QR-master/tasks/lessons.md

Lesson: For lead scraping, do not rely only on pre-enrichment dedupe. Website crawling can assign the same corporate email to multiple locations, so exports must be deduplicated again by final email before use.

Lesson: Large API scraping runs should write incremental output or use smaller controlled batches. A long Overpass workflow can hang or rate-limit without producing files, making it hard to recover useful partial results.