How will database errors be handled when and if they occur?
Nice I am really happy to hear you guys have thought about all of this, this is awesome, look forward to seeing this when you build a UI around it also...DB errors, like any PHP error as well, throw exceptions. They can be caught if the code needs it (to ignore errors, for example). If they aren't caught, they propagate up to the nice "server error" error handler, which a few people have seen That error handler automatically logs the error with line and backtrace info, as well as the URL, user, and GET/POST info in it. I already used it to track down a few errors today.
There's no interface for it yet though, so I'm using straight MySQL.