Reliability · Jieun

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Reliability — Articles

Reliability 2026-11-02

Rehearsing an NCP Account Migration: What I Verified Without Disrupting Production

I tested restoration, application behavior, and worker isolation with production data before migrating NCP accounts. The rehearsal exposed extension schema, connection target, and leftover Redis key issues, while the actual cutover verified matching data and about 13 minutes of user impact.
Reliability 2026-11-02

NCP Account Migration: Why I Chose a Short Maintenance Window Over Zero Downtime

I compared three ways to migrate PostgreSQL and Redis between NCP accounts. Data size and operating conditions favored a short pause in writes and dump-and-restore, with the resumption of writes defining the cutover boundary.
Reliability 2026-08-25

The Domain Was Purchased but Would Not Load — Automating Connections Around DNS Delays

Separating immediate setup from work that waits for DNS, with connection checks and registration retries
Reliability 2026-07-20

Taking Caddy Out of the Deploy Path — the Structural Problem Was Touching a SPOF Automatically

Removing 60–100s outages, then the last 5 seconds
Reliability 2026-05-11

[Messenger Load-Testing, Part 2] There Was a Deadlock Hiding in AI-Generated Code — How We Replaced `unreadCount` with `lastReadAt`

42.8% errors in 9 minutes, caused by one updateMany
Reliability 2026-03-29

Why You Should Never Use KeyDB as a Pub/Sub Broker for Centrifugo

Five years of hang issues behind a perfect-looking active-replica
Reliability 2026-03-26

Building a Crash-Resilient, End-to-End Meeting Recording Pipeline in the Browser

Surviving a 300MB heap and tab crashes with 5-minute savepoints