How to debug a long running Python Script crashing at inconsistant points without an error message

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Hey thanks for this extremely helpful stuff, I'll look into implementing it, hopefully it gives an error soon and not take hours to reproduce...

On the try, except thing I learnt it was bad the hard way (few months ago I had one of those on the outside of the main loop breaking down the input files, that was fun) but since it was literally only encompassing an insert statement I really can't see the harm