How do I properly model a ratings table? - sqlalchemy

Question

I have some stories that need to be reviewed by certain users given different criteria. I'm a bit torn how to model the ratings table given that there are three foreign keys here: story_id, user_id and rating_criterion_id.
class Story(db.Model):
__tablename__ = 'stories'
id = db.Column(db.Integer, primary_key=True, index = True)
story_hash = db.Column(db.String(256), index = True)
creation_date = db.Column(db.DateTime(), default=datetime.now)
modification_date = db.Column(db.DateTime(), default=datetime.now,onupdate=datetime.now)
content = db.Column(db.String())
def __repr__(self):
return f"Story {self.id}: {self.story_hash}"
class RatingCriterion(db.Model):
__tablename__ = 'rating_criteria'
id = db.Column(db.Integer, primary_key=True, index = True)
name = db.Column(db.String(256), index = True)
de_alias = db.Column(db.String(256))
en_alias = db.Column(db.String(256))
tooltip = db.Column(db.String())
evaluation_key_id = db.Column(db.Integer, db.ForeignKey('evaluation_keys.id'), index = True) # there's a foreign key to the evaluation key here
def __repr__(self):
return f"RatingCriterion {self.id}: {self.name}"
class Rating(db.Model):
__tablename__ = 'ratings'
id = db.Column(db.Integer, primary_key=True, index = True)
user_id = db.Column(db.Integer, db.ForeignKey('user.id'), index = True) #there's also a foreign key here to a Users table.
story_id = db.Column(db.Integer, db.ForeignKey('stories.id'), index = True)
rating_criterion_id = db.Column(db.Integer, db.ForeignKey('rating_criteria.id'), index = True)
value = db.Column(db.Float())
My concern with this is that if I save ratings based on this model, there will be several rows pertaining to a rating per criterion. I would then need to pivot this table on user and story so that I get the rating values with the rating criteria as columns. Is there a better way of doing this?