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UUID v4 vs UUID v7: Performance, Security and Real Benchmarks at 100M

TL;DR — UUID v7 trie 13× plus vite que v4 en simulation B-tree (1M entrées), expose une empreinte mémoire identique, mais révèle son timestamp d'émission. UUID v4 reste le choix "zéro réflexion" pour les identifiants isolés. Le reste de cet article vous donnera les données pour décider. Introduction Les UUIDs sont omniprésents dans les systèmes modernes : clés primaires de bases de données, identifiants de sessions, tokens de traçabilité. Pourtant, le choix de la version impacte directement les performances en écriture et en lecture, la fragmentation des index, et — dans certains contextes — la confidentialité des données. UUID v4 (RFC 4122, 2005) est aujourd'hui la version par défaut de presque tous les ORM et frameworks. UUID v7 (RFC 9562, 2024) est son successeur moderne, conçu pour corriger son principal défaut : le désordre lexicographique. Dans cet article, nous allons mettre les deux en face avec des benchmarks réels sur des volumes de 100 000 à 10 millions d'UUIDs , analyser leur structure bit par bit, et vous donner une grille de décision claire. Structure interne : ce que contiennent ces 128 bits UUID v4 xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx Bits Contenu 0–47 Aléatoire 48–51 Version (0100 = 4) 52–63 Aléatoire 64–65 Variant (10) 66–127 Aléatoire 122 bits d'entropie pure. Aucune information temporelle. Chaque UUID est statistiquement indépendant des autres. UUID v7 019ed5c8-2a2f-7974-91f2-6ba1f313dcfa └──────────────┘ 48 bits = timestamp Unix en millisecondes Bits Contenu 0–47 Timestamp Unix (ms) 48–51 Version (0111 = 7) 52–63 Aléatoire (sub-ms ou compteur) 64–65 Variant (10) 66–127 Aléatoire 74 bits d'entropie + 48 bits de temps. Naturellement monotone : deux UUIDs générés dans la même milliseconde sont toujours distincts et ordonnés de façon cohérente. Lecture du timestamp (Python) : import uuid6 u = uuid6 . uuid7 () b = u . bytes ts_ms = int . from_bytes ( b [: 6 ], ' big ' ) # → 1781703125553 (ms depuis epoch Unix) Depuis la sortie de nos benchmarks : [00

2026-06-17 原文 →
AI 资讯

WSL UI, WSL Dashboard, and a "Counterfeit" Claim That Doesn't Survive the Timeline

There is now a second free WSL management tool out there called WSL Dashboard , published by a developer who goes by owu on GitHub. It is open source, it has more GitHub stars than WSL UI, and it is clearly the product of real effort. I have no problem with any of that. Competition is good for users, and WSL deserves more than one good GUI. What I do have a problem with is this notice, which appears both on wslui.com and in the WSL Dashboard README: "This software is not distributed through the Microsoft Store. Any application listed there under the same name is unauthorized and may be counterfeit. Please do not download it to avoid potential scams." WSL UI is on the Microsoft Store. It has been since January. So that notice is, in plain terms, telling people that the genuine, certified, earlier WSL tool is a counterfeit scam. It isn't. And the entire claim falls apart the moment you look at the dates — all of which are public, timestamped, and independently verifiable. What this post is, and what it isn't This is not a "my project is better than yours" post. I'm not going to pick apart WSL Dashboard's features or pretend it's a bad piece of software. It isn't. This is a correction of one specific, factual claim: that the version of WSL UI on the Microsoft Store is unauthorized or counterfeit. That claim is demonstrably false, and because it's aimed at a tool people trust, it's worth setting straight properly — with evidence, not adjectives. The timeline Every date below comes from a public record. I've linked the sources so you don't have to take my word for any of it. Date Event How to verify 2008-12-11 octasoft.co.uk registered. Octasoft Ltd has existed for well over a decade. Nominet WHOIS for octasoft.co.uk 2025-12-14 The octasoft-ltd/wsl-ui repository is created. GitHub API ( created_at ) 2026-01-10 WSL UI's first public release, v0.2.0. WSL UI releases 2026-01-13 WSL UI v0.14.0 is published to the Microsoft Store. The announcement post 2026-01-18 The owu/wsl-

2026-06-17 原文 →
AI 资讯

I've Been Trying to Build Something Online Since 2020. Still Not There. Looking for Advice.

In 2020, I discovered the idea that people could make money online by building things. Since then, I've tried almost everything. I started websites. I learned design. I learned marketing. I built digital products. I launched projects that nobody used. I launched projects that got almost no traffic. Every year I thought: "Maybe this is the year it finally works." But somehow I always ended up back at zero. The frustrating part is that I didn't quit. For 5 years I've been consistently learning new skills: Graphic design Website building Digital products Content marketing SEO Social media Yet I still haven't reached the point where I can say: "Yes, this business is working." Recently I spent weeks building a library of 500+ Notion templates. I launched it. The result? Almost nothing. No viral launch. No overnight success. Just another reminder that building is easier than distribution. That's the lesson that keeps hitting me: Building isn't my problem anymore. Getting attention is. I can create products. I can design landing pages. I can write content. But distribution still feels like a puzzle I'm trying to solve. So I'm asking developers, founders, and creators who are further ahead: If you were starting again today with no audience and no reputation, what would you focus on? Would you: Double down on content? Build more products? Focus entirely on one distribution channel? Spend more time networking? I'm genuinely curious because after 5 years of trying different things, I'm convinced the answer isn't "work harder." It's probably "work differently." I'd love to hear your advice.

