Fix blocklist-import bantime, unify filter bar, and improve config navigation

backend/tests/test_services/test_config_service.py

@@ -256,6 +256,27 @@ class TestUpdateJailConfig:
         assert "bantime" in keys
         assert "maxretry" in keys
 
+    async def test_ignores_backend_field(self) -> None:
+        """update_jail_config does not send a set command for backend."""
+        sent_commands: list[list[Any]] = []
+
+        async def _send(command: list[Any]) -> Any:
+            sent_commands.append(command)
+            return (0, "OK")
+
+        class _FakeClient:
+            def __init__(self, **_kw: Any) -> None:
+                self.send = AsyncMock(side_effect=_send)
+
+        from app.models.config import JailConfigUpdate
+
+        update = JailConfigUpdate(backend="polling")
+        with patch("app.services.config_service.Fail2BanClient", _FakeClient):
+            await config_service.update_jail_config(_SOCKET, "sshd", update)
+
+        keys = [cmd[2] for cmd in sent_commands if len(cmd) >= 3 and cmd[0] == "set"]
+        assert "backend" not in keys
+
     async def test_raises_validation_error_on_bad_regex(self) -> None:
         """update_jail_config raises ConfigValidationError for invalid regex."""
         from app.models.config import JailConfigUpdate