev/null
@@ -1,45 +0,0 @@
-package com.zhangmeng.deepseek.local.chat.entity.po;
-
-import com.baomidou.mybatisplus.annotation.IdType;
-import com.baomidou.mybatisplus.annotation.TableId;
-import com.baomidou.mybatisplus.annotation.TableName;
-import lombok.Data;
-import lombok.EqualsAndHashCode;
-import lombok.experimental.Accessors;
-
-import java.io.Serializable;
-
-/**
- * <p>
- * 校区表
- * </p>
- *
- * @author huge
- * @since 2025-03-08
- */
-@Data
-@EqualsAndHashCode(callSuper = false)
-@Accessors(chain = true)
-@TableName("school")
-public class School implements Serializable {
-
-    private static final long serialVersionUID = 1L;
-
-    /**
-     * 主键
-     */
-    @TableId(value = "id", type = IdType.AUTO)
-    private Integer id;
-
-    /**
-     * 校区名称
-     */
-    private String name;
-
-    /**
-     * 校区所在城市
-     */
-    private String city;
-
-
-}
diff --git a/src/main/java/com/zhangmeng/deepseek/local/chat/entity/query/CourseQuery.java b/src/main/java/com/zhangmeng/deepseek/local/chat/entity/query/CourseQuery.java
deleted file mode 100644
index 3e6420e..0000000
--- a/src/main/java/com/zhangmeng/deepseek/local/chat/entity/query/CourseQuery.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.zhangmeng.deepseek.local.chat.entity.query;
-
-import lombok.Data;
-import org.springframework.ai.tool.annotation.ToolParam;
-
-import java.util.List;
-
-@Data
-public class CourseQuery {
-    @ToolParam(required = false, description = "课程类型：编程、设计、自媒体、其它")
-    private String type;
-    @ToolParam(required = false, description = "学历要求：0-无、1-初中、2-高中、3-大专、4-本科及本科以上")
-    private Integer edu;
-    @ToolParam(required = false, description = "排序方式")
-    private List<Sort> sorts;
-
-    @Data
-    public static class Sort {
-        @ToolParam(required = false, description = "排序字段: price或duration")
-        private String field;
-        @ToolParam(required = false, description = "是否是升序: true/false")
-        private Boolean asc;
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/com/zhangmeng/deepseek/local/chat/repository/InMemoryChatHistoryRepository.java b/src/main/java/com/zhangmeng/deepseek/local/chat/repository/InMemoryChatHistoryRepository.java
index b04e310..f4e4328 100644
--- a/src/main/java/com/zhangmeng/deepseek/local/chat/repository/InMemoryChatHistoryRepository.java
+++ b/src/main/java/com/zhangmeng/deepseek/local/chat/repository/InMemoryChatHistoryRepository.java
@@ -35,12 +35,28 @@ public class InMemoryChatHistoryRepository implements ChatHistoryRepository {
 
     private final ChatMemory chatMemory;
 
+    /**
+     *
+     * @param type 业务类型，如：chat、service、pdf
+     * @param chatId 会话ID
+     */
     @Override
     public void save(String type, String chatId) {
         /*if (!chatHistory.containsKey(type)) {
             chatHistory.put(type, new ArrayList<>());
         }
         List<String> chatIds = chatHistory.get(type);*/
+
+        /**
+         * computeIfAbsent是Java 8引入的一个非常有用的Map方法，其签名如下：
+         * default V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction)
+         * CopyInsert
+         * 参数：
+         * key：要查找的键。
+         * mappingFunction：一个函数，如果指定的键不存在，则用于计算新值的函数。
+         * 返回值：如果键存在，则返回键对应的值；如果键不存在，则计算一个新的值并将其与键关联，然后返回这个新值。
+         */
+
         List<String> chatIds = chatHistory.computeIfAbsent(type, k -> new ArrayList<>());
         if (chatIds.contains(chatId)) {
             return;