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In this commit, the graph SQL migration is updated so that the node migration step is retry-safe. This is done by using migration specific logic & queries that do not use the same node-update-constraint as the normal node upsert logic. For normal "run-time" logic, we always expect a node update to have a newer timestamp than any previously stored one. But for the migration, we will only ever be dealing with a single announcement for a given node & to make things retry-safe, we dont want the query to error if we re-insert the exact same node.