The deploy was green. The build passed. And my data just... stopped updating. No crash. No red. No alert. Just a table that quietly stopped getting new rows, which is the worst kind of bug, because nothing tells you it's happening. You find out when you notice the numbers look stale and think "huh, that's weird," three days later.
Here's the trap I fell into, and the debugging lesson I wish I'd had tattooed on my arm before I started.
The setup
I had a small cron Worker running on Cloudflare. Every few hours it pulled a list of items from an external API and upserted them into Postgres. Boring. Reliable. Ran fine for weeks.
Then I shipped one new feature: for each item, fetch an extra bit of metadata from a second endpoint before saving. One more fetch() per item. Felt harmless.
