Hey @LotusBlack 
Would you mind trying with forest-express-sequelize@7.9.4 ? We’ve just release a fix for this issue which looks pretty similar to yours. I’ve been able to reproduce the problem detailled there and this version should hopefully fix your issue as well.
I will take a look at the woodshop example you mentionned, just to be sure the sample code is still valid for v7.
(BTW, your models/index.js looks perfectly fine to me 
)
Let me know if that’s the case or not 