Business-contact cleanup | Synthetic demo

Self-directed synthetic demonstration, created with AI assistance. All 30 business-contact records are fictional and use example.com email strings. No paid-client work or earnings are claimed.

The workflow preserves the original CSV, standardizes documented fields, and logs every change. It retains 27 records, logs 3 repeated rows omitted under exact normalized-field rules, and keeps 5 possible-duplicate pairs separate for review. The field log records 43 changes.

Checks: 18 automated assertions passed, with source-row lineage and unchanged original-file verification. The workbook includes summary, original and cleaned records, review queue, and change log.

Boundaries: email checks cover limited syntax only, not mailbox existence or deliverability. Missing data is not guessed. This 30-record sample is not a production-scale benchmark. Workbook and reproducible source files are available for review.