app/models.py

from app import db
from datetime import datetime

user_roles = db.Table('user_role',
    db.Column('user_id', db.Integer, db.ForeignKey('users.id')),
    db.Column('role_id', db.Integer, db.ForeignKey('role.id'))
)

class User(db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True)
    first_name = db.Column(db.String(150))
    last_name = db.Column(db.String(150))
    email = db.Column(db.String(255), unique=True, nullable=False)
    password = db.Column(db.String(255), nullable=False)
    roles = db.relationship('Role', secondary=user_roles, backref='users')

class Role(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50), unique=True, nullable=False)

class Question(db.Model):
    __tablename__ = 'questions'
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    content = db.Column(db.Text, nullable=False)
    date = db.Column(db.DateTime, default=datetime.utcnow)
    status = db.Column(db.String(20), default='pending')
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    user = db.relationship('User', backref=db.backref('questions', lazy=True))