COSESAI

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Why Your CSV Drops 3 of 10 Columns (and the 4-Pass Resolver)

By xiezixing 2026年7月20日

What if 3 of your 12 critical columns are silently blank, and your vendor insists…

Spreadsheet headers and sample rows becoming a reviewable JSON Schema contract

Your Spreadsheet Is Already an API Contract. You Just Have Not Written It Down.

By xiezixing 2026年7月19日

Infer a reviewable JSON Schema from XLSX headers and sample rows before the first irreversible data import.

Article cover poster for Words to Number text-processing tool article

When Your Auditor Writes Numbers in English

By xiezixing 2026年7月17日

Number words are the kind of data no one notices until they break the pipeline.…

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Cron Expression Visualizer: 5 fields, 2 dialects, 1 timeline that tells the truth

By xiezixing 2026年7月15日

Before you ship that cron job to prod, paste the expression into a visualizer and check the next 10 runs land where you expect. Standard vs Quartz, timezone drift, and field-by-field parsing.

CSV Transformer — six declarative operations that replace most ad-hoc pandas scripts

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Six Operations That Replace Most of Your Ad-Hoc pandas Scripts

By xiezixing 2026年7月9日

The CSV Transformer at elysiatools.com — six declarative operations (rename, add_column, remove_column, convert_type, calculate, filter_values) that turn messy CSV cleanup into a JSON file the next person can read.

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Cron Expression Generator: The Five-Field Decision Nobody Reads on Monday

By xiezixing 2026年7月6日

Six to nine characters decide whether your cron job fires every minute, every workday, or never. Here's the syntax that drives every Unix scheduler, and why a generator matters more than typing speed.