- downloadDocuments(): fetches PDFs from product_documents and documents tables
using curl, organises into switches/ transceivers/ whitepapers/ other/ subdirs
- Integrated into runNightlyNasSync() — runs after JSON exports
- rsync incremental — only new/changed files transferred
- NAS dir structure: /volume1/tip-data/datasheets/{switches,transceivers,whitepapers,other}
- max-filesize 50MB guard per file
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