I guess you could just proxy a normal SQLite DB? Should take only a few lines of PHP. Maybe just one: echo DB::select($_GET['query']); All that is needed

I guess you could just proxy a normal SQLite DB? Should take only a few lines of PHP. Maybe just one: echo DB::select($_GET['query']); All that is needed is a VM in the cloud. A VM with 10 GB is just $4/month these days. And you can add a 100 GB volume for just $10/month.