docs(osiv): lazy loading 검증 기록을 남긴다

docs/20260618_유저크리에이터채팅_WebSocket전환/plan-task.md

@@ -339,6 +339,33 @@ spring:
     - 어떻게: `src/main/resources/application.yml`, `src/test/resources/application.yml`의 `spring.jpa` 아래에 `open-in-view: false`를 추가했다.
     - 결과: 확인된 lazy loading 재현 실패가 없어 production code의 service/repository/controller 수정은 하지 않았다. 공개 API 스키마 변경도 없다.
 
+- [x] **Task 0.5: 운영 LazyInitializationException 회귀 보완**
+  - Files:
+    - Add: `src/test/kotlin/kr/co/vividnext/sodalive/osiv/OsivLazyLoadingRegressionTest.kt`
+    - Modify: `src/main/kotlin/kr/co/vividnext/sodalive/chat/character/repository/ChatCharacterRepository.kt`
+    - Modify: `src/main/kotlin/kr/co/vividnext/sodalive/rank/RankingRepository.kt`
+    - Modify: `docs/20260618_유저크리에이터채팅_WebSocket전환/prd.md`
+    - Modify: `docs/20260618_유저크리에이터채팅_WebSocket전환/plan-task.md`
+  - RED: `ChatCharacterService.getCharacterDetail` 반환 후 `tagMappings.tag.tag`, `getOtherCharactersBySharedTags` 반환 후 `tagMappings.tag.tag`, `RankingRepository.getCreatorRankings` 반환 후 `Member.toExplorerSectionCreator`를 트랜잭션 밖에서 접근하는 테스트를 추가한다.
+  - 실패 확인:
+    - Run: `./gradlew --no-daemon test -Dkotlin.compiler.execution.strategy=in-process -Dspring.jpa.open-in-view=false --tests kr.co.vividnext.sodalive.osiv.OsivLazyLoadingRegressionTest`
+    - Expected: 기존 코드에서는 `LazyInitializationException` 또는 동등한 실패가 발생한다.
+  - GREEN: 응답 조립에 필요한 `ChatCharacter.tagMappings.tag`, `Member.tags.tag`를 조회 쿼리에서 fetch join으로 선로딩한다.
+  - 통과 확인:
+    - Run: `./gradlew --no-daemon test -Dkotlin.compiler.execution.strategy=in-process -Dspring.jpa.open-in-view=false --tests kr.co.vividnext.sodalive.osiv.OsivLazyLoadingRegressionTest`
+    - Expected: `BUILD SUCCESSFUL`
+  - REFACTOR: 공개 API 응답 스키마와 WebSocket 관련 구현은 변경하지 않는다.
+  - 검증 기록:
+    - 무엇: OSIV off 상태에서 운영 오류와 같은 lazy loading 경계를 재현하는 회귀 테스트를 추가하고, 필요한 연관을 fetch join으로 선로딩했다.
+    - 왜: `ChatCharacterController.getCharacterDetail`에서 `ChatCharacterTagMapping.tag`, `HomeService.fetchData`에서 `Member.tags`가 트랜잭션 밖에서 열려 `LazyInitializationException`이 발생했기 때문이다.
+    - 어떻게: `OsivLazyLoadingRegressionTest`를 추가해 `ChatCharacterService.getCharacterDetail`, `ChatCharacterService.getOtherCharactersBySharedTags`, `RankingRepository.getCreatorRankings` 반환 후 트랜잭션 밖 DTO 변환을 검증했다.
+    - RED: `./gradlew --no-daemon test -Dkotlin.compiler.execution.strategy=in-process -Dspring.jpa.open-in-view=false --tests kr.co.vividnext.sodalive.osiv.OsivLazyLoadingRegressionTest` 실행 결과 3개 테스트 모두 `LazyInitializationException`으로 실패했다.
+    - GREEN: 같은 명령을 재실행해 `BUILD SUCCESSFUL in 1m 6s`로 통과했다.
+    - 인접 회귀: `./gradlew --no-daemon cleanTest test -Dkotlin.compiler.execution.strategy=in-process -Dspring.jpa.open-in-view=false --tests kr.co.vividnext.sodalive.osiv.OsivLazyLoadingRegressionTest --tests kr.co.vividnext.sodalive.api.home.HomeServiceTest --tests kr.co.vividnext.sodalive.chat.character.controller.ChatCharacterControllerTest`가 `BUILD SUCCESSFUL in 24s`로 통과했다.
+    - 전체 테스트 중단: `./gradlew --no-daemon test -Dkotlin.compiler.execution.strategy=in-process -Dspring.jpa.open-in-view=false`는 `UserCreatorChatRedisIntegrationTest` 실행 중 `OutOfMemoryError`가 발생해 즉시 중단했다. 이후 검증 범위는 OSIV 회귀와 인접 테스트로 간결화했다.
+    - lint: `./gradlew --no-daemon ktlintCheck`가 `BUILD SUCCESSFUL in 14s`로 통과했다.
+    - 정적 점검: `rg -n "toExplorerSectionCreator\\(|tagMappings\\.map|tagMappings\\.joinToString|\\.tagMappings" src/main/kotlin/kr/co/vividnext/sodalive -S`로 동일 패턴 후보를 확인했다. `ExplorerService`는 클래스 단위 `@Transactional(readOnly = true)` 안에서 변환하고, `HomeService`/`RankingService`는 공통 `RankingRepository.getCreatorRankings` 선로딩으로 보완했다. `TranslationSourceExtractor`와 관리자/원작 DTO 변환의 `tagMappings` 접근은 운영 stacktrace 표면이 아니므로 별도 회귀 후보로 남겼다.
+
 ---
 
