Foursquare co-founder says the company was acquired a month ago in a deal resulting in a $0 payout for equity holders, and faults leadership installed in 2021 (Dennis Crowley/Teendrama Snippets)

How We Built an Atomic, Sharded Incremental Cache with 57ms Rebuild Times

When building a local-first repository intelligence engine, speed is everything. A cold build on a 100k-file benchmark can take 45 to 55 seconds.

• TokenCap built atomic sharded incremental cache in src/incremental/cacheManager.js
• Cache uses content-based SHA-256 checksums for integrity verification
• Scoped invalidation enables 57ms rebuild time for single file edits

2h ago ·dev.to

Why my GETs worked but every POST got a 403: a CORS bug behind nginx in Docker

I'm a CS student building a tutoring management system: a Spring Boot REST API, a React frontend and PostgreSQL. While preparing the v1.2 release, I added a Docker Compose setup so anyone could run…

• Student developed tutoring management system with Spring Boot, React, PostgreSQL.
• CORS bug behind nginx in Docker caused 403 errors on POST/PATCH, not GET.
• Fix used $httphost in nginx config to preserve port number and same-origin recognition.

2h ago ·dev.to

Day 20: Persistent Storage in Kubernetes — Managing State, Weights and Vector Indices

Containers are ephemeral . When a Pod crashes or Kubernetes moves it, everything on its local disk is gone. For a web server that is fine.

2h ago ·dev.to

Check who your x402 agent is paying, before it signs

An x402 client pays whatever payTo the server puts in its 402 response. Budget caps answer "how much". Nothing in the default flow answers "to whom".

• x402-pay-guard tool checks payTo address against OFAC sanctions list
• Evaluates seller's history and recent wallet payments
• Integrates via npm package @factline/x402-pay-guard

2h ago ·dev.to