Tim,

I think you will still need your pk - what if a file is put in twice

I would - to decrease the odds

(1) Not process any file that is say less than a minute or so old
(2) lock the file prior to processing it. If you cannot lock it - skip it for the moment
(3) after deletion of the file - verify it's no longer there


or, is there any means of processing them immediately instead of saving them to file first ?

Success,