update

src/main/java/com/yaoyuan/jiscuss/entity/Discussion.java

@@ -1,13 +1,15 @@
 package com.yaoyuan.jiscuss.entity;
 
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
 import lombok.Data;
 
-import javax.persistence.Column;
-import javax.persistence.Entity;
-import javax.persistence.GeneratedValue;
-import javax.persistence.GenerationType;
-import javax.persistence.Id;
-import javax.persistence.Table;
 import java.io.Serializable;
 import java.util.Date;
 
@@ -22,6 +24,8 @@ public class Discussion implements Serializable {
     @Column(name = "id", unique = true)
     private Integer id;
 
+    @NotBlank
+    @Size(max = 200)
     @Column(name = "title")
     private String title;
 
@@ -64,7 +68,7 @@ public class Discussion implements Serializable {
     @Column(name = "like_count")
     private Integer likeCount;
 
-
+    /** IP is resolved server-side via IpUtils.getClientIp() — never trusted from X-Forwarded-For alone. */
     @Column(name = "ip_address")
     private String ipAddress;
 
@@ -73,5 +77,5 @@ public class Discussion implements Serializable {
 
     @Column(name = "create_time")
     private Date createTime;
-
 }
+