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## Problem In order to build AZ aware scheduling, the storage controller needs to know what AZ pageservers are in. Related https://github.com/neondatabase/neon/issues/8848 ## Summary of changes This patch set adds a new nullable column to the `nodes` table: `availability_zone_id`. The node registration request is extended to include the AZ id (pageservers already have this in their `metadata.json` file). If the node is already registered, then we update the persistent and in-memory state with the provided AZ. Otherwise, we add the node with the AZ to begin with. A couple assumptions are made here: 1. Pageserver AZ ids are stable 2. AZ ids do not change over time Once all pageservers have a configured AZ, we can remove the optionals in the code and make the database column not nullable.