Right now we just have the "k" tags per content sections.

But that's not fine-grained enough for Replies (freaking kind-1s) and Indexed Text (30040).

nostr:naddr1qvzqqqrcvgpzp22rfmsktmgpk2rtan7zwu00zuzax5maq5dnsu5g3xxvqr2u3pd7qydhwumn8ghj7argv4nx7un9wd6zumn0wd68yvfwvdhk6tcpr3mhxue69uhhg6r9vd5hgctyv4kzumn0wd68yvfwvdhk6tcppemhxue69uhkummn9ekx7mp0qqrxu6ts943kxwstwsx