Spaces:
Sleeping
Sleeping
File size: 2,595 Bytes
ba5110e 35aa68b ba5110e |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 |
"""
Database models and session management.
"""
import os
from datetime import datetime
from typing import Optional, List
from sqlalchemy import create_engine, Column, String, Text, DateTime, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
from sqlalchemy.orm import sessionmaker as async_sessionmaker
import uuid
DATABASE_URL = os.getenv("DATABASE_URL", "sqlite+aiosqlite:///./algebra_chat.db")
Base = declarative_base()
class Conversation(Base):
"""Conversation/Session model."""
__tablename__ = "conversations"
id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
title = Column(String(255), nullable=True)
created_at = Column(DateTime, default=datetime.utcnow)
updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
messages = relationship("Message", back_populates="conversation", cascade="all, delete-orphan")
class Message(Base):
"""Message model for chat history."""
__tablename__ = "messages"
id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
conversation_id = Column(String(36), ForeignKey("conversations.id"), nullable=False)
role = Column(String(20), nullable=False) # 'user' or 'assistant'
content = Column(Text, nullable=False)
image_data = Column(Text, nullable=True) # Base64 encoded image
created_at = Column(DateTime, default=datetime.utcnow)
conversation = relationship("Conversation", back_populates="messages")
# Async engine and session
engine = create_async_engine(DATABASE_URL, echo=False)
AsyncSessionLocal = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
async def init_db():
"""Initialize database tables."""
# Ensure database directory exists
if "sqlite" in DATABASE_URL:
db_path = DATABASE_URL.replace("sqlite+aiosqlite:///", "").replace("sqlite:///", "")
db_dir = os.path.dirname(db_path)
if db_dir and not os.path.exists(db_dir):
try:
os.makedirs(db_dir, exist_ok=True)
print(f"Created database directory: {db_dir}")
except Exception as e:
print(f"Error creating database directory {db_dir}: {e}")
async with engine.begin() as conn:
await conn.run_sync(Base.metadata.create_all)
async def get_db():
"""Get database session."""
async with AsyncSessionLocal() as session:
yield session
|