if only metadata could be queried without processing a csv output file first, imagine storing thumbnails in there even! copied objects had actual events, not something you have to dig cloudtrail for, you could get last update time from a bucket to make caching easier
whoops. I was wrong! you can store base64 encoded metadata in the object then run a HEAD request to get it, but its limited to 2kb.
also, you ~can~ query the metadata, but its latency is more suited to batch processing and not lambdas
