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ProgrammingDEV Community ·

A Valid PNG Can Still Be the Wrong Tesla Wrap: Debug the UV Map First

Your file is PNG, its dimensions look right, and the export finishes without an error. Then a stripe lands on the wrong body panel. A valid image can still use the wrong template or place artwork in the wrong mapped region. A Tesla custom wrap is artwork for a digital vehicle visualization. Treat its template as a mapping contract: select it before drawing, preserve its canvas, and inspect where the pixels land before diagnosing the transfer process.

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ProgrammingDEV Community ·

Colspan tables shredded my HTML-to-Markdown output — Markdown can't express merged cells

A user fed a cloud vendor's pricing page through my HTML-to-Markdown endpoint and got back a table where every plan's price sat in the wrong column. The page's comparison table used colspan for a tier header spanning three cells and rowspan for a plan name covering two rows. My converter processed each row independently — row count became pipe count. Rows under a colspan came out shorter, and whichever Markdown parser consumed the file aligned what came next with whatever column was open. A RAG pipeline downstream then quoted the wrong plan for a feature, which is how I found out: the answer l

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ProgrammingDEV Community ·

Why I Built FileZenith: A 100% In-Browser PDF & Image Studio (Zero Server Uploads)

Every time you want to compress a PDF, convert a document, or resize a photo for a government job form, traditional online tools ask you to do the same dangerous thing: "Upload your file to our server." Think about what users upload every single day: Income tax returns and bank statements Medical records and health insurance forms Government IDs (Passports, Aadhaar cards, Social Security numbers) Confidential legal contracts Most popular web tools send these sensitive files to remote servers across Europe or the US, process them behind closed doors, and promise to "delete them within 2 hours."

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ProgrammingDEV Community ·

Handling Connection Pool Exhaustion in ASP.NET Core APIs

Quick Answer handling connection pool exhaustion: Tuning MaxPoolSize, setting short ConnectionTimeouts, and using Polly retry/circuit‑breaker logic prevents ASP.NET Core connection pool exhaustion. In a micro‑service that serves 5 kRPS against Azure SQL, the ADO.NET connection pool is the invisible bottleneck that turns a well‑designed API into a cascading failure. Every request that reaches the DbContext layer pulls a socket from a shared bucket. If that bucket is empty, OpenAsync blocks until the ConnectionTimeout expires, turning a quick 20 ms query into a 15‑second timeout. The result is a

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ProgrammingDEV Community ·

WordPress 7.1 'Mary Lou': The Full Album, Track by Track 🎷

It's late, but here is the full breakdown of all the features of WordPress 7.1, and it's worth exploring. 🙌 Yes, I know. WordPress 7.1 landed on August 19, 2026, and I'm showing up with the party snacks when everyone has already gone home. 😅 But here's the thing: most "what's new" posts were written before the release, from beta notes and roadmaps. Now that the dust has settled, we can look at what actually shipped, what quietly got cut, and what's worth your time.

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ProgrammingDEV Community ·

Working with ZIP Files Entirely in the Browser Using JSZip

ZIP compression in the browser used to require a server round-trip. JSZip changed that. Here's a practical guide to creating and extracting ZIPs client-side. import JSZip from 'jszip'; async function createZip(files) { const zip = new JSZip(); for (const file of files) { const buffer = await file.arrayBuffer(); zip.file(file.name, buffer, { compression: 'DEFLATE', compressionOptions: { level: 6 } }); } const blob = await zip.generateAsync({ type: 'blob', compression: 'DEFLATE', compressionOptions: { level: 6 } }); return blob; } Compression level 6 is the DEFLATE default — a good balance betwe

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ProgrammingDEV Community ·

JSON in Production: 7 Subtle Bugs That Break Web APIs and How to Debug Them

JSON in Production: 7 Subtle Bugs That Break Web APIs and How to Debug Them JSON (JavaScript Object Notation, RFC 8259) is the undisputed lingua franca of modern software engineering. Every REST API, GraphQL payload, configuration file, and serverless invocation relies on it. Because JSON syntax looks remarkably simple—just braces, brackets, strings, numbers, and booleans—most developers assume serialization and deserialization are foolproof. In production systems, this assumption leads to silent data corruption, crashing background jobs, and intermittent API failures. In this engineering guid

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ProgrammingDEV Community ·

Comeback dev.to Wave Language Announcement

We’re bringing back dev.to as the official announcement channel for the Wave language. It’s great to see you all again. I’m LunaStev, the founder of Wave. Wave is currently preparing for its release. So, in addition to our GitHub release notes, official community, official Discord, official Bluesky, my personal X, and my personal LinkedIn, we’ve now added dev.to.

