order checkout — v2 redesign
scratch board · last touched today
do we really need 2 queues here?
kafka + sqs is overkill
— ren · 2h ago
postgres won't survive 10k QPS
on flash sales — need read replicas
— maya · 4h ago
payment retries should be
idempotent ALWAYS
(learned this the hard way)
— devi · yesterday
what if the gateway falls over?
circuit breaker → static fallback?
— jules · 3h ago
redis is a cache, not a db.
do not put cart state here.
— maya · 1h ago