Home-assistant_v2.db-shm ? home-assistant_v2.db-wal?

I am trying to reduce the size of my .db file and have the following in my config.yaml

  purge_interval: 2
  purge_keep_days: 2
      - sensor.date_time
      - sensor.icloud3_event_log
      - sensor.doug-*
      - sensor.doug_*
      - device_tracker.doug_*
      - switch.*
      - sun.*
      - media_player.*

I deleted all the home-assistant_V2…db files and restarted. I now have 3 .db files

From other posts, these are apparently temporary files…what worries me is that both files have just one entry:

'utf-8' codec can't decode byte 0xe2 in position 1: invalid continuation byte

While this doesn’t appear to be effecting anything, I’m not happy seeing error messages without understanding why I should ignore them.

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