An address's ETH balance is now null until a refresh has read it. That covers a new address, a new wallet, addresses a wallet scan finds, and every address after a network switch. Its line reads `quantity unknown`, Home's balance `unknown (ETH)`, and Send `Current balance: unknown (ETH)`. Max says the balance is unknown. Send is no longer refused as zero. The address has no total, and DeleteAddress warns that it may hold a balance. A refresh also deletes `balanceNotFetched` only when it read every address in the stored record. Model: opus-5-5