Fix concurrency issue by isolating putBase in a separate transaction

The putBase operation is now executed in an isolated transaction to ensure it is retryable without impacting the parent transaction. This prevents concurrency issues that were previously causing conflicts in the parent transaction during import.

webapp/src/main/java/com/box/l10n/mojito/service/blobstorage/database/DatabaseBlobStorage.java

@@ -11,6 +11,8 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.data.domain.PageRequest;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Implementation that use the database to store the blobs.
@@ -60,6 +62,7 @@ public void put(String name, byte[] content, Retention retention) {
  });
  }
 
+ @Transactional(propagation = Propagation.REQUIRES_NEW)
  void putBase(String name, byte[] content, Retention retention) {
  MBlob mBlob =
  mBlobRepository