Not quite. The data structures for the "database" part are more complex than a single json structure. Each update to the database is an "individual json" which

Not quite. The data structures for the "database" part are more complex than a single json structure. Each update to the database is an "individual json" which get linked together using an append-only log CRDT (https://github.com/orbitdb/ipfs-log https://github.com/orbitdb/ipfs-log) and you'd essentially serve that log. So instead of "one big json", it's "many small jsons" and the state (view) of the database gets calculated from those small jsons.