diff --git a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Answer.java b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Answer.java
index 53d0d35..969119a 100644
--- a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Answer.java
+++ b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Answer.java
@@ -4,6 +4,8 @@ package com.edufocus.edufocus.report.entity.vo;
 import com.edufocus.edufocus.quiz.entity.Quiz;
 import jakarta.persistence.*;
 import lombok.*;
+import org.hibernate.annotations.OnDelete;
+import org.hibernate.annotations.OnDeleteAction;
 
 @Entity
 @Getter
@@ -17,15 +19,21 @@ public class Answer {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private long id;
+
+    @Column
     private String userAnswer;
+
+    @Column
     private boolean isCorrect;
 
     @ManyToOne
     @JoinColumn(name = "report_id")
+    @OnDelete(action = OnDeleteAction.CASCADE)
     private Report report;
 
     @ManyToOne
     @JoinColumn(name = "quiz_id")
+    @OnDelete(action = OnDeleteAction.CASCADE)
     private Quiz quiz;
 
 }
diff --git a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Report.java b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Report.java
index 6e5d89a..9bb0440 100644
--- a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Report.java
+++ b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Report.java
@@ -46,13 +46,15 @@ public class Report {
 
     @ManyToOne
     @JoinColumn(name = "quizset_id")
+    @OnDelete(action = OnDeleteAction.CASCADE)
     private QuizSet quizSet;
 
     @ManyToOne
     @JoinColumn(name = "reportset_id")
+    @OnDelete(action = OnDeleteAction.CASCADE)
     private ReportSet reportSet;
 
-    @OneToMany(mappedBy = "report", cascade = CascadeType.REMOVE)
+    @OneToMany(mappedBy = "report")
     private List<Answer> answers;
 
     public ReportResponse makeReportResponse() {
diff --git a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java
index c23547c..f5beca6 100644
--- a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java
+++ b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java
@@ -39,7 +39,7 @@ public class ReportSet {
     @Temporal(TemporalType.TIMESTAMP)
     private Date createAt;
 
-    @OneToMany(mappedBy = "reportSet", cascade = CascadeType.REMOVE)
+    @OneToMany(mappedBy = "reportSet")
     private List<Report> reports;
 
     @ManyToOne
@@ -49,6 +49,7 @@ public class ReportSet {
 
     @ManyToOne
     @JoinColumn(name = "quizSet_id")
+    @OnDelete(action = OnDeleteAction.CASCADE)
     private QuizSet quizSet;
 
     public ReportSetResponse makeReportSetResponse() {