Implemented the memory fix.

Changed app.py:
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process_pft_pdf() now uses the uploaded file stream directly instead of copying the PDF into bytes.
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Output now uses SpooledTemporaryFile, so larger generated PDFs spill to disk instead of staying fully in RAM.
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Explicitly closes PdfReader objects after writing.
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Removed @app.teardown_request gc.collect(), which was running too early and could break send_file.
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Added response.call_on_close() cleanup so the generated PDF stream is closed only after Flask/Werkzeug finishes sending it.
Changed Dockerfile:
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Added Gunicorn --max-requests 50 --max-requests-jitter 10 as a production guardrail against PDF-library or allocator memory growth.

Dockerfile

@@ -15,4 +15,4 @@ COPY . .
 EXPOSE 5000
 
 # Command to run the application using Gunicorn (production ready)
-CMD ["gunicorn", "--bind", "0.0.0.0:5000", "app:app"]
+CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--max-requests", "50", "--max-requests-jitter", "10", "app:app"]