I'm not sure if this is the right place to ask , but is this erd valid? Or is it unacceptable? Thank you for any help.

Looks okay on first glance. Hard to tell without the requirements though. Next time please just attach the image, most people won't download a zip file.

Thank you for the advice and for taking the time to help me out! Much appreciated!
I will keep the attachment advice in mind too, sorry for the inconvenience : )

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