From f8638974c7ff13146d09052a326bb47160778dca Mon Sep 17 00:00:00 2001
From: you <you@example.com>
Date: Fri, 20 Mar 2026 03:48:55 +0000
Subject: [PATCH] =?UTF-8?q?perf:=20smart=20cache=20invalidation=20?=
 =?UTF-8?q?=E2=80=94=20only=20channels/observers=20on=20packet=20burst,=20?=
 =?UTF-8?q?node/health/analytics=20expire=20by=20TTL,=20node=20invalidated?=
 =?UTF-8?q?=20on=20ADVERT=20only?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 server.js | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/server.js b/server.js
index 883692bd..c080e5a7 100644
--- a/server.js
+++ b/server.js
@@ -75,12 +75,10 @@ class TTLCache {
     if (this._debounceTimer) return;
     this._debounceTimer = setTimeout(() => {
       this._debounceTimer = null;
-      this.invalidate('analytics:');
-      this.invalidate('channels');
-      this.invalidate('node:');
-      this.invalidate('health:');
-      this.invalidate('observers');
-      this.invalidate('bulk-health');
+      // Only invalidate truly time-sensitive caches
+      this.invalidate('channels');   // chat messages need freshness
+      this.invalidate('observers');   // observer packet counts
+      // node:, health:, bulk-health, analytics: all have long TTLs — let them expire naturally
     }, TTL.invalidationDebounce);
   }
   clear() { this.store.clear(); }
@@ -325,6 +323,10 @@ try {
           const p = decoded.payload;
           const role = p.flags ? (p.flags.repeater ? 'repeater' : p.flags.room ? 'room' : p.flags.sensor ? 'sensor' : 'companion') : 'companion';
           db.upsertNode({ public_key: p.pubKey, name: p.name || null, role, lat: p.lat, lon: p.lon, last_seen: now });
+          // Invalidate this node's caches on advert
+          cache.invalidate('node:' + p.pubKey);
+          cache.invalidate('health:' + p.pubKey);
+          cache.invalidate('bulk-health');
         }
 
         if (observerId) {