Earlier quoted context omitted.
Interesting. In Germany this database does not even exist. Each town keeps its own data and they are not connected. I think the reason for this are the evil uses of data bases by the Gestapo during Nazi times.
In Germany this database does not even exist. That seems highly doubtful. How do the EU countries know you're a citizen, then, when you cross the border?
They certainly don't look up in a database whether you are a citizen. Such an EU-wide thing simply doesn't exist. Heck, even the entry and exit records are not in a common database. At the moment many borders can't even verify the government signature saved on the chip.
That's the same how other government officials determine your German citizenship in most circumstances. Only very few people go through the process of getting definitive proof of their citizenship (Staatsangehörigenausweis) in any point of their life as there is simply no reason to. This process takes quite some time, often including looking at some non-digitized paper documents archived somewhere.