 ### Phase 1: WebSocket 의존성과 인증 handshake 기반 추가
@@ -916,3 +943,10 @@ spring:
   - OSIV off 테스트: Phase 0 묶음 검증 명령에 포함
   - 수정 방향: JPA lazy loading 직접 검증은 아니며, WebMvc 표면 회귀만 확인
   - 처리 상태: XML 기준 `CreatorChannelHomeControllerTest` 2개, `CreatorChannelLiveControllerTest` 5개 모두 `failures=0`, `errors=0`
+- API/기능: 캐릭터 상세/홈 크리에이터 랭킹 운영 회귀
+  - 파일: `src/main/kotlin/kr/co/vividnext/sodalive/chat/character/controller/ChatCharacterController.kt`, `src/main/kotlin/kr/co/vividnext/sodalive/chat/character/service/ChatCharacterService.kt`, `src/main/kotlin/kr/co/vividnext/sodalive/chat/character/repository/ChatCharacterRepository.kt`, `src/main/kotlin/kr/co/vividnext/sodalive/api/home/HomeService.kt`, `src/main/kotlin/kr/co/vividnext/sodalive/rank/RankingRepository.kt`
+  - 위험 유형: service/repository 반환 후 controller/service DTO 변환 중 nested lazy proxy 접근
+  - lazy 접근 대상: `ChatCharacter.tagMappings.tag`, `Member.tags.tag`
+  - OSIV off 테스트: `OsivLazyLoadingRegressionTest`
+  - 수정 방향: 상세/공유 태그 캐릭터 조회와 크리에이터 랭킹 조회에서 필요한 연관을 fetch join으로 선로딩
+  - 처리 상태: `OsivLazyLoadingRegressionTest` 3개 모두 통과

docs/20260618_유저크리에이터채팅_WebSocket전환/prd.md

@@ -235,6 +235,20 @@
 - 관리자/크리에이터/사용자 API가 서로 다른 controller 패키지에 흩어져 있으므로 특정 패키지 검색만으로 점검을 끝내지 않는다.
 - OSIV off 적용 후 일부 API가 실패하면 WebSocket 전환과 섞어 수정하지 않고, lazy loading 제거 task로 분리해 먼저 처리한다.
 
+### Feature H. OSIV off lazy loading 회귀 보완
+
+#### Requirements
+- 운영에서 확인된 `LazyInitializationException` 발생 지점을 우선 수정한다.
+- `ChatCharacterController.getCharacterDetail` 응답 조립에 필요한 `ChatCharacter.tagMappings.tag`는 OSIV off 상태에서도 접근 가능해야 한다.
+- `HomeService.fetchData`의 크리에이터 랭킹 응답 조립에 필요한 `Member.tags.tag`는 OSIV off 상태에서도 접근 가능해야 한다.
+- 동일 변환 메서드(`toExplorerSectionCreator`)를 쓰는 기존 랭킹 조회도 같은 쿼리 선로딩 정책을 공유해야 한다.
+- 공개 API 응답 스키마는 변경하지 않는다.
+
+#### Edge Cases
+- 컬렉션 크기만 접근하면 nested LAZY proxy(`mapping.tag`)는 초기화되지 않을 수 있다.
+- 조회 테스트에 `@Transactional`이 붙어 있으면 서비스 반환 후 lazy 접근 실패를 가릴 수 있다.
+- fetch join으로 one-to-many를 가져오면 중복 row가 생길 수 있으므로 결과 중복 여부를 검증한다.
+
 ---
 
 ## 8. UX / UI Expectations

src/main/kotlin/kr/co/vividnext/sodalive/admin/chat/original/service/AdminOriginalWorkService.kt

@@ -196,8 +196,12 @@ class AdminOriginalWorkService(
     /** 원작 상세 조회 (소프트 삭제 제외) */
     @Transactional(readOnly = true)
     fun getOriginalWork(id: Long): OriginalWork {
-        return originalWorkRepository.findByIdAndIsDeletedFalse(id)
+        val originalWork = originalWorkRepository.findByIdAndIsDeletedFalse(id)
             .orElseThrow { SodaException(messageKey = "admin.chat.original.not_found") }
+
+        initializeResponseRelations(originalWork)
+
+        return originalWork
     }
 
