bbolt storage backend and file size

[ciencia]

I have Anubis configured to use the bbolt storage backend. I did a quick check on the folder containing the bbolt database, and I was surprised it was taking 2.2 GB:

~: ls -lh storage/
total 2.2G
-rw------- 1 232072 231072 2.2G Sep  7 17:53 anubis.bdb

Thankfully I don't have problems with space. However, maintaining a 2.2GB file may be challenging in terms of performance if it needs to be read/written often. I have some questions:

1. It has grown that size for about a month. Is it supposed to grow unconstrained until it fills the entire disk?
2. If it's expected to grow without a limit, should I periodically delete the file to reclaim its space? It would be good if noted in the docs