You may have noticed during your development that if you submit two identical address segments with different start_date's that the API will create a new address segment record for each. In order to reduce the number of redundant records in the address_segments database, you should update the PUT /api/persons/:id/address endpoint to check if the new address segment is identical to the latest segment, and if it is it should skip creating a record and return the already existing segment.
In order to assist with implementing this behavior we have provided a failing test case.