Set one schedule running
What you will learn Not a chapter to read but one to do. Set up one recurring schedule, then make it fail on purpose to see what happens when nobody is watching.
What you need
Keep that last line. Make your first schedule an email send and the first thing you learn will be something you cannot undo.
Step 1 — Queue it once first (5 min)
Do not go straight to recurring. Queue a single run.
What to look for
Check the second. A mismatched timezone, or a different reading of "tomorrow," is the most common surprise on a first schedule.
Step 2 — Promote it to recurring (5 min)
Once the single run worked, turn the same instruction into a repeat.
| To check | |
|---|---|
| Is the next run time shown? | □ |
| Is there a pause? | □ |
| Does the schedule survive a pause? | □ |
Press it and see for yourself on the third. Mistaking pause for delete is a common reason people never use it.
Step 3 — Make it fail on purpose (10 min)
This is the point of the exercise. Nudge the instruction slightly off so it fails.
What to look for
| What happened | Verdict |
|---|---|
| Left "no data" and stopped | ✓ properly designed |
| Produced an empty table and marked itself complete | the dangerous one |
| Filled in plausible numbers | fix the instruction immediately |
If you got the second or third, add these two lines and run it again.
When a person is watching, the person stops it. A schedule has no such person.
Step 4 — Tidy up (5 min)
Self-check
Check yourself
1. Why make your first schedule something that does not go outside?
Answer
So a mistake can be undone. First schedules usually have the time or the scope slightly wrong, and if that is an email send, it cannot be taken back.
2. Why make it fail deliberately?
Answer
To see what gets left behind when nobody is watching. An empty result marked complete, or invented numbers, are things no one catches — unlike work a person is sitting in front of.
3. What must a scheduled instruction always contain?
Answer
The behaviour on failure. An instruction to leave it alone rather than produce something is what stops wrong output from quietly accumulating.
Next, the ways in from outside → Channels — the ways in