src/main/kotlin/kr/co/vividnext/sodalive/v2/audio/recommendation/application/AudioRecommendationQueryService.kt

@@ -2,33 +2,67 @@ package kr.co.vividnext.sodalive.v2.audio.recommendation.application
 
 import kr.co.vividnext.sodalive.member.Member
 import kr.co.vividnext.sodalive.member.contentpreference.MemberContentPreferenceService
-import kr.co.vividnext.sodalive.member.contentpreference.isAdultVisibleByPolicy
 import kr.co.vividnext.sodalive.v2.audio.recommendation.domain.AudioRecommendationVisibility
 import kr.co.vividnext.sodalive.v2.audio.recommendation.domain.AudioRecommendations
 import kr.co.vividnext.sodalive.v2.audio.recommendation.port.out.AudioRecommendationQueryPort
 import kr.co.vividnext.sodalive.v2.recommendation.domain.RecommendedSectionType
+import kr.co.vividnext.sodalive.v2.recommendation.port.out.RecommendationSnapshotPort
+import kr.co.vividnext.sodalive.v2.recommendation.port.out.RecommendationSnapshotRecord
+import org.redisson.api.RedissonClient
 import org.springframework.stereotype.Service
-import org.springframework.transaction.annotation.Transactional
+import java.time.Duration
+import java.time.LocalDate
 import java.time.LocalDateTime
+import java.time.ZoneId
 
 @Service
 class AudioRecommendationQueryService(
     private val queryPort: AudioRecommendationQueryPort,
-    private val memberContentPreferenceService: MemberContentPreferenceService
+    private val memberContentPreferenceService: MemberContentPreferenceService,
+    private val snapshotPort: RecommendationSnapshotPort,
+    private val snapshotRefreshService: AudioRecommendationSnapshotRefreshService,
+    private val redissonClient: RedissonClient
 ) {
-    @Transactional(readOnly = true)
     fun getRecommendations(member: Member?): AudioRecommendations {
         val now = LocalDateTime.now()
         val canViewAdultContent = canViewAdultContent(member)
+        val visibility = if (canViewAdultContent) AudioRecommendationVisibility.ALL else AudioRecommendationVisibility.SAFE
+        val memberId = member?.id
+        val newAndHotSectionType = newAndHotSectionType(visibility)
+        val newAndHotSnapshots = snapshotPort.findLatestSnapshots(newAndHotSectionType, limit = NEW_AND_HOT_AUDIO_LIMIT)
+        val mostCommentedSnapshots = snapshotPort.findLatestSnapshots(
+            mostCommentedSectionType(visibility),
+            limit = MOST_COMMENTED_AUDIO_LIMIT
+        )
+        val recommendedSnapshots = snapshotPort.findLatestSnapshots(
+            recommendedAudioSectionType(visibility),
+            limit = RECOMMENDED_AUDIO_LIMIT
+        )
+        val refreshedNewAndHotSnapshots = refreshMissingNewAndHotSnapshots(newAndHotSectionType, newAndHotSnapshots)
+
         return AudioRecommendations(
-            banners = queryPort.findBanners(BANNER_LIMIT, member?.id, canViewAdultContent),
-            originalSeries = queryPort.findOriginalSeries(ORIGINAL_SERIES_LIMIT, member?.id, canViewAdultContent, now),
-            latestAudios = queryPort.findLatestAudios(LATEST_AUDIO_LIMIT, member?.id, canViewAdultContent, now),
-            newAndHotAudios = emptyList(),
-            freeAudios = queryPort.findFreeAudios(FREE_AUDIO_LIMIT, member?.id, canViewAdultContent, now),
-            pointAudios = queryPort.findPointAudios(POINT_AUDIO_LIMIT, member?.id, canViewAdultContent, now),
-            mostCommentedAudios = emptyList(),
-            recommendedAudios = emptyList()
+            banners = queryPort.findBanners(BANNER_LIMIT, memberId, canViewAdultContent),
+            originalSeries = queryPort.findOriginalSeries(ORIGINAL_SERIES_LIMIT, memberId, canViewAdultContent, now),
+            latestAudios = queryPort.findLatestAudios(LATEST_AUDIO_LIMIT, memberId, canViewAdultContent, now),
+            newAndHotAudios = queryPort.findAudioCardsByIds(
+                refreshedNewAndHotSnapshots.map { it.targetId },
+                memberId,
+                canViewAdultContent,
+                now
+            ),
+            freeAudios = queryPort.findFreeAudios(FREE_AUDIO_LIMIT, memberId, canViewAdultContent, now),
+            pointAudios = queryPort.findPointAudios(POINT_AUDIO_LIMIT, memberId, canViewAdultContent, now),
+            mostCommentedAudios = queryPort.findCommentedAudiosByIds(
+                mostCommentedSnapshots.map { it.targetId },
+                memberId,
+                canViewAdultContent
+            ),
+            recommendedAudios = queryPort.findAudioCardsByIds(
+                recommendedSnapshots.map { it.targetId },
+                memberId,
+                canViewAdultContent,
+                now
+            )
         )
     }
 
