Clean comment cache after direct SQL queries

[David Biňovec]

Since WordPress 4.6, the comment cache group is persistent, thus after any INSERT, UPDATE, or DELETE direct SQL query touching the comments table, the clean_comment_cache function should be called.

Looks like it's not the case in Liveblog's WP CLI commands: https://github.com/Automattic/liveblog/blob/master/classes/class-wpcom-liveblog-wp-cli.php#L160

See https://make.wordpress.org/core/2016/07/18/comments-in-4-6-can-now-be-cached-by-a-persistent-object-cache/

[Paul Schreiber]

The updated version of liveblog uses posts instead of comments: https://github.com/paulschreiber/liveblog
which avoids this problem