Request_logs on Google App Engine - append erases for new version?
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I set up a cron job to download the logs using the following code:

    echo [password] | appcfg.py request_logs --num_days=1 --severity=0 --append --passin --email=[user] --quiet /tmp/code/ ~/site_logs/`date +%m-%d-%y`.txt

I run it every 5 minutes, which is great for having the latest logs available to grep through.  However, if I bump the version number, the log doesn't seem to honor append.  It just writes over the file.

Am I missing something?  Is there a better way to get this to continuously dump the logs to disk?