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No, question engine based requests have no character limit for the description field.
For Data Partners:
How are Summary Table model processors handled in question engine?
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The Sentinel team distributes a modular program called the summary table creation package that runs against your Sentinel Common Data Model dataset to create these text files.
Where can
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I find the slide deck presented during the Data Partner training sessions?
The slide deck is available here: Creating a SQL Server Summary Table Database
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