It actually happened a few days ago but I wanted to wait until I was sure they weren't going to ask for a refund before celebrating.
After a year of putting this project on hold despite all the interest it received, I finally decided to push out the top 2 features people were asking for (sending on specific days + and an archive).
I sent out an email to every account that had saved a link in the last 2 months letting them know about the new feature, and despite screwing up the CTA link, I got someone to sign up.