Add a bit of back padding to start date for descartes
Add a bit of back padding to start date for descartes

With forced interpolation, ensures that the data for start exists.

machiavellian/machiavelli,machiavellian/machiavelli,glasnt/machiavelli,glasnt/machiavelli,glasnt/machiavelli,machiavellian/machiavelli,machiavellian/machiavelli,glasnt/machiavelli