Hi @jeri_k
While searching in Magento Core Code i found out that eav_entity table is mentioned in confix.xml and in DB setup you can check this in below path:
/app/core/code/Mage/Eav/etc/config.xml
But thing is they declared it but never used it may be the devs go with other approach.so that is the reason it's empty. the approach what dev is to define eav type and their respective table like for customer,order,sales etc. and use them directly.
For more information about this you can go through The purpose of 'eav_' tables here this can help you for better understanding.
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Problem Solved, Please Accept as Solution & give Kudos
Shubham Khandelwal