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RE: Concept: the Steem Ledger Index Protocol (SLIP)
Database indexes are maintained in app-specific decentralized clients.
You could probably use a post on the chain to store something like a JSON, XML, or other string-friendly representation of a data structure, and edit it whenever there's an update. That way consumers of the data could just use chain-level APIs rather than having to interface with the decentralized clients.
That would be amazing to have both data and indices on the blockchain. Not sure about size constraints or scaling, but it should work for some purposes, at least.
Maybe the index could even be stored in a profile's
json_metadatato avoid publishing it in any feeds. I can't find it right now, but I think I remember seeing a post by one of the Steem OGs pointing that there's a lot of untapped potential there.