feat: add signed PostgreSQL release updates

oa-backend/src/main/java/com/kaidi/oa/domain/StdApplication.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;
 
 /**
@@ -38,7 +38,7 @@ public class StdApplication {
 
     private String planNo;
 
-    @Lob
+    @Column(columnDefinition = "TEXT")
     private String techContent;
 
     private String drafters;