`docspell-consumedir` (`dsc`) processes files before scanning is complete

When scanning documents directly into a folder watched by the `docspell-consumedir` container, my scanner creates the file immediately and continues writing to it as each new page is scanned. This causes `dsc` to start processing the file before the scan has finished, resulting in incomplete or corrupted imports.

I can mitigate this somewhat by setting the `dsc watch --delay` option to a large value, but that introduces a trade-off:

* A longer delay allows multi-page scans to finish before processing.
* A shorter delay enables faster curation in Docspell but risks partial file processing.

At the moment, I’ve set a delay of around five minutes and avoid delete or move operations after processing to prevent data loss. However, this is not an ideal or reliable long-term solution.

### Question / Request

Is there a better way to ensure that `docspell-consumedir` only processes files after they are fully written by the scanner?

I wish I could configure my scanner to have an extension suffix (.tmp) for incomplete files, but that doesn't seem to be possible.