2026 Serverless Postgres & Edge DB Pricing, Compute-Hour & Egress Trap Dataset + Cloud Bill CLI (Supabase, Neon, D1, Turso, Convex)

Engineering dataset (CSV + JSON) and Node.js CLI Cloud Bill Simulator comparing Supabase Pro, Neon (Launch $0.106/CU-hr vs Scale $0.222/CU-hr), Cloudflare D1 ($0 egress, $0 idle compute), Turso, Convex ($0.20-$0.30/GB egress), and Upstash. Models how background polling jobs prevent scale-to-zero and calculates exact monthly costs across compute hours, row reads/writes, and bandwidth egress.