I have the following models:

```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    archived = db.Column(db.Boolean, default=False)

class Post(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    content = db.Column(db.UnicodeText, nullable=True)

    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False, index=True)
    user = db.relationship(
        'User',
        backref='posts',
        foreign_keys='Post.user_id',
    )

```

How can I add a filter to `Post` on the `user` relationship column to filter out archived users? I want to avoid changing the relationship type to `lazy='dynamic'`, much rather do it in the model here