Вторая часть по кэшу

client-mobile/chats/data/local/mappers/ChatMappers.kt

@@ -7,6 +7,7 @@ import chats.domain.model.Chat
  * Преобразует Domain Chat в Entity
  */
 fun Chat.toEntity(): ChatEntity {
+    val timestamp = this.lastMessage?.createdAt?.let { parseTimestamp(it) }
     return ChatEntity(
         localId = this.id.takeIf { it.isNotBlank() } ?: java.util.UUID.randomUUID().toString(),
         remoteId = this.id,
@@ -15,7 +16,7 @@ fun Chat.toEntity(): ChatEntity {
         avatar = this.avatar,
         unreadCount = this.unreadCount,
         lastMessageText = this.lastMessage?.content,
-        lastMessageTimestamp = this.lastMessage?.createdAt
+        lastMessageTimestamp = timestamp
     )
 }
 
@@ -32,3 +33,14 @@ fun ChatEntity.toDomain(): Chat {
         lastMessage = null // lastMessage загружается отдельно
     )
 }
+
+/**
+ * Парсит ISO-8601 timestamp в Long (millis)
+ */
+private fun parseTimestamp(isoTimestamp: String): Long? {
+    return try {
+        java.time.ZonedDateTime.parse(isoTimestamp).toInstant().toEpochMilli()
+    } catch (e: Exception) {
+        null
+    }
+}