stuff int -> long

backend/src/main/java/com/example/todoapp/dto/ToBuyResponse.java

@@ -5,7 +5,7 @@ import lombok.Data;
 @Data
 public class ToBuyResponse {
     private int tobuy_id;
-    private int stuff_id;
+    private Long stuff_id;
     private String stuff_name;
     private int amount;
     private String shop;

backend/src/main/java/com/example/todoapp/model/Stocks.java

@@ -39,7 +39,7 @@ public class Stocks {
      */
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private int stock_id ;
+    private Long stock_id ;
 
 
      /**

backend/src/main/java/com/example/todoapp/model/Stuffs.java

@@ -35,7 +35,7 @@ import lombok.NoArgsConstructor;
      */
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private int stuff_id ;
+    private Long stuff_id ;
 
     /**
     * カテゴリ名

backend/src/main/java/com/example/todoapp/model/ToBuys.java

@@ -48,7 +48,7 @@ public class ToBuys {
         referencedColumnName = "stuff_id", 
         nullable = false                
     )
-    private int stuff_id;   
+    private Long stuff_id;   
 
     /**
      * ユーザーテーブル参照用の外部キー

backend/src/main/java/com/example/todoapp/repository/StuffsRepository.java

@@ -24,6 +24,6 @@ import org.springframework.stereotype.Repository;
 @Repository
 public interface StuffsRepository extends JpaRepository<Stuffs, Long> {
     // 材料情報を主キーで取得するメソッド（必要に応じて追加）
-    Stuffs findByStuff_id(int stuff_id);
+    Stuffs findByStuff_id(Long stuff_id);
 
 }