Read the official Contao announcements.
Contao core database table relations
Andreas Schempp made the effort and created an overview which presents all the fields and key identifiers of the Contao database tables. As I thought that this would probably also be interesting for some extension programmers, I would not want to deprive you of the summary.
Update: There was a mistake in the old overview, so here's the new one.
Back to the news overview.