Design db schema in correct way for parent child kind of requirement
This is an impressive ERD. Are you sure you want to have every table inherit from CreatedAtAbstractBase?

The tables CarTypePanelPrice and CarModelPanelPrice are almost the same, differing only by car_model identifier. I would have the car_model field be optional (NULLable) and merge both tables. You'll know if one record is one type or the other if that field is NULL or NOT NULL. The orders/bookings seem alright.