IoT fleets now push 12 trillion sensor writes daily, but 68% of teams overspend on NoSQL throughput by picking the wrong engine. We benchmarked MongoDB 8.0, DynamoDB 2026, and Cassandra 5.0 across 1.2M writes/sec workloads to find the winner. 📡 Hacker News Top Stories Right Now DOOM running in ChatGPT and Claude (35 points) Localsend: An open-source cross-platform alternative to AirDrop (642 points) Interview with OpenAI and AWS CEOs about Bedrock Managed Agents (12 points) Microsoft VibeVoice: Open-Source Frontier Voice AI (272 points) Claude.ai unavailable and elevated errors on the API (151 points) Key Insights MongoDB 8.0 delivers 142k writes/sec per vCPU on 16-core AWS i4i.4xlarge nodes, 22% faster than Cassandra 5.0 for time-series IoT payloads. DynamoDB 2026 on-demand mode sustains 1.2M writes/sec with 0.8ms p99 latency for 1KB payloads, but costs $0.012 per 10k writes vs $0.004 for self-hosted Cassandra.…