Databases

2 articles

Web Engineering • Aug 16, 2026

Zero downtime database migration: 5 flags and a 17x P90 gap

A zero downtime database migration is five feature-flagged phases, not a cutover. P95 said 4x slower, P90 said 17x, and the comparison code took a region down.

12 min read

AI Coding Agents & DX • Aug 13, 2026

Build your research spike as running code: 8 blockers a doc missed

A research spike should ship as running code, not a design doc. alchemy-utils surfaced 8 engine blockers a doc would miss, and priced the fix at 3-5 weeks.

10 min read