Update ddl-auto

Author: geminiKim

storage/db-core/src/main/resources/db-core.yml

@@ -2,7 +2,7 @@ spring:
   jpa:
     open-in-view: false
     hibernate:
-      ddl-auto: none
+      ddl-auto: validate
     properties:
       hibernate.default_batch_fetch_size: 100