chore(self-hosting): add health check endpoint

[PlaneInABottle]

Summary

• add a lightweight GET /api/health endpoint for deployment platforms and container probes
• return a simple ok payload with an ISO timestamp so self-hosted runtimes have a stable readiness target
• cover the route with a focused Vitest spec

Validation

• bun --cwd apps/sim vitest run app/api/health/route.test.ts
• bunx @biomejs/biome check apps/sim/app/api/health/route.ts apps/sim/app/api/health/route.test.ts

[cursor]

PR Summary

Low Risk
Adds a simple, read-only health endpoint and a small unit test; low impact with minimal integration surface.

Overview
Adds a lightweight GET /api/health route that returns { status: 'ok', timestamp: <ISO string> } with HTTP 200 for probe/readiness checks.

Includes a focused Vitest spec (route.test.ts) that calls GET() directly and asserts the response status and payload shape.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Mar 13, 2026 9:01am

[greptile-apps]

Greptile Summary

This PR adds a lightweight GET /api/health endpoint intended for deployment platforms and container liveness/readiness probes. It returns { status: "ok", timestamp: "<ISO string>" } with HTTP 200 and is covered by a single Vitest spec that validates both the status code and the response shape.

• New apps/sim/app/api/health/route.ts: uses the native Response.json() API (idiomatic for Next.js App Router), the explicit { status: 200 } option is redundant but harmless and improves readability.
• New apps/sim/app/api/health/route.test.ts: correct @vitest-environment node directive, uses the @/ path alias correctly, and asserts both the HTTP status and the JSON body shape.
• The endpoint is unauthenticated by design (health probes must be publicly reachable), which is appropriate.
• No database or dependency checks are performed — this is a pure liveness signal, which is a reasonable starting point for self-hosting.

Confidence Score: 5/5

• This PR is safe to merge — it adds two new files with no modifications to existing code.
• The change is entirely additive (two new files), the implementation is minimal and correct, the endpoint is appropriately unauthenticated for a health probe, and the test covers the expected behaviour. No existing functionality is touched.
• No files require special attention.

Important Files Changed

Filename	Overview
apps/sim/app/api/health/route.ts	New GET handler returning { status: 'ok', timestamp } with HTTP 200; clean, minimal, no issues.
apps/sim/app/api/health/route.test.ts	Focused Vitest spec validating status code and response shape; uses correct @/ alias and @vitest-environment node directive.

Sequence Diagram

sequenceDiagram
    participant Probe as Deployment Probe / Load Balancer
    participant Next as Next.js App Router
    participant Handler as GET /api/health

    Probe->>Next: GET /api/health
    Next->>Handler: route handler invoked
    Handler-->>Next: Response.json({ status: "ok", timestamp })
    Next-->>Probe: HTTP 200 { status: "ok", timestamp: "<ISO 8601>" }

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_{Last reviewed commit: 0c00560}