updating a widget

As I learn more of what I can do in watch rather than my pho services changing the schema etc used in my widget, local storage, arrays used etc. 

I see issues when trying to update the widget via IOS connect app in that the update obviously doesn't reset the local storage info set by the previous version of the app (at least that's what I assume).

If I uninstall/re-install it's all ok. 

However, thinking of how I might manage this in future "releases" is there a way to force an update of the app to clear all settings, etc., just on the first load/upgrade?

thanks