diff --git a/js/nostr/client.js b/js/nostr/client.js
index 3d2bb550..8df98750 100644
--- a/js/nostr/client.js
+++ b/js/nostr/client.js
@@ -161,6 +161,7 @@ import {
   summarizeRpcResultForLog,
   summarizeRelayPublishResultsForLog,
 } from "./nip46Client.js";
+import { profileCache } from "../state/profileCache.js";
 
 let activeSigner = null;
 const activeSignerRegistry = new Map();
@@ -278,6 +279,7 @@ function setActiveSigner(signer) {
       : "";
   if (pubkey) {
     activeSignerRegistry.set(pubkey, signer);
+    profileCache.clearSignerRuntime(pubkey);
   }
 }
 
@@ -3432,15 +3434,18 @@ export class NostrClient {
   }
 
   getSyncLastSeen(kind, pubkey, dTag, relayUrl) {
-    return this.syncMetadataStore.getLastSeen(kind, pubkey, dTag, relayUrl);
+    const effectivePubkey = pubkey || this.pubkey;
+    return this.syncMetadataStore.getLastSeen(kind, effectivePubkey, dTag, relayUrl);
   }
 
   updateSyncLastSeen(kind, pubkey, dTag, relayUrl, createdAt) {
-    this.syncMetadataStore.updateLastSeen(kind, pubkey, dTag, relayUrl, createdAt);
+    const effectivePubkey = pubkey || this.pubkey;
+    this.syncMetadataStore.updateLastSeen(kind, effectivePubkey, dTag, relayUrl, createdAt);
   }
 
   getPerRelaySyncLastSeen(kind, pubkey, dTag) {
-    return this.syncMetadataStore.getPerRelayLastSeen(kind, pubkey, dTag);
+    const effectivePubkey = pubkey || this.pubkey;
+    return this.syncMetadataStore.getPerRelayLastSeen(kind, effectivePubkey, dTag);
   }
 
   async fetchListIncrementally({ kind, pubkey, dTag, relayUrls, fetchFn } = {}) {
diff --git a/js/nostr/watchHistory.js b/js/nostr/watchHistory.js
index 0a5ce49f..c4c35968 100644
--- a/js/nostr/watchHistory.js
+++ b/js/nostr/watchHistory.js
@@ -955,6 +955,21 @@ class WatchHistoryManager {
     this.cacheTtlMs = 0;
     this.fingerprints = new Map();
     this.lastCreatedAt = 0;
+
+    profileCache.subscribe((event, detail) => {
+      if (event === "profileChanged") {
+        this.clear();
+      } else if (event === "runtimeCleared") {
+        const activePubkey = typeof this.deps.getActivePubkey === "function"
+          ? this.deps.getActivePubkey()
+          : "";
+        const normalized = normalizeActorKey(detail.pubkey);
+        const active = normalizeActorKey(activePubkey);
+        if (normalized && active && normalized === active) {
+          this.cache.delete(normalized);
+        }
+      }
+    });
   }
 
   getCacheTtlMs() {
diff --git a/js/services/hashtagPreferencesService.js b/js/services/hashtagPreferencesService.js
index f4b46bc6..4b0dc22f 100644
--- a/js/services/hashtagPreferencesService.js
+++ b/js/services/hashtagPreferencesService.js
@@ -249,6 +249,11 @@ class HashtagPreferencesService {
     profileCache.subscribe((event, detail) => {
       if (event === "profileChanged") {
         this.reset();
+      } else if (event === "runtimeCleared" && detail.pubkey === this.activePubkey) {
+        this.reset();
+        if (this.activePubkey) {
+          this.load(this.activePubkey);
+        }
       }
     });
   }
diff --git a/js/state/profileCache.js b/js/state/profileCache.js
index bc07fd38..a54bd62f 100644
--- a/js/state/profileCache.js
+++ b/js/state/profileCache.js
@@ -168,6 +168,7 @@ class ProfileCache {
     // But if services manage runtime state, `profileCache` acts as the persistence layer.
 
     this.emit("update", { pubkey, section, data });
+    this.emit("partition-updated", { pubkey, key: section });
   }
 
   // Runtime memory cache methods (for decrypted data, if services want to use it)
@@ -197,6 +198,15 @@ class ProfileCache {
     }
   }
 
+  clearSignerRuntime(pubkey) {
+    const normalized = this.normalizeHexPubkey(pubkey);
+    if (!normalized) {
+      return;
+    }
+    this.clearMemoryCache(normalized);
+    this.emit("runtimeCleared", { pubkey: normalized });
+  }
+
   subscribe(callback) {
     this.listeners.add(callback);
     return () => this.listeners.delete(callback);
diff --git a/js/subscriptions.js b/js/subscriptions.js
index 59f923ef..9f22cbe8 100644
--- a/js/subscriptions.js
+++ b/js/subscriptions.js
@@ -246,6 +246,11 @@ class SubscriptionsManager {
         this.reset();
         // Optionally reload immediately if we have a pubkey?
         // Usually UI triggers reload via showSubscriptionVideos
+      } else if (event === "runtimeCleared" && detail.pubkey === this.currentUserPubkey) {
+        this.reset();
+        if (this.currentUserPubkey) {
+          this.loadSubscriptions(this.currentUserPubkey);
+        }
       }
     });
   }
diff --git a/js/userBlocks.js b/js/userBlocks.js
index d67f249b..1b156db4 100644
--- a/js/userBlocks.js
+++ b/js/userBlocks.js
@@ -633,6 +633,11 @@ class UserBlockListManager {
     profileCache.subscribe((event, detail) => {
       if (event === "profileChanged") {
         this.reset();
+      } else if (event === "runtimeCleared" && detail.pubkey === this.activePubkey) {
+        this.reset();
+        if (this.activePubkey) {
+          this.loadBlocks(this.activePubkey);
+        }
       }
     });
   }
@@ -678,6 +683,8 @@ class UserBlockListManager {
 
   async loadBlocks(userPubkey, options = {}) {
     const normalized = normalizeHex(userPubkey);
+    this.activePubkey = normalized;
+
     if (!normalized) {
       this.reset();
       this.loaded = true;