Mathias Lafeldt
@mathias.blog
Indie product engineer obsessed with dev tools & performance.
Maintainer of duckdb-rs & duckdb-go. Zig-pilled. ⚡️
🔗 mathias.blog
Maintainer of duckdb-rs & duckdb-go. Zig-pilled. ⚡️
🔗 mathias.blog
Even the smart robots are also confused by Cloudflare vs CloudFront
November 19, 2025 at 7:11 PM
Even the smart robots are also confused by Cloudflare vs CloudFront
When your website and monitoring provider are both deployed to Cloudflare 🙈
November 19, 2025 at 10:59 AM
When your website and monitoring provider are both deployed to Cloudflare 🙈
At long last, I figured out how to capture exceptions inside waitUntil with Sentry \o/
November 19, 2025 at 10:06 AM
At long last, I figured out how to capture exceptions inside waitUntil with Sentry \o/
Something I'm exploring...
Building DuckDB itself with Zig (~400 lines build.zig)
A bit surprised that it can load C++ core extensions just fine. Zig uses clang, official builds use clang, macOS libc++ is the same → ABI compatible? 🤔
Building DuckDB itself with Zig (~400 lines build.zig)
A bit surprised that it can load C++ core extensions just fine. Zig uses clang, official builds use clang, macOS libc++ is the same → ABI compatible? 🤔
November 17, 2025 at 4:47 PM
Something I'm exploring...
Building DuckDB itself with Zig (~400 lines build.zig)
A bit surprised that it can load C++ core extensions just fine. Zig uses clang, official builds use clang, macOS libc++ is the same → ABI compatible? 🤔
Building DuckDB itself with Zig (~400 lines build.zig)
A bit surprised that it can load C++ core extensions just fine. Zig uses clang, official builds use clang, macOS libc++ is the same → ABI compatible? 🤔
All right, all right. I will give it a shot.
November 4, 2025 at 5:22 PM
All right, all right. I will give it a shot.
I've updated my Worklog Analyzer tool to also display the max number of hours/days per month for a given client, which helps me stay on target. 🎯
mathias.blog/tools/worklog
mathias.blog/tools/worklog
November 1, 2025 at 11:09 AM
I've updated my Worklog Analyzer tool to also display the max number of hours/days per month for a given client, which helps me stay on target. 🎯
mathias.blog/tools/worklog
mathias.blog/tools/worklog
duckdb-rs bugfix of the week
October 29, 2025 at 12:57 PM
duckdb-rs bugfix of the week
Would've have loved to go ⚡️
October 25, 2025 at 3:39 PM
Would've have loved to go ⚡️
October 24, 2025 at 12:04 PM
Quick reference for DuckDB C API versions 🔢
October 23, 2025 at 7:34 AM
Quick reference for DuckDB C API versions 🔢
It took a little research to figure this out, but here's what you need to do to get Claude to automatically format code after changes. In my case, format-file calls prettier, ruff, zig fmt, etc., depending on the file extension.
October 22, 2025 at 8:33 AM
It took a little research to figure this out, but here's what you need to do to get Claude to automatically format code after changes. In my case, format-file calls prettier, ruff, zig fmt, etc., depending on the file extension.
Migration to duckdb-go ✅
October 20, 2025 at 6:19 PM
Migration to duckdb-go ✅
Or I can just let it compile on change with zig build --watch
October 14, 2025 at 10:08 AM
Or I can just let it compile on change with zig build --watch
Now that zig build test --watch also works on macOS, I can use it to automatically run unit and SQL logic tests whenever I change a DuckDB extension, across multiple DuckDB versions. 😍
October 14, 2025 at 10:03 AM
Now that zig build test --watch also works on macOS, I can use it to automatically run unit and SQL logic tests whenever I change a DuckDB extension, across multiple DuckDB versions. 😍
I was about to name-drop "Preact fork", but even that seems to be old news.
remix.run/blog/wake-up...
remix.run/blog/wake-up...
October 13, 2025 at 12:07 PM
I was about to name-drop "Preact fork", but even that seems to be old news.
remix.run/blog/wake-up...
remix.run/blog/wake-up...
You can deliberately trigger Claude Code to use sub-agents
October 13, 2025 at 7:49 AM
You can deliberately trigger Claude Code to use sub-agents
October 12, 2025 at 6:43 PM
Starting the week strong in DuckDB land, bouncing between Go, Rust, C++, and Zig before lunch 😎
October 6, 2025 at 10:41 AM
Starting the week strong in DuckDB land, bouncing between Go, Rust, C++, and Zig before lunch 😎
I've become a fan of bionic reading, thanks to reederapp.com/classic/
It takes some getting used to, but the reading experience *feels* better.
It takes some getting used to, but the reading experience *feels* better.
October 4, 2025 at 3:36 PM
I've become a fan of bionic reading, thanks to reederapp.com/classic/
It takes some getting used to, but the reading experience *feels* better.
It takes some getting used to, but the reading experience *feels* better.
I like to keep track of my freelance work in a simple Markdown document for each client. While simple, calculating hours at the end of a month was always a bit tedious. So I decided to vibe-code a little tool that does the work for me:
mathias.blog/tools/worklog
mathias.blog/tools/worklog
October 2, 2025 at 7:59 AM
I like to keep track of my freelance work in a simple Markdown document for each client. While simple, calculating hours at the end of a month was always a bit tedious. So I decided to vibe-code a little tool that does the work for me:
mathias.blog/tools/worklog
mathias.blog/tools/worklog
Never noticed that you can launch Claude Code in its own tab using this icon in the upper right corner of VS Code. Unfortunately, YOLO mode is currently broken (github.com/anthropics/c...), so it's not an option for me anyway. 😎
October 1, 2025 at 11:20 AM
Never noticed that you can launch Claude Code in its own tab using this icon in the upper right corner of VS Code. Unfortunately, YOLO mode is currently broken (github.com/anthropics/c...), so it's not an option for me anyway. 😎
September 29, 2025 at 1:38 PM