Moved relationship between "Rewards" and "StampBoards" into "StampBoards" instead of "Rewards"

src/main/java/com/example/clientproject/data/rewards/Rewards.java

@@ -23,8 +23,4 @@ public class Rewards {
     private long rewardId;
     private String rewardName;
     private int rewardStampLocation;
-
-    @ManyToOne
-    @JoinColumn(name="Stamp_Board_Id", nullable=false)
-    private StampBoards stampBoard;
 }

src/main/java/com/example/clientproject/data/stampBoards/StampBoards.java

 package com.example.clientproject.data.stampBoards;
 
+import com.example.clientproject.data.rewards.Rewards;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
-import javax.persistence.Entity;
-import javax.persistence.GeneratedValue;
-import javax.persistence.Id;
+import javax.persistence.*;
+import java.util.Set;
 
 /**
  * StampBoards Entity
@@ -21,4 +21,8 @@ public class StampBoards {
     @GeneratedValue
     private long stampBoardId;
     private int stampBoardSize;
+
+    @OneToMany
+    @JoinColumn(name="Stamp_Board_Id")
+    private Set<Rewards> rewards;
 }