refactor: 后端从Node.js重写为Python FastAPI

server/app/database.py

@@ -0,0 +1,36 @@
+"""
+数据库连接
+"""
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
+from sqlalchemy.orm import sessionmaker, declarative_base
+from app.config import get_settings
+
+settings = get_settings()
+
+# 创建异步引擎
+engine = create_async_engine(
+    settings.database_url,
+    echo=settings.debug,
+    pool_pre_ping=True,
+    pool_size=10,
+    max_overflow=20
+)
+
+# 创建异步会话
+AsyncSessionLocal = sessionmaker(
+    bind=engine,
+    class_=AsyncSession,
+    expire_on_commit=False
+)
+
+# 基类
+Base = declarative_base()
+
+
+async def get_db():
+    """获取数据库会话"""
+    async with AsyncSessionLocal() as session:
+        try:
+            yield session
+        finally:
+            await session.close()