43 articles tagged #Database
You committed new rows to an SQLite database, queried it right after, and the old data came back. This is a classic isolation and connection-caching trap in Python's sqlite3 module — here's exactly how to fix it.
Supabase and PlanetScale both promise hassle-free databases for production, but their free tiers, scaling ceilings, and operational quirks differ in ways that only show up when traffic spikes. Here's what we found after pushing both hard.
Run your Python sqlite3 script twice and suddenly your database has double the rows. This guide explains exactly why duplicates happen and gives you battle-tested strategies to stop them permanently.
Catch normalization mistakes, missing indexes, and naming inconsistencies before a single migration runs. Here's how to prompt ChatGPT to give you a real schema review — not generic boilerplate advice.
ChatGPT can draft a data migration script in seconds — but without the right prompting strategy, you'll get plausible-looking SQL that silently drops rows or mangles foreign keys. Here's how to prompt it correctly and verify what it gives you.
Your SQLite query runs without errors, but fetchall() hands back an empty list — even though the data is clearly there. Here are the most common causes and how to squash each one fast.
Your PostgreSQL queries were fast at 100k rows, but now that the table has crossed a million records, everything crawls. Here's exactly what's happening and how to fix it without rewriting your entire schema.