feat(banner): 예약 노출 시각 컬럼과 DDL을 추가한다

docs/20261027_콘텐츠배너예약기간/alter-content-banner-reservation.sql

@@ -0,0 +1,3 @@
+ALTER TABLE content_banner
+    ADD COLUMN start_date TIMESTAMP NULL DEFAULT NULL COMMENT '배너 노출 시작 시각 (UTC, NULL이면 시작 제한 없음)',
+    ADD COLUMN end_date TIMESTAMP NULL DEFAULT NULL COMMENT '배너 노출 종료 시각 (UTC, NULL이면 종료 제한 없음)';

src/main/kotlin/kr/co/vividnext/sodalive/content/main/banner/AudioContentBanner.kt

@@ -6,6 +6,7 @@ import kr.co.vividnext.sodalive.creator.admin.content.series.Series
 import kr.co.vividnext.sodalive.event.Event
 import kr.co.vividnext.sodalive.i18n.Lang
 import kr.co.vividnext.sodalive.member.Member
+import java.time.LocalDateTime
 import javax.persistence.Column
 import javax.persistence.Entity
 import javax.persistence.EnumType
@@ -50,6 +51,12 @@ data class AudioContentBanner(
 
     @Column(nullable = true)
     var link: String? = null
+
+    @Column(name = "start_date", nullable = true)
+    var startDate: LocalDateTime? = null
+
+    @Column(name = "end_date", nullable = true)
+    var endDate: LocalDateTime? = null
 }
 
 enum class AudioContentBannerType {