feat: add models for physical files, policies, and user management

- Implement PhysicalFile model to manage physical file references and reference counting.
- Create Policy model with associated options and group links for storage policies.
- Introduce Redeem and Report models for handling redeem codes and reports.
- Add Settings model for site configuration and user settings management.
- Develop Share model for sharing objects with unique codes and associated metadata.
- Implement SourceLink model for managing download links associated with objects.
- Create StoragePack model for managing user storage packages.
- Add Tag model for user-defined tags with manual and automatic types.
- Implement Task model for managing background tasks with status tracking.
- Develop User model with comprehensive user management features including authentication.
- Introduce UserAuthn model for managing WebAuthn credentials.
- Create WebDAV model for managing WebDAV accounts associated with users.

sqlmodels/database.py

@@ -0,0 +1,33 @@
+from sqlmodel import SQLModel
+from sqlalchemy.ext.asyncio import AsyncEngine, create_async_engine
+from sqlmodel.ext.asyncio.session import AsyncSession
+from utils.conf import appmeta
+from sqlalchemy.orm import sessionmaker
+from typing import AsyncGenerator
+
+ASYNC_DATABASE_URL = appmeta.database_url
+
+engine: AsyncEngine = create_async_engine(
+    ASYNC_DATABASE_URL,
+    echo=appmeta.debug,
+    connect_args={
+        "check_same_thread": False
+    } if ASYNC_DATABASE_URL.startswith("sqlite") else {},
+    future=True,
+    # pool_size=POOL_SIZE,
+    # max_overflow=64,
+)
+
+_async_session_factory = sessionmaker(engine, class_=AsyncSession)
+
+async def get_session() -> AsyncGenerator[AsyncSession, None]:
+    async with _async_session_factory() as session:
+        yield session
+
+async def init_db(
+    url: str = ASYNC_DATABASE_URL
+):
+    """创建数据库结构"""
+    async with engine.begin() as conn:
+        await conn.run_sync(SQLModel.metadata.create_all)
+