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how about a ZFS snapshot of a million files, is that any different than a single file database?

Unless you need filesystem features, object stores are probably a better target.

Or possibly a document based data store.

The monolithic persistence layer is an anti pattern unless you have specific reasons to support it.

ZFS is quite nice as filesystems go but it is still a filesystem.

As the saying goes: If the only tool you have is a hammer, it is tempting to treat everything as if it were a nail.