diff --git a/.gitignore b/.gitignore
index e42e641e..ae22cc79 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@
 **/__sapper__
 **/.rpt2_cache
 **/build
+/web/data
diff --git a/web/package-lock.json b/web/package-lock.json
index 80c346c8..2478300e 100644
--- a/web/package-lock.json
+++ b/web/package-lock.json
@@ -1659,6 +1659,11 @@
       "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
       "dev": true
     },
+    "atomically": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/atomically/-/atomically-1.7.0.tgz",
+      "integrity": "sha512-Xcz9l0z7y9yQ9rdDaxlmaI4uJHf/T8g9hOEzJcsEqX2SjCj4J20uK7+ldkDHMbpJDK76wF7xEIgxc/vSlsfw5w=="
+    },
     "aws-sign2": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
diff --git a/web/package.json b/web/package.json
index f57085ad..78dfb962 100644
--- a/web/package.json
+++ b/web/package.json
@@ -42,7 +42,8 @@
     "elementtree": "^0.1.7",
     "express": "^4.17.1",
     "node-fetch": "^2.6.1",
-    "sirv": "^1.0.0"
+    "sirv": "^1.0.0",
+    "atomically": "1.7.0"
   },
   "browserslist": [
     "last 3 chrome versions",
diff --git a/web/src/routes/data/currency.json.ts b/web/src/currency.ts
similarity index 87%
rename from web/src/routes/data/currency.json.ts
rename to web/src/currency.ts
index 9cce31e5..4d4d0a3e 100644
--- a/web/src/routes/data/currency.json.ts
+++ b/web/src/currency.ts
@@ -1,7 +1,8 @@
-import cached from "./_cached";
 import { Def } from "util/defs";
 import fetch from "node-fetch";
 import { parse } from "elementtree";
+import { writeFile } from "atomically";
+import { mkdir } from "fs/promises";
 
 async function btc() {
   interface Format {
@@ -104,10 +105,17 @@ async function ecb() {
   return defs;
 }
 
-export const get = cached(3600 * 1000, async () => {
-  const [btcDefs, ecbDefs] = await Promise.all([btc(), ecb()]);
+const DATA_DIR = process.env.DATA_DIR || "data";
+export const currencyPath = `${DATA_DIR}/currency.json`;
 
+export async function updateCurrency() {
+  const [btcDefs, ecbDefs] = await Promise.all([btc(), ecb()]);
   const defs: Def[] = [...btcDefs, ...ecbDefs];
 
-  return defs;
-});
+  await mkdir(DATA_DIR, { recursive: true });
+
+  await writeFile(currencyPath, JSON.stringify(defs, undefined, "\t"), {
+    encoding: "utf8",
+  });
+  console.log("Successfully updated file.");
+}
diff --git a/web/src/routes/data/_cached.ts b/web/src/routes/data/_cached.ts
deleted file mode 100644
index 468d5a42..00000000
--- a/web/src/routes/data/_cached.ts
+++ /dev/null
@@ -1,49 +0,0 @@
-import { Request, Response as ExpressResponse } from "express";
-import createEtag from "etag";
-
-interface CachedValue {
-  status: number;
-  time: Date;
-  etag: string;
-  body: string;
-}
-
-export default function cached(
-  cacheTimeMs: number,
-  target: () => Promise<unknown>
-) {
-  let cache: CachedValue | null = null;
-  return async (req: Request, res: ExpressResponse) => {
-    if (!cache || cache.time.getTime() - new Date().getTime() > cacheTimeMs) {
-      try {
-        const value = await target();
-        const body = JSON.stringify(value);
-        const time = new Date();
-        const etag = createEtag(body);
-        cache = { status: 200, body, etag, time };
-      } catch (err) {
-        console.log("Error updating cached resource:", err);
-        const time = new Date();
-        const body = JSON.stringify({
-          code: err.code,
-          message: err.toString(),
-          date: time.toISOString(),
-        });
-        const etag = createEtag(body);
-        cache = {
-          status: 503,
-          body,
-          etag,
-          time,
-        };
-      }
-    }
-
-    res.status(cache.status).set({
-      ETag: cache.etag,
-      "Content-Type": "application/json",
-      "Last-Modified": cache.time.toUTCString(),
-    });
-    res.send(cache.body);
-  };
-}
diff --git a/web/src/server.js b/web/src/server.js
index abd8185c..ff615dbb 100644
--- a/web/src/server.js
+++ b/web/src/server.js
@@ -4,23 +4,43 @@ import sirv from "sirv";
 import express from "express";
 import compression from "compression";
 import * as sapper from "@sapper/server";
+import { updateCurrency, currencyPath } from "./currency.ts";
+import { existsSync } from "fs";
 
 const { PORT, NODE_ENV } = process.env;
 const dev = NODE_ENV === "development";
 
-express()
-  .use(
-    compression({ threshold: 0 }),
-    sirv("static", { dev }),
-    sapper.middleware()
-  )
-  .listen(PORT, (err) => {
-    if (err) console.log("error", err);
-  });
+async function batchJob() {
+  await updateCurrency();
+  process.exit(0);
+}
+
+async function main() {
+  if (!existsSync(currencyPath)) {
+    await updateCurrency();
+  }
+
+  express()
+    .use("data", sirv(".", { dev }))
+    .use(
+      compression({ threshold: 0 }),
+      sirv("static", { dev }),
+      sapper.middleware()
+    )
+    .listen(PORT, (err) => {
+      if (err) console.log("error", err);
+    });
 
-async function loadRink() {
-  let rink = await wasm();
-  Rink.setRink(rink);
+  async function loadRink() {
+    let rink = await wasm();
+    Rink.setRink(rink);
+  }
+
+  loadRink();
 }
 
-loadRink();
+if (process.argv[2] == "batch-job") {
+  batchJob();
+} else {
+  main();
+}