- createTransport() called per-send from DB SmtpConfig (Pitfall 3 mitigation — not at startup)
- Injects SettingsService to load decrypted SMTP config per tenant
- secure/requireTLS mapped from encryption field (ssl-tls / starttls / none)
- Auth omitted when username absent (anonymous relay support)
- Attachment contentType: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
- Error path rethrows after generic log (T-07-10) so DkvService can run 3-retry backoff (D-16)
- Does not import @nestjs-modules/mailer abstractions
- buildExcelBuffer: 5-column xlsx per D-13 (Lieferdatum as string, never Date), SheetJS aoa_to_sheet
- resolveFahrzeug: replaces {Marke}/{Modell}/{Kennzeichen}/{Fahrer} tokens in format string (D-19)
- writeAndPrune: server-side filename DKV_YYYY-MM_<nr>.xlsx (T-07-09 path-traversal prevention),
writes to user-files/ (resolved from monorepo root, not request input), prunes to last 10 DKV_*.xlsx
files sorted by mtime ascending (D-15, Pitfall 7 atomicity)
- dkv-parser.validate.ts: empirical validation script against user-files/invoice.pdf
- 27 vehicle blocks, 66 transactions extracted (matches expected count)
- Handles two PDF extraction formats: single-tx (tab-separated) + multi-tx (columnar)
- German number parsing: replace(/\./g,'').replace(',','.') applied to km and menge
- Exits 1 with full raw text dump if zero vehicle blocks parsed (assertion guard)
- dkv-parser.service.ts: @Injectable() NestJS service wrapping validated logic
- parsePdf(buffer: Buffer): Promise<DkvVehicleBlock[]>
- Uses pdf-parse v2 class API: new PDFParse({data:buffer}) — NOT v1 pdfParse()
- Calls destroy() after extraction (T-07-01 memory safety)
- Generic error messages only on parse failure (T-07-02 info disclosure)
Regex adjustment vs Research Pattern 4: space-based regex replaced with
tab-split (single-tx) + columnar transpose (multi-tx) after empirical analysis
of actual invoice.pdf text extraction output.
schalli