system_log_ttl_config.xml

<clickhouse>
  <part_log>
    <ttl>event_date + INTERVAL 30 DAY DELETE</ttl>
  </part_log>
  <metric_log>
    <ttl>event_date + INTERVAL 30 DAY DELETE</ttl>
  </metric_log>
  <trace_log>
    <ttl>event_date + INTERVAL 30 DAY DELETE</ttl>
  </trace_log>
  <query_thread_log>
    <ttl>event_date + INTERVAL 30 DAY DELETE</ttl>
  </query_thread_log>
  <query_views_log>
    <ttl>event_date + INTERVAL 30 DAY DELETE</ttl>
  </query_views_log>
  <query_log>
    <ttl>event_date + INTERVAL 30 DAY DELETE</ttl>
  </query_log>
  <session_log>
    <ttl>event_date + INTERVAL 30 DAY DELETE</ttl>
  </session_log>
  <asynchronous_metric_log>
    <ttl>event_date + INTERVAL 30 DAY DELETE</ttl>
  </asynchronous_metric_log>
</clickhouse>