# Import necessary modules
from flask_sqlalchemy import SQLAlchemy

# Create an instance of SQLAlchemy and assign it to db
db = SQLAlchemy()

# Define a User model class that inherits from db.Model
class table_user(db.Model):
    # Define the id column as an integer primary key
    id = db.Column(db.Integer, primary_key=True)
    # Define the user_name column as a string with max length 80 and must be unique and not nullable
    user_name = db.Column(db.String(80), unique=True, nullable=False)
    # Define the user_password column as a string with max length 120 and must be unique and not nullable
    user_password = db.Column(db.String(120), unique=True, nullable=False)
    # Define the user_email column as a string with max length 120 and must be unique and not nullable
    user_email = db.Column(db.String(120), unique=True, nullable=False)