I vaguely recall this Eureka moment I had when I found some feature in Calibre or some plugin that allowed me to generate a bar graph from "Date" column, and it baffled me to see that every year around June was a time when there was a spike in the graph. I had never noticed I added so much more books to the library around that time of year.
Now I've just tried to see how to bring up that "bar graph", but couldn't find it.
