message: Add missing serialize
diff: @@ -119,6 +119,7 @@ SingleFileBlockManager::SingleFileBlockManager(FileSystem &fs, string path, bool
  h2.meta_block = INVALID_BLOCK;
  h2.free_list = INVALID_BLOCK;
  h2.block_count = 0;
  + SerializeHeaderStructure<DatabaseHeader>(h2, header_buffer.buffer);
  header_buffer.Write(*handle, Storage::FILE_HEADER_SIZE * 2);
  // ensure that writing to disk is completed before returning
  handle->Sync();
  