I love Lowdefy (I've seen it a couple week back here on HN) but I have dismissed it given that there's no SQL connector right now. It's great to hear that you're working on that!
We also implemented OpenID Connect support so you can "bring your own" auth service. Will be making a post again when these new features ship in the very near future.
Hope you give it a shot! And let us know if we can help!