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Behind the Scenes: Block 450 JVM Repositories Into Monorepo to Reduce Dependency Drift

Block, Inc. describes migrating ~450 JVM repositories into a monorepo across Cash App and Square engineering to reduce dependency drift and coordination overhead. The system supports ~8,800 weekly builds with ~10 min p90 CI time. The approach improves cross-service changes, build visibility, and developer experience through dependency graph–based builds, selective CI, and custom IDE tooling. By Leela Kumili

2026-06-19 原文 →
AI 资讯

Exploring 5-Minute Prediction Markets: Data, Speed, and Building an Edge

The “5-minute market” concept is gaining attention because of how fast new prediction rounds appear and how quickly volume builds up. Each cycle is short, which creates both opportunity and risk for anyone trying to analyze or trade it. In this article, I’ll break down how I’ve been approaching this space from a data perspective, how I’m thinking about building an edge, and the tools I’ve been experimenting with. What is the 5-minute market? A 5-minute market is a fast-cycle prediction or trading window where outcomes resolve quickly and new markets appear frequently. Compared to longer timeframes (like 15-minute markets), these shorter cycles: Generate more trading opportunities per hour Require faster data collection and processing Make latency and execution extremely important Increase noise in price action Because of this, traditional slow analysis often doesn’t work well here. Data collection approach My current setup focuses on continuously pulling market data in real time. The idea is simple: Connect to a market data source (I’m using a Gamma API as part of the pipeline) Stream or request live market updates Store order book + price movement data Aggregate it into 5-minute windows for analysis The goal is to build a dataset that can later be used for backtesting and feature extraction. Right now, I’m mainly focusing on a single asset (PPC) to keep things simple while testing the pipeline. Where the potential edge might come from The key question is: can we predict short 5-minute movements better than random chance? Some areas I’m exploring: 1. Order book behavior Tracking: Liquidity changes Bid/ask imbalances Sudden volume spikes 2. Session-based behavior Some traders observe patterns during different market sessions: Asian session behavior London session volatility Overlap periods These may or may not hold in 5-minute markets, but they’re worth testing. 3. Micro momentum patterns Since markets reset frequently, short momentum bursts might matter more than lo

2026-06-19 原文 →
AI 资讯

What Does the Windows REFRESH button really do?

Hello, I'm Maneshwar. I'm building git-lrc, a Micro AI code reviewer that runs on every commit. It is free and source-available on Github. Star git-lrc to help devs discover the project. Do give it a try and share your feedback. I boot up my machine. The desktop loads. And before I open my editor, before I check Slack, before I do a single productive thing, I right-click an empty patch of desktop and hit Refresh . Then I do it again. And again. I am a person who can explain event loops and reason about cache invalidation, and yet here I am, mashing F5 on a static wallpaper like it owes me money. If you've never done this, congratulations, you're better than me. If you have ... welcome. You're among friends. First, let's kill the myth There's a folk belief that refreshing the desktop is a tiny act of system maintenance. A little spring cleaning. A gift to your hardworking CPU. It is not. Manually refreshing your desktop does not : free up RAM reduce CPU load clear some mysterious cache make your PC faster in any way, shape, or form All it does is tell Windows Explorer to redraw the current view . That's it. That's the whole feature. What's actually happening under the hood Here's the part that's actually interesting (we're devs, we live for the "actually"). Windows doesn't repaint your entire screen on every frame, that would be wildly wasteful. Instead it leans on a composition engine that, with help from your GPU when one's available, only redraws the regions that changed since the last frame. Already drawn elements get cached and reused. Icons, the taskbar, your wallpaper they're all mostly static, so mostly left alone. When something genuinely changes (you save a file, delete a folder, plug in a drive), the OS detects it and tells the composition engine: "hey, this little rectangle changed, repaint just that." The desktop refreshes itself, automatically, all day long, without you ever touching anything. So the manual Refresh button is really just a manual overrid

2026-06-19 原文 →
AI 资讯

Article: Designing Continuous Authorization for Sensitive Cloud Systems

Most cloud systems make one authorization decision at login. Everything after runs on trust established at authentication time. For systems handling regulated data, that gap is where breaches happen. This article presents a continuous authorization architecture covering risk-tiered evaluation, behavioral baselines, privacy-preserving audit trails, and a phased and incremental rollout. By Venkata Nedunoori

2026-06-19 原文 →
AI 资讯

Day 25 of 100 Days of ClickHouse: Mastering the ClickHouse HTTP API

ClickHouse HTTP API: A Complete Beginner's Guide Introduction When most people think about interacting with a database, they usually imagine connecting through a database client or application. However, ClickHouse also provides a simple and powerful HTTP API that allows you to query and manage your database using standard HTTP requests. The ClickHouse HTTP API provides a universal interface for communicating with your ClickHouse server. Since almost every programming language and automation tool supports HTTP, it becomes an excellent choice for integrations, monitoring, scripting, and lightweight applications. In this guide, you'll learn what the ClickHouse HTTP API is, why it's useful, and how to perform common database operations using simple HTTP requests. What Is the ClickHouse HTTP API? The ClickHouse HTTP API is a built-in interface that enables clients to communicate with a ClickHouse server using the HTTP protocol. Instead of connecting through the native TCP protocol, you simply send HTTP requests and receive responses in formats such as JSON, CSV, TSV, XML, or plain text. The HTTP interface is: Language agnostic Easy to integrate with web applications Firewall friendly Simple to test using tools like cURL, Postman, or a web browser Because of its simplicity, the HTTP API is widely used for automation, dashboards, data pipelines, and monitoring systems. Why Use the HTTP API? The ClickHouse HTTP API offers several advantages: No dedicated database driver is required. Works with virtually every programming language. Easy integration with REST-based applications. Supports multiple output formats. Ideal for automation and scripting. Perfect for cloud-native applications and microservices. Common Operations Using the HTTP API, you can: Execute SQL queries Insert data Create and modify tables Retrieve query results Export data in different formats Automate database operations Authentication Options ClickHouse supports multiple authentication methods when using th

2026-06-19 原文 →
AI 资讯

How to Build a Multi-Step Agent Stress Test: Adversity Sandboxes and Oracle Checks

Building a prototype of an AI agent is fun. Building a production-ready agent is a nightmare. In a perfect world, your agent always gets the perfect context, the API never fails, and the model never gets "lazy." But in the real world, transient errors are a constant, and models love to take shortcuts. If you aren't testing your agent against the messy reality of production, you’re setting yourself up for failure. This is where our Agent Profiler comes in. We’ve designed it to be an "adversity sandbox." It doesn’t just ask your agent a question; it challenges it. We inject transient runtime errors, introduce "lazy-agent traps" that force the model to stay focused, and validate structural AST matches to ensure the agent is actually outputting what it claims to output. It’s an active testing loop designed to stress-test your agent’s self-recovery mechanics. If your agent can’t handle a little chaos in the test suite, it certainly won’t survive your users.

2026-06-19 原文 →
开发者

Startup 001

Every startup idea looks perfect... until you start building. The first version of PixoraCloud looked amazing on paper. Then reality hit. We discovered: Some features weren't necessary Some APIs were too complicated Some ideas solved our problem, not the user's problem So we changed them. A lot. That's where we are today. Not chasing perfection. Chasing simplicity. Building in public means admitting your first idea isn't always your best one. What's one thing you've completely changed after starting a project?

2026-06-19 原文 →