diff --git a/apps/nextjs/src/app/[locale]/_client-providers/query-persistence.spec.ts b/apps/nextjs/src/app/[locale]/_client-providers/query-persistence.spec.ts
index e84b12848..79003ea6d 100644
--- a/apps/nextjs/src/app/[locale]/_client-providers/query-persistence.spec.ts
+++ b/apps/nextjs/src/app/[locale]/_client-providers/query-persistence.spec.ts
@@ -42,6 +42,9 @@ describe("dashboard query persistence", () => {
     const supporting = createSuccessfulQuery([["app", "byIds"], { type: "query" }], [{ id: "app-1" }]);
     const ping = createSuccessfulQuery([["widget", "app", "ping"], { type: "query" }], { status: "online" });
     const beszel = createSuccessfulQuery([["widget", "beszel", "getSystemStats"], { type: "query" }], []);
+    const customApi = createSuccessfulQuery([["widget", "customApi", "getData"], { type: "query" }], {
+      apiKey: "secret",
+    });
     const unrelated = createSuccessfulQuery([["board", "getBoardByName"], { type: "query" }], { name: "Home" });
     const pendingClient = new QueryClient();
     const pending = pendingClient.getQueryCache().build(pendingClient, {
@@ -55,6 +58,7 @@ describe("dashboard query persistence", () => {
     expect(shouldPersistDashboardQuery(supporting.query)).toBe(true);
     expect(shouldPersistDashboardQuery(ping.query)).toBe(false);
     expect(shouldPersistDashboardQuery(beszel.query)).toBe(false);
+    expect(shouldPersistDashboardQuery(customApi.query)).toBe(false);
     expect(shouldPersistDashboardQuery(unrelated.query)).toBe(false);
     expect(shouldPersistDashboardQuery(pending)).toBe(false);
     expect(shouldPersistDashboardQuery(failed.query)).toBe(true);
diff --git a/apps/nextjs/src/app/[locale]/_client-providers/query-persistence.ts b/apps/nextjs/src/app/[locale]/_client-providers/query-persistence.ts
index 905fbb839..77dc9902b 100644
--- a/apps/nextjs/src/app/[locale]/_client-providers/query-persistence.ts
+++ b/apps/nextjs/src/app/[locale]/_client-providers/query-persistence.ts
@@ -4,7 +4,7 @@ import { removeOldestQuery } from "@tanstack/react-query-persist-client";
 import type { PersistQueryClientProviderProps } from "@tanstack/react-query-persist-client";
 import { parse, stringify } from "superjson";
 
-import { isWidgetDataQueryKey, queryCacheDefaultGcTimeMs } from "@homarr/api/query-cache";
+import { isPersistableDashboardQueryKey, queryCacheDefaultGcTimeMs } from "@homarr/api/query-cache";
 
 export const queryPersistenceBuster = "v5-dashboard-data";
 
@@ -19,7 +19,7 @@ interface PersistableQuery {
 }
 
 export const shouldPersistDashboardQuery = (query: PersistableQuery) =>
-  query.state.data !== undefined && isWidgetDataQueryKey(query.queryKey);
+  query.state.data !== undefined && isPersistableDashboardQueryKey(query.queryKey);
 
 const getSessionStorage = () => {
   if (typeof window === "undefined") return undefined;
diff --git a/apps/nextjs/src/app/[locale]/_client-providers/trpc.tsx b/apps/nextjs/src/app/[locale]/_client-providers/trpc.tsx
index 50dd85d7b..5b6621679 100644
--- a/apps/nextjs/src/app/[locale]/_client-providers/trpc.tsx
+++ b/apps/nextjs/src/app/[locale]/_client-providers/trpc.tsx
@@ -114,6 +114,7 @@ const ScopedTRPCReactProvider = ({
       queryCache: new QueryCache({
         onError(error, query) {
           if (!isTrpcForbiddenError(error) || !isWidgetDataQueryKey(query.queryKey)) return;
+          void queryPersistence.persister.removeClient();
           query.setState({ data: undefined, dataUpdatedAt: 0, isInvalidated: true });
         },
       }),
diff --git a/packages/api/src/query-cache.ts b/packages/api/src/query-cache.ts
index 7f77b7fbe..3ef88895b 100644
--- a/packages/api/src/query-cache.ts
+++ b/packages/api/src/query-cache.ts
@@ -19,6 +19,7 @@ export const queryCacheDefaultGcTimeMs = 1000 * 60 * 5;
 export const queryCacheMetadataStaleTimeMs = 1000 * 60 * 5;
 
 const widgetDataQueryPaths = new Set(["app.byId", "app.byIds", "docker.getContainers", "integration.byIds"]);
+const persistenceExcludedWidgetPaths = new Set(["widget.customApi.getData", "widget.customApi.queryRequest"]);
 // Beszel system stats are large time-series payloads and were deliberately kept out of
 // the persisted cache in #6289; live stats come from an SSE subscription instead.
 const excludedWidgetPaths = new Set(["widget.app.ping", "widget.beszel.getSystemStats"]);
@@ -77,3 +78,11 @@ export const isWidgetDataQueryKey = (queryKey: QueryKey) => {
 
   return isWidgetDataTrpcPath(path.join("."));
 };
+
+export const isPersistableDashboardQueryKey = (queryKey: QueryKey) => {
+  const path = getTrpcPathFromQueryKey(queryKey);
+  if (!path) return false;
+
+  const joinedPath = path.join(".");
+  return isWidgetDataTrpcPath(joinedPath) && !persistenceExcludedWidgetPaths.has(joinedPath);
+};