     /** 원작 페이징 조회 */
@@ -210,7 +214,9 @@ class AdminOriginalWorkService(
             else -> size
         }
         val pageable = PageRequest.of(safePage, safeSize, Sort.by("createdAt").descending())
-        return originalWorkRepository.findByIsDeletedFalse(pageable)
+        val originalWorks = originalWorkRepository.findByIsDeletedFalse(pageable)
+        originalWorks.content.forEach { initializeResponseRelations(it) }
+        return originalWorks
     }
 
     /** 지정 원작에 속한 활성 캐릭터 페이징 조회 (최신순) */
@@ -233,7 +239,14 @@ class AdminOriginalWorkService(
     /** 원작 검색 (제목/콘텐츠타입/카테고리, 소프트 삭제 제외) - 무페이징 */
     @Transactional(readOnly = true)
     fun searchOriginalWorksAll(searchTerm: String): List<OriginalWork> {
-        return originalWorkRepository.searchNoPaging(searchTerm)
+        val originalWorks = originalWorkRepository.searchNoPaging(searchTerm)
+        originalWorks.forEach { initializeResponseRelations(it) }
+        return originalWorks
+    }
+
+    private fun initializeResponseRelations(originalWork: OriginalWork) {
+        originalWork.originalLinks.forEach { it.url }
+        originalWork.tagMappings.forEach { it.tag.tag }
     }
 
     /** 원작에 기존 캐릭터들을 배정 */

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/repository/ChatCharacterRepository.kt

@@ -74,6 +74,28 @@ interface ChatCharacterRepository : JpaRepository<ChatCharacter, Long> {
         pageable: Pageable
     ): List<ChatCharacter>
 
+    /**
+     * 특정 캐릭터와 태그를 공유하는 다른 캐릭터 ID를 무작위로 조회 (현재 캐릭터 제외)
+     */
+    @Query(
+        """
+        SELECT c.id FROM ChatCharacter c
+        JOIN c.tagMappings tm
+        JOIN tm.tag t
+        WHERE c.isActive = true
+          AND c.id <> :characterId
+          AND t.id IN (
+            SELECT t2.id FROM ChatCharacterTagMapping tm2 JOIN tm2.tag t2 WHERE tm2.chatCharacter.id = :characterId
+          )
+        GROUP BY c.id
+        ORDER BY function('RAND')
+        """
+    )
+    fun findRandomIdsBySharedTags(
+        @Param("characterId") characterId: Long,
+        pageable: Pageable
+    ): List<Long>
+
     /**
      * 활성 캐릭터 무작위 조회
      */
@@ -99,6 +121,27 @@ interface ChatCharacterRepository : JpaRepository<ChatCharacter, Long> {
     fun findRandomActiveExcluding(@Param("excludeIds") excludeIds: List<Long>, pageable: Pageable): List<ChatCharacter>
 
     fun findByIdInAndIsActiveTrue(ids: List<Long>): List<ChatCharacter>
+
+    @Query(
+        """
+        SELECT DISTINCT c FROM ChatCharacter c
+        LEFT JOIN FETCH c.tagMappings tm
+        LEFT JOIN FETCH tm.tag
+        WHERE c.id = :id
+        """
+    )
+    fun findByIdWithTagMappings(@Param("id") id: Long): ChatCharacter?
+
+    @Query(
+        """
+        SELECT DISTINCT c FROM ChatCharacter c
+        LEFT JOIN FETCH c.tagMappings tm
+        LEFT JOIN FETCH tm.tag
+        WHERE c.id IN :ids
+        """
+    )
+    fun findByIdInWithTagMappings(@Param("ids") ids: List<Long>): List<ChatCharacter>
+
     fun findByCreatorMemberId(creatorMemberId: Long): ChatCharacter?
     fun existsByCreatorMemberId(creatorMemberId: Long): Boolean
 }

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/service/ChatCharacterService.kt

@@ -210,13 +210,15 @@ class ChatCharacterService(
      */
     @Transactional(readOnly = true)
     fun getOtherCharactersBySharedTags(characterId: Long, limit: Int = 10): List<ChatCharacter> {
-        val others = chatCharacterRepository.findRandomBySharedTags(
+        val ids = chatCharacterRepository.findRandomIdsBySharedTags(
             characterId,
             PageRequest.of(0, limit)
-        )
-        // 태그 초기화 (지연 로딩 문제 방지)
-        others.forEach { it.tagMappings.size }
-        return others
+        ).distinct()
+        if (ids.isEmpty()) return emptyList()
+
+        val charactersById = chatCharacterRepository.findByIdInWithTagMappings(ids)
+            .associateBy { it.id }
+        return ids.mapNotNull { charactersById[it] }
     }
 
