diff --git a/backend/services/price_importer.py b/backend/services/price_importer.py
index 2ce5e3d..9117dae 100644
--- a/backend/services/price_importer.py
+++ b/backend/services/price_importer.py
@@ -4,6 +4,7 @@ from __future__ import annotations
 import asyncio
 import json
 import logging
+from dataclasses import dataclass, field
 from datetime import date, datetime, timedelta
 from zoneinfo import ZoneInfo
 
@@ -13,6 +14,8 @@ from app.config import get_settings
 
 logger = logging.getLogger(__name__)
 
+OTE_EXPECTED_SLOTS = 96
+
 OTE_URL = (
     "https://www.ote-cr.cz/cs/kratkodobe-trhy/elektrina/denni-trh/"
     "@@chart-data?report_date={date}&time_resolution=PT15M"
@@ -93,6 +96,135 @@ async def _fetch_ote_json(date_str: str) -> tuple[dict | None, str | None]:
 OTE_TZ = ZoneInfo("Europe/Prague")
 
 
+async def _apply_ote_json_to_db(conn, payload: dict) -> int:
+    """Zapíše JSON z OTE přes ems.fn_ote_import_from_json; vrátí ROW_COUNT z funkce."""
+    settings = get_settings()
+    eur_czk = float(settings.eur_czk_rate)
+    n = await conn.fetchval(
+        "SELECT ems.fn_ote_import_from_json($1::jsonb, $2)",
+        json.dumps(payload),
+        eur_czk,
+    )
+    return int(n)
+
+
+async def count_ote_slots_prague_day(conn, target_day: date) -> int:
+    """Počet řádků OTE_CZ pro kalendářní den v Europe/Prague (96 očekáváno)."""
+    return int(
+        await conn.fetchval(
+            """
+            SELECT COUNT(*)::int
+            FROM ems.market_interval_price
+            WHERE market_source = 'OTE_CZ'
+              AND (interval_start AT TIME ZONE 'Europe/Prague')::date = $1::date
+            """,
+            target_day,
+        )
+        or 0
+    )
+
+
+async def import_ote_prices_for_day(
+    conn,
+    target_day: date,
+) -> tuple[int, str, float, str | None]:
+    """
+    Stáhne OTE pro jeden konkrétní report_date a uloží přes fn_ote_import_from_json.
+    Stejný význam návratové hodnoty jako import_ote_prices().
+    """
+    day_str = target_day.isoformat()
+    payload, fetch_error = await _fetch_ote_json(day_str)
+    if payload is None:
+        return -1, day_str, 0.0, fetch_error or "fetch_failed"
+    try:
+        n = await _apply_ote_json_to_db(conn, payload)
+        first_price = await conn.fetchval(
+            """
+            SELECT buy_raw_price_czk_kwh
+            FROM ems.market_interval_price
+            WHERE market_source = 'OTE_CZ'
+              AND (interval_start AT TIME ZONE 'Europe/Prague')::date = $1::date
+            ORDER BY interval_start
+            LIMIT 1
+            """,
+            target_day,
+        )
+        n_imported = await count_ote_slots_prague_day(conn, target_day)
+        if n_imported < OTE_EXPECTED_SLOTS:
+            logger.warning(
+                "OTE: jen %s/%s slotů pro %s (Europe/Prague)",
+                n_imported,
+                OTE_EXPECTED_SLOTS,
+                day_str,
+            )
+        logger.info(
+            "OTE import OK: %s slotů (upsert) pro %s, první cena %.4f Kč/kWh",
+            n,
+            day_str,
+            float(first_price or 0),
+        )
+        return n, day_str, float(first_price or 0.0), None
+    except Exception as e:
+        detail = str(e).strip() or e.__class__.__name__
+        logger.error("OTE import DB error pro %s: %s", day_str, detail, exc_info=True)
+        short = detail[:200] if len(detail) > 200 else detail
+        return -1, day_str, 0.0, f"db_import:{e.__class__.__name__}: {short}"
+
+
+@dataclass
+class OteBackfillStats:
+    start_date: date
+    end_date: date
+    days_checked: int = 0
+    days_imported: int = 0
+    days_skipped_complete: int = 0
+    days_skipped_future: int = 0
+    days_failed: int = 0
+    failures: list[tuple[str, str]] = field(default_factory=list)
+
+
+async def backfill_ote_prices(
+    conn,
+    *,
+    start_date: date,
+    end_date: date,
+    only_missing: bool = True,
+    pause_between_days_s: float = 0.35,
+    max_failures_logged: int = 80,
+) -> OteBackfillStats:
+    """
+    Projde rozsah [start_date, end_date] (kalendář Prague) a doplní chybějící dny z OTE.
