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| Requirement | Detail | |-------------|--------| | | Adding isHot flag must not increase API latency > 30 ms. Use a Redis‑backed hot‑status cache refreshed every 5 min. | | Scalability | System must support up to 10 M concurrent hot‑status checks per day. | | Reliability | If hot‑status service is down, fallback to “no badge” – do not break the page. | | Accessibility | Badge must have aria-label="Hot video" and be perceivable via screen readers. | | Internationalization | “Hot” badge text should be translatable (e.g., “热门” for Chinese). Provide i18n keys. |

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