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The .tmp files simply shouldn't *be* there. I've tried to reproduce 
a situation where they're left hanging, but can't. 
 
. new demo mysql tracker 
. add new issue with message 
. edit messagesummary detector to always raise Reject 
. add new issue with message - rejected 
 
In both cases, the .tmp file was dealt with appropriately (ie. 
either renamed or deleted). 
 
I'm not going to modify the code to use the .tmp files, as it'll 
mask errors. 
 
Closing the issue, noting that the work-around is to rename the 
files. I'll be happy to provide a script to do so if anyone runs into 
this problem again.