feat: add signed PostgreSQL release updates

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

@@ -6,7 +6,7 @@ import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
-import jakarta.persistence.Lob;
+import jakarta.persistence.Column;
 import jakarta.persistence.Table;
 
 /**
@@ -33,7 +33,7 @@ public class IpKnowledge {
     /** 技术关键词（逗号分隔，供按关键词检索）。 */
     private String keywords;
 
-    @Lob
+    @Column(columnDefinition = "TEXT")
     private String content;
 
     private String source;