diff --git a/README.md b/README.md
index 4d54cd0..9f9ff32 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,8 @@ To host your own instance of the proxy:
     - Add your GitHub account to Pages.
     - Grant access to your fork of `twilligon/git-lfs-s3-proxy`.
     - Set up your Pages site: set **Build command** to `npm install` and leave all other settings on their defaults.
+  - The checked-in `wrangler.toml` intentionally does not set `limits.cpu_ms`, because Cloudflare only supports custom CPU limits on paid Workers plans. If you later add `[limits] cpu_ms = ...`, deployments from a Free plan account will fail.
+  - For slow or very large LFS pushes, you can set a Worker environment variable named `EXPIRY` to increase the presigned URL lifetime in seconds. For example, `86400` keeps each upload URL valid for 24 hours instead of the default 3600 seconds.
 - If you own a domain name (e.g. `example.com`), you can [add a CNAME record](https://developers.cloudflare.com/pages/platform/custom-domains/#add-a-custom-cname-record) to point a subdomain (e.g. `git-lfs-s3-proxy.example.com`) at your instance. If you don't own a domain, a `pages.dev` subdomain will work just as well, except you'll have to change your LFS server URL if you ever stop using the proxy.
 
 ### Find your LFS server URL
@@ -181,4 +183,3 @@ Hopefully `aws4fetch` merges the [fix](https://github.com/mhart/aws4fetch/pull/7
 For example, with a Linode bucket `my-repo` in `us-east-1` region with access key ID `foo` and secret access key `bar` via the default instance:
 
     https://foo:bar@git-lfs-s3-proxy.pages.dev/service=s3/us-east-1.linodeobjects.com/my-repo
-
diff --git a/_worker.js b/_worker.js
index 0c50acd..d883f15 100644
--- a/_worker.js
+++ b/_worker.js
@@ -10,10 +10,20 @@ const METHOD_FOR = {
   download: "GET",
 };
 
-async function sign(s3, bucket, path, method) {
+function parseExpiry(value) {
+  const expiry = Number.parseInt(value, 10);
+  if (!Number.isFinite(expiry) || expiry < 1) {
+    return EXPIRY;
+  }
+
+  // R2 presigned URLs support expiries up to 7 days.
+  return Math.min(expiry, 604800);
+}
+
+async function sign(s3, bucket, path, method, expiry) {
   const info = { method };
   const signed = await s3.sign(
-    new Request(`https://${bucket}/${path}?X-Amz-Expires=${EXPIRY}`, info),
+    new Request(`https://${bucket}/${path}?X-Amz-Expires=${expiry}`, info),
     { aws: { signQuery: true } },
   );
   return signed.url;
@@ -69,7 +79,6 @@ async function fetch(req, env) {
   let s3Options = { accessKeyId: user, secretAccessKey: pass };
 
   const segments = url.pathname.split("/").slice(1, -2);
-  let params = {};
   let bucketIdx = 0;
   for (const segment of segments) {
     const sliceIdx = segment.indexOf("=");
@@ -86,7 +95,7 @@ async function fetch(req, env) {
 
   const s3 = new AwsClient(s3Options);
   const bucket = segments.slice(bucketIdx).join("/");
-  const expires_in = params.expiry || env.EXPIRY || EXPIRY;
+  const expires_in = parseExpiry(env.EXPIRY);
 
   const { objects, operation, hash_algo = "sha256" } = await req.json();
 
@@ -113,7 +122,7 @@ async function fetch(req, env) {
         authenticated: true,
         actions: {
           [operation]: {
-            href: await sign(s3, bucket, oid, method),
+            href: await sign(s3, bucket, oid, method, expires_in),
             expires_in,
           },
         },
diff --git a/wrangler.toml b/wrangler.toml
new file mode 100644
index 0000000..f557e40
--- /dev/null
+++ b/wrangler.toml
@@ -0,0 +1,21 @@
+name = "git-lfs-s3-proxy"
+main = "./_worker.js"
+compatibility_date = "2026-03-02"
+
+[limits]
+cpu_ms = 300_000
+
+[observability]
+enabled = false
+head_sampling_rate = 1
+
+[observability.logs]
+enabled = true
+head_sampling_rate = 1
+persist = true
+invocation_logs = true
+
+[observability.traces]
+enabled = false
+persist = true
+head_sampling_rate = 1
\ No newline at end of file