@@ -57,10 +91,32 @@ class AudioRecommendationQueryService(
         }
     }
 
+    private fun refreshMissingNewAndHotSnapshots(
+        sectionType: RecommendedSectionType,
+        snapshots: List<RecommendationSnapshotRecord>
+    ): List<RecommendationSnapshotRecord> {
+        if (snapshots.isNotEmpty()) return snapshots
+        val today = LocalDate.now(KST_ZONE)
+        val marker = redissonClient.getBucket<String>(newAndHotLazyRefreshMarkerKey(today))
+        if (!marker.setIfAbsent(LAZY_REFRESH_ATTEMPTED_VALUE, LAZY_REFRESH_MARKER_TTL)) {
+            return snapshots
+        }
+        runCatching {
+            snapshotRefreshService.refreshDailySnapshots()
+        }.onFailure { ex ->
+            marker.delete()
+            throw ex
+        }
+        return snapshotPort.findLatestSnapshots(sectionType, limit = NEW_AND_HOT_AUDIO_LIMIT)
+    }
+
+    private fun newAndHotLazyRefreshMarkerKey(date: LocalDate): String {
+        return "$LAZY_REFRESH_MARKER_KEY_PREFIX:$date"
+    }
+
     private fun canViewAdultContent(member: Member?): Boolean {
         if (member == null) return false
-        val preference = memberContentPreferenceService.initializeDefaultPreference(member)
-        return isAdultVisibleByPolicy(member, preference.isAdultContentVisible)
+        return memberContentPreferenceService.getStoredPreference(member).isAdult
     }
 
     companion object {
@@ -69,5 +125,12 @@ class AudioRecommendationQueryService(
         const val LATEST_AUDIO_LIMIT = 12
         const val FREE_AUDIO_LIMIT = 10
         const val POINT_AUDIO_LIMIT = 10
+        const val NEW_AND_HOT_AUDIO_LIMIT = 12
+        const val MOST_COMMENTED_AUDIO_LIMIT = 5
+        const val RECOMMENDED_AUDIO_LIMIT = 10
+        private const val LAZY_REFRESH_MARKER_KEY_PREFIX = "audio-recommendation:new-and-hot:lazy-refresh-attempted"
+        private const val LAZY_REFRESH_ATTEMPTED_VALUE = "1"
+        private val LAZY_REFRESH_MARKER_TTL: Duration = Duration.ofDays(2)
+        private val KST_ZONE: ZoneId = ZoneId.of("Asia/Seoul")
     }
 }

src/main/kotlin/kr/co/vividnext/sodalive/v2/audio/recommendation/domain/AudioRecommendationScorePolicy.kt

@@ -65,7 +65,7 @@ class AudioRecommendationScorePolicy {
     }
 
     private fun daysBetween(from: LocalDateTime, now: LocalDateTime): Long {
-        return ChronoUnit.DAYS.between(from.toLocalDate(), now.toLocalDate()).coerceAtLeast(0)
+        return ChronoUnit.DAYS.between(from, now).coerceAtLeast(0)
     }
 
     companion object {

src/test/kotlin/kr/co/vividnext/sodalive/v2/api/audio/recommendation/adapter/in/web/AudioRecommendationEndToEndTest.kt

