Reduce conversion memory footprint

README.md

@@ -128,6 +128,8 @@ curl -X POST http://127.0.0.1:5000/convert \
 - Temporary output files are written to `instance/outputs`
 - The application does not require a database
 - Gunicorn is used as the production WSGI server
+- Parsing and export writing are streamed to reduce memory usage on large uploads
+- Sorting still materializes the filtered record set because global ordering by datetime or severity requires the full filtered input
 - Default upload limit is 100 MiB
 - Set `MAX_UPLOAD_SIZE_MB` to configure the upload limit in megabytes
 - `MAX_CONTENT_LENGTH` is also supported as a lower-level byte-based override