fix(content): 최근 댓글 오디오 후보를 크리에이터별로 제한한다

src/main/kotlin/kr/co/vividnext/sodalive/v2/content/recommendation/adapter/out/persistence/DefaultAudioRecommendationQueryRepository.kt

@@ -288,7 +288,8 @@ class DefaultAudioRecommendationQueryRepository(
                       else 0.0
                     end * 20.0
             """.trimIndent(),
-            requireComments = true
+            requireComments = true,
+            dedupeByCreator = true
         )
     }
 
@@ -325,12 +326,13 @@ class DefaultAudioRecommendationQueryRepository(
         limit: Int,
         sectionType: RecommendedSectionType,
         scoreExpression: String,
-        requireComments: Boolean = false
+        requireComments: Boolean = false,
+        dedupeByCreator: Boolean = false
     ): List<RecommendationSnapshotRecord> {
         val commentJoin = if (requireComments) "join" else "left join"
         val commentRequirement = if (requireComments) "and cm.comment_count is not null" else ""
-        val sql = """
-            select c.id, ($scoreExpression) score, rand() random_tie_breaker
+        val scoredSql = """
+            select c.id, c.member_id creator_id, ($scoreExpression) score, rand() random_tie_breaker
             from content c
             join member creator on creator.id = c.member_id
             join content_theme theme on theme.id = c.theme_id
@@ -372,9 +374,29 @@ class DefaultAudioRecommendationQueryRepository(
               and theme.is_active = true
               and (:includeAdult = true or c.is_adult = false)
               $commentRequirement
-            order by score desc, random_tie_breaker asc
-            limit :limit
         """.trimIndent()
+        val sql = if (dedupeByCreator) {
+            """
+                select id, score, random_tie_breaker
+                from (
+                    select scored.*, row_number() over (
+                        partition by creator_id
+                        order by score desc, random_tie_breaker asc
+                    ) creator_rank
+                    from ($scoredSql) scored
+                ) ranked
+                where creator_rank = 1
+                order by score desc, random_tie_breaker asc
+                limit :limit
+            """.trimIndent()
+        } else {
+            """
+                select id, score, random_tie_breaker
+                from ($scoredSql) scored
+                order by score desc, random_tie_breaker asc
+                limit :limit
+            """.trimIndent()
+        }
         return entityManager.createNativeQuery(sql)
             .setParameter("windowStart", windowStart)
             .setParameter("snapshotAt", snapshotAt)