@@ -0,0 +1,179 @@
+package kr.co.vividnext.sodalive.v2.api.audio.recommendation.adapter.`in`.web
+
+import kr.co.vividnext.sodalive.admin.content.series.genre.SeriesGenre
+import kr.co.vividnext.sodalive.content.AudioContent
+import kr.co.vividnext.sodalive.content.comment.AudioContentComment
+import kr.co.vividnext.sodalive.content.theme.AudioContentTheme
+import kr.co.vividnext.sodalive.creator.admin.content.series.Series
+import kr.co.vividnext.sodalive.creator.admin.content.series.SeriesContent
+import kr.co.vividnext.sodalive.member.Member
+import kr.co.vividnext.sodalive.member.MemberRole
+import kr.co.vividnext.sodalive.support.EmbeddedRedisInitializer
+import kr.co.vividnext.sodalive.v2.recommendation.adapter.out.persistence.RecommendationSnapshot
+import kr.co.vividnext.sodalive.v2.recommendation.domain.RecommendedSectionType
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
+import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.test.context.ContextConfiguration
+import org.springframework.test.web.servlet.MockMvc
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers.status
+import org.springframework.transaction.support.TransactionTemplate
+import java.time.LocalDateTime
+import javax.persistence.EntityManager
+
+@SpringBootTest(
+    properties = [
+        "cloud.aws.cloud-front.host=https://cdn.test",
+        "spring.cache.type=none",
+        "spring.datasource.url=jdbc:h2:mem:audio-recommendation-e2e;MODE=MySQL;NON_KEYWORDS=VALUE;DB_CLOSE_ON_EXIT=FALSE"
+    ]
+)
+@AutoConfigureMockMvc
+@ContextConfiguration(initializers = [EmbeddedRedisInitializer::class])
+class AudioRecommendationEndToEndTest @Autowired constructor(
+    private val mockMvc: MockMvc,
+    private val entityManager: EntityManager,
+    private val transactionTemplate: TransactionTemplate
+) {
+    @Test
+    @DisplayName("오디오 추천 API는 controller-service-repository를 거쳐 추천 섹션 응답을 반환한다")
+    fun shouldReturnRecommendationsThroughControllerServiceAndRepository() {
+        val fixture = createFixture()
+
+        mockMvc.perform(get("/api/v2/audio/recommendations"))
+            .andExpect(status().isOk)
+            .andExpect(jsonPath("$.success").value(true))
+            .andExpect(jsonPath("$.data.originalSeries").isArray)
+            .andExpect(jsonPath("$.data.originalSeries[0].seriesId").value(fixture.seriesId))
+            .andExpect(jsonPath("$.data.latestAudios").isArray)
+            .andExpect(jsonPath("$.data.latestAudios[0].audioContentId").value(fixture.audioContentId))
+            .andExpect(jsonPath("$.data.latestAudios[0].isOriginalSeries").value(true))
+            .andExpect(jsonPath("$.data.recommendedAudios").isArray)
+            .andExpect(jsonPath("$.data.recommendedAudios[0].audioContentId").value(fixture.audioContentId))
+            .andExpect(jsonPath("$.data.mostCommentedAudios[0].latestComment").value("latest e2e comment"))
+            .andExpect(
+                jsonPath("$.data.mostCommentedAudios[0].latestCommentWriterProfileImageUrl")
+                    .value("https://cdn.test/comment-writer.png")
+            )
+    }
+
+    private fun createFixture(): Fixture {
+        return transactionTemplate.execute {
+            val now = LocalDateTime.now().minusHours(1)
+            val creator = saveMember("audio-recommendation-e2e-creator", MemberRole.CREATOR)
+            val writer = saveMember("audio-recommendation-e2e-writer", MemberRole.USER, profileImage = "comment-writer.png")
+            val theme = saveTheme()
+            val audio = saveAudio(creator, theme, now)
+            val series = saveSeries(creator)
+            saveSeriesContent(series, audio)
+            saveComment(audio, writer, "latest e2e comment", now.plusMinutes(10))
+            saveSnapshot(RecommendedSectionType.NEW_AND_HOT_AUDIO_SAFE, audio.id!!, now)
+            saveSnapshot(RecommendedSectionType.MOST_COMMENTED_AUDIO_SAFE, audio.id!!, now)
+            saveSnapshot(RecommendedSectionType.RECOMMENDED_AUDIO_SAFE, audio.id!!, now)
+            entityManager.flush()
+            entityManager.clear()
+
+            Fixture(
+                seriesId = series.id!!,
+                audioContentId = audio.id!!
+            )
+        }!!
+    }
+
+    private fun saveMember(nickname: String, role: MemberRole, profileImage: String? = "$nickname.png"): Member {
+        val member = Member(
+            email = "$nickname@test.com",
+            password = "password",
+            nickname = nickname,
+            profileImage = profileImage,
+            role = role
+        )
+        entityManager.persist(member)
+        return member
+    }
+
+    private fun saveTheme(): AudioContentTheme {
+        val theme = AudioContentTheme(theme = "recommendation-e2e-theme", image = "theme.png", isActive = true)
+        entityManager.persist(theme)
+        return theme
+    }
+
+    private fun saveAudio(creator: Member, theme: AudioContentTheme, releaseDate: LocalDateTime): AudioContent {
+        val audio = AudioContent(
+            title = "audio-recommendation-e2e",
+            detail = "detail",
+            languageCode = "ko",
+            releaseDate = releaseDate,
+            isAdult = false,
+            price = 0,
+            isPointAvailable = true
+        )
+        audio.member = creator
+        audio.theme = theme
+        audio.isActive = true
+        audio.coverImage = "audio-recommendation-e2e.png"
+        audio.duration = "00:10"
+        entityManager.persist(audio)
+        return audio
+    }
+
+    private fun saveSeries(creator: Member): Series {
+        val genre = SeriesGenre("recommendation-e2e-genre")
+        entityManager.persist(genre)
+        val series = Series(
+            title = "recommendation-e2e-series",
+            introduction = "intro",
+            isOriginal = true,
+            isAdult = false,
+            isActive = true
+        )
+        series.member = creator
+        series.genre = genre
+        series.coverImage = "series.png"
+        entityManager.persist(series)
+        return series
+    }
+
+    private fun saveSeriesContent(series: Series, audio: AudioContent) {
+        val seriesContent = SeriesContent()
+        seriesContent.series = series
+        seriesContent.content = audio
+        entityManager.persist(seriesContent)
+    }
+
+    private fun saveComment(
+        audio: AudioContent,
+        writer: Member,
+        commentBody: String,
+        createdAt: LocalDateTime
+    ): AudioContentComment {
+        val comment = AudioContentComment(comment = commentBody, languageCode = "ko", isActive = true)
+        comment.audioContent = audio
+        comment.member = writer
+        comment.createdAt = createdAt
+        comment.updatedAt = createdAt
+        entityManager.persist(comment)
+        return comment
+    }
+
+    private fun saveSnapshot(sectionType: RecommendedSectionType, targetId: Long, snapshotAt: LocalDateTime) {
+        entityManager.persist(
+            RecommendationSnapshot(
+                sectionType = sectionType,
+                targetId = targetId,
+                score = 1.0,
+                snapshotAt = snapshotAt,
+                randomTieBreaker = 0.0
+            )
+        )
+    }
+
+    private data class Fixture(
+        val seriesId: Long,
+        val audioContentId: Long
+    )
+}

