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Is it possible to build a dashboard that will take user input, runs serveral searches, and displays multiple graph outputs? ... Without using post processing? the 10,000 post processing limitation is a deal breaker.
Sure, if you download the ui examples app, then take a look at "lister driving multiple element" app/ui_examples/advanced_lister_multiple_elements
Essentially you want to have user inputs, have a child ConvertToIntention which will allow you to put the input value into children searches. Take look at the How to user lister modules and the lister module specification