feat: add signed PostgreSQL release updates

oa-backend/src/main/java/com/kaidi/oa/domain/Blog.java

@@ -5,7 +5,6 @@ import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
-import jakarta.persistence.Lob;
 import jakarta.persistence.Table;
 
 /** 博客文章（知识社区 - 我的博客）。tags 为逗号分隔。 */
@@ -22,7 +21,6 @@ public class Blog {
     @Column(length = 2000)
     private String summary;
 
-    @Lob
     @Column(columnDefinition = "TEXT")
     private String body;