2026-06-17 原文 →
AI 资讯

Building software with an amnesiac agent: notes on a resumable overnight build loop

I wanted to see how far an autonomous coding agent could get unattended. The constraint that makes this hard isn't code generation — it's that each session starts with zero memory of the last. So the design problem is state, not prompting. Setup A cron-scheduled task fires hourly, 11pm–7am (~8 runs). Each run is a fresh agent session. No shared context, no carryover. State lives entirely on disk: the working tree, the git history, and two files — BUILD_SPEC.md (the immutable goal/architecture) and PROGRESS.md (an append-only decision + status log). The run loop Every session does the same thing: Read BUILD_SPEC.md, then PROGRESS.md, then git log --oneline. Reconstruct "where are we" from the files themselves (the code is the source of truth, not the narrative). Do one unit of work. Commit. Append to PROGRESS.md: what changed, why (chosen X over Y because Z), and the exact next step. Commit granularity = checkpoint granularity. Worst case on an interrupted session is losing one unit, and the next run re-derives it. The "why" lines matter as much as the diffs — without them a later session re-litigates settled decisions. Guardrails The agent was allowed to build, test, and commit locally. It was explicitly not allowed to deploy, push to a remote, or touch secrets — those get written into PROGRESS.md as "needs human" items instead. This boundary is what makes unattended runs safe to leave alone. What came out A working full-stack monorepo: a pure TS scheduling engine (with property tests), multi-tenant auth, a Drizzle/Postgres schema, server-side re-validation, and publish/share/export flows. Across the runs it cleared its own stale git lock, and one session caught and fixed an off-by-one in a labeling layer that spanned five files. The takeaway The leverage wasn't the model writing code. It was designing a process where progress is durable across total context loss — externalize state, checkpoint constantly, log decisions not just actions, and fence off irreversible o

2026-06-16 原文 →
AI 资讯

Grok Build Agent Dashboard: Run 8 Parallel Coding Agents From One Screen

xAI shipped the Grok Build Agent Dashboard on June 15, 2026, and it changes how multi-session coding actually works. Eight parallel agents — four on Grok Code 1 Fast, four on Grok 4 Fast — all visible on one screen. Sessions sorted by state automatically. Sub-agents rolled up under the session that launched them. Reply to a blocked session without ever leaving the dashboard view. If you are already running Grok Build (launched June 5, 2026 in beta), this is a meaningful upgrade. If you are evaluating coding agents and parallel execution is part of your decision criteria, the Agent Dashboard is the most developed TUI for multi-session work in any terminal coding agent right now. Here is exactly what it does and when to use it. How to Open It Two ways in. From your shell: grok dashboard Or from inside any Grok Build session: /dashboard The keyboard shortcut Ctrl+ also opens the dashboard from any active session. Closing the dashboard does not close your sessions — they keep running. When you reopen it, every session is still there in whatever state it was in when you left. That last point matters. The dashboard is a view, not a session manager. Sessions have independent lifetimes. You can close the dashboard, switch to a different terminal, do other work, and come back to a batch of completed or paused sessions waiting for your attention. Session States and the Sorting Logic Every session in the dashboard shows one of three states: working , awaiting input , or idle . The dashboard sorts them automatically, with sessions waiting for your input at the top. Working sessions come next. Idle sessions sit at the bottom. The practical result: open the dashboard and the first thing you see is your blocker queue. Sessions that need you are at the top. Everything else is running or done. You do not have to mentally track what state each terminal is in — the sort does that for you. Selecting any row shows the session's latest output inline, without opening the full conversation

2026-06-16 原文 →
开发者

UI IP Toolkit - A standalone static visual catalog for CSS/JS components

UI IP Toolkit - A standalone static visual catalog for CSS/JS components I built UI IP Toolkit to solve my own workflow problem: I kept losing useful UI snippets (buttons, loaders, CTA blocks, glassmorphic cards, layout grids) across old projects and directories. Live site: https://ui-ip-toolkit.vercel.app/ GitHub Repository: https://github.com/ikerperez12/UI-IP-Toolkit-v4.0 Design Philosophy Zero dependencies: Raw HTML, CSS, and vanilla JS. No NPM packages, framework configurations, or build steps required. Copy-paste ready: Visual preview cards with one-click copy buttons for immediate use in any stack. Light/Dark mode: Clean design system focusing on micro-interactions, sleek gradients, and responsive layouts. Visual catalog: Catalog of gradients, buttons, fonts, loading states, hover treatments, glass surfaces, layout fragments, and UI patterns. How do you manage your personal code/CSS snippet collections? Hope this is useful to others!

2026-06-15 原文 →