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ProgrammingDEV Community ·

UUID v4 vs. UUID v7 vs. ULID in 2026: Database Index Performance, B-Tree Fragmentation & When to Migrate

UUID v4 vs. UUID v7 vs. ULID in 2026: Database Index Performance, B-Tree Fragmentation, Collision Mathematics, and RFC 9562 Migration Guide For more than two decades, software architects faced an infuriating database design compromise when selecting a primary key strategy: Auto-Incrementing Integers (BIGSERIAL / AUTO_INCREMENT): Perfect for B-Tree index locality and fast inserts, but disastrous for distributed systems, horizontal sharding, and security (exposing sequential transaction volumes, customer IDs, and inviting scraping enumeration attacks). UUID Version 4 (RFC 4122): Perfect for zero

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ProgrammingDEV Community ·

Before/after: CRM made agent-ready

Let's walk through the same task twice: "Find every enterprise deal closing this quarter and draft a follow-up for each owner." Before: the agent loads the CRM. It reads the pipeline page like a screenshot, guesses which column is "Close date," and tries to click a filter it can't quite see. Each page of results is another full page-load of tokens. It misclicks, loses the filter, starts over. The follow-up drafts get typed into the compose box one character at a time through keystrokes, because there's no other door in.

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ProgrammingDEV Community ·

Why a missing JavaScript file can stay missing after you deploy it

I built cachewhy around a small but costly HTTP cache mistake. Imagine a request for /missing.js that returns 404 with Cache-Control: public, max-age=2678400. That lifetime is 31 days. A browser may reuse the missing response even after the file is deployed. Changing the server header helps new responses, but it does not automatically erase a copy the browser already holds.

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ProgrammingDEV Community ·

A beginner's guide to the Laya model by Convaiinnovations on Huggingface

This is a simplified guide to an AI model called Laya maintained by Convaiinnovations. If you like these kinds of analysis, you should join AImodels.fyi or follow us on Twitter. laya is an open-source, non-autoregressive System 1 decision model from convaiinnovations. It accepts a text state—such as an email, support ticket, conversation state, or JSON document—and typed questions, then returns structured answers with probabilities and confidence scores. The most important point is that it is a decision model, not a text generator: it does not produce free-form text, which removes generation p

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ProgrammingDEV Community ·

FlashLoopAdapter Exploit: How a Caller-Authentication Flaw in Aave V3 Safe Module Drained $305K

Decentralized finance security extends far beyond the core smart contracts of major lending protocols. As users increasingly rely on peripheral modules to automate complex strategies, the integration layer itself becomes a prime target for malicious actors. This reality was starkly illustrated on October 1, 2026, when a custom Ethereum module known as FlashLoopAdapter was exploited, resulting in the loss of approximately $305,000 to $310,000 from two Safe wallets. Crucially, the breach did not compromise Aave V3’s core lending infrastructure. Instead, attackers identified and leveraged a criti

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ProgrammingDEV Community ·

A beginner's guide to the Lang-Segment-Anything model by Tmappdev on Replicate

This is a simplified guide to an AI model called Lang-Segment-Anything maintained by Tmappdev. If you like these kinds of analysis, you should join AImodels.fyi or follow us on Twitter. lang-segment-anything combines language prompts with image segmentation, allowing you to identify and isolate objects in images using natural language descriptions rather than spatial coordinates. Built by tmappdev, this model merges natural language understanding with the Segment Anything foundation model to enable text-driven mask generation. The critical distinction from traditional segmentation approaches i

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ProgrammingDEV Community ·

Git 3.0 Is Switching to SHA-256. One Git Co-Creator Says It Will Be a Costly Mistake.

Two weeks ago I helped a teammate migrate a legacy service from Bitbucket Server to GitHub. The migration went fine. The post-mortem did not, because it turned out half our CI scripts parse commit hashes with a 40-character regex, and the new hashes are 64 characters. It took a full day to find every spot. I am telling you this because Git 3.0 is about to make that problem everyone's problem.

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ProgrammingDEV Community ·

A beginner's guide to the Sa2va-4b-Image model by Bytedance on Replicate

This is a simplified guide to an AI model called Sa2va-4b-Image maintained by Bytedance. If you like these kinds of analysis, you should join AImodels.fyi or follow us on Twitter. sa2va-4b-image is ByteDance’s image model in the Sa2VA family, which combines SAM-2 segmentation with a multimodal large language model (MLLM) to connect natural-language instructions with image regions. It accepts an image and a text instruction, then returns a text response and an image URI. The research describes Sa2VA as a unified system for question answering, visual-prompt understanding, referring segmentation,

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ProgrammingDEV Community ·

Running EF Core migrations across tenant databases

Checked against Tenantry 0.5, .NET 10 and EF Core 10. With one database for everyone, a release applies its EF Core migrations once, with dotnet ef database update or a dotnet ef database update updates one database at a time. This post looks at what that takes, first by hand and then with Tenantry Pro's migration runner. Given Tenantry Core's tenant scopes, each of which connects the context to its tenant's database, the first version foreach (var tenant in await tenants.GetAllTenantsAsync(ct)) { await using var scope = scopes.CreateScope(tenant); var db = scope.ServiceProvider.GetRequiredSer

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ProgrammingDEV Community ·

Add multi-tenancy to an existing ASP.NET Core application

Checked against Tenantry 0.5, .NET 10, EF Core 10 and PostgreSQL 16. Most applications do not start multi-tenant. They gain a second customer, then a third, and every query gains a WHERE OrganisationId = …. One query without it shows a customer another customer's data. This post adds tenant isolation to an application like that with Tenantry Core, the open-source part An ASP.NET Core API over EF Core and PostgreSQL.

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