Develop

src/main/java/com/jiwon/mylog/domain/post/entity/Post.java

@@ -79,7 +79,7 @@ public class Post extends BaseEntity {
     private List<PostImage> images = new ArrayList<>();
 
     @Builder.Default
-    @OneToMany(mappedBy = "post")
+    @OneToMany(mappedBy = "post", cascade = CascadeType.ALL, orphanRemoval = true)
     private List<PostTag> postTags = new ArrayList<>();
 
     @Builder.Default
@@ -112,12 +112,12 @@ public void update(PostRequest request, Category category, List<Tag> tags) {
     }
 
     private void updateTags(List<Tag> tags) {
-        this.postTags.clear();
-        this.postTags.addAll(
-                tags.stream()
-                        .map(tag -> PostTag.createPostTag(this, tag))
-                        .toList()
-        );
+        this.postTags.removeIf(pt -> !tags.contains(pt.getTag()));
+        for (Tag tag : tags) {
+            if (postTags.stream().noneMatch(pt -> pt.getTag().equals(tag))) {
+                postTags.add(PostTag.createPostTag(this, tag));
+            }
+        }
     }
 
     public void delete() {

src/main/java/com/jiwon/mylog/domain/tag/entity/PostTag.java

@@ -7,12 +7,21 @@
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import jakarta.persistence.UniqueConstraint;
 import lombok.Getter;
 import lombok.Setter;
 
 @Getter
 @Setter
 @Entity
+@Table(
+        name = "post_tag",
+        uniqueConstraints = @UniqueConstraint(
+                name = "post_tag_uk",
+                columnNames = {"post_id", "tag_id"}
+        )
+)
 public class PostTag {
 
     @Id

src/main/java/com/jiwon/mylog/global/redis/RedisUtil.java

@@ -1,5 +1,6 @@
 package com.jiwon.mylog.global.redis;
 
+import com.jiwon.mylog.global.redis.key.RedisKey;
 import java.time.Duration;
 import java.time.LocalDate;
 import java.time.format.DateTimeParseException;
@@ -111,11 +112,11 @@ public void addPostViewUser(String key, String value) {
         redisTemplate.expire(key, Duration.ofHours(12));
     }
 
-    public Map<Long, Integer> getAllPostView(String keyPrefix) {
-        Set<String> keys = redisTemplate.keys(keyPrefix);
+    public Map<Long, Integer> getAllPostView(RedisKey keyPattern) {
+        Set<String> keys = redisTemplate.keys(keyPattern.getPrefix() + "*");
         return keys.stream()
                 .collect(Collectors.toMap(
-                        key -> Long.parseLong(key.replace(keyPrefix, "")),
+                        key -> keyPattern.getUserIdentifier(key),
                         key -> getInt(key, 0)
                 ));
     }

src/main/java/com/jiwon/mylog/global/redis/key/RedisKey.java

@@ -30,6 +30,12 @@ public String getPrefix() {
         return prefix;
     }
 
+    public Long getUserIdentifier(String redisKey) {
+        int index = redisKey.lastIndexOf(':');
+        String keyString = redisKey.substring(index + 1);
+        return Long.parseLong(keyString);
+    }
+
     public Duration getTtl() {
         return ttl;
     }

src/main/java/com/jiwon/mylog/global/schedular/PostViewScheduler.java

@@ -19,15 +19,18 @@ public class PostViewScheduler {
     private final PostRepository postRepository;
     private final RedisUtil redisUtil;
 
-    @Scheduled(fixedRate = 10 * 60 * 1000L)
+    @Scheduled(fixedRate = 30 * 60 * 1000L)
     @Transactional
     public void syncPostViewToDB() {
-        Map<Long, Integer> postCounts = redisUtil.getAllPostView(RedisKey.VIEW_COUNT_KEY.getPrefix());
+        Map<Long, Integer> postCounts = redisUtil.getAllPostView(RedisKey.VIEW_COUNT_KEY);
+        log.info("PostViewScheduler 시작: {}개", postCounts.size());
+
         postCounts.forEach((postId, view) -> {
             try {
+                log.debug("postId: {}, view: {}", postId, view);
                 postRepository.updatePostView(postId, view);
             } catch (Exception e) {
-                log.error("조회수 동기화 실패, 게시글 {}: {}", postId, e.getMessage());
+                log.error("조회수 동기화 실패, postId={}: {}", postId, e.getMessage());
             }
         });
     }