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I am not sure why you are losing that first row of data - it might be automatically sorting the data and putting the row down further in the dataset. In that case, prior to the unique tool, add a Dynamic Rename tool to take headers from the first row of data.
That is unusual @hal_dal, however you could use the dynamic rename tool before your unique tool to convert the first row of data to headers using a rename mode of "take field names from first row of data"?
If this solves your issue please mark the answer as correct, if not let me know!