fix: 직렬화 저장 오류 해결

src/main/java/com/j9/bestmoments/converter/StringListConverter.java

@@ -0,0 +1,23 @@
+package com.j9.bestmoments.converter;
+
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Converter;
+import java.util.Arrays;
+import java.util.List;
+
+@Converter
+public class StringListConverter implements AttributeConverter<List<String>, String> {
+
+    private static final String SEPARATOR = ",";
+
+    @Override
+    public String convertToDatabaseColumn(List<String> attribute) {
+        return String.join(SEPARATOR, attribute);
+    }
+
+    @Override
+    public List<String> convertToEntityAttribute(String dbData) {
+        return Arrays.asList(dbData.split(SEPARATOR));
+    }
+
+}

src/main/java/com/j9/bestmoments/domain/Video.java

@@ -1,5 +1,7 @@
 package com.j9.bestmoments.domain;
 
+import com.j9.bestmoments.converter.StringListConverter;
+import jakarta.persistence.Convert;
 import jakarta.persistence.ElementCollection;
 import jakarta.persistence.Entity;
 import jakarta.persistence.EntityListeners;
@@ -35,6 +37,7 @@ public class Video {
     private String videoUrl;
     private String thumbnailUrl;
     @Lob
+    @Convert(converter = StringListConverter.class)
     private List<String> encodedVideoUrls;
 
     private String title;