Language understanding service to redact sensitive info in data rows.

この issue には説明がありません。

The issue names no files, tests, entry points, input format, or redaction criteria. First clarify the service's scope, sensitive-data categories, and expected behavior, then locate the relevant JavaScript entry point and tests. Done should be defined by agreed requirements and coverage for representative data rows.

索引モデルが issue の本文から書いたものです。