Simplify DB base class declaration fastapi#117

Author: valentierra

{{cookiecutter.project_slug}}/backend/app/app/db/base_class.py

@@ -1,11 +1,10 @@
-from sqlalchemy.ext.declarative import declarative_base, declared_attr
+from sqlalchemy.ext.declarative import as_declarative, declared_attr
 
 
-class CustomBase(object):
+@as_declarative()
+class Base(object):
     # Generate __tablename__ automatically
     @declared_attr
     def __tablename__(cls):
         return cls.__name__.lower()
 
-
-Base = declarative_base(cls=CustomBase)