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Reboots are actually fine as ephemeral data will persist through a reboot on an EC2 instance. Your question is still valid though in case of halting and how you deal with it is specific to your application, but you have to be able to handle all the data on that ephemeral disk disappearing without warning.

One way in the case of a database could be a second EC2 instance configured as a read replica in a different AZ.

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Back when we ran the Citus cluster on EBS, we lost some EBS volumes as well. This manifested as disk not responding, followed several days later by an email from AWS with the subject Your Amazon EBS Volume vol-123456789abcdef telling you the disk was lost irrecoverably.

But yeah, you need to be ready for your disks to go away no matter where they are: ephemeral, EBS, physical, whatever.

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