Growing _archive_blog / _numeric tables

I have noticed that the database is building new tables ( matomo_archive_blog and matomo_archive_numeric) for each month of the year. What is it for? Can it be avoided? This way my database will become unsustainable, I believe.
Please anyone clarify this. Thank you.

hello anyone, please advice on this unresolved matter. My database is currently 250 rows and growing. It doesn’t look nice to have folders for every months.