Can a prompt replace Relay.app?

Build a two-service automation with a human-approval step in the middle — Relay.app's actual differentiator over fully automated tools like this catalogue's Pipedream and Gumloop entries. Use TypeScript/Node.js with Postgres. Implement a fixed workflow: trigger (webhook), a data-fetch or transform step, a 'pending approval' step that pauses the run and emails a reviewer a link with the current data and approve/edit/reject actions, and a final action step, calling the second connected service's API, that only runs after approval. Store each run's state explicitly (pending, approved, rejected, completed) in Postgres so a paused run survives a server restart. The approval link should work without requiring the reviewer to log in first — a signed, single-use token is enough for a personal tool. Let the reviewer edit the data before approving, not just accept or reject it as-is. Do not build a library of pre-built connectors for many services, mobile push notifications, or team-shared libraries — those are out of scope; this automates exactly one pipeline between two named services, with one human approval point. Needs a domain for webhook and approval-link handling, a transactional email provider for approval notifications, and an OAuth app registration for whichever connected service requires it.