src/test/kotlin/kr/co/vividnext/sodalive/v2/audio/recommendation/application/AudioRecommendationQueryServiceTest.kt

@@ -1,18 +1,36 @@
 package kr.co.vividnext.sodalive.v2.audio.recommendation.application
 
+import kr.co.vividnext.sodalive.content.ContentType
 import kr.co.vividnext.sodalive.member.contentpreference.MemberContentPreferenceService
+import kr.co.vividnext.sodalive.member.contentpreference.ViewerContentPreference
 import kr.co.vividnext.sodalive.v2.audio.recommendation.domain.AudioRecommendationVisibility
 import kr.co.vividnext.sodalive.v2.audio.recommendation.port.out.AudioRecommendationQueryPort
 import kr.co.vividnext.sodalive.v2.recommendation.domain.RecommendedSectionType
+import kr.co.vividnext.sodalive.v2.recommendation.port.out.RecommendationSnapshotPort
+import kr.co.vividnext.sodalive.v2.recommendation.port.out.RecommendationSnapshotRecord
 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.redisson.api.RBucket
+import org.redisson.api.RedissonClient
+import java.time.Duration
+import java.time.LocalDateTime
 
 class AudioRecommendationQueryServiceTest {
     private val queryPort = Mockito.mock(AudioRecommendationQueryPort::class.java)
     private val preferenceService = Mockito.mock(MemberContentPreferenceService::class.java)
-    private val service = AudioRecommendationQueryService(queryPort, preferenceService)
+    private val snapshotPort = Mockito.mock(RecommendationSnapshotPort::class.java)
+    private val refreshService = Mockito.mock(AudioRecommendationSnapshotRefreshService::class.java)
+    private val redissonClient = Mockito.mock(RedissonClient::class.java)
+    private val lazyRefreshMarker = Mockito.mock(RBucket::class.java) as RBucket<String>
+    private val service = AudioRecommendationQueryService(
+        queryPort,
+        preferenceService,
+        snapshotPort,
+        refreshService,
+        redissonClient
+    )
 
