That looks nice as well

Yes, sometimes we are just missing the right term. Thanks.

Web based. Basically, I am looking for a general web app which is working with DB.

I am looking for abstraction layer to hide DB internals. I am not looking for a frontend for DB, but for a “web app” which is only the DB itself. Like I said, I am not even sure something like that exists.

I know they are doing it, it's not nice, but they can assign random seats if they want.

Well they could just pay to sit together. You either don't care where you sit, or you do and you will pay for that additional fee. I don't see anything wrong with that.