     /**
@@ -555,13 +557,12 @@ class ChatCharacterService(
      */
     @Transactional(readOnly = true)
     fun getCharacterDetail(id: Long): ChatCharacter? {
-        val character = findById(id) ?: return null
+        val character = chatCharacterRepository.findByIdWithTagMappings(id) ?: return null
 
         // 지연 로딩된 관계 데이터 초기화
-        character.tagMappings.size
-        character.valueMappings.size
-        character.hobbyMappings.size
-        character.goalMappings.size
+        character.valueMappings.forEach { it.value.value }
+        character.hobbyMappings.forEach { it.hobby.hobby }
+        character.goalMappings.forEach { it.goal.goal }
         character.memories.size
         character.personalities.size
         character.backgrounds.size

src/main/kotlin/kr/co/vividnext/sodalive/chat/original/service/OriginalWorkQueryService.kt

@@ -43,8 +43,13 @@ class OriginalWorkQueryService(
      */
     @Transactional(readOnly = true)
     fun getOriginalWork(id: Long): OriginalWork {
-        return originalWorkRepository.findByIdAndIsDeletedFalse(id)
+        val originalWork = originalWorkRepository.findByIdAndIsDeletedFalse(id)
             .orElseThrow { SodaException(messageKey = "chat.original.not_found") }
+
+        originalWork.originalLinks.forEach { it.url }
+        originalWork.tagMappings.forEach { it.tag.tag }
+
+        return originalWork
     }
 
     /**

src/main/kotlin/kr/co/vividnext/sodalive/i18n/translation/ResourceTranslationJobScheduler.kt

@@ -2,12 +2,14 @@ package kr.co.vividnext.sodalive.i18n.translation
 
 import kr.co.vividnext.sodalive.i18n.translation.PapagoTranslationService.Companion.getTranslatableLanguageCodes
 import org.springframework.stereotype.Service
+import org.springframework.transaction.annotation.Transactional
 
 @Service
 class ResourceTranslationJobScheduler(
     private val sourceExtractor: TranslationSourceExtractor,
     private val translationJobScheduler: TranslationJobScheduler
 ) {
+    @Transactional
     fun scheduleResourceTranslations(resourceType: LanguageTranslationTargetType, resourceId: Long) {
         val source = sourceExtractor.extract(resourceType, resourceId) ?: return
         getTranslatableLanguageCodes(source.sourceLanguage).forEach { targetLanguage ->
@@ -15,6 +17,7 @@ class ResourceTranslationJobScheduler(
         }
     }
 
+    @Transactional
     fun scheduleResourceTranslation(
         resourceType: LanguageTranslationTargetType,
         resourceId: Long,

src/main/kotlin/kr/co/vividnext/sodalive/rank/RankingRepository.kt

@@ -23,6 +23,8 @@ import kr.co.vividnext.sodalive.member.Member
 import kr.co.vividnext.sodalive.member.MemberRole
 import kr.co.vividnext.sodalive.member.QMember.member
 import kr.co.vividnext.sodalive.member.block.QBlockMember.blockMember
+import kr.co.vividnext.sodalive.member.tag.QCreatorTag.creatorTag
+import kr.co.vividnext.sodalive.member.tag.QMemberCreatorTag.memberCreatorTag
 import org.springframework.beans.factory.annotation.Value
 import org.springframework.stereotype.Repository
 import java.time.LocalDateTime
@@ -53,6 +55,8 @@ class RankingRepository(
             .select(member)
             .from(creatorRanking)
             .innerJoin(creatorRanking.member, member)
+            .leftJoin(member.tags, memberCreatorTag).fetchJoin()
+            .leftJoin(memberCreatorTag.tag, creatorTag).fetchJoin()
 
         if (memberId != null) {
             select = select.leftJoin(blockMember).on(blockMemberCondition)
@@ -65,6 +69,7 @@ class RankingRepository(
         return select
             .orderBy(creatorRanking.ranking.asc())
             .fetch()
+            .distinctBy { it.id }
     }
 
