Five Python Checks to Validate a Backtest Before Live Deployment

A software developer has outlined five critical checks to verify the integrity of trading strategy backtests before deploying them with real capital. The checks address common failure points including data leakage, where future information inadvertently influences historical signals, and improper train-test splitting that ignores time dependencies. The framework also requires explicit modelling of transaction costs tied to portfolio turnover, not just position size, and an examination of profit concentration across individual trades. Chronological cross-validation is recommended to reveal whether strong backtest results are driven by a single favourable period rather than consistent performance. The author has packaged the post-hoc audit checks into an open-source Python tool called Backtest Guard, which analyses exported CSV data and generates reports in HTML, text, and JSON formats.

Midline Launches as API Security and Observability Gateway for Early Testers

A developer has publicly launched Midline, a multi-tenant API gateway available at usemidline.com. The tool sits between API sources and endpoints, inspecting, classifying, and logging every request — including webhooks — before forwarding them. It is designed to address common pain points such as dropped payloads, unreliable webhooks, and lack of visibility into API traffic. The creator is currently inviting early testers from the developer community to trial the product and provide feedback. Interested users can request early access via comments or direct message.

How Claude Code Workflow Skills Can Take a Feature from Idea to Implementation

A developer on DEV Community has outlined a practical workflow using multiple Claude Code skills to streamline the process of building software features, using an AI-powered bookmark collection manager as a working example. Rather than jumping straight into implementation, the workflow begins with a 'grill-me' skill that guides structured product decision-making before any code is written. Additional tools like Ponytail, UI/UX Pro Max, and Hallmark handle complexity management, design consistency, and interface structure respectively. Skills such as 'i-have-adhd' and 'Caveman' help maintain focus and keep conversations concise during development. The author emphasizes that the value of these skills lies not in improving the AI model itself, but in addressing the surrounding challenges of clarity, consistency, and continuity in real-world coding projects.

Sen. Lummis Says Crypto Market Structure Bill Talks Have Hit a Wall

U.S. Senator Cynthia Lummis, a leading advocate for crypto legislation in Washington, has indicated that negotiations on the Crypto Clarity Act have stalled. Lummis, who has worked on the bill for over five years, says she has exhausted her willingness to make further revisions. The senator cited continued Democratic demands for additional changes as the key obstacle blocking progress. The impasse raises fresh uncertainty over the timeline for passing a comprehensive crypto market structure framework in the United States.

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WhatsApp Business API pricing in India: What changes on 1 October 2026

Meta's WhatsApp Business Platform has shifted from per-conversation billing to per-template-message billing since July 2025, with marketing templates costing ₹0.8631 and utility or authentication templates costing ₹0.1150 per message delivered to Indian numbers. Two significant changes take effect on 1 October 2026: free-form service messages sent within a 24-hour customer service window will become chargeable at ₹0.1150 each, and utility templates sent during an open service window will no longer be free. Each business phone number will receive a monthly free tier of 1,000 service messages, after which charges apply from the 1,001st message. Businesses without a payment method on file risk having messages beyond the free tier go undelivered, so Meta advises adding billing details before October. India-specific template rates are not changing on that date, meaning the existing rupee rate card remains in effect beyond the transition.

What Indian Developers Actually Pay to Publish an App on Apple's App Store in 2026

Publishing an iPhone app on Apple's App Store costs Indian developers approximately ₹9,500 per year, equivalent to the $99 USD annual Apple Developer Program membership fee. Unlike Google Play's one-time $25 lifetime fee, Apple's annual charge must be renewed continuously or existing apps get delisted and updates are blocked. Developers enrolling as an organization face additional requirements, including obtaining a D-U-N-S number, a verified legal entity, a company domain email, and a working website, all of which can add days to the process. Apple reviews 90% of app submissions within 24 hours, but over 40% of unresolved rejections stem from basic completeness issues such as crashes, placeholder content, or incomplete features. Solo developers and small Indian studios are advised to treat the annual ₹9,500 fee as a recurring operational cost rather than a one-time launch expense.

US rejects IRGC claim that Panama-flagged tanker hit naval mine

Apple Intelligence camera features for HomeKit require up to $60/month iCloud plan

Apple is introducing AI-powered security camera features to its Home app alongside the public release of iOS 27 and tvOS 27. The new capabilities include automated video summaries, a video search tool, and multi-camera footage stitching for HomeKit Secure Video users. Access to these features requires an iCloud Plus subscription, with plans starting at $9.99 per month for 2TB of storage and going up to $60 per month. The tiered pricing structure means the extent of AI features available depends on which iCloud plan a user subscribes to. The update marks Apple's push to bring its Apple Intelligence AI platform into home security monitoring.

