feat(engine): serve DELETE /v1/nodes/:name on the self-host engine

[anshuman83-40]

Addresses #353.

openapi.yaml and relay.nodes.delete() have documented DELETE /v1/nodes/:name since #380, but only relaycast-cloud implements it. The open-source engine returns 404, so on a self-hosted deployment node rows still can't be removed. This PR adds the route to the engine and follows the published contract exactly, so no SDK or OpenAPI change is needed.

Behavior

• The :name parameter is matched as an exact node id first, then as a name.
• Without force=true, the request is refused with 409 in two cases:
  • node_online: the node is live. This includes a heartbeat timestamped in the future (possible clock skew) and a node socket connected to this isolate.
  • node_has_actions: the node hosts registered actions.
• The same guards are part of the DELETE statement's WHERE clause. If a heartbeat or action registration lands between the checks and the delete, the delete removes nothing and the route returns node_delete_conflict instead of dropping newly live state. A single statement is used because runAtomic is not isolated on D1.
• force=true deletes the node regardless and reports how many actions went with it in cascaded_actions.
• On success the route returns 200 { id, name, deleted: true, cascaded_actions }.
• Bindings, providers and hosted actions are removed by the existing ON DELETE CASCADE foreign keys. Agent, delivery and invocation references to the node are cleared by the existing SET NULL foreign keys.
• The route needs the workspace key and runs under serializeNodeOp, the same as provider removal.

A force-deleted live node's socket is not closed. Its next frame fails node-token auth because the row no longer exists. The registry has no disconnect method, and adding one is out of scope here.

Tests

The new file src/__tests__/conformance/nodeDelete.test.ts covers:

• delete by name, and the node leaving the roster
• an exact id taking precedence over a name
• a lapsed heartbeat while the status column still reads online
• bindings cascading and the agent's location being cleared
• 404 for an unknown node
• rejection without the workspace key
• node_online, then a forced delete
• a heartbeat skewed into the future
• node_has_actions, then a forced delete with cascaded_actions: 2

Results:

• npm run typecheck (engine) passes.
• eslint passes on the changed files.
• nodeDelete, node and nodeProviders conformance: 135/135 pass.
• Full engine suite on Windows / Node 22.22.3: 8 tests fail, and they fail identically on unmodified main.
  • atomicity.test.ts "session event status effect": duplicate column name: status_updated_at
  • files.test.ts storage-failure test

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Note

Medium Risk
Touches node lifecycle, agent location, and in-flight action invocations with concurrency guards; mistakes could strand work or delete live nodes without force checks.

Overview
Self-hosted engines now implement DELETE /v1/nodes/:name, matching the OpenAPI/SDK contract that previously only worked on relaycast-cloud, so relay.nodes.delete() can prune dead nodes instead of getting 404.

The route resolves id before name, requires a workspace key, and runs under serializeNodeOp. Without force=true, deletes are rejected with 409 (node_online, node_has_actions) when the node is live or hosts actions; guarded atomic deletes return node_delete_conflict if state changes mid-flight. force=true removes the node and hosted actions and reports cascaded_actions.

The new deleteNode engine path takes online nodes offline via the same claim/settle flow as connection loss, then atomically fails open invocations with node_deleted, marks located agents offline, deletes hosted actions, and removes the node row. emitFailedInvocationEffects is exported from action.ts so callers can emit action.failed after those failures. Docs and changelogs are updated; conformance tests cover auth, force, races, and cascade behavior.

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⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 969922c5-0720-43ee-bbe6-a8ca8dee7c00

📥 Commits

Reviewing files that changed from the base of the PR and between 92e5aa2 and 8cf8837.

📒 Files selected for processing: 7

• CHANGELOG.md
• README.md
• packages/engine/CHANGELOG.md
• packages/engine/src/__tests__/conformance/nodeDelete.test.ts
• packages/engine/src/engine/action.ts
• packages/engine/src/engine/node.ts
• packages/engine/src/routes/node.ts

📝 Walkthrough

The engine adds node deletion by ID or name, with safeguards for online nodes and nodes hosting actions. A workspace-key-protected route exposes deletion, including forced deletion and conflict responses. Tests and documentation describe the endpoint.

Changes: Node deletion

Layer / File(s)	Summary
Deletion rules and database updates packages/engine/src/engine/node.ts	Adds deleteNode and its result type. The engine checks node liveness and hosted actions unless deletion is forced, and reports conflicts or cascaded action counts.
Route, validation, and documentation packages/engine/src/routes/node.ts, packages/engine/src/__tests__/conformance/nodeDelete.test.ts, README.md, CHANGELOG.md, packages/engine/CHANGELOG.md	Adds the authenticated DELETE route and HTTP responses. Conformance tests cover lookup, authorization, liveness, cleanup, and forced deletion. Documentation describes the endpoint and its behavior.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature · Severity of issue fixed: Low

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant NodeRoute
  participant NodeControlOperations
  participant deleteNode
  participant Database
  Client->>NodeRoute: DELETE /v1/nodes/:name
  NodeRoute->>NodeControlOperations: Serialize deletion
  NodeControlOperations->>deleteNode: Pass target, force flag, and connection state
  deleteNode->>Database: Look up node and conditionally delete
  Database-->>deleteNode: Return deletion result
  deleteNode-->>NodeRoute: Return success, conflict, or not-found result
  NodeRoute-->>Client: Return HTTP status and response

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Suggested reviewers: willwashburn

Merge Risk: 🔵 Low · up to 92e5a

Correct the force-delete description so operators do not mistake deletion for disconnection. The documented behavior is the remaining merge concern.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 3 files. (3 skipped: 3…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely identifies the main change: adding DELETE /v1/nodes/:name to the self-host engine.
Description check		The description directly explains the self-host engine endpoint, deletion behavior, safeguards, tests, and validation results.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 3 files. (3 skipped: 3 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

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_{A rabbit taps the delete route with care,
A name or ID finds the node there.
If actions live or heartbeats glow,
The engine guards the way below.
Force can clear the hosted ties,
Then action counts return as replies.}

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Actionable comments posted: 1

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Inline comments:
Review comments at @README.md:
- Line 1231: Update the DELETE /v1/nodes/:name description in the README to say
that force=true deletes an online node and its hosted actions; do not imply it
disconnects or detaches the live node.

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📥 Commits

Reviewing files that changed from the base of the PR and between 7fe4f09 and 92e5aa2.

📒 Files selected for processing: 6

• CHANGELOG.md
• README.md
• packages/engine/CHANGELOG.md
• packages/engine/src/__tests__/conformance/nodeDelete.test.ts
• packages/engine/src/engine/node.ts
• packages/engine/src/routes/node.ts

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[greptile-apps]

Confidence Score: 5/5

[Critical impact] The PR appears safe to merge; no new actionable issue remains.

Summary

The engine now serves DELETE /v1/nodes/:name for self-hosted deployments.

• Self-hosted callers can delete nodes by id or name.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[DELETE node] --> B[Require workspace key]
  B --> C[Resolve ID before name]
  C --> D[Serialize operations for node]
  D --> E{Force requested?}
  E -- No --> F[Check heartbeat, socket, and hosted actions]
  F --> G[Keep checks on every write]
  E -- Yes --> H[Match resolved node]
  G --> I[Atomic write group]
  H --> I
  I --> J[Fail stranded invocations]
  J --> K[Take remaining hosted agents offline]
  K --> L[Delete actions and node]
  L --> M[Emit failure events and return count]

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