     fun getAudioContentRanking(

src/test/kotlin/kr/co/vividnext/sodalive/osiv/OsivLazyLoadingRegressionTest.kt

@@ -0,0 +1,448 @@
+package kr.co.vividnext.sodalive.osiv
+
+import com.querydsl.jpa.impl.JPAQueryFactory
+import kr.co.vividnext.sodalive.admin.chat.original.dto.OriginalWorkResponse
+import kr.co.vividnext.sodalive.admin.chat.original.service.AdminOriginalWorkService
+import kr.co.vividnext.sodalive.chat.character.ChatCharacter
+import kr.co.vividnext.sodalive.chat.character.image.CharacterImageRepository
+import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterGoalRepository
+import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterHobbyRepository
+import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterRepository
+import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterTagRepository
+import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterValueRepository
+import kr.co.vividnext.sodalive.chat.character.service.ChatCharacterCreatorMemberService
+import kr.co.vividnext.sodalive.chat.character.service.ChatCharacterService
+import kr.co.vividnext.sodalive.chat.character.service.PopularCharacterQuery
+import kr.co.vividnext.sodalive.chat.original.OriginalWork
+import kr.co.vividnext.sodalive.chat.original.OriginalWorkLink
+import kr.co.vividnext.sodalive.chat.original.OriginalWorkRepository
+import kr.co.vividnext.sodalive.chat.original.OriginalWorkTag
+import kr.co.vividnext.sodalive.chat.original.OriginalWorkTagMapping
+import kr.co.vividnext.sodalive.chat.original.dto.OriginalWorkDetailResponse
+import kr.co.vividnext.sodalive.chat.original.repository.OriginalWorkTagRepository
+import kr.co.vividnext.sodalive.chat.original.service.OriginalWorkQueryService
+import kr.co.vividnext.sodalive.configs.QueryDslConfig
+import kr.co.vividnext.sodalive.content.theme.AudioContentThemeQueryRepository
+import kr.co.vividnext.sodalive.explorer.CreatorRanking
+import kr.co.vividnext.sodalive.i18n.translation.LanguageTranslationTargetType
+import kr.co.vividnext.sodalive.i18n.translation.ResourceTranslationJobScheduler
+import kr.co.vividnext.sodalive.i18n.translation.TranslationJobRepository
+import kr.co.vividnext.sodalive.i18n.translation.TranslationJobScheduler
+import kr.co.vividnext.sodalive.i18n.translation.TranslationSourceExtractor
+import kr.co.vividnext.sodalive.member.Member
+import kr.co.vividnext.sodalive.member.MemberRole
+import kr.co.vividnext.sodalive.member.tag.CreatorTag
+import kr.co.vividnext.sodalive.member.tag.MemberCreatorTag
+import kr.co.vividnext.sodalive.rank.RankingRepository
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import org.mockito.Mockito
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest
+import org.springframework.context.ApplicationEventPublisher
+import org.springframework.context.annotation.Import
+import org.springframework.data.domain.PageRequest
+import org.springframework.transaction.annotation.Propagation
+import org.springframework.transaction.annotation.Transactional
+import org.springframework.transaction.support.TransactionTemplate
+import javax.persistence.EntityManager
+
+@DataJpaTest(
+    properties = [
+        "spring.cache.type=none",
+        "spring.datasource.url=jdbc:h2:mem:osiv-regression;MODE=MySQL;NON_KEYWORDS=VALUE;DB_CLOSE_ON_EXIT=FALSE"
+    ]
+)
+@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
+@Import(
+    QueryDslConfig::class,
+    ResourceTranslationJobScheduler::class,
+    TranslationSourceExtractor::class,
+    TranslationJobScheduler::class,
+    AudioContentThemeQueryRepository::class
+)
+@Transactional(propagation = Propagation.NOT_SUPPORTED)
+class OsivLazyLoadingRegressionTest @Autowired constructor(
+    private val chatCharacterRepository: ChatCharacterRepository,
+    private val tagRepository: ChatCharacterTagRepository,
+    private val valueRepository: ChatCharacterValueRepository,
+    private val hobbyRepository: ChatCharacterHobbyRepository,
+    private val goalRepository: ChatCharacterGoalRepository,
+    private val originalWorkRepository: OriginalWorkRepository,
+    private val resourceTranslationJobScheduler: ResourceTranslationJobScheduler,
+    private val translationJobRepository: TranslationJobRepository,
+    private val queryFactory: JPAQueryFactory,
+    private val transactionTemplate: TransactionTemplate,
+    private val entityManager: EntityManager
+) {
+    private val chatCharacterService = ChatCharacterService(
+        chatCharacterRepository = chatCharacterRepository,
+        tagRepository = tagRepository,
+        valueRepository = valueRepository,
+        hobbyRepository = hobbyRepository,
+        goalRepository = goalRepository,
+        popularCharacterQuery = Mockito.mock(PopularCharacterQuery::class.java),
+        imageRepository = Mockito.mock(CharacterImageRepository::class.java),
