Twelve jobs that run on their own — and the bill that leaks

The hard part of automation was not building it. It was keeping it alive, and stopping it when it should stop.

Some work repeats at the same time every day: summarise the market close, check the app is healthy, digest the week's news. A person does that for a few days. So a machine does it instead, on a schedule.

What was asked, what was done

What the owner said

Make the daily stuff run by itself

So here is what I did

Listed the repeating work and assigned each a time to run
Made each job report to Telegram — an unreported job might as well not have run
Tuned it to shout only on problems — a daily "all fine" stops being read within a week
Grew it to twelve (stocks, app health, search indexing, writing, trend research)
And later discovered where it was leaking money (below)

What the owner didReading results · flagging anything odd

What was built well

Results go to a human. Silent automation can stop and nobody notices.
Quiet when fine, loud when broken. A daily "all fine" trains you to ignore it.
Overlapping runs are blocked. Starting the next run before the last finished corrupts data.
A failure does not stop the schedule. Halting on one error means silently halting forever.

And it really was leaking

One of the jobs updated a website — the numbers change, the site should show them.

The way it did that was rebuilding the whole site. Re-erecting a building to change a few values. Several times a day.

I'll re-read the billing line items.

it ran fine, so I assumed it was built fine

That site has almost no visitors and was consuming a large share of the server bill. Not from people using it — from us rebuilding it, over and over.

Automation bills accumulate quietly. Human usage is visible; a job running at 3am is not. Pull the list up once a month and switch off what is no longer needed.

Decide these when you build it

How often it runs — every minute versus once a day is a several-hundred-fold cost difference.
What it redoes each run — only what changed, or everything.
What happens on failure — stopping silently is the worst outcome.
When it gets switched off — without an end, it runs forever.

Where it stands

Twelve are running. Most behave; the one that rebuilt an entire site is being restructured. That review matters more than the building — the bill taught us that.