They don't make a secret of it: https://blog.cloudflare.com/log-analytics-using-clickhouse/ https://blog.cloudflare.com/log-analytics-using-clickhouse/ Clickho

They don't make a secret of it: https://blog.cloudflare.com/log-analytics-using-clickhouse/ https://blog.cloudflare.com/log-analytics-using-clickhouse/ Clickhouse is great, but like any database if you run it at scale someone must tend to it.