diff --git a/src/app/api/health/route.ts b/src/app/api/health/route.ts
new file mode 100644
index 0000000..c02bbcb
--- /dev/null
+++ b/src/app/api/health/route.ts
@@ -0,0 +1,34 @@
+import { NextResponse } from "next/server";
+import { prisma } from "@/lib/db";
+import pkg from "../../../../package.json";
+
+export const dynamic = "force-dynamic";
+
+/**
+ * Healthcheck für Reverse-Proxy und Uptime-Monitoring.
+ * Prüft die Datenbankverbindung mit — eine App ohne DB ist nicht gesund.
+ */
+export async function GET() {
+  const startedAt = Date.now();
+  try {
+    await prisma.$queryRaw`SELECT 1`;
+    return NextResponse.json({
+      status: "ok",
+      version: pkg.version,
+      database: "ok",
+      latencyMs: Date.now() - startedAt,
+      timestamp: new Date().toISOString(),
+    });
+  } catch (error) {
+    return NextResponse.json(
+      {
+        status: "error",
+        version: pkg.version,
+        database: "unreachable",
+        message: error instanceof Error ? error.message : "unbekannter Fehler",
+        timestamp: new Date().toISOString(),
+      },
+      { status: 503 },
+    );
+  }
+}
diff --git a/tsconfig.json b/tsconfig.json
index 6d1b48c..67e276f 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,11 @@
 {
   "compilerOptions": {
     "target": "ES2022",
-    "lib": ["dom", "dom.iterable", "esnext"],
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
     "allowJs": true,
     "skipLibCheck": true,
     "strict": true,
@@ -11,14 +15,28 @@
     "moduleResolution": "bundler",
     "resolveJsonModule": true,
     "isolatedModules": true,
-    "jsx": "preserve",
+    "jsx": "react-jsx",
     "incremental": true,
     "noUncheckedIndexedAccess": true,
-    "plugins": [{ "name": "next" }],
+    "plugins": [
+      {
+        "name": "next"
+      }
+    ],
     "paths": {
-      "@/*": ["./src/*"]
+      "@/*": [
+        "./src/*"
+      ]
     }
   },
-  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
-  "exclude": ["node_modules"]
+  "include": [
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts",
+    ".next/dev/types/**/*.ts"
+  ],
+  "exclude": [
+    "node_modules"
+  ]
 }