Hints do not work with imported Base

There are no hints in PyCharm for models, which inherit declarative base from another module.
Here is example:

```python
# base.py
import re

from sqlalchemy import Column, Integer, DateTime
from sqlalchemy.ext.declarative import declared_attr
from sqlalchemy.sql import func
from sqlalchemy.ext.declarative import declarative_base

class Base:
@declared_attr
def __tablename__(cls):
return cls.__name__.lower()

id = Column(Integer, primary_key=True, index=True)
created_at = Column(DateTime(timezone=True), nullable=False, server_default=func.now())

Base = declarative_base(cls=Base)
```

```python
# models.py
from base import Base
from sqlalchemy import Integer, String, Column

class SomeModel(Base):
id = Column(Integer, primary_key=True)
name = Column(String)
description = Column(String)
```