Is the number of columns limited for an Entity?

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I might have an Entity with possibly thousands of columns, and was wondering if it would pose any problem (nothing will be indexed):

  • Will queries be slower if the number of columns increases?
  • Can there be in theory an unlimited number of columns?

While I never had thousands of columns to know about the speed and performance, as it looks from the data viewer on the dashboard the number of columns should be unlimited: