How I built a flash-sale engine that can't oversell
I created this piece of content for the purpose of entering the H0: Hack the Zero Stack hackathon. #H0Hackathon The problem (that's harder than it sou…
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The Multi-Tenant Fortress: Bank-Grade Data Isolation in PostgreSQL
In a multi-tenant B2B platform, data leakage is an extinction-level event. If Property A logs into your dashboard and accidentally sees the guest data…
Indexes: Quickstart Using PostgreSQL (15 sec read)
Let's consider a table user . When we execute a query to find Emily , we are actually going through each record , looking whether the name column equa…
Designing an Expiring-Points System on an RDBMS (with Benchmarks)
This is an English rewrite of an article I originally published in Japanese. I've run the design on PostgreSQL 17 in Docker and folded the measured nu…
Linux Fundamentals for Data Engineering
Introduction As a data engineer, most of your work will happen on Linux servers. Whether you are managing databases, running data pipelines, or proces…
PostgreSQL 22003 Error: Causes and Solutions Complete Guide
PostgreSQL Error 22003: Numeric Value Out of Range PostgreSQL error code 22003 ( numeric_value_out_of_range ) is raised when you attempt to store or c…
Parse, Don’t Guess
Three days before going open source, I deleted my parser's smartest feature. 333 lines. 6 functions. 12 passing tests. All green, all clever, all gone…
How to see running queries in Postgres and kill them
Something is slow. Maybe a page takes forever to load, maybe a migration is hanging, maybe your Supabase dashboard just spins. You suspect a query is …
PostgreSQL 2200G Error: Causes and Solutions Complete Guide
PostgreSQL Error 2200G: Most Specific Type Mismatch PostgreSQL error code 2200G ( most_specific_type_mismatch ) is a SQL-standard data exception that …
Advice Needed: Best Way to Build a Hospital Medicine Tracking App as a Beginner
Hi Dev Community! I am a CS graduate. I want to build an industry-standard full-stack app for my portfolio on my own. Recently, I have learned the bas…
Defeating the OFFSET Penalty: Cursor Pagination in Laravel
The Hidden O(N) Pagination Trap When building data-heavy B2B SaaS platforms at Smart Tech Devs, rendering lists of invoices, logs, or user rosters is …
Build a Secure API with Rails 8 - Part-4: SSL, CSRF & Serialization
Hey folks 👋 Welcome back. In Part 3 we built all five auth endpoints, added Rack-Attack rate limiting, hardened the HTTP headers with secure_headers ,…
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Securing PostgreSQL, in the order an attacker would try things Dan Draper Dan Draper Dan Draper Follow for CipherStash Jun 10 Securing PostgreSQL, in …
Securing PostgreSQL, in the order an attacker would try things
Postgres has a well-earned reputation for security. Roles, privileges, host-based authentication, SCRAM. The primitives are all there, and they're goo…
PostgreSQL 2201X Error: Causes and Solutions Complete Guide
PostgreSQL Error 2201X: invalid row count in result offset clause PostgreSQL error code 2201X ( invalid_row_count_in_result_offset_clause ) is thrown …
Indexing & Query Optimization: How to Make Your Database Fast
Imagine you have a huge vendors table in an e‑commerce system, and thousands of orders are created every second. Every time a new order comes in, the …
Using TimescaleDB and Collectd for observability
I have used many timescale databases over the years and have found most to be wanting. Often over complicated and under performant. PostgreSQL with Ti…
Build a URL shortener with Fitz: HTTP + Postgres + auth in 30 minutes
A step-by-step tutorial through Fitz. We start from fitz new , finish with a native binary running in Docker. No external dependencies. No pip install…
RUM—Storing More in the Index
This series of posts traces the evolution from GIN to RUM to Extended RUM, showing how a single architectural idea—store more in the index to do less …
Self-Host Postgres or Use Supabase? Here's How to Decide
Short answer first: use Supabase if you want Postgres plus auth, realtime, storage, and a dashboard as one managed bundle. Self-host Postgres – or use…
PgPool2 & PostgreSQL — Bypass SCRAM entirely, use MD5
SCRAM + AES decryption is tricky to get right. The fastest working solution is to switch to MD5 in pool_hba.conf Step 1 — Edit pool_hba.conf sudo nano…
RAG with Postgres pgvector in 2026: the full TypeScript pipeline.
RAG with Postgres pgvector in 2026: the full TypeScript pipeline. I spent a week evaluating dedicated vector databases before deciding to just use the…
PostgreSQL 2200D Error: Causes and Solutions Complete Guide
PostgreSQL Error 2200D: invalid escape octet The 2200D: invalid escape octet error occurs in PostgreSQL when a bytea value contains an invalid escape …
Building Hybrid Search with PostgreSQL, pgvector, and Citus
Search looks simple from the outside. A user types something like: short-range copper module and expects the system to return the right product, maybe…
Extended RUM in DocumentDB extension for PostgreSQL: Efficient ESR (Equality, Sort, Range) Queries
Last year, I examined RUM indexes within this series on multi-key indexing, demonstrating that they cannot substitute MongoDB's compound indexes for s…
Смотрим в будущее на Go — Theta прогнозирование финансового модуля ERP
Зачем предприятия ведут учёт? Отчётность перед ФНС? Или может воронка клиентов? Сотни ответов российского рынка учётных систем на этот простой вопрос.…
Database Index Anatomy: Performance and Resource Management
Database Index Anatomy: Performance and Resource Management While developing a production ERP, when I saw query times suddenly double, I realized that…
Supabase basics with Node.js
Supabase is an open-source backend platform built around managed PostgreSQL. You get a database, auto-generated REST APIs (via PostgREST ), Auth, file…
How to Choose Database Indexes in 3 Steps
Database index selection, in my nearly 20 years of experience, has often been a critical topic that is either overlooked or misunderstood. Many develo…
ParadeDB NPM Package Seeks Feedback on Simplifying Postgres Integration with JavaScript via Drizzle ORM
Introduction: Bridging the Gap Between Postgres and JavaScript with ParadeDB The ParadeDB NPM package emerges as a targeted solution to a growing pain…