diff --git a/scripts/build-timeseries-files.ts b/scripts/build-timeseries-files.ts
index fb0a80fc..7884c066 100644
--- a/scripts/build-timeseries-files.ts
+++ b/scripts/build-timeseries-files.ts
@@ -52,6 +52,10 @@ type TimeseriesIndex = {
       summary?: unknown;
     }
   >;
+  schema: {
+    version: number;
+    generatedAt: string;
+  };
 };
 
 const ROOT = process.cwd();
@@ -260,6 +264,10 @@ async function main() {
   const out: TimeseriesIndex = {
     byPathway,
     byDataset,
+    schema: {
+      version: 1,
+      generatedAt: new Date().toISOString(),
+    },
   };
 
   // -------------------------------
diff --git a/src/data/index.gen.ts b/src/data/index.gen.ts
index 02dd55b7..e8fec65b 100644
--- a/src/data/index.gen.ts
+++ b/src/data/index.gen.ts
@@ -50,5 +50,9 @@ export const index: TimeseriesIndex = {
       path: "/data/asean-centre-for-energy/BAS-2024_timeseries.csv",
     },
   },
+  schema: {
+    version: 1,
+    generatedAt: "2025-11-05T14:23:08.770Z",
+  },
 } as const;
 export default index;
diff --git a/tsconfig.node.json b/tsconfig.node.json
index 4c78e2b0..8a38451b 100644
--- a/tsconfig.node.json
+++ b/tsconfig.node.json
@@ -16,6 +16,7 @@
     "vitest.config.ts",
     "postcss.config.ts",
     "tailwind.config.ts",
-    "src/utils/*.ts"
+    "src/utils/*.ts",
+    "src/data/index.gen.ts"
   ]
 }