Reflecting a single table from another schema

[mmssix]

I'm sure this must be answered somewhere, but I'm utterly failing at coming up with a working solution.

I have a flask app that utilizes blueprints. There is a main models.py file with a Users class. The table for this ends up in the onea database.

I then have a blueprint called monitoring with its own schema (called "monitoring"...). One of the tables in the monitoring schema (MonitoringAssignedTo) has a foreign_key relationship with the Users table in the main schema.

I'm unsure as to how I'm supposed to import the Users class into monitoring so I can have that foreign key relationship across schemas. I'm assuming I have to use reflection, but I don't understand how.

app/models.py

class Users(UserMixin, AbstractBase):
    __tablename__ = 'app_users'
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), index=True, unique=True)
    email = db.Column(db.String(120), index=True, unique=True)
    first = db.Column(db.String(254))
    last = db.Column(db.String(254))

app/blueprints/monitoring/models.py

class MonitoringAssignedTo(db.Model):
    __bind_key__ = "monitoring"
    __tablename__ = "monitoring_assignedto"
    id = db.Column(db.Integer, primary_key=True)
    job_id = db.Column(db.Integer, db.ForeignKey('monitoring_jobs.id'), nullable=False, index=True,
                       comment='Foregin key to job table')
    assigned_to_id = db.Column(db.Integer, db.ForeignKey('app_users.id'), nullable=False, index=True,
                               comment='user table id for assigned to')
    assigned_to = db.relationship('Users', lazy='joined', foreign_keys=[assigned_to_id])

my config file:

    NAME = conf.get_config('onea', 'db_name', 'onea')
    USER = conf.get_config('onea', 'db_user', 'onea_user')
    PASSWORD = conf.get_config('onea', 'db_pass', 'password')
    HOST = conf.get_config('onea', 'db_host', '127.0.0.1')
    PORT = conf.get_config('onea', 'db_port', '3306')
    SQLALCHEMY_DATABASE_URI = f"{ENGINE}://{USER}:{PASSWORD}@{HOST}:{PORT}/{NAME}"
    SQLALCHEMY_BINDS = {
        "monitoring": {
            "url": f"{ENGINE}://{USER}:{PASSWORD}@{HOST}:{PORT}/monitoring",
            "pool_recycle": 3600,
            'pool_timeout': 900,
            'pool_size': 10,
            'max_overflow': 5,
            'isolation_level': "READ COMMITTED",
            'connect_args': {
                'connect_timeout': 10
            }
        },
    }