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Cache flush resets cron_frequency for managed job entities

Overview

Steps to reproduce:

  1. Install cronplus v2.4.0
  2. Install any extension with a managed job entity (e.g. Civirules)
  3. Go to Administer >> System Settings >> Scheduled Jobs and change cron frequency for the job provided by that extension
  4. Run cache cleanup
  5. Check that cron frequency reverted to default

Background

Cache cleaning runs CRM_Core_ManagedEntities::reconcile() which updates managed entities. This later triggers cronplus_civicrm_postSave_civicrm_job() for every managed job.

Since !10 (merged) if a cron frequency is not present in $_POST - which only happens when we update cron frequency through the UI (as in step # 3 above) - it calculates the default cron frequency and overwrites the configured setting.