I’ve been running https://kvdb.io as a side project for a while. This weekend, I woke up to a bunch of alerts that the server had run out of open file descriptors (rookie mistake, I never expected to receive more than a thousand simultaneous requests).

It turns out someone wrote a tutorial on how to automate COVID-19 appointment slot bookings and used KVdb to store SMS OTP codes. Never expected it, but a great surprise. Long tail of SaaS is just wonderful :)