免费的 Heroku Postgres 数据库的 4 小时停机时间是什么时候？
When is the 4-hour downtime for free Heroku Postgres databases?
Heroku Postgres 数据库的免费套餐有 "up to 4 hours of downtime per month"。我想我在展示应用程序时可能会 运行 进入停机时间，我正在努力避免将来出现此类问题。有什么办法可以查明这 4 小时的停机时间是什么时候？ （或者，更好的是，我可以安排在半夜进行吗？）
Is there any way to find out when those 4 hours of downtime will occur? (Or, even better, could I schedule them during the middle of the night?)
No:
- Expected uptime of 99.5% each month.
- Unannounced maintenance and database upgrades.
Heroku Postgres 数据库的免费套餐有 "up to 4 hours of downtime per month"。我想我在展示应用程序时可能会 运行 进入停机时间，我正在努力避免将来出现此类问题。有什么办法可以查明这 4 小时的停机时间是什么时候？ （或者，更好的是，我可以安排在半夜进行吗？）
Is there any way to find out when those 4 hours of downtime will occur? (Or, even better, could I schedule them during the middle of the night?)
No:
- Expected uptime of 99.5% each month.
- Unannounced maintenance and database upgrades.