This is a hack, but you can probably make it work. When the user hits ESC, you can die. Then you can catch it and perform whatever cleanup that needs to be done:

sub enter_products {
  my @database = read_from_db();
  eval {
    while (1) {
      ...
      $comment = my_prompt "Enter comment";
      $descript = my_prompt "Enter description";
      $sku = my_prompt "Enter sku";
      $weight = my_prompt "Enter weight";
      $color = my_prompt "Enter color";
      ...
      $yn = my_prompt "Add another entry?", -yn;
      ...
    }
  };
  unless ($@ =~ /\AESC PRESSED/) {
    die $@; # propagate non-ESC exceptions
  }
  write_to_db(...);
}

sub my_prompt {
  my $input = prompt @_, -escape
  if ($input eq "\e") {
    die "ESC PRESSED";
  }
  return $input;
}
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