Harden Event-driven systems: what I learned (107)

I used this as a focused experiment, and I wrote it down while it was still fresh.

Why I touched it

The result came from removing an assumption, not adding one more layer.

I kept everything practical by using a short loop around Event-driven systems.

Implementation notes

I started with a narrow goal: keep the same behavior, reduce one risk, and keep rollback trivial. I moved from vague ideas to explicit rules before touching production paths.

Validation checklist

• Confirm ownership and blast radius
• Add one failing test
• Verify a rollback path
• Remove temporary debug logic

Snippet

set -euo pipefail

node --version
npm ci
npm run lint
npm run test

I also ran this while working from a bike trip for one IRL pass.

What I kept

• This event-driven systems setup now has a measurable made failures obvious path.
• I keep the same format for every future run.
• If it can be explained in one checklist, it usually scales better.