Archivist makes db swap
Accidentally, I discovered db.turris.cz has about 25GB of data in swap. This seemed to be (at last partially) caused by the archivist, which had a huge amount of memory allocated. This is suspicious, since it should only stream the data through and shouldn't allocate anything large.
It might be worth noting that this was running after a few days of downtime, so the data set to archive was significantly larger than usual, but it still shouldn't do this.