feat: harden migration flows and integration coverage

backend/tests/plugins/test_migration_plugin.py

@@ -850,4 +850,71 @@ class TestMigrationPluginExecute:
             call_args = mock_sync.sync_environment.call_args
             assert call_args[1]["incremental"] is True
 
+    # ── Isolation: one import failure does not abort batch ──
+
+    @pytest.mark.asyncio
+    async def test_execute_import_failure_continues_batch(self):
+        """One dashboard import raises SupersetAPIError; second still migrates."""
+        from src.core.utils.network import SupersetAPIError
+
+        plugin = MigrationPlugin()
+        src_env = _make_env("env-1", "Source")
+        tgt_env = _make_env("env-2", "Target")
+        dashboards = [
+            _make_dashboard(1, "Working"),
+            _make_dashboard(2, "Broken Import"),
+        ]
+
+        mock_cm = MagicMock()
+        mock_cm.get_environments.return_value = [src_env, tgt_env]
+
+        mock_src_client = _make_mock_superset_client()
+        mock_src_client.get_dashboards = AsyncMock(return_value=(True, dashboards))
+        mock_src_client.export_dashboard = AsyncMock(return_value=(b"zip", "meta"))
+        mock_tgt_client = _make_mock_superset_client()
+        mock_tgt_client.import_dashboard = AsyncMock(
+            side_effect=[
+                None,
+                SupersetAPIError(
+                    "API error during upload: Dataset boom",
+                    status_code=422,
+                    response_body='{"errors":[{"message":"Dataset boom","error_type":"GENERIC_COMMAND_ERROR","extra":{"issue_codes":[{"code":1010}]}}]}',
+                    errors=[{
+                        "message": "Dataset boom",
+                        "error_type": "GENERIC_COMMAND_ERROR",
+                        "extra": {"issue_codes": [{"code": 1010}]},
+                    }],
+                ),
+            ]
+        )
+
+        mock_engine = MagicMock()
+        mock_engine.transform_zip.return_value = True
+
+        with patch('src.plugins.migration.get_config_manager', return_value=mock_cm), \
+             patch('src.plugins.migration.SupersetClient') as MockSC, \
+             patch('src.plugins.migration.MigrationEngine', return_value=mock_engine), \
+             patch('src.plugins.migration.create_temp_file') as mock_ctf, \
+             patch('src.plugins.migration.IdMappingService', return_value=_make_mock_mapping_service()), \
+             patch('src.plugins.migration.SessionLocal'):
+
+            MockSC.side_effect = [mock_src_client, mock_tgt_client]
+            mock_ctf.return_value.__enter__ = MagicMock(return_value="/tmp/test.zip")
+
+            result = await plugin.execute({
+                "source_env_id": "env-1",
+                "target_env_id": "env-2",
+                "selected_ids": [1, 2],
+            })
+
+            assert result["status"] == "PARTIAL_SUCCESS"
+            assert len(result["migrated_dashboards"]) == 1
+            assert result["migrated_dashboards"][0]["title"] == "Working"
+            assert len(result["failed_dashboards"]) == 1
+            failed = result["failed_dashboards"][0]
+            assert failed["title"] == "Broken Import"
+            assert "Dataset boom" in failed["error"]
+            assert failed.get("error_type") == "GENERIC_COMMAND_ERROR"
+            assert 1010 in (failed.get("issue_codes") or [])
+
 # #endregion Test.MigrationPlugin