fixes and improvements

backend/src/media_library_viewer_api/main.py

@@ -15,7 +15,8 @@ from media_library_viewer_api.config import get_settings
 from media_library_viewer_api.logging_utils import configure_logging, describe_settings
 from media_library_viewer_api.routers import dashboard, monitoring, media, files, jobs, users
 from media_library_viewer_api.routers.settings import router as settings_router
-from media_library_viewer_api.dependencies import get_mail_queue, get_monitoring_poller
+from media_library_viewer_api.dependencies import get_mail_queue, get_monitoring_poller, get_settings_store
+from media_library_viewer_api.services.known_hosts import ensure_known_hosts_for_machines
 
 logger = logging.getLogger(__name__)
 
@@ -27,6 +28,12 @@ async def lifespan(app: FastAPI):
     configure_logging(settings.log_level)
     validate_auth_settings(settings)
     logger.info("Backend startup complete: %s", describe_settings(settings))
+    store = get_settings_store()
+    try:
+        changed = ensure_known_hosts_for_machines(store.list_machines(), settings.ssh_known_hosts_file)
+        logger.info("Managed known_hosts updated entries=%s file=%s", changed, settings.ssh_known_hosts_file)
+    except Exception:
+        logger.exception("Failed to synthesize managed known_hosts file")
     mail_queue = get_mail_queue()
     monitoring_poller = get_monitoring_poller()
     mail_queue.start()