Hydrant using large amounts of memory during backfill

Hydrant is using 37+ gigs of RAM when I'm trying to backfill, causing OOM. I assume this is unexpected.

My settings (running it in Docker):

      HYDRANT_DATABASE_PATH: /data/hydrant.db
      HYDRANT_EPHEMERAL: "true"
      HYDRANT_EPHEMERAL_TTL: "60min"
      HYDRANT_FULL_NETWORK: "true"