A deep dive into SpacetimeDB's TypeScript SDK and how to wire it into a Next.js 15 App Router application for live visitor tracking and realtime features.
3 min readCurrent systems
Active work,
live signals, and writing.
Featured builds, the latest ranked signal, and recent writing — all in one place.
Featured build
MAINFRAME
Open-source bash stdlib for AI agents. Signals systems-level engineering range. Shows open-source authorship.
Pure bash runtime · Agent working memory primitives
Latest ranked signal
OpenAI unveils Lockdown Mode to protect sensitive data from prompt injection attacks
Even with Lockdown Mode, ChatGPT could be still vulnerable to prompt injections, but the goal is to reduce the likelihood that sensitive data gets shared in the process.
TCAI · 3h ago · score 56
Publishing system
Building Realtime Apps with SpacetimeDB and Next.js 15
A deep dive into SpacetimeDB's TypeScript SDK and how to wire it into a Next.js 15 App Router application for live visitor tracking and realtime features.
3 min read · spacetimedb · next.js
Open-source ecosystems
Projects I support
Small but important signal: I contribute to and support AI-native developer tooling beyond my own products.
✦ Selected Work
Systems I've Built
Ranked signal feed
Full feed →TC AI· 3h ago↑ RISING
OpenAI unveils Lockdown Mode to protect sensitive data from prompt injection attacks
56
aitechLOB· 5h ago↑ RISING
Getting silly with C, part &((int*)-8)[3]
62
devsystemsHF· 5h ago↑ RISING
Five labs, five minds: building a multi-model finance drama on small models
64
airesearchTC AI· 6h ago↑ RISING
What to expect from WWDC 2026: Siri’s highly anticipated revamp and Apple Intelligence updates
56
aitechHN· 5h ago↑ RISING
Meta confirms 1000s of Instagram accounts were hacked by abusing its AI chatbot
36
⬆ 134aiHN· 6h ago↑ RISING
Pentagon raised threat of Israeli spying on U.S. to highest level, sources say
37
⬆ 280aisystems✦ /now
What I'm Doing
Right Now
Building
ACTIVE
PropertyJunk.com — junk removal SaaS platform
ACTIVE
TaxScout.app — commercial real estate tax optimization
WIP
MAINFRAME — open source bash stdlib expansion
WIP
toddwatts.dev — this site
Reading
01Attention Is All You Need (re-read)
02The Pragmatic Programmer — 2nd ed.
03Designing ML Systems — Chip Huyen
Watching
▶
Andrej Karpathy
Neural nets: Zero to Hero
▶
Lex Fridman
Sam Altman ep.
▶
ThePrimeagen
Rust streams
My Setup
EditorVS Code + Claude Code
AIClaude Sonnet 4.5, Pi
RuntimeBun 1.2
DeployVercel






