This is a real, unedited run of System Design Prompt Pack — no mockups, no cherry-picking. It's the store's whole promise: see the tool do the job before you pay for it.
demo · System Design Prompt Pack · 2026-09-01
Prompt: "We're about to commit to a single-region Postgres primary for a service expecting 50k daily users. Pressure-test this before we build it."
Result: Three failure modes surfaced — no automatic failover on region outage (single point of failure), connection pool exhaustion above ~2k concurrent writers without pgbouncer, and no plan for read-replica lag under reporting load. Each comes with the concrete fix and roughly what it costs to add now versus retrofit later.