backend: Refresh the web page every minute to prevent stale data

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Add more fields to registration record (#1) and prevent dups (#4)

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
TemperatureEndpoint: Remove unused import

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>