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from sqlalchemy import create_engine, Column, String, Integer, Text, DateTime, ForeignKey, Index
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
from datetime import datetime
import uuid
import os
from pathlib import Path
from dotenv import load_dotenv
# Load environment variables
env_path = Path(__file__).parent / '.env'
load_dotenv(dotenv_path=env_path)
DATABASE_URL = os.getenv("DATABASE_URL")
# Create engine
engine = create_engine(DATABASE_URL, pool_pre_ping=True)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()
# Models
class Session(Base):
__tablename__ = "sessions"
id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
user_id = Column(String, nullable=False, index=True)
name = Column(String, nullable=False)
created_at = Column(DateTime, default=datetime.utcnow)
messages = relationship("Message", back_populates="session", cascade="all, delete-orphan")
class Message(Base):
__tablename__ = "messages"
id = Column(Integer, primary_key=True, autoincrement=True)
session_id = Column(String, ForeignKey("sessions.id"), nullable=False)
role = Column(String, nullable=False)
content = Column(Text, nullable=False)
created_at = Column(DateTime, default=datetime.utcnow)
session = relationship("Session", back_populates="messages")
# Database functions
def init_db():
"""Create all tables"""
Base.metadata.create_all(bind=engine)
def get_db():
"""Get database session"""
db = SessionLocal()
try:
return db
finally:
pass
def create_session(user_id: str, name: str = "New Chat"):
"""Create a new chat session"""
db = SessionLocal()
try:
new_session = Session(
id=str(uuid.uuid4()),
user_id=user_id,
name=name
)
db.add(new_session)
db.commit()
db.refresh(new_session)
return {
"id": new_session.id,
"user_id": new_session.user_id,
"name": new_session.name,
"created_at": new_session.created_at.isoformat() if new_session.created_at else None
}
finally:
db.close()
def get_sessions(user_id: str):
"""Get all sessions for a user"""
db = SessionLocal()
try:
sessions = db.query(Session).filter(Session.user_id == user_id).order_by(Session.created_at.desc()).all()
return [
{
"id": s.id,
"user_id": s.user_id,
"name": s.name,
"created_at": s.created_at.isoformat() if s.created_at else None
}
for s in sessions
]
finally:
db.close()
def add_message(session_id: str, role: str, content: str):
"""Add a message to a session"""
db = SessionLocal()
try:
message = Message(
session_id=session_id,
role=role,
content=content
)
db.add(message)
db.commit()
finally:
db.close()
def get_messages(session_id: str):
"""Get all messages for a session"""
db = SessionLocal()
try:
messages = db.query(Message).filter(Message.session_id == session_id).order_by(Message.created_at.asc()).all()
return [
{
"id": m.id,
"session_id": m.session_id,
"role": m.role,
"content": m.content,
"created_at": m.created_at.isoformat() if m.created_at else None
}
for m in messages
]
finally:
db.close()
def delete_session(session_id: str):
"""Delete a session and all its messages"""
db = SessionLocal()
try:
session = db.query(Session).filter(Session.id == session_id).first()
if session:
db.delete(session)
db.commit()
finally:
db.close()
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