목록 추가 (POST) 및 수정 (PUT) 테스트 (참고한 페이지 : https://tanstack.com/query/v4/docs/react/examples/react/optimistic-updates-typescript) import styles from './styles.module.scss'; import React, { useState } from 'react'; import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'; import axios from 'axios'; export default function Study() { const queryClient = useQueryClient(); interface ..