flowchart TB
    n1([開始])
    n2([結束])
    n3[&amp;&#35;39;\n數據存儲後端實現\n\n支持多種存儲後端：\n- SQLite: 輕量級，適合開發和...]
    n4[from abc import ABC, abstractmethod]
    n5[from datetime import datetime]
    n6[import json]
    n7[from pathlib import Path]
    n8[from typing import Any]
    n9[from sqlalchemy import create_engine, desc, func]
    n10[from sqlalchemy.orm import sessionmaker]
    n11[from .models import Base, ExperienceSampleModel, K...]
    n12[class StorageBackend&#40;...&#41;]
    n13[class SQLiteBackend&#40;...&#41;]
    n14[class PostgreSQLBackend&#40;...&#41;]
    n15[class JSONLBackend&#40;...&#41;]
    n16[class HybridBackend&#40;...&#41;]
    n1 --> n3
    n3 --> n4
    n4 --> n5
    n5 --> n6
    n6 --> n7
    n7 --> n8
    n8 --> n9
    n9 --> n10
    n10 --> n11
    n11 --> n12
    n12 --> n13
    n13 --> n14
    n14 --> n15
    n15 --> n16
    n16 --> n2