refactor: Instant를 모두 LocalDateTime으로 변경

src/main/java/net/teumteum/alert/domain/AlertRepository.java

@@ -1,6 +1,6 @@
 package net.teumteum.alert.domain;
 
-import java.time.Instant;
+import java.time.LocalDateTime;
 import java.util.List;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
@@ -11,5 +11,5 @@ public interface AlertRepository extends JpaRepository<Alert, Long> {
     List<Alert> findAllByUserId(Long userId);
 
     @Query("select a from alert as a where a.createdAt <= :createdAt")
-    List<Alert> findAllByCreatedAt(@Param("createdAt") Instant createdAt);
+    List<Alert> findAllByCreatedAt(@Param("createdAt") LocalDateTime createdAt);
 }

src/main/java/net/teumteum/alert/domain/AlertService.java

@@ -1,6 +1,6 @@
 package net.teumteum.alert.domain;
 
-import java.time.Instant;
+import java.time.LocalDateTime;
 import java.time.temporal.ChronoUnit;
 import lombok.RequiredArgsConstructor;
 import net.teumteum.alert.domain.response.AlertsResponse;
@@ -33,7 +33,7 @@ public AlertsResponse findAllByUserId(Long userId) {
     @Transactional
     @Scheduled(cron = EVERY_12AM)
     public void deleteOneMonthBeforeAlert() {
-        var deleteTargets = alertRepository.findAllByCreatedAt(Instant.now().minus(1, ChronoUnit.MONTHS));
+        var deleteTargets = alertRepository.findAllByCreatedAt(LocalDateTime.now().minus(1, ChronoUnit.MONTHS));
         alertRepository.deleteAllInBatch(deleteTargets);
     }
 }

src/main/java/net/teumteum/alert/domain/response/AlertsResponse.java

@@ -1,6 +1,6 @@
 package net.teumteum.alert.domain.response;
 
-import java.time.Instant;
+import java.time.LocalDateTime;
 import java.util.List;
 import net.teumteum.alert.domain.Alert;
 
@@ -26,7 +26,7 @@ public record AlertResponse(
         String title,
         String body,
         String type,
-        Instant createdAt,
+        LocalDateTime createdAt,
         boolean isRead
     ) {
 

src/main/java/net/teumteum/core/entity/TimeBaseEntity.java

@@ -3,27 +3,27 @@
 import jakarta.persistence.Column;
 import jakarta.persistence.EntityListeners;
 import jakarta.persistence.MappedSuperclass;
+import java.time.LocalDateTime;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.experimental.SuperBuilder;
 import org.springframework.data.annotation.CreatedDate;
 import org.springframework.data.annotation.LastModifiedDate;
 import org.springframework.data.jpa.domain.support.AuditingEntityListener;
 
-import java.time.Instant;
-
 @Getter
 @SuperBuilder
 @NoArgsConstructor
 @MappedSuperclass
 @EntityListeners(AuditingEntityListener.class)
 public abstract class TimeBaseEntity {
+
     @CreatedDate
     @Column(name = "created_at", nullable = false, updatable = false)
-    private Instant createdAt;
+    private LocalDateTime createdAt;
 
     @LastModifiedDate
     @Column(name = "updated_at", nullable = false)
-    private Instant updatedAt;
+    private LocalDateTime updatedAt;
 }