184 articles tagged #Debugging
You added an index, ran your query, and EXPLAIN ANALYZE still shows a sequential scan. Before you blame PostgreSQL, there are at least six specific reasons this happens — and each one has a clear fix.
xlsxwriter's autofit method sets row heights that look right in the preview but end up clipped or oversized in Excel. Here's why it happens and exactly how to calculate correct row heights yourself.
A fetch call with no timeout will wait forever if the server stalls or drops the connection silently. Learn exactly why this happens and how to implement abort-based timeouts, retry logic, and proper error handling in JavaScript.
Bulk-inserting rows into PostgreSQL and watching foreign key violations disappear without an error? This guide explains exactly why that happens and how to force PostgreSQL to catch every violation reliably.
Lambda cold starts can turn a 50ms function into a 3-second timeout behind API Gateway — and the root cause isn't always obvious. Here's how to diagnose what's actually happening and fix it systematically.
Your Django signal handler is running twice, three times, or more — and you have no idea why. This guide breaks down every common cause, from duplicate receiver registration to AppConfig mistakes, and shows you exactly how to stop it.
You've enabled text_wrap in xlsxwriter but Excel still cuts off your long strings mid-sentence. The culprit is almost always row height — xlsxwriter doesn't auto-expand it for you. Here's how to fix it properly.
You wrote the data, created the chart, and opened the file — only to find an empty chart frame staring back at you. Here are the exact reasons xlsxwriter charts go blank and how to fix each one.
Your cursor is flying across the screen on its own, clicks are landing in the wrong place, and you're convinced the trackpad is dying. Before you book a repair, try these software and settings fixes — most ghost input problems are solvable in minutes.
You applied conditional formatting with xlsxwriter, filtered the sheet, and the formatting just vanishes on hidden rows. Here's exactly why it happens and how to fix it without rewriting your whole pipeline.
xlsxwriter merges cells but your bold text, background color, and borders vanish in the output file. This is a known quirk of how xlsxwriter applies formats to merged regions — and fixing it takes one extra step.
If your FutureBuilder keeps restarting its Future on every parent rebuild, your data re-fetches on every keystroke, scroll, or tap. Here's why it happens and exactly how to stop it.