What should a Base44 client handoff include?

I could not find a Base44-specific handoff thread, so here is a compact checklist I would want before a client takes over an app:

1. Ownership: client-controlled Base44 account, billing, domain and DNS
2. Access: roles, integrations and secrets, plus a revocation plan
3. Data: current export and one documented restore test
4. Operations: every automation, usage cap and alert in one place
5. Continuity: last tested version, known issues, rollback path and a one-page runbook

The point is not more documentation; it is making sure the app can still be operated when the original builder is unavailable.

Which single line would you refuse to hand off without?