Add others/scaler.mjs

others/scaler.mjs

@@ -0,0 +1,36 @@
+What about this import { LRUCache } from 'lru-cache';
+
+let maxKeys = 10_000;
+let cache   = makeCache(maxKeys);
+
+function makeCache(maxEntries) {
+  return new LRUCache({
+    maxSize: maxEntries,
+    ttl:     4 * 24 * 60 * 60 * 1_000,
+    allowStale:     false,
+    updateAgeOnGet: false,
+    updateAgeOnHas: false,
+  });
+}
+
+function scaleCache() {
+  const { heapUsed, heapTotal } = process.memoryUsage();
+  const freeHeapRatio = (heapTotal - heapUsed) / heapTotal;
+
+  const newMax = freeHeapRatio > 0.5
+    ? 20_000
+    : freeHeapRatio < 0.2
+      ? 5_000
+      : 10_000;
+
+  if (newMax !== maxKeys) {
+    maxKeys = newMax;
+    cache = makeCache(maxKeys);
+    console.log(`[SCALER] freeHeap ${( (heapTotal - heapUsed)/1e6 ).toFixed(1)}MB → maxKeys: ${maxKeys}`);
+  }
+}
+
+setInterval(scaleCache, 60_000);
+scaleCache();
+
+export { cache };