[BE] feat: 하이라이트 벌크 삽입 추가 (#961)

* feat: 하이라이트 벌크 삽입 추가

* refactor: 불필요한 `@Repository` 제거

* fix: `findAll` 사용하지 않도록 수정

* fix: 테스트 수정

* refactor: `NamedParameterJdbcTemplate` 사용하도록 수정

backend/src/main/java/reviewme/highlight/repository/HighlightJdbcRepository.java

@@ -0,0 +1,9 @@
+package reviewme.highlight.repository;
+
+import java.util.Collection;
+import reviewme.highlight.domain.Highlight;
+
+public interface HighlightJdbcRepository {
+
+    void saveAll(Collection<Highlight> highlights);
+}

backend/src/main/java/reviewme/highlight/repository/HighlightJdbcRepositoryImpl.java

@@ -0,0 +1,24 @@
+package reviewme.highlight.repository;
+
+import java.util.Collection;
+import lombok.RequiredArgsConstructor;
+import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
+import org.springframework.jdbc.core.namedparam.SqlParameterSource;
+import org.springframework.jdbc.core.namedparam.SqlParameterSourceUtils;
+import reviewme.highlight.domain.Highlight;
+
+@RequiredArgsConstructor
+public class HighlightJdbcRepositoryImpl implements HighlightJdbcRepository {
+
+    private final NamedParameterJdbcTemplate namedParameterJdbcTemplate;
+
+    @Override
+    public void saveAll(Collection<Highlight> highlights) {
+        SqlParameterSource[] parameterSources = SqlParameterSourceUtils.createBatch(highlights.toArray());
+        String insertSql = """
+                INSERT INTO highlight (answer_id, line_index, start_index, end_index)
+                VALUES (:answerId, :lineIndex, :highlightRange.startIndex, :highlightRange.endIndex)
+                """;
+        namedParameterJdbcTemplate.batchUpdate(insertSql, parameterSources);
+    }
+}

backend/src/main/java/reviewme/highlight/repository/HighlightRepository.java

@@ -2,12 +2,16 @@
 
 import java.util.Collection;
 import java.util.List;
-import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.Repository;
 import reviewme.highlight.domain.Highlight;
 
-public interface HighlightRepository extends JpaRepository<Highlight, Long> {
+public interface HighlightRepository extends Repository<Highlight, Long>, HighlightJdbcRepository {
+
+    Highlight save(Highlight highlight);
+
+    boolean existsById(long id);
 
     @Modifying
     @Query("""

backend/src/test/java/reviewme/highlight/repository/HighlightRepositoryTest.java

@@ -16,6 +16,24 @@ class HighlightRepositoryTest {
     @Autowired
     private HighlightRepository highlightRepository;
 
+    @Test
+    void 한_번에_여러_하이라이트를_벌크_삽입한다() {
+        // given
+        List<Highlight> highlights = List.of(
+                new Highlight(1L, 1, new HighlightRange(1, 2)),
+                new Highlight(1L, 1, new HighlightRange(3, 5))
+        );
+
+        // when
+        highlightRepository.saveAll(highlights);
+
+        // then
+        List<Highlight> actual = highlightRepository.findAllByAnswerIdsOrderedAsc(List.of(1L));
+        assertThat(actual)
+                .extracting(Highlight::getHighlightRange)
+                .containsExactly(new HighlightRange(1, 2), new HighlightRange(3, 5));
+    }
+
     @Test
     void 하이라이트를_줄번호_시작_인덱스_순서대로_정렬해서_가져온다() {
         // given

backend/src/test/java/reviewme/highlight/service/HighlightServiceTest.java

@@ -102,7 +102,7 @@ class HighlightServiceTest {
         highlightService.editHighlight(highlightsRequest, reviewGroup);
 
         // then
-        List<Highlight> highlights = highlightRepository.findAll();
+        List<Highlight> highlights = highlightRepository.findAllByAnswerIdsOrderedAsc(List.of(textAnswer.getId()));
         assertAll(
                 () -> assertThat(highlights.get(0).getAnswerId()).isEqualTo(textAnswer.getId()),
                 () -> assertThat(highlights.get(0).getHighlightRange()).isEqualTo(