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from sqlalchemy import create_engine, Column, String, Text, ForeignKey, DateTime
from sqlalchemy.orm import sessionmaker, declarative_base, relationship
from datetime import datetime
# Database Configuration
DATABASE_URL = "sqlite:///./chats.db"
engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()
class User(Base):
__tablename__ = "users"
id = Column(String, primary_key=True, unique=True, nullable=False)
email = Column(String, unique=True, nullable=False)
name = Column(String, nullable=False)
chats = relationship("Chat", back_populates="user", cascade="all, delete-orphan")
class Chat(Base):
__tablename__ = "chats"
chat_id = Column(String, primary_key=True, unique=True, nullable=False)
user_id = Column(String, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
title = Column(String, nullable=False)
timestamp = Column(DateTime, default=datetime.utcnow, nullable=False)
messages = relationship("ChatMessage", back_populates="chat", cascade="all, delete-orphan")
documents = relationship("Document", back_populates="chat", cascade="all, delete-orphan")
user = relationship("User", back_populates="chats")
class ChatMessage(Base):
__tablename__ = "chat_messages"
id = Column(String, primary_key=True, unique=True, nullable=False)
chat_id = Column(String, ForeignKey("chats.chat_id", ondelete="CASCADE"), nullable=False)
type = Column(String, nullable=False) # 'user' or 'assistant'
content = Column(Text, nullable=False)
timestamp = Column(DateTime, default=datetime.utcnow, nullable=False)
referenced_docs = Column(Text, nullable=True) # JSON string of referenced documents
chat = relationship("Chat", back_populates="messages")
class Document(Base):
__tablename__ = "documents"
id = Column(String, primary_key=True, unique=True, nullable=False)
chat_id = Column(String, ForeignKey("chats.chat_id", ondelete="CASCADE"), nullable=False)
name = Column(String, nullable=False)
content = Column(Text, nullable=False)
timestamp = Column(DateTime, default=datetime.utcnow, nullable=False)
chat = relationship("Chat", back_populates="documents")
Base.metadata.create_all(bind=engine)
def get_db():
db = SessionLocal()
try:
yield db
finally:
db.close()
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