Fri, 28 Apr 2017 17:17:23 +0200 wenzelm clarified database layout;
Fri, 28 Apr 2017 16:52:07 +0200 wenzelm allow null for primitive types;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 tip