"However," Elena continued, seeing Marcus's slight frown, "the brute force solution is often acceptable in TestDome for this specific question unless the time limit is extremely strict. But if I were implementing this for a production system with high throughput..."
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// Step 3: Inject via constructor class AlertService private final AlertDAO storage; " Elena continued
: Verify that negative amounts are rejected and that balances update correctly after transactions. seeing Marcus's slight frown