Interim EC ruling on ‘real TMC’ likely on Sept 17

How Zustand Handles the 'Zombie Child' React Bug That Redux Struggles With

A technical analysis highlights a key architectural advantage Zustand holds over Redux, centered on a React rendering bug known as the 'zombie child' problem. A zombie child occurs when an unmounted or stale component continues executing logic and attempts to render with data that no longer exists, often causing crashes. This typically happens when state updates are triggered outside React event handlers — such as in setTimeout callbacks, Promises, or WebSocket listeners — causing children to render before their parent finishes updating. Zustand addresses this by wrapping updates in React's batching mechanism and internally using the useSyncExternalStore hook, which the React team built specifically to prevent zombie children, state tearing, and context loss. Because Zustand stores state outside React's component tree, it can deliver consistent, synchronized state snapshots to all subscribing components simultaneously.

Developer Builds Free Lip Sync Animation Tool for Blender Using Rhubarb

A Blender user with over five years of experience has released a free web-based tool that automates lip sync animation for 3D and 2D projects. The tool uses Rhubarb to analyze uploaded audio files and maps mouth movements to pre-made or custom mouth shape images. Users download the result as an image sequence, which can then be applied as a texture in Blender or other 3D software — no rigging or mesh deformation required. The developer built it using TypeScript, Supabase, a Rhubarb WASM package, and deployed it on Vercel. Originally created for Lego Brickfilm animations, the tool supports audio files up to one minute long and is freely available online.

Abbott Agrees to $385M Settlement Over Infant Formula Plant False Claims

Abbott has reached a $385 million settlement with US authorities over alleged false claims related to infant formula produced at its Michigan facility. The case stems from a 2022 recall and temporary shutdown of the plant amid concerns over bacterial contamination. Despite the settlement, Abbott maintains that no distributed formula tested positive for Cronobacter sakazakii. The company also noted that government testing found no bacteria present in any unopened products from the facility.

Cong rejects TMC proposal for bypoll pact

Developer Builds Browser-Based Phrase Anagram Generator Using Rust and WebAssembly

A software developer created Anagram Architect, a phrase-anagram generator that runs entirely in the browser using Rust, WebAssembly, and JavaScript. The tool works by breaking a source phrase into letter signatures, then recursively searching a dictionary to find multi-word combinations that use exactly the same letters. To prevent the search from freezing the browser, the workload is split across multiple Web Workers that explore different portions of the candidate space in parallel, achieving roughly 36,000 branches per second. Because exact anagrams are often nonsensical, the engine ranks results using signals like word frequency, part-of-speech patterns, and common phrase structures. In a demo search, typing 'The meaning of life' returned 'The fine game of nil' as the top-ranked result after evaluating over 222,000 combinations in about 26 seconds.

RFK Jr. and Andrew Wakefield headline sold-out anti-vaccine conference

Robert F. Kennedy Jr. appeared as a headliner at a sold-out anti-vaccine conference organized by his group, Children's Health Defense. The event also featured Andrew Wakefield, the discredited former doctor whose fraudulent research falsely linked vaccines to autism. The conference brought together prominent figures from the anti-vaccine movement under the banner of Kennedy's organization. Children's Health Defense has long been a leading group in promoting vaccine skepticism in the United States.

Engineer Documents 48-Hour Method to Reliably Reproduce Elusive Flaky CI Test Failures

A software developer spent 48 hours creating a structured approach to diagnose tests that pass locally but fail in CI environments, a problem commonly dismissed as 'works for me.' The method centers on four strict rules: no source edits until the failure is reproduced twice, every run must produce a machine-readable artifact, all hypotheses must be written before testing, and unresolved issues get a ticket rather than endless investigation. Instead of immediately debugging code, the engineer reframed the problem by building a condition matrix to identify what environmental factors the failure followed. AI tool MonkeyCode was used to generate ranked hypotheses from captured artifacts, with each suggestion required to have a falsifiable test before any source changes were made. The resulting workflow and tooling are now kept in a reusable tools/ folder, designed to make flaky test investigations reproducible and time-bounded.

EPA Rolls Back Emission Limits on Coal and Gas Power Plants

The US Environmental Protection Agency has eliminated restrictions on emissions from coal and gas-fired power plants. The agency argues the decision will result in significant cost savings for the country. Officials also claim the rollback will help bring down energy prices for consumers. The move marks a major shift in US environmental policy regarding the power sector.

'3 Cong CMs invited to Brics dinner but they didn't turn up'

One-Page Charter and Linter Script Proposed to Prevent AI Agent Pilot Failures

A software development post argues that most AI agent pilots fail not due to model quality but because of unclear ownership and poor handoff structure. The author proposes a single-page charter assigning three distinct roles — scout, scribe, and signer — each with defined responsibilities and a strict one-way handoff sequence. A hard-coded stop rule and a named revert command are required fields, ensuring the pilot has a clear exit path before it begins. A lightweight Python linter, designed to run in CI, validates the charter by rejecting missing fields, malformed dates, and placeholder text such as 'tbd' or 'todo'. The entire system is intended to fit on one wiki page and one script, reducing ambiguity and drift during time-boxed agent experiments.