Send regular emails to ISP that are marked as "failed to fetch isp.json"
Currently, when ffdn-db fails to fetch the isp.json file, it deactivates the automatic updates and sends an email to the technical contact of the ISP. This email is often disregarded or forgotten, and the ISP stays deactivated more or less forever.
It could be a good idea to send regular emails to the technical contact while the ISP is deactivated, for instance once a week.