Add a Five-Minute Cron Schedule
Registers an "every_five_minutes" interval that your own scheduled events can use with wp_schedule_event().
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Developer snippets for WordPress
Snippets for developers: debugging helpers, custom cron schedules, body classes, REST API tweaks and admin tools for checking hooks and queries. Building blocks for people who write code for WordPress every day.
Scheduled Cron Events Viewer
Adds a Tools > Cron Events screen listing every scheduled WP-Cron event with its next run time, recurrence and hook name, to debug missed or duplicate tasks.