The Daemon garbage collect runs a query like this:
SELECT * FROM table WHERE dateCreated < X ORDER BY id DESC LIMIT 100
On a huge table, this can't use either the `<dateCreated>` or `<id>` keys efficiently. Changing it to `ORDER BY dateCreated DESC, id DESC` should improve things.
In the cluster, an instance imported the linux kernel, then we ran into trouble 7 days later when GC started.