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Align TTL for CAA records
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Description

$ grep CAA /var/db/knot/nasqueron.org.zone
nasqueron.org. 300 IN CAA 0 issue letsencrypt.org
nasqueron.org. 172800 IN CAA 0 issuewild letsencrypt.org

Recommandation from https://www.digicert.com/faq/dns/what-is-ttl is 1800-3600.

The 1800 could be coherent with the 300 former choice for Let's Encrypt.