flask show while calculating

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Here is an other post you can look at.
So here is doing scheduling on the Flask server with APScheduler.
Last in post also demo with DB flask_sqlalchemy(what you always should use DB connection in Flask).

Both of solution i posted here could work for what you doing.
Just write a result check eg if webshop2 is done: then ready to send to page.
The scheduling just work at interval you set,the if a webshop is finish on next scheduling time it will send to page,if not finish send nothing.