How to migrate Flask-Sqlalchemy Models from another folder and multiple files using flask-migrate - flask-sqlalchemy

Question

I'm new in flask. I'm using flask-sqlalchemy ORM, and want to migrate my models from another folder and multiple files using flask-migrate, but not able to migrate. This is my project structure.
Project Structure
Flask Project
├── config.py
├── migrations
├── API
│   ├── models
├── model1.py
├── model2.py
├── model3.py
├── resources
└── app.py
app.py
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] ="My_Database_Url"
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)
migrate = Migrate(app, db)
#app.route('/')
def hello():
return 'Hello, World!'
model1.py
from sqlalchemy.sql import func
from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()
class Student(db.Model):
id = db.Column(db.Integer, primary_key=True)
firstname = db.Column(db.String(100), nullable=False)
lastname = db.Column(db.String(100), nullable=False)
email = db.Column(db.String(80), unique=True, nullable=False)
age = db.Column(db.Integer)
created_at = db.Column(db.DateTime(timezone=True),
server_default=func.now())
bio = db.Column(db.Text)
def __repr__(self):
return f'<Student {self.firstname}>'
In CMD : running this command
flask db migrate
output
INFO [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO [alembic.runtime.migration] Will assume transactional DDL.
INFO [alembic.env] No changes in schema detected.