[xingyu.guo] feat: 1.增加逻辑删除符 2. 移除字段“学习材料的存储URL”

src/main/java/com/guo/learningprogresstracker/entity/BaseEntity.java

@@ -2,6 +2,7 @@ package com.guo.learningprogresstracker.entity;
 
 import com.baomidou.mybatisplus.annotation.FieldFill;
 import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableLogic;
 import lombok.Data;
 
 import java.time.LocalDateTime;
@@ -26,4 +27,7 @@ public class BaseEntity {
 
     @TableField(fill = FieldFill.INSERT_UPDATE)
     private String deviceInfo;
+
+    @TableLogic
+    private Integer deleted;
 }