ALTER TABLE file_files
  ADD COLUMN thumbnail_mime_type VARCHAR(255) NULL AFTER etag,
  ADD COLUMN thumbnail_size_bytes BIGINT UNSIGNED NULL AFTER thumbnail_mime_type,
  ADD COLUMN thumbnail_bucket VARCHAR(128) NULL AFTER thumbnail_size_bytes,
  ADD COLUMN thumbnail_object_key VARCHAR(512) NULL AFTER thumbnail_bucket,
  ADD COLUMN thumbnail_object_version VARCHAR(128) NULL AFTER thumbnail_object_key,
  ADD COLUMN thumbnail_etag VARCHAR(128) NULL AFTER thumbnail_object_version,
  ADD UNIQUE KEY uq_file_files_thumbnail_object_key (thumbnail_object_key);