How to disable pi-hole DNS filtering for a specific user programmatically?

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Activate group with cron

Hello, I'm looking for a way to activate a group from 9 a.m. to 6 p.m. and have it deactivated from 6:01 p.m. to 8:59 a.m. with school at home I want to block social media during school hours. Thank you in advance for your help.