feat: add functions

pkg/entity/persistence/vector.py

@@ -0,0 +1,14 @@
+from sqlalchemy import create_engine, Column, Integer, String, Text, DateTime, ForeignKey, LargeBinary
+from sqlalchemy.orm import declarative_base, sessionmaker, relationship
+from datetime import datetime
+import numpy as np # 用于处理从LargeBinary转换回来的embedding
+
+Base = declarative_base()
+
+class Vector(Base):
+    __tablename__ = 'vectors'
+    id = Column(Integer, primary_key=True, index=True)
+    chunk_id = Column(Integer, ForeignKey('chunks.id'), unique=True)
+    embedding = Column(LargeBinary) # Store embeddings as binary
+
+    chunk = relationship("Chunk", back_populates="vector")