From AI draft to tested automation: a complete pass

A webhook receives user signups; valid emails are stored in Postgres; the workflow runs unattended. Total AI cost for the initial build: 1 credit, plus small follow-up generations for fixes.

In Copilot, send: “When a webhook receives a new user signup, validate the email and save the user to Postgres.” Review the plan (webhook trigger → validation → Postgres), then generate the workflow.

Set the webhook path to register-user and write the insert query; save each node and confirm “Changes saved”. Create the Postgres credential inside n8n, run preflight, and deploy the inactive draft. Confirm the shown n8n ID with the read-back line.

Attach the Postgres credential to the deployed node in n8n, flip the workflow Active, and send a real test request. Watch the execution, fix anything red back in the chat, and redeploy. The automation is done when a real signup flows through an active workflow — not when the draft looks complete.