Apologise to a client for an outage

昨晚 21:00–22:30 因为一次数据库迁移失败，客户 Globex 的订单系统无法访问约 90 分钟。现已恢复，没有数据丢失。请给客户写一封事故说明邮件：道歉、说明原因与影响、已采取的措施和后续预防。

• 1Apologise sincerely without over-apologising
• 2Explain what happened and the impact
• 3Describe the fix and prevention steps
• 4Offer a follow-up (call / report)