+
+    only_missing: přeskočí dny, kde už je count >= OTE_EXPECTED_SLOTS.
+    pause_between_days_s: krátká pauza mezi HTTP požadavky (ohleduplnost k OTE).
+    """
+    stats = OteBackfillStats(start_date=start_date, end_date=end_date)
+    today_prague = datetime.now(OTE_TZ).date()
+    d = start_date
+    while d <= end_date:
+        stats.days_checked += 1
+        if d > today_prague:
+            stats.days_skipped_future += 1
+            d += timedelta(days=1)
+            continue
+        slots = await count_ote_slots_prague_day(conn, d)
+        if only_missing and slots >= OTE_EXPECTED_SLOTS:
+            stats.days_skipped_complete += 1
+            d += timedelta(days=1)
+            continue
+        n, day_str, _, err = await import_ote_prices_for_day(conn, d)
+        if n < 0:
+            stats.days_failed += 1
+            if len(stats.failures) < max_failures_logged:
+                stats.failures.append((day_str, err or "unknown"))
+        else:
+            stats.days_imported += 1
+        if pause_between_days_s > 0:
+            await asyncio.sleep(pause_between_days_s)
+        d += timedelta(days=1)
+    return stats
+
+
 async def import_ote_prices(
     db,
     site_id: int | None = None,
@@ -105,8 +237,6 @@ async def import_ote_prices(
     Returns: (počet_slotů, datum_str, první_cena_kč_kwh, error_code)
              (-1, datum_str, 0.0, error_code) při chybě
     """
-    settings = get_settings()
-
     if site_id is not None:
         row = await db.fetchrow(
             "SELECT timezone FROM ems.site WHERE id = $1", site_id
@@ -149,14 +279,8 @@ async def import_ote_prices(
 
     date_str = target_day.isoformat()
 
-    # Vše ostatní řeší PostgreSQL funkce
-    eur_czk = float(settings.eur_czk_rate)
     try:
-        n = await db.fetchval(
-            "SELECT ems.fn_ote_import_from_json($1::jsonb, $2)",
-            json.dumps(payload),
-            eur_czk,
-        )
+        n = await _apply_ote_json_to_db(db, payload)
         first_price = await db.fetchval(
             """
             SELECT buy_raw_price_czk_kwh
@@ -177,7 +301,7 @@ async def import_ote_prices(
             """,
             target_day,
         )
-        incomplete = (n_imported or 0) < 96
+        incomplete = (n_imported or 0) < OTE_EXPECTED_SLOTS
         if incomplete:
             now_p = datetime.now(ZoneInfo("Europe/Prague"))
             tomorrow_p = (now_p + timedelta(days=1)).date()
@@ -186,10 +310,17 @@ async def import_ote_prices(
                 target_day == tomorrow_p
                 and (now_p.hour, now_p.minute) < (14, 30)
             ):
-                logger.warning("OTE: jen %s/96 slotů pro %s", n_imported, date_str)
+                logger.warning(
+                    "OTE: jen %s/%s slotů pro %s",
+                    n_imported,
+                    OTE_EXPECTED_SLOTS,
+                    date_str,
+                )
         logger.info(
             "OTE import OK: %s slotů pro %s, první cena %.4f Kč/kWh",
-            n, date_str, float(first_price or 0),
+            n,
+            date_str,
+            float(first_price or 0),
         )
         return int(n), date_str, float(first_price or 0.0), None
     except Exception as e:
diff --git a/scripts/backfill_ote_prices.py b/scripts/backfill_ote_prices.py
new file mode 100644
index 0000000..566f688
--- /dev/null
+++ b/scripts/backfill_ote_prices.py
@@ -0,0 +1,202 @@
+#!/usr/bin/env python3
+"""
+Doplnění ems.market_interval_price z veřejného OTE JSON endpointu (stejný jako price_importer).
