What state or records must be persisted in the database so that a later worker can determine whether a given email-sending job has already been sent or processed, as described in the BullMQ idempotent-jobs pattern?

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“What state or records must be persisted in the database so that a later worker can determine whether a given email-sending job has already been sent or processed, as described in the BullMQ idempotent-jobs pattern?”