fastapi | FastAPI framework, high performance | REST library

this is my database schema.

I defined my Schema like this:

from pydantic import BaseModel

class Userattribute(BaseModel):
    name: str
    value: str
    user_id: str
    id: str

This is my model:

class Userattribute(Base):
    __tablename__ = "user_attribute"

    name = Column(String)
    value = Column(String)
    user_id = Column(String)
    id = Column(String, primary_key=True, index=True)

In a crud.py I define a get_attributes method.

def get_attributes(db: Session, skip: int = 0, limit: int = 100):
    return db.query(models.Userattribute).offset(skip).limit(limit).all()

This is my GET endpoint:

@app.get("/attributes/", response_model=List[schemas.Userattribute])
def read_attributes(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
    users = crud.get_attributes(db, skip=skip, limit=limit)
    print(users)
    return users

The connection to the database seems to work, but a problem is the datatype:

pydantic.error_wrappers.ValidationError: 7 validation errors for Userattribute
response -> 0
  value is not a valid dict (type=type_error.dict)
response -> 1
  value is not a valid dict (type=type_error.dict)
response -> 2
  value is not a valid dict (type=type_error.dict)
response -> 3
  value is not a valid dict (type=type_error.dict)
response -> 4
  value is not a valid dict (type=type_error.dict)
response -> 5
  value is not a valid dict (type=type_error.dict)
response -> 6
  value is not a valid dict (type=type_error.dict)

Why does FASTApi expect a dictionary here? I don´t really understand it, since I am not able to even print the response. How can I fix this?