+
+Spuštění z kořene repozitáře (načte .env z kořene):
+
+  cd /path/to/ems-cursor
+  PYTHONPATH=backend python scripts/backfill_ote_prices.py
+
+Volby:
+  --days 730           posledních N kalendářních dní (Europe/Prague), výchozí 730 ≈ 2 roky
+  --from-date / --to-date  pevný rozsah YYYY-MM-DD (má přednost před --days u konce rozsahu)
+  --force              stáhnout znovu i dny, kde už je 96 slotů
+  --dry-run            jen vypsat chybějící dny, bez HTTP
+  --delay SEC          pauza mezi dny (výchozí 0.35)
+  --refresh-predictions  po skončení zavolat fn_predict_negative_price_windows pro aktivní site
+"""
+
+from __future__ import annotations
+
+import argparse
+import asyncio
+import logging
+import os
+import sys
+from datetime import date, datetime, timedelta
+from pathlib import Path
+from zoneinfo import ZoneInfo
+
+# Kořen repa = rodič scripts/
+_REPO_ROOT = Path(__file__).resolve().parent.parent
+_BACKEND = _REPO_ROOT / "backend"
+if str(_BACKEND) not in sys.path:
+    sys.path.insert(0, str(_BACKEND))
+
+os.chdir(_REPO_ROOT)
+
+import asyncpg  # noqa: E402
+
+from app.config import get_settings  # noqa: E402
+from services.price_importer import (  # noqa: E402
+    OTE_EXPECTED_SLOTS,
+    backfill_ote_prices,
+    count_ote_slots_prague_day,
+)
+
+PRAGUE = ZoneInfo("Europe/Prague")
+
+
+def _parse_ymd(s: str) -> date:
+    y, m, d = (int(p) for p in s.split("-", 2))
+    return date(y, m, d)
+
+
+async def _dry_run_missing(
+    conn: asyncpg.Connection,
+    start: date,
+    end: date,
+    today_prague: date,
+) -> list[date]:
+    out: list[date] = []
+    d = start
+    while d <= end:
+        if d > today_prague:
+            break
+        n = await count_ote_slots_prague_day(conn, d)
+        if n < OTE_EXPECTED_SLOTS:
+            out.append(d)
+        d += timedelta(days=1)
+    return out
+
+
+async def _refresh_predictions_all(conn: asyncpg.Connection) -> None:
+    sites = await conn.fetch("SELECT id FROM ems.site WHERE active = true")
+    for row in sites:
+        sid = int(row["id"])
+        try:
+            await conn.fetch("SELECT * FROM ems.fn_predict_negative_price_windows($1, 7)", sid)
+            logging.info("Predikce záporných cen obnovena pro site_id=%s", sid)
+        except Exception:
+            logging.exception("fn_predict_negative_price_windows selhalo pro site_id=%s", sid)
+
+
+async def main_async(args: argparse.Namespace) -> int:
+    settings = get_settings()
+    pool = await asyncpg.create_pool(
+        host=settings.db_host,
+        port=settings.db_port,
+        user=settings.db_user,
+        password=settings.db_password,
+        database=settings.db_name,
+        min_size=1,
+        max_size=3,
+    )
+    try:
+        today_prague = datetime.now(PRAGUE).date()
+        if args.to_date:
+            end = _parse_ymd(args.to_date)
+        else:
+            end = today_prague
+        if args.from_date:
+            start = _parse_ymd(args.from_date)
+        else:
+            start = end - timedelta(days=max(0, int(args.days) - 1))
+
+        if start > end:
+            logging.error("--from-date je po --to-date")
+            return 2
+
+        logging.info(
+            "Rozsah backfillu: %s … %s (kurz EUR/CZK z .env = %s)",
