feat: add signed PostgreSQL release updates

oa-backend/src/main/java/com/kaidi/oa/domain/FlowTrace.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;
 
 import java.time.Instant;
@@ -31,7 +30,6 @@ public class FlowTrace {
     /** Who handled the step. */
     private String who;
 
-    @Lob
     @Column(columnDefinition = "TEXT")
     private String opinion;