DEV Community • 2026-07-27 08:40

Permission-Aware RAG: Enforcing Document ACLs at Retrieval Time

Most RAG demos have a security model of "none." Documents go into one shared index; anyone who can ask a question can surface content from any document. In a compliance or financial domain, that's not a rough edge — it's a disqualifier. When I built Atlas, an enterprise copilot for a compliance domain, the first architectural decision was where access control lives. There are three options, and t...

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DEV Community • 2026-07-27 08:40

The Cloudflare Worker That Ran Perfectly and Still Failed Twice

This is a submission for DEV's Summer Bug Smash: Clear the Lineup powered by Sentry. Project Overview workers-monitor is a Cloudflare Worker that watches a small fleet of my own Workers. Hourly cron, pulls fleet metrics from Cloudflare's GraphQL Analytics API, runs a deterministic threshold gate, and only calls Claude Haiku to judge signal-vs-noise if the gate trips. If Haiku confirms ...

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Lobsters • 2026-07-27 08:37

Make Reviews Possible Again With This One Simple Trick

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Hacker News • 2026-07-27 08:36

Show HN: We built an MCP server for document generation

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DEV Community • 2026-07-27 08:35

Your BigQuery bill is a query-shape problem. We cut one 72% in three weeks.

BigQuery doesn't charge you for having data. It charges you for touching it. On-demand pricing bills per byte scanned, which means your bill isn't a data-size problem or a traffic problem. It's a query-shape problem, and query shape is fixable in an afternoon per table. A recent client was a textbook case. Dashboards running SELECT * over an unpartitioned events table, so every refresh scanned th...

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DEV Community • 2026-07-27 08:35

Your Claude Code skill's description is being cut: the 1,536-char cap and the shared listing budget

You wrote a skill. The description is clear. You ask for exactly the thing it does, and Claude reaches for something else. Before you rewrite the description a fourth time, check whether Claude ever saw the whole thing. Two separate limits trim skill metadata before the model reads it, and both are silent. The two limits are not the same limit Claude Code loads a listing of your skill...

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Why Your Playwright Tests Are Lying to You (And How to Actually Fix Flakiness)
DEV Community • 2026-07-27 08:31

Why Your Playwright Tests Are Lying to You (And How to Actually Fix Flakiness)

Flaky tests aren't random — they're deterministic bugs you haven't found the trigger for yet. This post covers the 8 real root causes, how to reproduce flakiness on demand instead of guessing, and the fixes that actually stick. Code examples throughout. You've been there. A test fails in CI. You re-run it. It passes. You shrug, blame "the network," and move on — until it fails again three da...

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Flavio Copes • 2026-07-27 08:30

I launched migratingto.dev: exact playbooks for moving between platforms

I launched migratingto.dev, a library of versioned migration playbooks with loss matrices, timelines, rollback plans, and verification checks.

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Hacker News: Front Page • 2026-07-27 08:27

Modern email can be built from borrowed parts

Article URL: https://en.andros.dev/blog/d7ed8b07/modern-email-can-be-built-from-borrowed-parts/ Comments URL: https://news.ycombinator.com/item?id=49066639 Points: 3 # Comments: 0

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DEV Community • 2026-07-27 08:21

CVE-2026-50458: Patching Use-After-Free Vulnerability in bfs.sys Windows Kernel Minifilter Driver

Introduction The recently patched CVE-2026-50458 vulnerability in the Windows Brokering File System (bfs.sys) driver exemplifies the critical risks associated with Use-After-Free (UAF) flaws in kernel components. Addressed in the latest Patch Tuesday, this vulnerability underscores the imperative for proactive security measures to preempt exploitation. Through a detailed technical analy...

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🧠 Architect a Personalized Multi-Agent System with Long-Term Memory for Real Estate Tokenization
DEV Community • 2026-07-27 08:20

🧠 Architect a Personalized Multi-Agent System with Long-Term Memory for Real Estate Tokenization

🧠 Architect a Personalized Multi-Agent System with Long-Term Memory Inspired by Google's approach to multi-agent systems with long-term memory The Vision 🌟 Imagine a system where AI agents work together to manage your real estate tokenization platform, each with their own specialized role and the ability to remember and learn from past interactions. This is exactly w...

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Hacker News: Front Page • 2026-07-27 08:20

Elevated errors on Claude Opus 5

Article URL: https://status.claude.com/incidents/lhqp09kxq7pb Comments URL: https://news.ycombinator.com/item?id=49066591 Points: 4 # Comments: 1

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DEV Community • 2026-07-27 08:20

API Testing with Python and pytest: Writing Real Tests Against a Live Mock API

Every time I want to teach someone API testing, I hit the same wall: there's nothing decent to test against. Public APIs are either read-only (so you never touch a POST), rate-limited into uselessness, or they need a signup flow and a key in a .env file before anyone writes a single assertion. JSONPlaceholder is the usual fallback, but it fakes its writes — you POST something, get a 201, and the ...

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Hacker News • 2026-07-27 08:18

Show HN: adCasa OS – AI marketing workspace built with Bayesian attribution

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The AI Resistance: Engineers vs The Machines
HackerNoon • 2026-07-27 08:15

The AI Resistance: Engineers vs The Machines

Explore the debate around GitHub Copilot, AI-assisted development, trust, productivity, and the future of software engineering.

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DEV Community • 2026-07-27 08:14

Batch Geocoding at Scale with France's Free BAN API: Thresholds, Chunks, and Zero Lock Contention

We needed GPS coordinates for 14.4 million French business establishments to power radius-based searches. Here's the pipeline we built — free, no third-party services, and designed to run daily alongside a live application without ever locking the database. The Starting Point The French SIRENE registry lists every active business establishment in the country: 14,387,175 of them as of J...

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DEV Community • 2026-07-27 08:14

Stop Fighting Referential Instability: Solving React Re-Renders with useDeepMemo

We've all been there: you pass an object literal or an array as a dependency to useMemo or useEffect, only to realize it triggers on every single render. Because JavaScript compares objects by reference rather than structure, {} never equals {}. In the latest release of react-hook-lab (v1.6.0), we are introducing a highly requested utility to put an end to referential instability: useDeepMemo, a...

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Lobsters • 2026-07-27 08:12

DOOM running on a regex engine

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DEV Community • 2026-07-27 08:09

5 Lightweight Self-Hosted Error Trackers That Actually Replace Sentry on Your Own Hardware

TL;DR: The free tier cap isn't an inconvenience — it's a trap. A mid-traffic side project running into a bad deploy can exhaust Sentry's hosted event quota within the first hour of the incident. 📖 Reading time: ~16 min What's in this article Why Sentry's Hosted Version Becomes a Problem at Scale The 5 Tools: Quick Comparison Before the Detail GlitchTip: The Closest Drop-In for Sen...

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DEV Community • 2026-07-27 08:09

Building a Modern JavaScript Date Picker: Lessons I Learned Along the Way

Every developer eventually says: "How hard can it be to build a date picker?" A few weeks later, you realize the answer is: Much harder than it looks. A few months ago, I started building my own JavaScript date picker called RollDate. The goal wasn't to compete with every existing library, but to create something lightweight, dependency-free, and enjoyable to use. Why another date picker? Ther...

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