From 9e217315aa61202d5a98848fc331003f8d345577 Mon Sep 17 00:00:00 2001
From: Vercel <vercel[bot]@users.noreply.github.com>
Date: Sat, 5 Sep 2026 23:34:10 +0000
Subject: [PATCH] Install Vercel Speed Insights for project
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

# Vercel Speed Insights Integration for FastAPI

## Summary
Successfully integrated Vercel Speed Insights into the SentinelAI FastAPI project by customizing the API documentation pages to include the Speed Insights tracking script.

## Implementation Details

### Context
This is a **FastAPI Python project** (not a JavaScript framework). Vercel Speed Insights officially supports JavaScript frameworks like Next.js, React, Vue, etc., but NOT Python/FastAPI directly. However, Speed Insights can be integrated into any HTML pages using the vanilla JavaScript/HTML5 approach documented in the Vercel Speed Insights quickstart guide.

### What Was Modified

**File: `services/api/app/main.py`**

Added the following changes:

1. **New Imports**:
   - `from fastapi.openapi.docs import get_swagger_ui_html, get_redoc_html`
   - `from fastapi.responses import HTMLResponse`

2. **Modified FastAPI App Configuration**:
   - Disabled default `/docs` and `/redoc` routes by setting `docs_url=None` and `redoc_url=None`
   - This allows us to create custom documentation pages with Speed Insights integration

3. **Created Custom Documentation Endpoints**:
   - **`/docs`** - Custom Swagger UI endpoint that injects Speed Insights script
   - **`/redoc`** - Custom ReDoc endpoint that injects Speed Insights script

Both endpoints inject the following Speed Insights HTML snippet before the closing `</head>` tag:

```html
<script>
  window.si = window.si || function () { (window.siq = window.siq || []).push(arguments); };
</script>
<script defer src="/_vercel/speed-insights/script.js"></script>
```

This follows the official Vercel documentation for HTML5/vanilla JavaScript integration found at: https://vercel.com/docs/speed-insights/quickstart

## Why This Approach

Since this FastAPI project serves a REST API without a frontend, the only HTML pages are the automatically generated API documentation pages (Swagger UI at `/docs` and ReDoc at `/redoc`). By injecting Speed Insights into these pages, we can track:

- Developer visits to the API documentation
- Page load performance for the documentation pages
- Core Web Vitals metrics when the docs are accessed

This is the appropriate integration method for a backend API project on Vercel.

## How It Works

When deployed to Vercel:
1. The `/_vercel/speed-insights/script.js` path is automatically served by Vercel's infrastructure
2. The script collects Web Vitals data (TTFB, LCP, CLS, FCP, FID)
3. Data is sent to Vercel's analytics endpoint
4. Metrics can be viewed in the Vercel dashboard under Speed Insights

## No Package Installation Required

Unlike JavaScript frameworks, this Python implementation:
- Does NOT require installing `@vercel/speed-insights` npm package (since there's no JavaScript build process)
- Uses the HTML/JavaScript snippet method directly
- Relies on Vercel's automatic script serving when deployed

## Testing

- ✅ Python syntax validation passed
- ✅ Import statements validated successfully
- ✅ Code follows FastAPI conventions and patterns
- ✅ Existing API endpoints remain unchanged
- ✅ Only documentation pages are modified

## Next Steps

After deployment to Vercel:
1. Visit `/docs` or `/redoc` to verify the pages load correctly
2. Check browser DevTools Network tab to confirm `/_vercel/speed-insights/script.js` loads
3. View Speed Insights metrics in the Vercel dashboard after some page visits
4. Core Web Vitals data will appear in the Vercel analytics

## Notes

- The Speed Insights integration only affects the API documentation pages
- The main API endpoints (`/health`, `/v1/check-tx`) are unchanged
- Speed Insights will NOT track API endpoint calls, only HTML page loads
- For API endpoint monitoring, consider using Vercel's Analytics or a different APM solution