+            start.isoformat(),
+            end.isoformat(),
+            settings.eur_czk_rate,
+        )
+
+        async with pool.acquire() as conn:
+            if args.dry_run:
+                missing = await _dry_run_missing(conn, start, end, today_prague)
+                logging.info(
+                    "Dry-run: %s chybějících nebo neúplných dní (< %s slotů)",
+                    len(missing),
+                    OTE_EXPECTED_SLOTS,
+                )
+                for md in missing[:50]:
+                    n = await count_ote_slots_prague_day(conn, md)
+                    logging.info("  %s  (%s slotů)", md.isoformat(), n)
+                if len(missing) > 50:
+                    logging.info("  … a dalších %s dní", len(missing) - 50)
+                return 0
+
+            stats = await backfill_ote_prices(
+                conn,
+                start_date=start,
+                end_date=end,
+                only_missing=not args.force,
+                pause_between_days_s=float(args.delay),
+            )
+            logging.info(
+                "Hotovo: zkontrolováno %s dní, importováno %s, přeskočeno (kompletní) %s, "
+                "přeskočeno (budoucnost) %s, selhalo %s",
+                stats.days_checked,
+                stats.days_imported,
+                stats.days_skipped_complete,
+                stats.days_skipped_future,
+                stats.days_failed,
+            )
+            for day_str, err in stats.failures[:20]:
+                logging.warning("  %s: %s", day_str, err)
+            if len(stats.failures) > 20:
+                logging.warning("  … dalších %s chyb v seznamu", len(stats.failures) - 20)
+
+            if args.refresh_predictions and stats.days_imported > 0:
+                await _refresh_predictions_all(conn)
+
+            return 1 if stats.days_failed else 0
+    finally:
+        await pool.close()
+
+
+def main() -> None:
+    logging.basicConfig(
+        level=logging.INFO,
+        format="%(levelname)s %(message)s",
+    )
+    parser = argparse.ArgumentParser(description="Backfill OTE cen do ems.market_interval_price")
+    parser.add_argument(
+        "--days",
+        type=int,
+        default=730,
+        help="Počet dní zpět od --to-date (výchozí 730)",
+    )
+    parser.add_argument("--from-date", type=str, default=None, help="YYYY-MM-DD začátek rozsahu")
+    parser.add_argument(
+        "--to-date",
+        type=str,
+        default=None,
+        help="YYYY-MM-DD konec rozsahu (výchozí dnes Europe/Prague)",
+    )
+    parser.add_argument(
+        "--force",
+        action="store_true",
+        help="Stáhnout znovu i dny s plnými %s sloty" % OTE_EXPECTED_SLOTS,
+    )
+    parser.add_argument("--dry-run", action="store_true", help="Jen vypsat chybějící dny")
+    parser.add_argument(
+        "--delay",
+        type=float,
+        default=0.35,
+        help="Sekundy pauzy mezi dny (výchozí 0.35)",
+    )
+    parser.add_argument(
+        "--refresh-predictions",
+        action="store_true",
+        help="Po importu obnovit fn_predict_negative_price_windows pro aktivní lokality",
+    )
+    ns = parser.parse_args()
+    raise SystemExit(asyncio.run(main_async(ns)))
+
+
+if __name__ == "__main__":
+    main()