Product wants a full environment per pull request. How do you build ephemeral Terraform previews that do not torch the budget?

Preview environments succeed or die on teardown: webhook destroys plus a nightly janitor with a TTL. Get the data policy and cost tagging right or the invoice ends the experiment before the demo does.

Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.