[EDIT] 収支Entityの主キーの型を修正しました。

src/main/java/com/example/demo/app/infra/entity/TransactionEntity.java

@@ -26,7 +26,7 @@ public class TransactionEntity {
 	@Id
 	@GeneratedValue(strategy = GenerationType.IDENTITY)
 	@Column(name = "transaction_id")
-	private Integer transactionId;
+	private Long transactionId;
 	
 	@Column(name = "amount", nullable = false)
 	private Integer amount;