Super simple (and quite dumb) WinForms app to query and export multiple interpolated tag values from date ranges of your choice (using Proficy.Historian.ClientAccess.API) into a CSV file.
Might be helpful to someone to query historical values.
skybotz/export-interpolated-data-from-historian
Simple WinForms app to query and export interpolated tag values from Proficy Historian (using Proficy.Historian.ClientAccess.API) as CSV file
C#