style: #151 회원 등급 정책 로직 수정 중

src/main/java/com/t3t/bookstoreapi/member/repository/MemberGradeRepository.java

@@ -1,19 +1,10 @@
 package com.t3t.bookstoreapi.member.repository;
 
 import com.t3t.bookstoreapi.member.model.entity.MemberGrade;
-import com.t3t.bookstoreapi.member.model.entity.MemberGradePolicy;
 import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.data.jpa.repository.Query;
 
-import java.util.List;
 import java.util.Optional;
 
 public interface MemberGradeRepository extends JpaRepository<MemberGrade, Integer> {
     Optional<MemberGrade> findByName(String name);
-
-    @Query("SELECT m.policy FROM MemberGrade m JOIN FETCH MemberGradePolicy mg WHERE m.policy.policyId = mg.policyId")
-    List<MemberGrade> findAll();
-
-    @Query("SELECT m.policy FROM MemberGrade m JOIN FETCH MemberGradePolicy mg WHERE m.policy.policyId = mg.policyId")
-    Optional<MemberGrade> findByPolicyId(Long policyId);
-}
+}