Ask HN: Where's our web app database?

Why do we have generic database systems from 20 years ago still knocking around? With their standard types that can be loosely shoe-horned into what we need? Where is the ideal DBMS for web applications that understands email addresses and URLs natively? That handles versioning and partitioning out of the box? That's realtime, able to speak directly to a fleet of connected clients, not awaiting a proxy server-side programming language?