fix(vector-search): detect existing keys on any cluster node

The keys endpoint returns one scan result per cluster node, but the
existing-keys probe only inspected the first entry. Keys living on any
other shard made the create-index page claim the database is empty and
enter manual creation. Aggregate the check across all returned nodes.

References: #RI-8171

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: dantovska

redisinsight/ui/src/pages/vector-search/hooks/useHasExistingKeys/useHasExistingKeys.spec.ts

@@ -56,6 +56,22 @@ describe('useHasExistingKeys', () => {
     expect(result.current.error).toBe(false)
   })
 
+  it('should detect keys held by any cluster node', async () => {
+    mockApiPost.mockResolvedValue({
+      status: 200,
+      data: [
+        { keys: [], total: 0 },
+        { keys: [{ name: 'key:1' }], total: 1 },
+      ],
+    })
+
+    const { result, waitForNextUpdate } = renderHook(() => useHasExistingKeys())
+
+    await waitForNextUpdate()
+
+    expect(result.current.hasKeys).toBe(true)
+  })
+
   it('should scan with the default scan count', async () => {
     mockApiPost.mockResolvedValue({
       status: 200,

redisinsight/ui/src/pages/vector-search/hooks/useHasExistingKeys/useHasExistingKeys.ts

@@ -61,12 +61,13 @@ export const useHasExistingKeys = (): UseHasExistingKeysResult => {
 
         if (signal?.aborted) return
 
+        // The endpoint returns one entry per cluster node — check them all
         const foundAny = results.some(({ data, status }) => {
           if (!isStatusSuccessful(status)) return false
-          const keys = Array.isArray(data)
-            ? data[0]?.keys
-            : (data as unknown as ScanResponse)?.keys
-          return keys && keys.length > 0
+          const nodes = Array.isArray(data)
+            ? data
+            : [data as unknown as ScanResponse]
+          return nodes.some((node) => !!node?.keys?.length)
         })
 
         setHasKeys(foundAny)