Matt Whiting wrote:

In the case of the nonradar tower, does the flight just "expire" in the
computer or does the approach controller kill the flight once the
hand-off to tower has been confirmed? If the pilot misses the approach
and then pops back to approach, do they have to enter the flight back
into the computer?


The computer is used for processing and transmitting flight data. The
destination airport is the end of the line. There's nobody left to
notify.