HA DB size started to grow faster... How to fix?

I don’t know what has happened but I’ve noticed that about 5 days ago, HA DB started to grow at the rate of about 400-500MB per day.

Before that growth was there, but considerably slower. Now DB is >2.5GB and continues growing.

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Where do I check what makes DB to grow and how do I stop it?

Separate, but related question - how do I clean up other old data? Now it is 15GB used and from there DB is 2.5GB. I want to remove old, unrelated data, logs, etc.

Thanks