# Data Factory Kestra / n8n Navigation Separation Design

## Status

Approved for implementation on 2026-08-18.

## Problem

The Data Factory navigation currently mixes two orchestration generations:

- `生产线管理` opens the external n8n console.
- `工作流管理` is an n8n-oriented page, but its second tab hosts the governed Kestra production-line deployment console.

This coupling makes the eventual n8n retirement risky because removing the n8n navigation or page can also remove the Kestra production deployment surface.

## Decision

Create three independent Data Factory navigation entries, in this order:

1. `数据生产线投产` — DataOps-governed Kestra deployment page.
2. `n8n 生产线管理（待下线）` — current external n8n console link.
3. `n8n 工作流管理（待下线）` — current internal n8n workflow list, execution records, and health page.
4. Existing entries such as `数据可观测与事故` continue after them.

The Kestra page will use a new internal route, `/dataFactory/production-line-deployment`, and a dedicated page component. The existing `/dataFactory/workflow` route remains the legacy n8n page and no longer imports or renders the Kestra deployment component.

## Alternatives Considered

### A. Separate routes and pages — selected

This gives Kestra and n8n independent lifecycle boundaries. Removing n8n later requires deleting only the two legacy menu entries and legacy page/API adapters.

### B. Keep a combined tab page

Rejected because it preserves the current coupling and makes n8n retirement depend on editing the Kestra entry page.

### C. Link only to the native Kestra console

Rejected because the native console does not replace DataOps-owned RBAC, release readiness, canary evidence, activation gates, rollback, and audit presentation.

## Components

### Kestra production-line page

- New route: `/dataFactory/production-line-deployment`.
- New navigation label: `数据生产线投产`.
- Renders the existing `ProductionLineDeployment` component without an n8n wrapper.
- Keeps the existing DataOps deployment APIs and permissions (`dataflows:deploy`, `dataflows:canary`, `dataflows:activate`, and `dataflows:rollback`).
- Does not embed or redirect to the native Kestra console.

### Legacy n8n workflow page

- Existing route: `/dataFactory/workflow`.
- Renamed navigation label: `n8n 工作流管理（待下线）`.
- Keeps only `工作流列表`, `执行记录`, and `健康检查` tabs.
- Continues to use the existing n8n adapter APIs until retirement.

### Legacy n8n production-line link

- Existing external `VUE_APP_N8N_URL` behavior remains unchanged.
- Renamed navigation label: `n8n 生产线管理（待下线）`.
- Remains independently removable.

## Data Flow

The new Kestra menu page preserves the existing governed path:

`released DataFlow -> DataOps deployment API -> Kestra compiler -> disabled deployment -> canary -> activation/rollback -> evidence`

The n8n pages continue to use their existing n8n-specific adapters. No shared page component will own both orchestration engines.

## Error and Gate Behaviour

- Missing Kestra configuration continues to show the current fail-closed readiness warning.
- Empty deployments continue to explain that a production line must first be released.
- UAT activation remains disabled when the server-owned activation gate is closed.
- n8n availability errors remain confined to the legacy n8n page and link.

## Compatibility

- Existing backend APIs and database schema do not change.
- Existing Kestra deployment component behavior does not change.
- Existing deep link `/dataFactory/workflow` remains valid for n8n users.
- A new deep link is added for Kestra production deployment.
- Browser refresh and permission filtering must continue to work for both internal routes.

## Test Plan

Tests will first fail against the current coupled structure, then verify:

1. The router exposes the three independent navigation entries with unambiguous labels.
2. The Kestra route renders only the production deployment component.
3. The n8n workflow page no longer imports or renders `ProductionLineDeployment`.
4. The n8n workflow page retains its three legacy tabs.
5. Existing data-rule frontend contracts continue to validate the Kestra deployment UI.
6. Source and deployment frontend copies remain byte-identical where the release contract requires mirrors.
7. Frontend lint/build and focused Python contract suites pass.

## Retirement Boundary

When n8n retirement is approved, removal is limited to:

- the two navigation entries marked `（待下线）`;
- `/dataFactory/workflow` and its n8n-only components;
- the n8n frontend/backend adapters after migration evidence confirms no consumers.

The Kestra route, page, deployment APIs, and governed release data remain unaffected.