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

@@ -18,6 +18,16 @@ class RecommendationScorePolicy {
         }
     }
 
+    fun calculateCheerCreatorNewBoost(debutAt: LocalDateTime, now: LocalDateTime): Double {
+        val days = ChronoUnit.DAYS.between(debutAt.toLocalDate(), now.toLocalDate())
+        return when {
+            days <= RecommendationScoreSpec.NEW_BOOST_10_DAY_LIMIT -> RecommendationScoreSpec.CHEER_NEW_BOOST_10_DAYS
+            days <= RecommendationScoreSpec.NEW_BOOST_20_DAY_LIMIT -> RecommendationScoreSpec.CHEER_NEW_BOOST_20_DAYS
+            days <= RecommendationScoreSpec.NEW_BOOST_30_DAY_LIMIT -> RecommendationScoreSpec.CHEER_NEW_BOOST_30_DAYS
+            else -> RecommendationScoreSpec.DEFAULT_NEW_BOOST
+        }
+    }
+
     fun calculateDebutCreatorScore(
         followIncrease: Long,
         contentActivityScore: Long,

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

@@ -13,7 +13,7 @@ object RecommendationScoreSpec {
     const val AI_ACTIVE_USER_WEIGHT = 0.35
     const val AI_FOLLOW_INCREASE_WEIGHT = 0.20
 
-    const val CHEER_DONATION_AMOUNT_WEIGHT = 0.6
+    const val CHEER_DONATION_AMOUNT_WEIGHT = 0.45
     const val CHEER_FAN_TALK_WEIGHT = 0.3
     const val CHEER_DONATION_COUNT_WEIGHT = 0.1
 
@@ -27,5 +27,8 @@ object RecommendationScoreSpec {
     const val AI_NEW_BOOST_10_DAYS = 1.15
     const val AI_NEW_BOOST_20_DAYS = 1.10
     const val AI_NEW_BOOST_30_DAYS = 1.05
+    const val CHEER_NEW_BOOST_10_DAYS = 1.15
+    const val CHEER_NEW_BOOST_20_DAYS = 1.10
+    const val CHEER_NEW_BOOST_30_DAYS = 1.05
     const val DEFAULT_NEW_BOOST = 1.0
 }

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

@@ -78,18 +78,37 @@ class RecommendationScorePolicyTest {
     @Test
     @DisplayName("최근 응원 추천 점수는 후원 금액, 팬 Talk 수, 후원 수에 가중치를 적용한다")
     fun shouldCalculateCheerScore() {
-        assertEquals(0.6, RecommendationScoreSpec.CHEER_DONATION_AMOUNT_WEIGHT, 0.0001)
+        assertEquals(0.45, RecommendationScoreSpec.CHEER_DONATION_AMOUNT_WEIGHT, 0.0001)
         assertEquals(0.3, RecommendationScoreSpec.CHEER_FAN_TALK_WEIGHT, 0.0001)
         assertEquals(0.1, RecommendationScoreSpec.CHEER_DONATION_COUNT_WEIGHT, 0.0001)
 
-        val score = policy.calculateCheerScore(
+        assertEquals(0.0, policy.calculateCheerScore(0, 0, 0, 1.0), 0.0001)
-            donationAmount = 1000,
+        assertEquals(45.0, policy.calculateCheerScore(100, 0, 0, 1.0), 0.0001)
-            fanTalkCount = 20,
+        assertEquals(3.0, policy.calculateCheerScore(0, 10, 0, 1.0), 0.0001)
-            donationCount = 10,
+        assertEquals(1.0, policy.calculateCheerScore(0, 0, 10, 1.0), 0.0001)
-            newBoost = 1.2
+        assertEquals(49.0, policy.calculateCheerScore(100, 10, 10, 1.0), 0.0001)
-        )
+        assertEquals(56.35, policy.calculateCheerScore(100, 10, 10, 1.15), 0.0001)
+    }
 
-        assertEquals(728.4, score, 0.0001)
+    @Test
+    @DisplayName("최근 응원 크리에이터 신규 부스트는 데뷔일 기준 10일/20일/30일 구간을 적용한다")
+    fun shouldApplyCheerCreatorNewBoostByDebutDays() {
+        val now = LocalDateTime.of(2026, 5, 30, 12, 0)
+
+        assertEquals(1.15, RecommendationScoreSpec.CHEER_NEW_BOOST_10_DAYS, 0.0001)
+        assertEquals(1.10, RecommendationScoreSpec.CHEER_NEW_BOOST_20_DAYS, 0.0001)
+        assertEquals(1.05, RecommendationScoreSpec.CHEER_NEW_BOOST_30_DAYS, 0.0001)
+        assertEquals(1.15, policy.calculateCheerCreatorNewBoost(now, now), 0.0001)
+        assertEquals(1.15, policy.calculateCheerCreatorNewBoost(now.minusDays(10), now), 0.0001)
+        assertEquals(1.10, policy.calculateCheerCreatorNewBoost(now.minusDays(11), now), 0.0001)
+        assertEquals(1.10, policy.calculateCheerCreatorNewBoost(now.minusDays(20), now), 0.0001)
+        assertEquals(1.05, policy.calculateCheerCreatorNewBoost(now.minusDays(21), now), 0.0001)
+        assertEquals(1.05, policy.calculateCheerCreatorNewBoost(now.minusDays(30), now), 0.0001)
+        assertEquals(1.0, policy.calculateCheerCreatorNewBoost(now.minusDays(31), now), 0.0001)
+
+        assertEquals(1.5, policy.calculateCreatorNewBoost(now.minusDays(10), now), 0.0001)
+        assertEquals(1.3, policy.calculateCreatorNewBoost(now.minusDays(20), now), 0.0001)
+        assertEquals(1.2, policy.calculateCreatorNewBoost(now.minusDays(30), now), 0.0001)
     }
 
     @Test