correct way fetching data

src/App.tsx

@@ -37,9 +37,10 @@ export default function App() {
       if (session?.user) fetchProfile()
     })
 
-    const { data: { subscription } } = supabase.auth.onAuthStateChange((_event, session) => {
+    const { data: { subscription } } = supabase.auth.onAuthStateChange((event, session) => {
       setUser(session?.user ?? null)
-      if (session?.user) fetchProfile()
+      // Only fetch profile on actual sign-in, not token refresh
+      if (event === 'SIGNED_IN' && session?.user) fetchProfile()
     })
 
     return () => subscription.unsubscribe()

src/hooks/useListeningProgress.ts

@@ -6,29 +6,33 @@ type ProgressMap = Map<string, { seconds: number; percent: number }>
 
 let cachedProgress: ProgressMap = new Map()
 let lastFetch = 0
+let progressInFlight: Promise<void> | null = null
 
 export function useListeningProgress() {
-  const user = useAuthStore((s) => s.user)
+  const userId = useAuthStore((s) => s.user?.id)
   const [progress, setProgress] = useState<ProgressMap>(cachedProgress)
 
   useEffect(() => {
-    if (!user) {
+    if (!userId) {
       cachedProgress = new Map()
       setProgress(cachedProgress)
       return
     }
 
-    // Refetch at most every 10s
+    // Refetch at most every 30s (was 10s — too aggressive)
     const now = Date.now()
-    if (now - lastFetch < 10_000 && cachedProgress.size > 0) {
+    if (now - lastFetch < 30_000 && cachedProgress.size > 0) {
       setProgress(cachedProgress)
       return
     }
 
-    supabase
+    // Deduplicate concurrent calls
+    if (progressInFlight) return
+
+    progressInFlight = supabase
       .from('listen_history')
       .select('podcast_id, progress_seconds, podcast:podcasts(duration_seconds)')
-      .eq('user_id', user.id)
+      .eq('user_id', userId)
       .eq('completed', false)
       .gt('progress_seconds', 5)
       .then(({ data }) => {
@@ -46,7 +50,8 @@ export function useListeningProgress() {
         lastFetch = Date.now()
         setProgress(map)
       })
-  }, [user])
+      .finally(() => { progressInFlight = null })
+  }, [userId])
 
   return progress
 }

src/hooks/useNotificationPolling.ts

@@ -12,7 +12,7 @@ export function useNotificationPolling() {
 
     fetch(user.id)
 
-    intervalRef.current = setInterval(() => fetch(user.id), 30000)
+    intervalRef.current = setInterval(() => fetch(user.id), 60000)
 
     function handleVisibility() {
       if (document.visibilityState === 'visible' && user) fetch(user.id)

src/pages/Home.tsx

@@ -73,15 +73,14 @@ export function Home() {
         setInProgress(items)
       }
 
-      // Fetch real stats for hero
+      // Compute stats for hero (non-logged-in) — 2 queries instead of 3
       if (!user) {
-        const [{ count: podcastCount }, { data: playsData }, { count: creatorCount }] = await Promise.all([
+        const [{ data: allPlays }, { count: creatorCount }] = await Promise.all([
-          supabase.from('podcasts').select('*', { count: 'exact', head: true }),
           supabase.from('podcasts').select('plays_count'),
           supabase.from('profiles').select('*', { count: 'exact', head: true }),
         ])
-        const totalPlays = playsData?.reduce((sum: number, p: any) => sum + (p.plays_count || 0), 0) || 0
+        const totalPlays = allPlays?.reduce((sum: number, p: any) => sum + (p.plays_count || 0), 0) || 0
-        setStats({ plays: totalPlays, creators: creatorCount || 0, podcasts: podcastCount || 0 })
+        setStats({ plays: totalPlays, creators: creatorCount || 0, podcasts: allPlays?.length || 0 })
       }
 
       setLoading(false)

src/stores/auth.ts

@@ -13,6 +13,9 @@ interface AuthState {
   signOut: () => Promise<void>
 }
 
+// Deduplicate fetchProfile — prevents double-fetch on init (getSession + onAuthStateChange)
+let profileInFlight: Promise<void> | null = null
+
 export const useAuthStore = create<AuthState>((set, get) => ({
   user: null,
   profile: null,
@@ -24,8 +27,12 @@ export const useAuthStore = create<AuthState>((set, get) => ({
 
   fetchProfile: async () => {
     const { user } = get()
-    if (!user) return set({ profile: null })
+    if (!user) { set({ profile: null }); return }
 
+    // If already fetching, reuse the same promise
+    if (profileInFlight) return profileInFlight
+
+    profileInFlight = (async () => {
       const { data, error } = await supabase
         .from('profiles')
         .select('*')
@@ -34,7 +41,8 @@ export const useAuthStore = create<AuthState>((set, get) => ({
 
       if (error) {
         console.error('Error fetching profile:', error)
-      return set({ profile: null })
+        set({ profile: null })
+        return
       }
 
       // Auto-create profile if it doesn't exist (trigger may have failed)
@@ -45,10 +53,14 @@ export const useAuthStore = create<AuthState>((set, get) => ({
           .insert({ id: user.id, username })
           .select()
           .single()
-      return set({ profile: newProfile })
+        set({ profile: newProfile })
+        return
       }
 
       set({ profile: data })
+    })().finally(() => { profileInFlight = null })
+
+    return profileInFlight
   },
 
   signOut: async () => {

src/stores/notifications.ts

@@ -10,11 +10,20 @@ interface NotificationsStore {
   markAllRead: (userId: string) => Promise<void>
 }
 
+// Deduplicate and throttle notification fetches (min 15s between fetches)
+let notifInFlight: Promise<void> | null = null
+let notifLastFetch = 0
+
 export const useNotificationsStore = create<NotificationsStore>((set) => ({
   notifications: [],
   unreadCount: 0,
 
   fetch: async (userId) => {
+    const now = Date.now()
+    if (now - notifLastFetch < 15_000) return
+    if (notifInFlight) return notifInFlight
+
+    notifInFlight = (async () => {
       const { data } = await supabase
         .from('notifications')
         .select('*')
@@ -27,6 +36,10 @@ export const useNotificationsStore = create<NotificationsStore>((set) => ({
           unreadCount: data.filter((n) => !n.read).length,
         })
       }
+      notifLastFetch = Date.now()
+    })().finally(() => { notifInFlight = null })
+
+    return notifInFlight
   },
 
   markRead: async (id) => {