Tell it what you actually run
Register the things maintenance touches — services, databases, clusters. This is the one bit of setup, and it's what makes everything after it possible.
What happens
You add each one once. Retired resources get archived rather than deleted, so past work keeps its context.
Why it matters
A calendar only knows about time. Once MaintMode knows pg-prod-eu-1 is a thing, it can tell you two people booked it for the same hour.
Checkpoint. Your resources are registered and ready to be attached to work.


