In Q3 2026, our 12-person IoT telemetry team hit a wall: PostgreSQL 17’s write throughput peaked at 42k writes/sec for our 10TB time-series dataset, with p99 write latency spiking to 1.8s during peak hours. After a 6-week migration to Apache Cassandra 5.0, we increased write throughput to 63k writes/sec (50% faster than Postgres), slashed p99 latency to 420ms, and cut our RDS storage costs by 37% — all while maintaining 99.99% write durability. Here’s how we did it, the benchmarks that backed the decision, and the tradeoffs we didn’t see coming. 📡 Hacker News Top Stories Right Now Uber Torches 2026 AI Budget on Claude Code in Four Months (45 points) Ask HN: Who is hiring? (May 2026) (90 points) whohas – Command-line utility for cross-distro, cross-repository package search (43 points) Ask HN: Who wants to be hired?…