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: Verify that your local firewall allows uninterrupted outbound traffic for SQL Delta to prevent dropped server heartbeats.

Activation keys as control tokens An activation key is a logical token that authorizes or triggers a change’s application. In databases, activation keys can be metadata attached to delta batches indicating when or whether to apply them (for example, staged schema migrations, feature-flagged data transformations, or controlled replica catches-ups). Activation keys can encode policy (who can apply a delta, under what conditions, or in which phase) and serve as an auditable handle for operators.