add

server/app/database.py

@@ -0,0 +1,24 @@
+"""MySQL 异步连接（SQLAlchemy 2.0 async）"""
+from collections.abc import AsyncGenerator
+
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+
+from app.config import settings
+
+engine = create_async_engine(
+    settings.database_url,
+    pool_size=20,
+    max_overflow=10,
+    pool_recycle=3600,
+    pool_pre_ping=True,
+    echo=False,
+)
+
+SessionFactory = async_sessionmaker(
+    engine, class_=AsyncSession, expire_on_commit=False, autoflush=False
+)
+
+
+async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    async with SessionFactory() as session:
+        yield session