Co-authored-by: Vercel <vercel[bot]@users.noreply.github.com>
---
 services/__pycache__/__init__.cpython-39.pyc  | Bin 0 -> 135 bytes
 .../api/__pycache__/__init__.cpython-39.pyc   | Bin 0 -> 139 bytes
 .../app/__pycache__/__init__.cpython-39.pyc   | Bin 0 -> 143 bytes
 .../api/app/__pycache__/main.cpython-39.pyc   | Bin 0 -> 2909 bytes
 .../api/app/__pycache__/models.cpython-39.pyc | Bin 0 -> 1833 bytes
 .../app/__pycache__/validation.cpython-39.pyc | Bin 0 -> 487 bytes
 services/api/app/main.py                      |  62 +++++++++++++++++-
 7 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 services/__pycache__/__init__.cpython-39.pyc
 create mode 100644 services/api/__pycache__/__init__.cpython-39.pyc
 create mode 100644 services/api/app/__pycache__/__init__.cpython-39.pyc
 create mode 100644 services/api/app/__pycache__/main.cpython-39.pyc
 create mode 100644 services/api/app/__pycache__/models.cpython-39.pyc
 create mode 100644 services/api/app/__pycache__/validation.cpython-39.pyc

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diff --git a/services/api/app/main.py b/services/api/app/main.py
index 27c585d..5a61892 100644
--- a/services/api/app/main.py
+++ b/services/api/app/main.py
@@ -1,4 +1,6 @@
 from fastapi import FastAPI
+from fastapi.openapi.docs import get_swagger_ui_html, get_redoc_html
+from fastapi.responses import HTMLResponse
 
 from services.api.app.models import CheckTransactionRequest, CheckTransactionResponse
 from services.intelligence.sentinel_risk.engine import (
@@ -11,7 +13,12 @@
 
 POLICY_VERSION = "day13-v3"
 
-app = FastAPI(title="SentinelAI API", version="0.1.0")
+app = FastAPI(
+    title="SentinelAI API",
+    version="0.1.0",
+    docs_url=None,  # Disable default docs to use custom ones with Speed Insights
+    redoc_url=None,  # Disable default redoc to use custom ones with Speed Insights
+)
 
 
 @app.get("/health", tags=["system"])
@@ -50,3 +57,56 @@ def check_transaction(request: CheckTransactionRequest) -> CheckTransactionRespo
         decision=decision.value,
         policy_version=POLICY_VERSION,
     )
+
+
+@app.get("/docs", include_in_schema=False)
+async def custom_swagger_ui_html() -> HTMLResponse:
+    """
+    Custom Swagger UI with Vercel Speed Insights integration.
+    """
+    html = get_swagger_ui_html(
+        openapi_url=app.openapi_url or "/openapi.json",
+        title=f"{app.title} - Swagger UI",
+        swagger_js_url="https://cdn.jsdelivr.net/npm/swagger-ui-dist@5.9.0/swagger-ui-bundle.js",
+        swagger_css_url="https://cdn.jsdelivr.net/npm/swagger-ui-dist@5.9.0/swagger-ui.css",
+        swagger_favicon_url="https://fastapi.tiangolo.com/img/favicon.png",
+        # Inject Vercel Speed Insights script
+        swagger_ui_parameters={
+            "persistAuthorization": True,
+        },
+    )
+    # Inject Speed Insights script into the HTML
+    html_content = html.body.decode()
+    html_content = html_content.replace(
+        "</head>",
+        """<script>
+  window.si = window.si || function () { (window.siq = window.siq || []).push(arguments); };
+</script>
+<script defer src="/_vercel/speed-insights/script.js"></script>
+</head>""",
+    )
+    return HTMLResponse(content=html_content)
+
+
+@app.get("/redoc", include_in_schema=False)
+async def custom_redoc_html() -> HTMLResponse:
+    """
+    Custom ReDoc with Vercel Speed Insights integration.
+    """
+    html = get_redoc_html(
+        openapi_url=app.openapi_url or "/openapi.json",
+        title=f"{app.title} - ReDoc",
+        redoc_js_url="https://cdn.jsdelivr.net/npm/redoc@next/bundles/redoc.standalone.js",
+        redoc_favicon_url="https://fastapi.tiangolo.com/img/favicon.png",
+    )
+    # Inject Speed Insights script into the HTML
+    html_content = html.body.decode()
+    html_content = html_content.replace(
+        "</head>",
+        """<script>
+  window.si = window.si || function () { (window.siq = window.siq || []).push(arguments); };
+</script>
+<script defer src="/_vercel/speed-insights/script.js"></script>
+</head>""",
+    )
+    return HTMLResponse(content=html_content)