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Take a look at DOC-53267 in the community. It states the following. Have a look-see and see if this helps you out.
You can update the following key in HeatSoftware\Heat\appserver\web.config
First backup the webconfig before making any changes.
Modify the below field for your needs.
<add key="LimitSchemaChangesForAboveNRows" value="1000000" />