Earlier quoted context omitted.
They certainly don't look up in a database whether you are a citizen. OK, "citizen or valid resident / visa holder / having some other legitimate reason to be holding something that looks like an EU identity card", then. Whichever -- I was just simplifying. But something tells me that something at major border crossings (e.g. hub airports) has to at least authenticate your right-of-entry -- and that your travel docum…
I can assure you that they do not check for positive entry in any database when crossing into Schengen whatsoever. Usually they check if the presented document is marked stolen but even that is sometimes skipped as the database (SIS II) is rather slow. This database contains around 50 million entries which shows that it can't possible hold information on all residents. There is neither an EU-wide database of citizens…
Just wondering. Thanks for the cool info.