allow setting the default partial execution flow with an env variable

PARTIAL_EXECUTION_VERSION_DEFAULT can be 0 or 1

packages/cli/src/config/schema.ts

@@ -792,4 +792,13 @@ export const schema = {
 		env: 'N8N_PROXY_HOPS',
 		doc: 'Number of reverse-proxies n8n is running behind',
 	},
+
+	featureFlags: {
+		partialExecutionVersionDefault: {
+			format: String,
+			default: '0',
+			env: 'PARTIAL_EXECUTION_VERSION_DEFAULT',
+			doc: 'Set this to 1 to enable the new partial execution logic by default.',
+		},
+	},
 };

packages/cli/src/workflows/workflows.controller.ts

@@ -406,7 +406,9 @@ export class WorkflowsController {
 			req.body,
 			req.user,
 			req.headers['push-ref'] as string,
-			req.query.partialExecutionVersion,
+			req.query.partialExecutionVersion === '-1'
+				? config.getEnv('featureFlags.partialExecutionVersionDefault')
+				: req.query.partialExecutionVersion,
 		);
 	}
 

packages/editor-ui/src/stores/workflows.store.ts

@@ -102,7 +102,10 @@ let cachedWorkflow: Workflow | null = null;
 
 export const useWorkflowsStore = defineStore(STORES.WORKFLOWS, () => {
 	const uiStore = useUIStore();
-	const partialExecutionVersion = useLocalStorage('PartialExecution.version', 0);
+	// -1 means the backend chooses the default
+	// 0 is the old flow
+	// 1 is the new flow
+	const partialExecutionVersion = useLocalStorage('PartialExecution.version', -1);
 
 	const workflow = ref<IWorkflowDb>(createEmptyWorkflow());
 	const usedCredentials = ref<Record<string, IUsedCredential>>({});