{
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  "source_id": "msg-18f9a2",
  "folder": "invoices/2026/05",
  "filename": "invoice-10492.pdf",
  "mime_type": "application/pdf",
  "size_bytes": 284112,
  "checksum": "sha256:6b5f...demo",
  "customer": "ООО Пример",
  "deal_id": "crm-5581"
}