diff --git a/backend/app/routers/sites.py b/backend/app/routers/sites.py
index 30c5997..ac26269 100644
--- a/backend/app/routers/sites.py
+++ b/backend/app/routers/sites.py
@@ -75,6 +75,47 @@ async def get_site_prices(
     return [r for r in rows if isinstance(r, dict)]
 
 
+@router.get("/{site_id}/prices/slots")
+async def get_site_prices_slots_range(
+    site_id: int,
+    db: Annotated[asyncpg.Pool, Depends(get_pg_pool)],
+    from_ts: datetime = Query(
+        ...,
+        alias="from",
+        description="Začátek okna [from, to), typicky UTC zaokrouhlené na 15 min",
+    ),
+    to_ts: datetime = Query(
+        ...,
+        alias="to",
+        description="Konec polouzavřeného intervalu (max. 14 dní za from)",
+    ),
+) -> dict[str, list[dict[str, Any]]]:
+    if to_ts <= from_ts:
+        raise HTTPException(status_code=422, detail="'to' must be after 'from'")
+    if to_ts - from_ts > timedelta(days=14):
+        raise HTTPException(
+            status_code=422,
+            detail="Span between 'from' and 'to' must be at most 14 days",
+        )
+    async with db.acquire() as conn:
+        site_ok = await conn.fetchval(
+            "SELECT EXISTS(SELECT 1 FROM ems.site WHERE id = $1)", site_id
+        )
+        if not site_ok:
+            raise HTTPException(status_code=404, detail="Site not found")
+        raw = await fetch_json(
+            conn,
+            "select ems.fn_site_effective_prices_slots_range($1::int, $2::timestamptz, $3::timestamptz)",
+            site_id,
+            from_ts,
+            to_ts,
+        )
+    rows = raw if isinstance(raw, list) else []
+    if not isinstance(rows, list):
+        rows = []
+    return {"slots": [r for r in rows if isinstance(r, dict)]}
+
+
 class PricesImportResponse(BaseModel):
     slots_imported: int
     date: str
diff --git a/db/routines/R__067_fn_site_effective_prices_slots_range.sql b/db/routines/R__067_fn_site_effective_prices_slots_range.sql
new file mode 100644
index 0000000..dff0eba
--- /dev/null
+++ b/db/routines/R__067_fn_site_effective_prices_slots_range.sql
@@ -0,0 +1,28 @@
+create or replace function ems.fn_site_effective_prices_slots_range(
+  p_site_id int,
+  p_from timestamptz,
+  p_to timestamptz
+)
+returns jsonb
+language sql
+stable
+as $fn$
+  select coalesce(
+    jsonb_agg(u.j order by u.interval_start),
+    '[]'::jsonb
+  )
+  from (
+    select
+      v.interval_start,
+      to_jsonb(v) as j
+    from ems.vw_site_effective_price v
+    where v.site_id = p_site_id
+      and v.interval_start >= p_from
+      and v.interval_end < p_to
+    order by v.interval_start
+  ) u;
+$fn$;
+
+comment on function ems.fn_site_effective_prices_slots_range(int, timestamptz, timestamptz) is
+  'Efektivní ceny pro [p_from, p_to) jako pole JSON řádků view (range pro UI bez PostgREST auth).';
+
diff --git a/frontend/src/api/backend.ts b/frontend/src/api/backend.ts
index 78053de..78d135e 100644
--- a/frontend/src/api/backend.ts
+++ b/frontend/src/api/backend.ts
@@ -270,6 +270,18 @@ export async function getSitePrices(siteId: number, date: string): Promise<SiteE
   return Array.isArray(data) ? data : []
 }
 
+export async function getSitePricesSlotsRange(
+  siteId: number,
+  fromIso: string,
+  toIso: string,
+): Promise<SiteEffectivePriceRowDto[]> {
+  const { data } = await client.get<{ slots?: SiteEffectivePriceRowDto[] }>(
+    `/sites/${siteId}/prices/slots`,
+    { params: { from: fromIso, to: toIso }, timeout: 60_000 },
+  )
+  return Array.isArray(data?.slots) ? data.slots : []
+}
+
 export type ForecastPvIntervalRow = {
   interval_start: string
   power_w?: number | string | null
diff --git a/frontend/src/hooks/useDashboardData.ts b/frontend/src/hooks/useDashboardData.ts
index b7b0226..855071a 100644
--- a/frontend/src/hooks/useDashboardData.ts
+++ b/frontend/src/hooks/useDashboardData.ts
@@ -4,6 +4,7 @@ import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import {
   getCurrentPlan,
   getForecastPvSlotsRangeCorrected,
+  getSitePricesSlotsRange,
 } from '../api/backend'
 import { getJson } from '../api/postgrest'
 import {
@@ -20,7 +21,6 @@ import type {
   HeatPumpLatestRow,
   ModeLogRecentRow,
   SiteStatusRow,
-  SiteEffectivePriceRow,
   Telemetry15m7dRow,
 } from '../types/ems'
 import type { PlanningIntervalDto } from '../types/plan'
@@ -220,15 +220,12 @@ export function useDashboardData(siteId: number | null) {
           limit: '200',
         }),
         getJson<HeatPumpLatestRow[]>('/vw_latest_heat_pump', { site_id: `eq.${siteId}` }),
-        // Ceny bereme v jednom range dotazu přes PostgREST view (místo N× /api/v1/sites/{id}/prices?date=...).
-        // Okno: [windowStart, windowStart + TOTAL_SLOTS) pro mapování na sloty.
-        getJson<SiteEffectivePriceRow[]>('/vw_site_effective_price', {
-          site_id: `eq.${siteId}`,
-          interval_start: `gte.${new Date(windowStart).toISOString()}`,
-          interval_end: `lt.${new Date(windowStart + TOTAL_SLOTS * SLOT_MS).toISOString()}`,
-          order: 'interval_start.asc',
-          limit: String(TOTAL_SLOTS + 32),
-        }),
+        // Ceny bereme přes FastAPI range endpoint (PostgREST /rest je u vás chráněné → 401).
+        getSitePricesSlotsRange(
+          siteId,
+          new Date(windowStart).toISOString(),
+          new Date(windowStart + TOTAL_SLOTS * SLOT_MS).toISOString(),
+        ),
       ])
 
       const status = Array.isArray(statusArr) && statusArr[0] ? statusArr[0]! : null
@@ -242,7 +239,7 @@ export function useDashboardData(siteId: number | null) {
       }
 
       const priceBySlot = new Map<string, { buy: number | null; sell: number | null }>()
-      const flatPrices: SiteEffectivePriceRow[] = Array.isArray(priceRows) ? priceRows : []
+      const flatPrices = Array.isArray(priceRows) ? priceRows : []
       for (const r of flatPrices) {
         const k = slotTimeKey(new Date(r.interval_start).getTime())
         priceBySlot.set(k, {