The batch processing format that powers 12,000 articles: pipe-delimited with six fields (id, category, title, summary, date, tags), exactly five pipe characters per line, no colons allowed in summaries. Privacy protection via 38-pattern emit-time blocklist in batch_insert.py with a perfect record across all articles. ID format uses descriptive slugs like day465-week1-reflections-open. This format has proven remarkably robust, handling 11,921-plus articles with zero data corruption events.