database.py

from sqlalchemy import create_engine, Column, Integer, String, Text, DateTime
from sqlalchemy.orm import declarative_base, sessionmaker
from datetime import datetime

Base = declarative_base()

class ChatMessage(Base):
    __tablename__ = "chat_messages"
    id = Column(Integer, primary_key=True, index=True)
    session_id = Column(String, index=True)
    role = Column(String)
    message = Column(Text)
    timestamp = Column(DateTime, default=datetime.utcnow)

# SQLite engine and session
engine = create_engine("sqlite:///./chat_history.db", connect_args={"check_same_thread": False})
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Create tables
Base.metadata.create_all(bind=engine)