+        creatorMemberService = Mockito.mock(ChatCharacterCreatorMemberService::class.java),
+        imageHost = "https://cdn.test"
+    )
+    private val rankingRepository = RankingRepository(queryFactory, "https://cdn.test")
+    private val originalWorkQueryService = OriginalWorkQueryService(
+        originalWorkRepository = originalWorkRepository,
+        chatCharacterRepository = chatCharacterRepository
+    )
+    private val adminOriginalWorkService = AdminOriginalWorkService(
+        originalWorkRepository = originalWorkRepository,
+        chatCharacterRepository = chatCharacterRepository,
+        originalWorkTagRepository = Mockito.mock(OriginalWorkTagRepository::class.java),
+        applicationEventPublisher = Mockito.mock(ApplicationEventPublisher::class.java)
+    )
+
+    @Test
+    @DisplayName("캐릭터 상세 조회 결과는 트랜잭션 밖에서도 태그 이름을 읽을 수 있다")
+    fun shouldLoadCharacterDetailTagOutsideTransaction() {
+        val characterId = saveCharacterWithTag("detail")
+
+        val character = transactionTemplate.execute {
+            chatCharacterService.getCharacterDetail(characterId)
+        }!!
+
+        val tags = character.tagMappings.map { it.tag.tag }
+        assertEquals(listOf("detail-tag"), tags)
+    }
+
+    @Test
+    @DisplayName("캐릭터 상세 조회 결과는 트랜잭션 밖에서도 가치관, 취미, 목표 이름을 읽을 수 있다")
+    fun shouldLoadCharacterDetailMappingTargetsOutsideTransaction() {
+        val characterId = saveCharacterWithDetailMappings("detail-target")
+
+        val character = transactionTemplate.execute {
+            chatCharacterService.getCharacterDetail(characterId)
+        }!!
+
+        assertEquals(listOf("detail-target-value"), character.valueMappings.map { it.value.value })
+        assertEquals(listOf("detail-target-hobby"), character.hobbyMappings.map { it.hobby.hobby })
+        assertEquals(listOf("detail-target-goal"), character.goalMappings.map { it.goal.goal })
+    }
+
+    @Test
+    @DisplayName("공유 태그 기반 다른 캐릭터 조회 결과는 트랜잭션 밖에서도 태그 이름을 읽을 수 있다")
+    fun shouldLoadSharedTagCharactersOutsideTransaction() {
+        val characterId = saveTwoCharactersWithSharedTag()
+
+        val characters = transactionTemplate.execute {
+            chatCharacterService.getOtherCharactersBySharedTags(characterId, 10)
+        }!!
+
+        val tags = characters.single().tagMappings.map { it.tag.tag }
+        assertEquals(listOf("shared-tag"), tags)
+    }
+
+    @Test
+    @DisplayName("공유 태그 기반 다른 캐릭터 ID 조회 결과는 태그 조인 중복을 제거한다")
+    fun shouldReturnDistinctSharedTagCharacterIds() {
+        val characterId = saveCharactersWithDuplicateSharedTags()
+
+        val ids = transactionTemplate.execute {
+            chatCharacterRepository.findRandomIdsBySharedTags(
+                characterId,
+                PageRequest.of(0, 10)
+            )
+        }!!
+
+        assertEquals(ids.distinct(), ids)
+        assertEquals(2, ids.size)
+    }
+
+    @Test
+    @DisplayName("원작 상세 조회 결과는 트랜잭션 밖에서도 원작 링크와 태그 이름을 DTO로 변환할 수 있다")
+    fun shouldLoadOriginalWorkDetailRelationsOutsideTransaction() {
+        val originalWorkId = saveOriginalWorkWithLinkAndTag()
+
+        val originalWork = transactionTemplate.execute {
+            originalWorkQueryService.getOriginalWork(originalWorkId)
+        }!!
+
+        val response = OriginalWorkDetailResponse.from(
+            entity = originalWork,
+            characters = emptyList(),
+            translated = null
+        )
+        assertEquals(listOf("https://original.test/original"), response.originalLinks)
+        assertEquals(listOf("original-tag"), response.tags)
+    }
+
+    @Test
+    @DisplayName("관리자 원작 상세 조회 결과는 트랜잭션 밖에서도 DTO로 변환할 수 있다")
+    fun shouldLoadAdminOriginalWorkDetailRelationsOutsideTransaction() {
+        val originalWorkId = saveOriginalWorkWithLinkAndTag("admin-detail")
+
+        val originalWork = transactionTemplate.execute {
+            adminOriginalWorkService.getOriginalWork(originalWorkId)
+        }!!
+
+        val response = OriginalWorkResponse.from(originalWork)
+        assertEquals(listOf("https://original.test/admin-detail"), response.originalLinks)
+        assertEquals(listOf("admin-detail-tag"), response.tags)
+    }
+
+    @Test
+    @DisplayName("관리자 원작 목록 조회 결과는 트랜잭션 밖에서도 DTO로 변환할 수 있다")
+    fun shouldLoadAdminOriginalWorkPageRelationsOutsideTransaction() {
+        saveOriginalWorkWithLinkAndTag("admin-page")
+
+        val page = transactionTemplate.execute {
+            adminOriginalWorkService.getOriginalWorkPage(page = 0, size = 20)
+        }!!
+
+        val response = OriginalWorkResponse.from(page.content.single())
+        assertEquals(listOf("https://original.test/admin-page"), response.originalLinks)
+        assertEquals(listOf("admin-page-tag"), response.tags)
+    }
+
+    @Test
+    @DisplayName("관리자 원작 검색 결과는 트랜잭션 밖에서도 DTO로 변환할 수 있다")
+    fun shouldLoadAdminOriginalWorkSearchRelationsOutsideTransaction() {
