"""db 子包 — MongoDB 文档模型 + 连接管理

子模块:
  models    — Book / BookDocument / DocumentFile helper class
  database  — MongoClient + collection + init_db
"""
from .models import Book, BookDocument, DocumentFile
from .database import (
    load_config, get_client, get_db, get_collection,
    init_db, health, next_id,
    COL_BOOK, COL_DOC, COL_FILE, COL_COUNTER,
)

__all__ = [
    'Book', 'BookDocument', 'DocumentFile',
    'load_config', 'get_client', 'get_db', 'get_collection',
    'init_db', 'health', 'next_id',
    'COL_BOOK', 'COL_DOC', 'COL_FILE', 'COL_COUNTER',
]