     @Test
     @DisplayName("비회원은 SAFE visibility를 사용한다")
@@ -20,6 +38,130 @@ class AudioRecommendationQueryServiceTest {
         assertEquals(AudioRecommendationVisibility.SAFE, service.resolveVisibility(null))
     }
 
+    @Test
+    @DisplayName("조회 서비스는 SAFE 스냅샷을 lazy refresh 후 상세 섹션으로 조립한다")
+    fun shouldBuildRecommendationsFromSafeSnapshotsWithLazyRefresh() {
+        val snapshot = RecommendationSnapshotRecord(
+            sectionType = RecommendedSectionType.NEW_AND_HOT_AUDIO_SAFE,
+            targetId = 1L,
+            score = 10.0,
+            snapshotAt = LocalDateTime.now(),
+            randomTieBreaker = 1.0
+        )
+        Mockito.doReturn(emptyList<RecommendationSnapshotRecord>(), listOf(snapshot))
+            .`when`(snapshotPort)
+            .findLatestSnapshots(
+                RecommendedSectionType.NEW_AND_HOT_AUDIO_SAFE,
+                0,
+                AudioRecommendationQueryService.NEW_AND_HOT_AUDIO_LIMIT
+            )
+        Mockito.doReturn(emptyList<RecommendationSnapshotRecord>())
+            .`when`(snapshotPort)
+            .findLatestSnapshots(
+                RecommendedSectionType.MOST_COMMENTED_AUDIO_SAFE,
+                0,
+                AudioRecommendationQueryService.MOST_COMMENTED_AUDIO_LIMIT
+            )
+        Mockito.doReturn(emptyList<RecommendationSnapshotRecord>())
+            .`when`(snapshotPort)
+            .findLatestSnapshots(
+                RecommendedSectionType.RECOMMENDED_AUDIO_SAFE,
+                0,
+                AudioRecommendationQueryService.RECOMMENDED_AUDIO_LIMIT
+            )
+        allowLazyRefreshOnce()
+
+        val recommendations = service.getRecommendations(null)
+
+        assertEquals(0, recommendations.mostCommentedAudios.size)
+        Mockito.verify(refreshService).refreshDailySnapshots()
+        Mockito.verify(snapshotPort, Mockito.times(1)).findLatestSnapshots(
+            RecommendedSectionType.MOST_COMMENTED_AUDIO_SAFE,
+            0,
+            AudioRecommendationQueryService.MOST_COMMENTED_AUDIO_LIMIT
+        )
+        Mockito.verify(snapshotPort, Mockito.times(1)).findLatestSnapshots(
+            RecommendedSectionType.RECOMMENDED_AUDIO_SAFE,
+            0,
+            AudioRecommendationQueryService.RECOMMENDED_AUDIO_LIMIT
+        )
+        Mockito.verify(queryPort).findBanners(AudioRecommendationQueryService.BANNER_LIMIT, null, false)
+        Mockito.verify(queryPort).findAudioCardsByIds(
+            eqValue(listOf(1L)),
+            Mockito.isNull(),
+            eqValue(false),
+            anyLocalDateTime()
+        )
+    }
+
+    @Test
+    @DisplayName("New & Hot lazy refresh는 보강 후에도 비어 있으면 같은 KST 날짜에 다시 실행하지 않는다")
+    fun shouldAttemptEmptyNewAndHotLazyRefreshOncePerKstDate() {
+        Mockito.doReturn(emptyList<RecommendationSnapshotRecord>())
+            .`when`(snapshotPort)
+            .findLatestSnapshots(
+                RecommendedSectionType.NEW_AND_HOT_AUDIO_SAFE,
+                0,
+                AudioRecommendationQueryService.NEW_AND_HOT_AUDIO_LIMIT
+            )
+        Mockito.doReturn(emptyList<RecommendationSnapshotRecord>())
+            .`when`(snapshotPort)
+            .findLatestSnapshots(
+                RecommendedSectionType.MOST_COMMENTED_AUDIO_SAFE,
+                0,
+                AudioRecommendationQueryService.MOST_COMMENTED_AUDIO_LIMIT
+            )
+        Mockito.doReturn(emptyList<RecommendationSnapshotRecord>())
+            .`when`(snapshotPort)
+            .findLatestSnapshots(
+                RecommendedSectionType.RECOMMENDED_AUDIO_SAFE,
+                0,
+                AudioRecommendationQueryService.RECOMMENDED_AUDIO_LIMIT
+            )
+        allowLazyRefreshOnce()
+