+        saveOriginalWorkWithLinkAndTag("admin-search")
+
+        val originalWorks = transactionTemplate.execute {
+            adminOriginalWorkService.searchOriginalWorksAll("admin-search-title")
+        }!!
+
+        val response = OriginalWorkResponse.from(originalWorks.single())
+        assertEquals(listOf("https://original.test/admin-search"), response.originalLinks)
+        assertEquals(listOf("admin-search-tag"), response.tags)
+    }
+
+    @Test
+    @DisplayName("캐릭터 번역 job 스케줄러는 트랜잭션 밖 호출에서도 lazy 관계를 추출할 수 있다")
+    fun shouldScheduleCharacterTranslationOutsideTransaction() {
+        val characterId = saveCharacterForTranslation("translation")
+
+        resourceTranslationJobScheduler.scheduleResourceTranslation(
+            resourceType = LanguageTranslationTargetType.CHARACTER,
+            resourceId = characterId,
+            targetLanguage = "en"
+        )
+
+        val jobs = translationJobRepository.findAll()
+        assertEquals(
+            listOf(
+                "name",
+                "description",
+                "gender",
+                "personalityTrait",
+                "personalityDescription",
+                "backgroundTopic",
+                "backgroundDescription",
+                "tags"
+            ),
+            jobs.map { it.fieldKey }.sortedBy { expectedCharacterTranslationFieldOrder().indexOf(it) }
+        )
+    }
+
+    @Test
+    @DisplayName("크리에이터 랭킹 조회 결과는 트랜잭션 밖에서도 explorer creator DTO로 변환할 수 있다")
+    fun shouldLoadCreatorRankingTagsOutsideTransaction() {
+        saveCreatorRankingWithTag()
+
+        val creators = rankingRepository.getCreatorRankings(memberId = null)
+
+        val response = creators.single().toExplorerSectionCreator("https://cdn.test")
+        assertEquals("#creator-tag", response.tags)
+    }
+
+    private fun saveCharacterWithTag(seed: String): Long {
+        return transactionTemplate.execute {
+            val tag = kr.co.vividnext.sodalive.chat.character.ChatCharacterTag("$seed-tag")
+            entityManager.persist(tag)
+            val character = ChatCharacter(
+                characterUUID = "$seed-character-uuid",
+                name = "$seed-character",
+                description = "$seed-description",
+                systemPrompt = "$seed-system-prompt"
+            )
+            character.creatorMember = persistCreator("$seed-character-creator")
+            character.addTag(tag)
+            chatCharacterRepository.save(character).id!!
+        }!!
+    }
+
+    private fun saveTwoCharactersWithSharedTag(): Long {
+        return transactionTemplate.execute {
+            val tag = kr.co.vividnext.sodalive.chat.character.ChatCharacterTag("shared-tag")
+            entityManager.persist(tag)
+
+            val current = ChatCharacter(
+                characterUUID = "shared-current-uuid",
+                name = "shared-current",
+                description = "shared-current-description",
+                systemPrompt = "shared-current-system-prompt"
+            )
+            current.creatorMember = persistCreator("shared-current-creator")
+            current.addTag(tag)
+            chatCharacterRepository.save(current)
+
+            val other = ChatCharacter(
+                characterUUID = "shared-other-uuid",
+                name = "shared-other",
+                description = "shared-other-description",
+                systemPrompt = "shared-other-system-prompt"
+            )
+            other.creatorMember = persistCreator("shared-other-creator")
+            other.addTag(tag)
+            chatCharacterRepository.save(other)
+
+            current.id!!
+        }!!
+    }
+
+    private fun saveCharacterWithDetailMappings(seed: String): Long {
+        return transactionTemplate.execute {
+            val value = kr.co.vividnext.sodalive.chat.character.ChatCharacterValue("$seed-value")
+            val hobby = kr.co.vividnext.sodalive.chat.character.ChatCharacterHobby("$seed-hobby")
+            val goal = kr.co.vividnext.sodalive.chat.character.ChatCharacterGoal("$seed-goal")
+            entityManager.persist(value)
+            entityManager.persist(hobby)
+            entityManager.persist(goal)
+
+            val character = ChatCharacter(
+                characterUUID = "$seed-character-uuid",
+                name = "$seed-character",
+                description = "$seed-description",
+                systemPrompt = "$seed-system-prompt"
+            )
+            character.creatorMember = persistCreator("$seed-character-creator")
+            character.addValue(value)
+            character.addHobby(hobby)
+            character.addGoal(goal)
+            chatCharacterRepository.save(character).id!!
+        }!!
+    }
+
+    private fun saveCharacterForTranslation(seed: String): Long {
+        return transactionTemplate.execute {
