The same bug, fixed three times: all my guards lived on the write side
There's a kind of bug that isn't hard to fix — it's just that it comes back . I run a small coffee e-commerce platform, alone. One inventory bug had a…
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Stop Guessing Batch Sizes: High-Performance Bulk Inserts in Spring Boot with PostgreSQL COPY
When you can't afford to guess the right batch size and don't want to pay for that lesson in production When I designed the persistence layer of a rea…
Shifting Left: How TDD Became the Foundation of SokoFlow's Core Engine
SokoFlow Build Log — Month 1 of 4 Last semester I set out on a new strategic plan to level up my software development skills through deliberate, proje…
How to add a NOT NULL column to a large table safely in Rails
A migration that runs in two milliseconds on your laptop can lock a production table for thirty seconds and pile up every request behind it. The gap i…
Zero-Downtime Migrations: A Step-by-Step Playbook
If you've ever typed ALTER TABLE on a production database and held your breath, this article is for you. Database migrations are one of the most dange…
Deploying Apache DolphinScheduler 3.1.9 Cluster with MySQL Instead of PostgreSQL? A Practical Docker Compose Guide
Background Today, we'll walk through one of the most requested deployment scenarios in the Apache DolphinScheduler community: deploying an Apache Dolp…
I shipped my first AWS + Vercel product in 7 days during a Meta attribution crisis 👋
Hi dev.to 👋 I'm Andres. Long-time builder, first-time dev.to poster. (Pretty sure I should have done this years ago.) Just shipped Ad Engine — a 24/7 …
Why I replaced DynamoDB with Aurora PostgreSQL Serverless v2 for an ad-ops monitoring workload
On February 14, 2026, Meta started enforcing health-data restrictions that broke pixel-based lower-funnel conversion tracking for DTC telehealth adver…
Circular Injection in Database Design.
What it is, why it happens, how it breaks your schema, and how to fix it for good. You are designing a database schema, tables are coming together nic…
PostgreSQL Upgraded to Latest Minor Versions on SQLize.online 🐘🚀
As the owner of SQLize.online , I’m committed to providing a playground that doesn’t just let you write code, but lets you test against the most stabl…
🔥 PostgreSQL vs SQLite – which one should you actually use for your web app or SaaS?
The choice between SQLite and PostgreSQL is a frequent point of confusion. The quick choice is: For almost any public-facing web app or SaaS, you want…
RAG with EF Core and pgvector
You can read the original post over on lukaswalter.dev . Developers often start RAG apps using tutorials that recommend dedicated vector databases. St…
Architecting Digital Trust: A Relational Deep Dive into the LocalHands Prisma Schema
Subtitle: How to model a secure, escrow-based marketplace for emerging economies using Prisma and PostgreSQL. Schema. In my previous article on Medium…