+        service.getRecommendations(null)
+        service.getRecommendations(null)
+
+        Mockito.verify(refreshService, Mockito.times(1)).refreshDailySnapshots()
+    }
+
+    @Test
+    @DisplayName("인증 회원 성인 정책은 조회용 저장 preference를 사용한다")
+    fun shouldUseStoredPreferenceForMemberAdultVisibility() {
+        val member = kr.co.vividnext.sodalive.member.Member(
+            email = "adult@test.com",
+            password = "password",
+            nickname = "adult",
+            role = kr.co.vividnext.sodalive.member.MemberRole.USER
+        )
+        Mockito.doReturn(
+            ViewerContentPreference(
+                countryCode = "KR",
+                isAdultContentVisible = true,
+                contentType = ContentType.ALL,
+                isAdult = true
+            )
+        ).`when`(preferenceService).getStoredPreference(member)
+        Mockito.doReturn(listOf(snapshot(RecommendedSectionType.NEW_AND_HOT_AUDIO_ALL, 10L)))
+            .`when`(snapshotPort)
+            .findLatestSnapshots(
+                RecommendedSectionType.NEW_AND_HOT_AUDIO_ALL,
+                0,
+                AudioRecommendationQueryService.NEW_AND_HOT_AUDIO_LIMIT
+            )
+
+        service.getRecommendations(member)
+
+        Mockito.verify(preferenceService).getStoredPreference(member)
+        Mockito.verify(preferenceService, Mockito.never()).initializeDefaultPreference(member)
+        Mockito.verify(snapshotPort).findLatestSnapshots(
+            RecommendedSectionType.NEW_AND_HOT_AUDIO_ALL,
+            0,
+            AudioRecommendationQueryService.NEW_AND_HOT_AUDIO_LIMIT
+        )
+    }
+
     @Test
     @DisplayName("visibility와 섹션 조합은 신규 RecommendedSectionType으로 매핑된다")
     fun shouldMapVisibilityToAudioSectionTypes() {
@@ -48,4 +190,30 @@ class AudioRecommendationQueryServiceTest {
             service.recommendedAudioSectionType(AudioRecommendationVisibility.ALL)
         )
     }
+
+    private fun anyLocalDateTime(): LocalDateTime {
+        return Mockito.any(LocalDateTime::class.java) ?: LocalDateTime.now()
+    }
+
+    private fun snapshot(sectionType: RecommendedSectionType, targetId: Long): RecommendationSnapshotRecord {
+        return RecommendationSnapshotRecord(
+            sectionType = sectionType,
+            targetId = targetId,
+            score = 10.0,
+            snapshotAt = LocalDateTime.now(),
+            randomTieBreaker = 1.0
+        )
+    }
+
+    private fun <T> eqValue(value: T): T {
+        return Mockito.eq(value) ?: value
+    }
+
+    private fun allowLazyRefreshOnce() {
+        Mockito.doReturn(lazyRefreshMarker).`when`(redissonClient).getBucket<String>(Mockito.anyString())
+        Mockito.doReturn(true, false).`when`(lazyRefreshMarker).setIfAbsent(
+            eqValue("1"),
+            eqValue(Duration.ofDays(2))
+        )
+    }
 }

src/test/kotlin/kr/co/vividnext/sodalive/v2/audio/recommendation/domain/AudioRecommendationScorePolicyTest.kt

@@ -41,4 +41,15 @@ class AudioRecommendationScorePolicyTest {
         assertEquals(1.0, policy.commentRecencyMultiplier(now.minusDays(14), now))
         assertEquals(0.0, policy.commentRecencyMultiplier(now.minusDays(15), now))
     }
+
+    @Test
+    @DisplayName("최신성 일수는 날짜 경계가 아니라 24시간 경과 기준으로 계산한다")
+    fun shouldCalculateRecencyDaysByElapsedTwentyFourHours() {
+        val releaseDate = LocalDateTime.of(2026, 6, 19, 23, 59, 59)
+        val snapshotAt = LocalDateTime.of(2026, 6, 23, 0, 0)
+
+        assertEquals(1.3, policy.newAndHotRecencyMultiplier(releaseDate, snapshotAt))
+        assertEquals(1.3, policy.recommendedAudioRecencyMultiplier(releaseDate, snapshotAt))
+        assertEquals(1.3, policy.commentRecencyMultiplier(releaseDate, snapshotAt))
+    }
 }