models.py

from datetime import datetime
from database import db

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    username = db.Column(db.String(80), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    
class Document(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    filename = db.Column(db.String(120), nullable=False)
    text = db.Column(db.Text, nullable=False)
    upload_time = db.Column(db.DateTime, default=datetime.utcnow)
    
class TranscriptionSession(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
    start_time = db.Column(db.DateTime, default=datetime.utcnow)
    end_time = db.Column(db.DateTime)
    status = db.Column(db.String(50), default='active')
    
    user = db.relationship('User', back_populates='transcription_sessions')

User.transcription_sessions = db.relationship('TranscriptionSession', 
                                              order_by=TranscriptionSession.id, 
                                              back_populates='user'
                                              )