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Summary
While STATEMENT-level triggers are better for bulk operations, being vastly more performant when INSERTing or DELETEing large swaths of data, ROW-level triggers can be more performant on individual UPDATE operations, since they can opt not to update the haystack if none of the indexed fields are actually updated. This update gives the option to use one or the other depending on application concerns (though it still defaults to STATEMENT as before).