Build it: Why Caches Exist
An interactive sandbox where you drag real components together, connect them, and run a live traffic simulation to see where the design breaks.
Challenge: The client sends <strong>100 r/s</strong> to a server, and every request hits the database. The database can only handle 30 r/s. It is melting. Add a <strong>cache</strong> between the server and the database so most reads never reach the DB.