Always happy to contribute to #opensource projects I use by myself:
https://github.com/rrd4j/rrd4j/pulls?q=is%3Apr+is%3Aclosed+author%3AToparvion ☺️

This time fixed a couple of issues in wonderful #RRD4J library - the most comprehensive implementation of round-robin database in #Java.

#rrd stores data in a way that prevents the storage from unlimited growth what makes it perfect for aggregated #timeseries.
Read more if interested: https://en.wikipedia.org/wiki/RRDtool