Implement out-of-storage safety-mechanism in key pods (eg. postgres), by including an ~50mb empty file (so can delete manually in emergency to free up space; arguably not needed once full-fledged stats/health reporting system is in place)

Implement out-of-storage safety-mechanism in key pods (eg. postgres), by including an ~50mb empty file (so can delete manually in emergency to free up space; arguably not needed once full-fledged stats/health reporting system is in place) #209