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Sunday, 8 November 2026 Reading Room

Tech

๐Ÿ”‘ Reusing passkeys across environments โ€” browser edition

Originally published in Japanese on Zenn: passkeyใ‚’็’ฐๅขƒใ‚’่ถ…ใˆใฆไฝฟใ„ๅ›žใ—ใŸใ„ ใƒ–ใƒฉใ‚ฆใ‚ถ็ทจ Goal A passkey is a key that is bound to a specific site. A passkey created on wallet.example.com cannot be seen by pages on other domains or browser extensions. However, when building apps, you often want to do things like this: Derive the same secret using the same passkey in a web application on a different domain. Use anโ€ฆ

dev.to ยท

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How to keep lots of Excalidraw diagrams without losing them

I use Excalidraw for almost everything: system design notes, interview prep, sketches for blog posts. And every few weeks I see someone post that they lost months of drawings.

  • Save Excalidraw drawings as .excalidraw files manually through Excalidraw menu.
  • Export drawings as PNG or SVG files with Embed scene option on.
  • Use Excalidraw extension for VS Code or Obsidian plugin for versioning and backup.

ยทdev.to

A Tale of Two Lists: The Recently Lost and the Long Gone

Every subscription business keeps two lists of former customers without meaning to. One list is short and warm: people who left in the last few weeks.

  • Recent former customers form a short, warm list requiring specific reactivation efforts.
  • Long list of all former customers is cold, serving as a source for winback campaigns.
  • Separate treatment of reactivation and winback maximizes effectiveness and avoids confusion.

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Reviewing My nginx and Cloudflare Settings Cut Cloud Run Data Transfer Costs by 96%

In my previous post, [2026-11-03-1] , I reworked how I deploy to Cloud Run. This is a follow-up. As the title says, reviewing my nginx and Cloudflare settings cut my Cloud Run data transfer costs byโ€ฆ

  • Author reviewed Google Cloud bill to identify high data transfer costs.
  • Enabled gzip compression on nginx, reducing data transfer by 98%.
  • Set up Cloudflare caching rules for HTML and /index.xml files.

ยทdev.to

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