diff --git a/wetter.js b/wetter.js
index baf90a9..c9f9855 100644
--- a/wetter.js
+++ b/wetter.js
@@ -30,18 +30,30 @@ function log(msg)  { console.log (`[${fmt24h(new Date())}] ${msg}`); }
 function warn(msg) { console.warn(`[${fmt24h(new Date())}] WARN  ${msg}`); }
 function err(msg)  { console.error(`[${fmt24h(new Date())}] ERROR ${msg}`); }
 
-function postData(data, source) {
+async function postData(data, source) {
     if (!POST_URL) return;
     const headers = { "Content-Type": "application/json" };
     if (COLLECTOR_API_KEY) headers["X-API-Key"] = COLLECTOR_API_KEY;
-    fetch(POST_URL, { method: "POST", headers, body: JSON.stringify({ ...data, source }) })
-        .then(async res => {
-            if (!res.ok) {
-                const text = await res.text().catch(() => "");
-                warn(`POST ${res.status} ${res.statusText}: ${text.slice(0, 200)}`);
-            }
-        })
-        .catch(e => warn("POST fehlgeschlagen: " + e.message));
+    const body = JSON.stringify({ ...data, source });
+
+    for (let attempt = 1; attempt <= 5; attempt++) {
+        let res;
+        try {
+            res = await fetch(POST_URL, { method: "POST", headers, body });
+        } catch (e) {
+            warn("POST fehlgeschlagen: " + e.message);
+            return;
+        }
+        if (res.ok) return;
+        if (res.status === 429 && attempt < 5) {
+            const delay = Number(res.headers.get("Retry-After") ?? 2) * 1000;
+            await new Promise(r => setTimeout(r, delay));
+            continue;
+        }
+        const text = await res.text().catch(() => "");
+        warn(`POST ${res.status} ${res.statusText}: ${text.slice(0, 200)}`);
+        return;
+    }
 }
 
 // ── 5-Minuten-Aggregation ──────────────────────────────────────────────────
@@ -106,7 +118,7 @@ async function catchUpArchive(db) {
     const inserted = insertRecords(db, records, "archive");
     log(`Archiv: ${inserted} neue Datensätze gespeichert (${records.length} empfangen).`);
 
-    for (const r of records) postData(r, "archive");
+    for (const r of records) await postData(r, "archive");
 }
 
 // ── LOOP-Schleife ──────────────────────────────────────────────────────────