Send http requests on a periodic schedule.
This is an implementation of a http webhook-calling cron service running on
Convex. Cronvex was built as a demo of user space
crons as implemented in cronlib.ts. We'll eventually port these directly
into Convex but in the meantime you can copy this file if you want to add user
space crons to your own Convex project.
A user space cron, as opposed to the built-in crons that come by default with
Convex, allow declaration of crons at runtime. The built-in crons in Convex can only be defined statically, in a file called crons.ts.
This project is described in more detail in the blog post Cron Jobs in User Space.
See http://cronvex.com for a free hosted version of this service.