diff --git a/frontend/src/pages/Economics.tsx b/frontend/src/pages/Economics.tsx
index 60d228f..551c22e 100644
--- a/frontend/src/pages/Economics.tsx
+++ b/frontend/src/pages/Economics.tsx
@@ -10,11 +10,10 @@ import {
   useEconomicsDaily,
   useEconomicsIntervals,
 } from '../hooks/useEconomics'
+import { useSiteStatus } from '../hooks/useSiteStatus'
 import { pragueCalendarDay } from '../lib/pragueDate'
 import type { DailyEconomics } from '../types/economics'
 
-const SITE_ID = 1
-
 function currentMonth(): string {
   const today = pragueCalendarDay()
   return today.slice(0, 7)
@@ -204,11 +203,14 @@ function DailyRow({
 }
 
 export default function Economics() {
+  const { site: siteRow, ready: siteReady, error: siteError } = useSiteStatus()
+  const siteId = siteRow?.site_id ?? null
+
   const [month, setMonth] = useState(currentMonth)
   const [expandedDay, setExpandedDay] = useState<string | null>(null)
 
-  const { days, hasGreenBonus, loading, error, reload } = useEconomicsDaily(SITE_ID, month)
-  const { points } = useEconomicsChart(SITE_ID, month)
+  const { days, hasGreenBonus, loading, error, reload } = useEconomicsDaily(siteId, month)
+  const { points } = useEconomicsChart(siteId, month)
 
   const summary = useMemo(() => {
     if (days.length === 0) return null
@@ -222,12 +224,13 @@ export default function Economics() {
 
   const handleLockToggle = useCallback(
     async (row: DailyEconomics) => {
+      if (siteId == null) return
       try {
         if (row.is_locked) {
-          await unlockDay(SITE_ID, row.day)
+          await unlockDay(siteId, row.day)
           toast.success(`Den ${row.day} odemčen`)
         } else {
-          await lockDay(SITE_ID, row.day)
+          await lockDay(siteId, row.day)
           toast.success(`Den ${row.day} zamčen`)
         }
         reload()
@@ -235,11 +238,24 @@ export default function Economics() {
         toast.error('Operace se nezdařila')
       }
     },
-    [reload],
+    [reload, siteId],
   )
 
   return (
     <main className="mx-auto max-w-7xl space-y-6 px-4 py-6 md:px-8">
+      {siteReady && siteRow && (
+        <p className="text-xs text-slate-500">
+          Lokalita: <span className="text-slate-400">{siteRow.site_code}</span> (id {siteRow.site_id}) — ekonomika vychází z{' '}
+          <code className="rounded bg-slate-800 px-1">audit_interval</code>, ne z raw telemetrie.
+        </p>
+      )}
+      {siteError && (
+        <div className="rounded-lg border border-amber-900/50 bg-amber-950/30 px-3 py-2 text-sm text-amber-200">
+          {siteError} — API ekonomiky potřebuje stejnou lokalitu jako Přehled (PostgREST{' '}
+          <code className="rounded bg-slate-900 px-1">vw_site_status</code>).
+        </div>
+      )}
+
       {/* Month selector */}
       <div className="flex items-center gap-4">
         <button
@@ -300,10 +316,30 @@ export default function Economics() {
             {error}
           </div>
         )}
-        {loading ? (
+        {!siteReady ? (
+          <div className="py-12 text-center text-sm text-slate-500">Načítání lokality…</div>
+        ) : siteId == null ? (
+          <div className="py-12 px-4 text-center text-sm text-slate-500">
+            Není dostupná lokalita z přehledu. Zkontrolujte PostgREST a tabulku{' '}
+            <code className="rounded bg-slate-800 px-1">ems.vw_site_status</code>.
+          </div>
+        ) : loading ? (
           <div className="py-12 text-center text-sm text-slate-500">Načítání…</div>
         ) : days.length === 0 ? (
-          <div className="py-12 text-center text-sm text-slate-500">Žádná data pro tento měsíc</div>
+          <div className="mx-auto max-w-lg py-10 px-4 text-center text-sm text-slate-400">
+            <p className="mb-2 font-medium text-slate-300">Žádná data pro tento měsíc</p>
+            <p className="mb-2">
+              Záložka čte jen to, co je v <code className="rounded bg-slate-800 px-1">ems.audit_interval</code> (15min agregace po
+              jobu audit filler). Telemetrie a ceny samy o sobě tabulku audit nenaplní.
+            </p>
+            <p className="mb-2">Zkuste jiný měsíc (šipky), pokud máte historii jinde než v aktuálním měsíci.</p>
+            <p>
+              Backfill na DB (psql):{' '}
+              <code className="mt-1 block break-all rounded bg-slate-900 p-2 text-left text-xs text-slate-300">
+                SELECT ems.fn_fill_audit_range(&lt;site_id&gt;, &apos;2024-01-01&apos;::timestamptz, now());
+              </code>
+            </p>
+          </div>
         ) : (
           <div className="overflow-x-auto">
             <table className="w-full">
@@ -328,7 +364,7 @@ export default function Economics() {
                     key={row.day}
                     row={row}
                     hasGreenBonus={hasGreenBonus}
-                    siteId={SITE_ID}
+                    siteId={siteId}
                     expanded={expandedDay === row.day}
                     onToggle={() => setExpandedDay((prev) => (prev === row.day ? null : row.day))}
                     onLockToggle={() => handleLockToggle(row)}