+            val tag = kr.co.vividnext.sodalive.chat.character.ChatCharacterTag("$seed-tag")
+            entityManager.persist(tag)
+            val character = ChatCharacter(
+                characterUUID = "$seed-character-uuid",
+                name = "$seed-character",
+                description = "$seed-description",
+                languageCode = "ko",
+                systemPrompt = "$seed-system-prompt",
+                gender = "female"
+            )
+            character.creatorMember = persistCreator("$seed-character-creator")
+            character.addTag(tag)
+            character.addPersonality("$seed-trait", "$seed-personality-description")
+            character.addBackground("$seed-topic", "$seed-background-description")
+            chatCharacterRepository.save(character).id!!
+        }!!
+    }
+
+    private fun expectedCharacterTranslationFieldOrder(): List<String> {
+        return listOf(
+            "name",
+            "description",
+            "gender",
+            "personalityTrait",
+            "personalityDescription",
+            "backgroundTopic",
+            "backgroundDescription",
+            "tags"
+        )
+    }
+
+    private fun saveCharactersWithDuplicateSharedTags(): Long {
+        return transactionTemplate.execute {
+            val tagA = kr.co.vividnext.sodalive.chat.character.ChatCharacterTag("duplicate-shared-a")
+            val tagB = kr.co.vividnext.sodalive.chat.character.ChatCharacterTag("duplicate-shared-b")
+            entityManager.persist(tagA)
+            entityManager.persist(tagB)
+
+            val current = ChatCharacter(
+                characterUUID = "duplicate-current-uuid",
+                name = "duplicate-current",
+                description = "duplicate-current-description",
+                systemPrompt = "duplicate-current-system-prompt"
+            )
+            current.creatorMember = persistCreator("duplicate-current-creator")
+            current.addTag(tagA)
+            current.addTag(tagB)
+            chatCharacterRepository.save(current)
+
+            val otherWithTwoSharedTags = ChatCharacter(
+                characterUUID = "duplicate-other-two-uuid",
+                name = "duplicate-other-two",
+                description = "duplicate-other-two-description",
+                systemPrompt = "duplicate-other-two-system-prompt"
+            )
+            otherWithTwoSharedTags.creatorMember = persistCreator("duplicate-other-two-creator")
+            otherWithTwoSharedTags.addTag(tagA)
+            otherWithTwoSharedTags.addTag(tagB)
+            chatCharacterRepository.save(otherWithTwoSharedTags)
+
+            val otherWithOneSharedTag = ChatCharacter(
+                characterUUID = "duplicate-other-one-uuid",
+                name = "duplicate-other-one",
+                description = "duplicate-other-one-description",
+                systemPrompt = "duplicate-other-one-system-prompt"
+            )
+            otherWithOneSharedTag.creatorMember = persistCreator("duplicate-other-one-creator")
+            otherWithOneSharedTag.addTag(tagA)
+            chatCharacterRepository.save(otherWithOneSharedTag)
+
+            current.id!!
+        }!!
+    }
+
+    private fun saveOriginalWorkWithLinkAndTag(seed: String = "original"): Long {
+        return transactionTemplate.execute {
+            val originalWork = OriginalWork(
+                title = "$seed-title",
+                contentType = "webtoon",
+                category = "romance",
+                description = "$seed-description"
+            )
+            val link = OriginalWorkLink(
+                url = "https://original.test/$seed",
+                originalWork = originalWork
+            )
+            val tag = OriginalWorkTag("$seed-tag")
+            val tagMapping = OriginalWorkTagMapping(originalWork, tag)
+
+            entityManager.persist(tag)
+            originalWork.originalLinks.add(link)
+            originalWork.tagMappings.add(tagMapping)
+
+            originalWorkRepository.save(originalWork).id!!
+        }!!
+    }
+
+    private fun persistCreator(seed: String): Member {
+        val creator = Member(
+            email = "$seed@test.com",
+            password = "password",
+            nickname = seed,
+            role = MemberRole.CREATOR
+        )
+        entityManager.persist(creator)
+        return creator
+    }
+
+    private fun saveCreatorRankingWithTag() {
+        transactionTemplate.executeWithoutResult {
+            val creator = persistCreator("creator-osiv")
+
+            val tag = CreatorTag(tag = "creator-tag")
+            entityManager.persist(tag)
+            entityManager.persist(MemberCreatorTag(member = creator, tag = tag))
+
+            val ranking = CreatorRanking(ranking = 1)
+            ranking.member = creator
+            entityManager.persist(ranking)
+        }
+    }
+}