Ability to create probe via sms

[Daskott]

A user can text the server something like:

probe 15m

And a probe will sent to the user in 15m, with 0 retries. Can be done through scheduled jobs.

TODO:

• user.probe_settings should have max_retries & wait_time_in_minutes(i.e. time to wait for a reply after which the probe is retried or is marked as unavailable)
• When creating a probe use the users user.probe_settings to set max_retries & wait_time_in_minutes - they should also be fields in probe.
• Add scheduledAt column to jobs table.
• When user sends sms command, create a job added to the scheduled queue & set scheduledAt(i.e. when the job should be run)
• Create a new worker that only pulls jobs from the scheduled queue & move them to the enqueued queue if scheduledAt <= time.Now()
• The scheduled job should have ["probe_max_retries"] arg set to 0. So after the user's dynamic probe triggers, if they don't reply, immediately mark as unavailable & contact emergency contact.

Enhancement:

• Move this logic into a database query:

  kronus/server/pbscheduler/pbscheduler.go

  Lines 126 to 138 in 14355ab

  	// Only send out followup probe after at least 1 hour after the last probe was sent,
  	// until max-retries. So the user has enough time to respond.
  	//
  	// E.g sendInitialProbe @ 5:OOpm
  	// Follow up 1 will be @ ~6:00pm
  	// Follow up 2 will be @ ~7:00pm
  	// Follow up 3 will be @ ~8:00pm
  	//
  	// And if no respons, @ ~9:00pm send out emergency probe
  	if time.Since(*probe.UpdatedAt) < 1*time.Hour {
  	continue
  	}

Note:

• Perhaps multiple retries & shorter wait times for dynamic probes
• The ability to do this via text should be deprecated at some point, but the feature can still be used in a diff interface