app/models.py

from . import db
from datetime import datetime

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    password = db.Column(db.String(128), nullable=False)
    role = db.Column(db.String(20), default="viewer")

class Ad(db.Model):
    id = db.Column(db.UUID, primary_key=True)
    content = db.Column(db.Text)
    sentiment = db.Column(db.JSON)
    ad_metadata = db.Column(db.JSON)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    versions = db.relationship('AdVersion', backref='ad')

class AdVersion(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    ad_id = db.Column(db.UUID, db.ForeignKey('ad.id'))
    content = db.Column(db.Text)
    timestamp = db.Column(db.DateTime, default=datetime.utcnow)