From ; https://community.home-assistant.io/t/how-to-keep-your-recorder-database-size-under-control/295795

SELECT
  COUNT(*) as cnt,
  SUM(LENGTH(event_data)) as bytes,
  event_type
FROM events
GROUP BY event_type
ORDER BY cnt DESC

and

SELECT
  COUNT(*) AS cnt,
  COUNT(*) * 100 / (SELECT COUNT(*) FROM states) AS cnt_pct,
  SUM(LENGTH(attributes)) AS bytes,
  SUM(LENGTH(attributes)) * 100 / (SELECT SUM(LENGTH(attributes))  FROM states) AS bytes_pct,
  entity_id
FROM states
GROUP BY entity_id
ORDER BY cnt DESC

Delete enitities records;

DELETE FROM states where entity_id IN ('sensor.temperature' , 'sensor.battery_temperature' , 'sensor.28_63e8d4122101_temperature', 'sensor.battery_voltage');

Backup the database;

sudo rm -f /volume2/cctv/backups/1_backup.db
sudo sqlite3 /volume3/sudo sqlite3 /volume3/docker-storage/home-assistant/config/home-assistant_v2.db ".backup /volume2/cctv/backups/1_backup.db"/home-assistant/config/home-assistant_v2.db ".backup /volume2/cctv/backups/1_backup.db"