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A system isn't finished when it works, it's finished when someone else can operate it when it breaks. Every build ships with runbooks: deploy, rollback, incident response, and a plain-language handover. Below is a real, abridged example from a production literary platform.
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Zero-to-production
Ordered because order matters, seed users exist before the seed migration runs, env vars exist before the first deploy, the site URL is set before DNS cutover.
Create the Supabase project in af-south-1 (Cape Town); create the auth users before the seed migration so profile/story seeds resolve by UUID; run migrations strictly in order; confirm storage buckets are set correctly.
Verify the email domain (SPF / DMARC / DKIM), obtain a long-lived social access token, and create the AI key, each with its own checklist.
Add every environment variable before the first deploy (never after); deploy; set the canonical site URL and redeploy so auth links resolve.
Point the apex and www records, then re-verify the site URL so password-recovery and OAuth links are cross-device safe.
Run a fixed checklist after every deploy: homepage + cover render, podcast page, AI assistant responds, admin login + role-redirect, draft save, editorial handoff, a test newsletter send (under 2 min), and an image upload.
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When something breaks
Three documented paths, self-serve email, dashboard-triggered reset, and an emergency force-set.
Move a story out of "published" (gone publicly within ~60s), soft-delete with deleted_at, or restore by clearing it, never a hard delete.
Check provider logs for bounces/rate-limits, cross-reference active subscribers, retry per-recipient, and mark hard bounces unsubscribed.
An error-code map (expired token / permissions / content flag) plus a token-rotation runbook: regenerate, extend, update the env var, redeploy.
Inspect the policy via pg_policies, distinguish the RLS-bound client from the service client, and test by switching roles.
Read the build logs; roll back by promoting the previous good deployment to production; redeploy to pick up env changes.
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The handover
Delivery includes a handover checklist written in plain language, what each remaining setting does, what a webhook is "in plain words," and a troubleshooting guide for the few dashboard-only steps. The code, the schema, the runbooks and the data are yours. This is the answer to the question every serious buyer asks about a small studio: what happens when you're not available? The system is documented well enough that the answer is "you, or anyone you hire, can keep going."
