chore(chat-agent): set up dev app for Vercel deployment with Atlas pooling

chat-agent/dev/.env.example

@@ -0,0 +1,13 @@
+# MongoDB connection string. Local dev defaults to
+# mongodb://localhost:27017/chat-agent-dev when unset. For Vercel deployments
+# point this at a MongoDB Atlas cluster (SRV URI).
+DATABASE_URI=mongodb://127.0.0.1/chat-agent-dev
+
+# Secret used to sign Payload tokens. Generate with `openssl rand -hex 32`.
+PAYLOAD_SECRET=YOUR_SECRET_HERE
+
+# Provider keys for the chat agent. Only the providers you actually use need
+# to be set — resolveModel in payload.config.ts will throw a clear error if a
+# selected model references a missing key.
+ANTHROPIC_API_KEY=
+OPENAI_API_KEY=

chat-agent/dev/package.json

@@ -23,6 +23,7 @@
     "@payloadcms/next": "^3.83.0",
     "@payloadcms/richtext-lexical": "^3.83.0",
     "@payloadcms/ui": "^3.83.0",
+    "@vercel/functions": "^3.1.5",
     "ai": "^6.0.164",
     "next": "15.4.11",
     "payload": "^3.83.0",

chat-agent/dev/src/payload.config.ts

@@ -16,6 +16,7 @@ import {
   UnorderedListFeature,
   UploadFeature,
 } from '@payloadcms/richtext-lexical'
+import { attachDatabasePool } from '@vercel/functions'
 import path from 'path'
 import { buildConfig } from 'payload'
 import { fileURLToPath } from 'url'
@@ -321,6 +322,20 @@ export default buildConfig({
   ],
   db: mongooseAdapter({
     url: process.env.DATABASE_URI || 'mongodb://localhost:27017/chat-agent-dev',
+    connectOptions: {
+      // Close sockets quickly so Fluid Compute can drain the pool between
+      // invocations instead of keeping idle Atlas connections open.
+      maxIdleTimeMS: 5_000,
+      maxPoolSize: 10,
+    },
+    // On Vercel Fluid Compute, hand the underlying MongoClient to
+    // @vercel/functions so idle connections are released when the function
+    // suspends. Guarded by VERCEL so local dev/tests aren't affected.
+    afterOpenConnection: (adapter) => {
+      if (process.env.VERCEL) {
+        attachDatabasePool(adapter.connection.getClient())
+      }
+    },
   }),
   editor: lexicalEditor(),
   endpoints: rootEndpoints,

chat-agent/dev/vercel.json

@@ -0,0 +1,12 @@
+{
+  "$schema": "https://openapi.vercel.sh/vercel.json",
+  "framework": "nextjs",
+  "installCommand": "cd .. && pnpm install --frozen-lockfile",
+  "buildCommand": "pnpm build",
+  "outputDirectory": ".next",
+  "functions": {
+    "src/app/(payload)/api/[...slug]/route.ts": {
+      "maxDuration": 300
+    }
+  }
+}