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File size: 2,376 Bytes
b378103 | 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 73 74 75 76 77 78 79 80 81 82 83 84 | from sqlalchemy import (
create_engine,
Column,
Integer,
String,
DateTime,
Text,
ForeignKey,
)
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
from datetime import datetime
import os
Base = declarative_base()
class Document(Base):
__tablename__ = "documents"
id = Column(Integer, primary_key=True)
doc_name = Column(String(255), nullable=False)
created_at = Column(DateTime, default=datetime.utcnow)
versions = relationship(
"DocumentVersion", back_populates="document", cascade="all, delete-orphan"
)
def __repr__(self):
return f"<Document(id={self.id}, name='{self.doc_name}')>"
class DocumentVersion(Base):
__tablename__ = "document_versions"
id = Column(Integer, primary_key=True)
document_id = Column(Integer, ForeignKey("documents.id"), nullable=False)
version_number = Column(Integer, nullable=False)
file_path = Column(String(512), nullable=False)
upload_date = Column(DateTime, default=datetime.utcnow)
file_hash = Column(String(64))
doc_metadata = Column(Text)
document = relationship("Document", back_populates="versions")
chunks = relationship(
"DocumentChunk", back_populates="version", cascade="all, delete-orphan"
)
def __repr__(self):
return f"<DocumentVersion(doc_id={self.document_id}, v{self.version_number})>"
class DocumentChunk(Base):
__tablename__ = "document_chunks"
id = Column(Integer, primary_key=True)
version_id = Column(Integer, ForeignKey("document_versions.id"), nullable=False)
chunk_index = Column(Integer, nullable=False)
content = Column(Text, nullable=False)
faiss_index = Column(Integer)
version = relationship("DocumentVersion", back_populates="chunks")
def __repr__(self):
return f"<DocumentChunk(id={self.id}, chunk_index={self.chunk_index})>"
def init_db(database_url: str = None):
if database_url is None:
database_url = os.getenv("DATABASE_URL", "sqlite:///./rag_system.db")
engine = create_engine(database_url, echo=False)
Base.metadata.create_all(engine)
SessionLocal = sessionmaker(bind=engine)
return engine, SessionLocal
def get_db_session(database_url: str = None):
_, SessionLocal = init_db(database_url)
return SessionLocal()
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