feat: add signed PostgreSQL release updates

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

@@ -4,7 +4,7 @@ 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;
 
 import java.time.Instant;
@@ -34,7 +34,7 @@ public class ItKnowledgeArticle {
     private String keywords;
 
     /** 解决方案正文（步骤）。 */
-    @Lob
+    @Column(columnDefinition = "TEXT")
     private String content;
 
     /** 作者 / 维护人。 */