Probe adoption expiration

[MartinKolarik]

Probes are supposed to stay adopted for up to 30 days of being offline. We track the sync dates, but I don't think there's anything that would delete them yet. We should (assuming the probe's last sync date is 2024-10-12):

• on 2024-10-14 send a notification to the user "Your probe went offline", "Your probe [name (IP)] has been offline for more than 24 hours. If it does not come back online before Nov 12, 2024, it will be removed from your account."
• on 2024-10-12 remove the probe and send another notification "Your probe has been deleted" "Your probe [...] has been deleted from your account due to being offline for more than 30 days. You can adopt it again when it is back online."

We can later improve the notifications speed and add emails in jsdelivr/globalping-dash#27.

[MartinKolarik]

I found we actually do have the expiration logic, so we just need the notifications.