Auto-resume email and folder watchers on server startup

Added instrumentation.ts that reads persisted watcher state from the
database and restarts active watchers when the Next.js server boots.
Also added imapflow/mailparser to serverExternalPackages.

Made-with: Cursor

next.config.ts

@@ -14,7 +14,7 @@ const nextConfig: NextConfig = {
       },
     ],
   },
-  serverExternalPackages: ["sharp", "pdf2pic", "chokidar", "pg"],
+  serverExternalPackages: ["sharp", "pdf2pic", "chokidar", "pg", "imapflow", "mailparser"],
 };
 
 export default nextConfig;

src/instrumentation.ts

@@ -0,0 +1,54 @@
+export async function register() {
+  // Only run on the Node.js server runtime, not during build or in the edge runtime
+  if (process.env.NEXT_RUNTIME !== "nodejs") return;
+
+  const { prisma } = await import("@/lib/db");
+
+  let settings;
+  try {
+    settings = await prisma.appSettings.findUnique({
+      where: { id: "singleton" },
+    });
+  } catch (err) {
+    console.error("[instrumentation] Could not read settings:", err);
+    return;
+  }
+
+  if (!settings) return;
+
+  // Resume email monitoring
+  if (
+    settings.emailWatching &&
+    settings.emailImapHost &&
+    settings.emailImapUser &&
+    settings.emailImapPass
+  ) {
+    try {
+      const { startEmailWatching } = await import("@/lib/email-watcher");
+      await startEmailWatching({
+        host: settings.emailImapHost,
+        port: settings.emailImapPort,
+        user: settings.emailImapUser,
+        pass: settings.emailImapPass,
+        tls: settings.emailImapTls,
+        folder: settings.emailFolder,
+        processedAction: settings.emailProcessed,
+        processedFolder: settings.emailProcessedFolder,
+      });
+      console.log("[instrumentation] Email monitoring resumed");
+    } catch (err) {
+      console.error("[instrumentation] Failed to resume email monitoring:", err);
+    }
+  }
+
+  // Resume folder watching
+  if (settings.watching && settings.watchDir) {
+    try {
+      const { startWatching } = await import("@/lib/watcher");
+      await startWatching(settings.watchDir);
+      console.log("[instrumentation] Folder watching resumed");
+    } catch (err) {
+      console.error("[instrumentation] Failed to resume folder watching:", err);
+    }
+  }
+}