feat: add signed PostgreSQL release updates

oa-backend/src/main/java/com/kaidi/oa/domain/Survey.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;
 
 /**
@@ -29,12 +28,10 @@ public class Survey {
 
     private String status;
 
-    @Lob
     @Column(name = "options_json", columnDefinition = "TEXT")
     private String optionsJson;
 
     // --> JSON array of voter usernames who already voted; used to reject duplicate votes.
-    @Lob
     @Column(name = "voters_json", columnDefinition = "TEXT")
     private String votersJson;