PingWatch 网络设备离线监控系统

- FastAPI 后端 + Vue 3 前端
- Docker Compose 一键部署
- Casdoor OAuth 认证集成
- LogHive 集中式日志
- 设备批量 CSV 导入/导出
- WebSocket 实时状态推送
- 企业微信告警通知
- fping 高性能并发 Ping 检测

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/app/core/deps.py

@@ -0,0 +1,28 @@
+"""数据库会话依赖"""
+
+from typing import AsyncGenerator
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from app.config import settings
+
+# 处理 sqlite 协议兼容
+db_url = settings.DATABASE_URL
+if db_url.startswith("sqlite"):
+    db_url = db_url.replace("sqlite://", "sqlite+aiosqlite://")
+
+engine = create_async_engine(db_url, echo=False, pool_pre_ping=True)
+async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+
+
+async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    async with async_session() as session:
+        try:
+            yield session
+        finally:
+            await session.close()
+
+
+async def init_db():
+    """创建所有表"""
+    from app.models.device import Base
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)