fix: faster sac-api restart (TimeoutStopSec, SSE cancel on shutdown)

backend/app/api/v1/stream.py

@@ -53,6 +53,7 @@ def _dashboard_snapshot(db: Session) -> dict:
 
 
 async def _sse_generator():
+    try:
         while True:
             db = SessionLocal()
             try:
@@ -61,6 +62,8 @@ async def _sse_generator():
                 db.close()
             yield f"data: {json.dumps(payload, ensure_ascii=False)}\n\n"
             await asyncio.sleep(SSE_INTERVAL_SEC)
+    except asyncio.CancelledError:
+        return
 
 
 def _sse_auth(token: str = Query(..., description="JWT access_token")) -> str:

deploy/systemd/sac-api.service

@@ -13,9 +13,11 @@ WorkingDirectory=/opt/security-alert-center/backend
 # Конфиг читает само приложение (pydantic), не systemd — иначе ломаются пароли с #, $ и т.д.
 Environment=SAC_CONFIG_FILE=/opt/security-alert-center/config/sac-api.env
 Environment=PYTHONPATH=/opt/security-alert-center/backend
-ExecStart=/opt/security-alert-center/backend/.venv/bin/uvicorn app.main:app --host 127.0.0.1 --port 8000
+ExecStart=/opt/security-alert-center/backend/.venv/bin/uvicorn app.main:app --host 127.0.0.1 --port 8000 --timeout-graceful-shutdown 10
 Restart=on-failure
 RestartSec=5
+TimeoutStopSec=20
+TimeoutStartSec=30
 NoNewPrivileges=true
 
 [Install]