Automating a hard refresh or cache clearing?

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Hi folks! 

I run a flash sale website where we sell one item per day, and the deal switches over at 11pm sharp. Im moving it to shopify and found apps to schedule the items, but our current site forces a site update at 11pm.. whereas with shopify i have to manually do it. Customers are used to the deal switching at 11pm automatically, so i'd rather avoid communicating "at 11pm you have to refresh your page" - are any of yall familiar with an app that might handle this function? No luck searching the app store.