I recommend readera. It is a non ugly app with can sync to Google drive which prevents you from losing your ebooks when you delete them which can also happen by accident. I can't describe how other apps on Android is so ugly.
I think a audited algorithm where each type is strictly defined like int32 added to that really help with what exactly should be inputted to it so it remains correct.
They can do this with certificate transparency other wise CA can sign whatever date they want. But if they collude with CT that can issue rouge certificates for targeted attacks.
It's more like rds but it has far better developer experience than rds with dashboards and better migration. Their unique offering is their metal offering which uses local SSD for superior performance https://planetscale.com/metal