feat: 하이라이트 벌크 삽입 추가

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 +1,28 @@
+package reviewme.highlight.repository;
+
+import java.util.Collection;
+import lombok.RequiredArgsConstructor;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Repository;
+import reviewme.highlight.domain.Highlight;
+
+@Repository
+@RequiredArgsConstructor
+public class HighlightJdbcRepositoryImpl implements HighlightJdbcRepository {
+
+    private final JdbcTemplate jdbcTemplate;
+
+    @Override
+    public void saveAll(Collection<Highlight> highlights) {
+        jdbcTemplate.batchUpdate(
+                "INSERT INTO highlight (answer_id, line_index, start_index, end_index) VALUES (?, ?, ?, ?)",
+                highlights,
+                highlights.size(),
+                (ps, highlight) -> {
+                    ps.setLong(1, highlight.getAnswerId());
+                    ps.setInt(2, highlight.getLineIndex());
+                    ps.setInt(3, highlight.getHighlightRange().getStartIndex());
+                    ps.setInt(4, highlight.getHighlightRange().getEndIndex());
+                });
+    }
+}

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 +16,22 @@ 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, 2, new HighlightRange(2, 3))
+        );
+
+        // when
+        highlightRepository.saveAll(highlights);
+
+        // then
+        List<Highlight> actual = highlightRepository.findAllByAnswerIdsOrderedAsc(List.of(1L));
+        assertThat(actual).containsExactlyElementsOf(highlights);
+    }
+
     @Test
     void 하이라이트를_줄번호_시작_인덱스_순서대로_정렬해서_가져온다() {
         // given