updatable=false in createdAt and createdBy

Author: Rajeev Kumar Singh

polling-app-server/src/main/java/com/example/polls/model/audit/DateAudit.java

@@ -5,6 +5,7 @@
 import org.springframework.data.annotation.LastModifiedDate;
 import org.springframework.data.jpa.domain.support.AuditingEntityListener;
 
+import javax.persistence.Column;
 import javax.persistence.EntityListeners;
 import javax.persistence.MappedSuperclass;
 import java.io.Serializable;
@@ -19,9 +20,11 @@
 public abstract class DateAudit implements Serializable {
 
     @CreatedDate
+    @Column(nullable = false, updatable = false)
     private Instant createdAt;
 
     @LastModifiedDate
+    @Column(nullable = false)
     private Instant updatedAt;
 
     public Instant getCreatedAt() {

polling-app-server/src/main/java/com/example/polls/model/audit/UserDateAudit.java

@@ -4,6 +4,7 @@
 import org.springframework.data.annotation.CreatedBy;
 import org.springframework.data.annotation.LastModifiedBy;
 
+import javax.persistence.Column;
 import javax.persistence.MappedSuperclass;
 
 /**
@@ -18,6 +19,7 @@
 public abstract class UserDateAudit extends DateAudit {
 
     @CreatedBy
+    @Column(updatable = false)
     private Long createdBy;
 
     @LastModifiedBy