https://ewsirdev-portfolio.pages.dev/en/notes Short technical notes about decisions in my projects en Tue, 20 Oct 2026 00:00:00 +0000 https://ewsirdev-portfolio.pages.dev/en/notes/double-booking https://ewsirdev-portfolio.pages.dev/en/notes/double-booking Tue, 20 Oct 2026 00:00:00 +0000 How booking-slots protects against two clients booking the same time at once, and how that protection is tested. https://ewsirdev-portfolio.pages.dev/en/notes/lease-and-fencing https://ewsirdev-portfolio.pages.dev/en/notes/lease-and-fencing Tue, 20 Oct 2026 00:00:00 +0000 A worker can crash, stall, or wake up after its job was taken by someone else. How the lease and the lease token in job-queue deal with that on SQLite. https://ewsirdev-portfolio.pages.dev/en/notes/p95-nearest-rank https://ewsirdev-portfolio.pages.dev/en/notes/p95-nearest-rank Tue, 20 Oct 2026 00:00:00 +0000 How uptime-monitor computes p50/p95 latency and uptime, why the nearest-rank method was chosen, and where those numbers can mislead. https://ewsirdev-portfolio.pages.dev/en/notes/websocket-from-scratch https://ewsirdev-portfolio.pages.dev/en/notes/websocket-from-scratch Tue, 20 Oct 2026 00:00:00 +0000 Why realtime-rooms has its own RFC 6455 layer, which protocol violations it checks, and why a library is still the better choice for production.