I found a textbook SQLi in the Eufy Security application.
Don’t mind the heavy use of red blocks to redact. The first, normal request. Everything looks fine. Notice the response time at 35 milliseconds.
The second request with a 10 second sleep payload. Notice the response time in the bottom right corner.
Was able to dump some info to confirm this was actually real.
It’s been reported and confirmed by Eufy.