feat(be): compute updatedAt in Asia/Seoul

Author: beekeeper24

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatmessage/dto/ChatMessageResponse.kt

@@ -1,14 +1,15 @@
 package com.back.koreaTravelGuide.domain.userChat.chatmessage.dto
 
 import com.back.koreaTravelGuide.domain.userChat.chatmessage.entity.ChatMessage
-import java.time.Instant
+import java.time.ZoneId
+import java.time.ZonedDateTime
 
 data class ChatMessageResponse(
     val id: Long?,
     val roomId: Long,
     val senderId: Long,
     val content: String,
-    val createdAt: Instant,
+    val createdAt: ZonedDateTime = ZonedDateTime.now(ZoneId.of("Asia/Seoul")),
 ) {
     companion object {
         fun from(message: ChatMessage): ChatMessageResponse {

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatmessage/entity/ChatMessage.kt

@@ -7,7 +7,8 @@ import jakarta.persistence.GenerationType
 import jakarta.persistence.Id
 import jakarta.persistence.Index
 import jakarta.persistence.Table
-import java.time.Instant
+import java.time.ZoneId
+import java.time.ZonedDateTime
 
 @Entity
 @Table(
@@ -24,5 +25,5 @@ data class ChatMessage(
     @Column(nullable = false, columnDefinition = "text")
     val content: String,
     @Column(name = "created_at", nullable = false)
-    val createdAt: Instant = Instant.now(),
+    val createdAt: ZonedDateTime = ZonedDateTime.now(ZoneId.of("Asia/Seoul")),
 )

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatroom/dto/ChatRoomResponse.kt

@@ -1,14 +1,15 @@
 package com.back.koreaTravelGuide.domain.userChat.chatroom.dto
 
 import com.back.koreaTravelGuide.domain.userChat.chatroom.entity.ChatRoom
-import java.time.Instant
+import java.time.ZoneId
+import java.time.ZonedDateTime
 
 data class ChatRoomResponse(
     val id: Long?,
     val title: String,
     val guideId: Long,
     val userId: Long,
-    val updatedAt: Instant,
+    val updatedAt: ZonedDateTime = ZonedDateTime.now(ZoneId.of("Asia/Seoul")),
     val lastMessageId: Long?,
 ) {
     companion object {

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatroom/entity/ChatRoom.kt

@@ -7,7 +7,8 @@ import jakarta.persistence.GenerationType
 import jakarta.persistence.Id
 import jakarta.persistence.Index
 import jakarta.persistence.Table
-import java.time.Instant
+import java.time.ZoneId
+import java.time.ZonedDateTime
 
 @Entity
 @Table(
@@ -24,7 +25,7 @@ data class ChatRoom(
     @Column(name = "user_id", nullable = false)
     val userId: Long,
     @Column(name = "updated_at", nullable = false)
-    val updatedAt: Instant = Instant.now(),
+    val updatedAt: ZonedDateTime = ZonedDateTime.now(ZoneId.of("Asia/Seoul")),
     @Column(name = "last_message_id")
     val lastMessageId: Long? = null,
 )

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatroom/service/ChatRoomService.kt

@@ -6,7 +6,8 @@ import com.back.koreaTravelGuide.domain.userChat.chatroom.repository.ChatRoomRep
 import org.springframework.security.access.AccessDeniedException
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
-import java.time.Instant
+import java.time.ZoneId
+import java.time.ZonedDateTime
 import java.util.NoSuchElementException
 
 @Service
@@ -27,7 +28,12 @@ class ChatRoomService(
         // 2) 없으면 생성 (동시요청은 DB 유니크 인덱스로 가드)
         val title = "Guide-$guideId · User-$userId"
         return roomRepository.save(
-            ChatRoom(title = title, guideId = guideId, userId = userId, updatedAt = Instant.now()),
+            ChatRoom(
+                title = title,
+                guideId = guideId,
+                userId = userId,
+                updatedAt = ZonedDateTime.now(ZoneId.of("Asia/Seoul")),
+            ),
         )
     }