Nextcloud oc_filecache growing huge : too many rows (hence backup fails with : lost connection to MySQL)

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Related to : Nextcloud upgrade: how to shrink oc_filecache.ibd (441GB at the moment), same issue as you @wbk
(and maybe Le cron.php de nextcloud pompe toutes les ressources - #2 by tierce Something hammering MySQL (5M/s disk writes)?)