diff --git a/backend/app/lifespan.py b/backend/app/lifespan.py
index 3a1303e..2b9f9d1 100644
--- a/backend/app/lifespan.py
+++ b/backend/app/lifespan.py
@@ -124,6 +124,8 @@ async def lifespan(app: FastAPI):
                 rows = await conn.fetch("SELECT * FROM ems.fn_expire_modes()")
                 for r in rows:
                     await notify_operating_mode_changed(
+                        conn,
+                        int(r["site_id"]) if r.get("site_id") is not None else None,
                         str(r["site_code"]),
                         str(r["old_mode"]),
                         str(r["new_mode"]),
@@ -459,6 +461,8 @@ async def lifespan(app: FastAPI):
                         datetime.now(ZoneInfo("Europe/Prague")) - timedelta(days=1)
                     ).strftime("%Y-%m-%d")
                     await notify_daily_economics(
+                        conn,
+                        site_id,
                         site_code=site_code,
                         day=yesterday,
                         import_kwh=float(row.get("import_kwh") or 0),
diff --git a/backend/services/control/exporter_monolith.py b/backend/services/control/exporter_monolith.py
index 94523bf..5f2c73d 100644
--- a/backend/services/control/exporter_monolith.py
+++ b/backend/services/control/exporter_monolith.py
@@ -698,6 +698,8 @@ async def _verify_deye_clock_written_bundle(
         attempts = max(attempts, ac)
 
     await notify_modbus_mismatch(
+        db,
+        site_id,
         ac0,
         62,
         "system_time_62_64",
@@ -726,6 +728,8 @@ async def _verify_deye_clock_written_bundle(
         )
         site = await db.fetchrow("SELECT code FROM ems.site WHERE id=$1", site_id)
         await notify_modbus_clock_verify_exhausted(
+            db,
+            site_id,
             site["code"] if site else str(site_id),
             ac0,
             (w62, w63, w64),
@@ -858,6 +862,8 @@ async def verify_modbus_commands(
             )
             attempts = int(row_ac["attempt_count"] or 0) if row_ac else 0
             await notify_modbus_mismatch(
+                db,
+                site_id,
                 cmd["asset_code"],
                 reg,
                 cmd["register_name"] or "",
diff --git a/backend/services/notification_service.py b/backend/services/notification_service.py
index eb514da..302ce68 100644
--- a/backend/services/notification_service.py
+++ b/backend/services/notification_service.py
@@ -14,6 +14,40 @@ from app.config import get_settings
 
 logger = logging.getLogger(__name__)
 
+_WEBHOOK_CACHE: dict[tuple[int, str], str] = {}
+
+
+async def _get_site_webhook_url(
+    conn: asyncpg.Connection | None,
+    site_id: int | None,
+    kind: str,
+) -> str:
+    """
+    kind: 'daily' | 'error'
+    Fallback: settings.discord_webhook_url
+    """
+    settings = get_settings()
+    if site_id is None:
+        return settings.discord_webhook_url
+    cache_key = (int(site_id), str(kind))
+    cached = _WEBHOOK_CACHE.get(cache_key)
+    if cached is not None:
+        return cached
+    if conn is None:
+        return settings.discord_webhook_url
+    col = "discord_webhook_daily_url" if kind == "daily" else "discord_webhook_error_url"
+    try:
+        url = await conn.fetchval(
+            f"select {col} from ems.site where id = $1::int",
+            int(site_id),
+        )
+    except Exception:
+        logger.exception("Failed to load site webhook url site_id=%s kind=%s", site_id, kind)
+        url = None
+    final = str(url or settings.discord_webhook_url or "")
+    _WEBHOOK_CACHE[cache_key] = final
+    return final
+
 
 def _discord_level_for_mode_change(activated_by: str) -> str:
     if activated_by == "system:mismatch":
@@ -24,6 +58,8 @@ def _discord_level_for_mode_change(activated_by: str) -> str:
 
 
 async def notify_operating_mode_changed(
+    conn: asyncpg.Connection | None,
+    site_id: int | None,
     site_code: str,
     previous_mode: str,
     new_mode: str,
@@ -39,7 +75,7 @@ async def notify_operating_mode_changed(
         f"**{previous_mode}** → **{new_mode}**\n"
         f"Aktivoval: `{activated_by}`{note_line}"
     )
-    await send_discord(msg, level=lvl)
+    await send_discord(conn, site_id, msg, level=lvl)
 
 
 async def _auto_rolling_replan_after_self_sustain_exit(site_id: int) -> None:
@@ -100,6 +136,8 @@ async def run_fn_set_mode_with_discord(
     site_code = ctx.get("site_code")
     if prev is not None and prev != new:
         await notify_operating_mode_changed(
+            conn,
+            site_id,
             site_code or str(site_id),
             str(prev),
             str(new),
@@ -120,6 +158,8 @@ async def run_fn_set_mode_with_discord(
 
 
 async def notify_plan_vs_actual_fatal(
+    conn: asyncpg.Connection | None,
+    site_id: int | None,
     site_code: str,
     slot_label: str,
     interval_start_utc: datetime,
@@ -137,17 +177,22 @@ async def notify_plan_vs_actual_fatal(
         f"**{reason_code}**: {detail}\n"
         f"Plán grid: **{plan_grid_w}** W | Skutečnost: **{actual_grid_w}** W | Δ (act−plan): **{deviation_grid_w}** W"
     )
-    await send_discord(msg, level="critical")
+    await send_discord(conn, site_id, msg, level="critical")
 
 
-async def send_discord(message: str, level: str = "info") -> bool:
+async def send_discord(
+    conn: asyncpg.Connection | None,
+    site_id: int | None,
+    message: str,
+    level: str = "info",
+) -> bool:
     """
     Pošle notifikaci na Discord webhook.
     level: 'info', 'warning', 'error', 'critical'
     Vrátí True při úspěchu.
     """
-    settings = get_settings()
-    webhook_url = settings.discord_webhook_url
+    kind = "daily" if level == "info" else "error"
+    webhook_url = await _get_site_webhook_url(conn, site_id, kind)
     if not webhook_url:
         logger.debug("Discord webhook not configured, skipping notification")
         return False
@@ -170,6 +215,8 @@ async def send_discord(message: str, level: str = "info") -> bool:
 
 
 async def notify_modbus_mismatch(
+    conn: asyncpg.Connection | None,
+    site_id: int | None,
     asset_code: str,
     register: int,
     register_name: str,
@@ -183,18 +230,25 @@ async def notify_modbus_mismatch(
         f"Zapsáno: `{value_written}` | Přečteno: `{value_verified}`\n"
         f"Pokus č. {attempt}"
     )
-    await send_discord(msg, level="error")
+    await send_discord(conn, site_id, msg, level="error")
 
 
-async def notify_self_sustain_activated(site_code: str, reason: str) -> None:
+async def notify_self_sustain_activated(
+    conn: asyncpg.Connection | None,
+    site_id: int | None,
+    site_code: str,
+    reason: str,
+) -> None:
     msg = (
         f"Přepnutí na **SELF_SUSTAIN** – lokalita `{site_code}`\n"
         f"Důvod: {reason}"
     )
-    await send_discord(msg, level="critical")
+    await send_discord(conn, site_id, msg, level="critical")
 
 
 async def notify_modbus_clock_verify_exhausted(
+    conn: asyncpg.Connection | None,
+    site_id: int | None,
     site_code: str,
     asset_code: str,
     written: tuple[int, int, int],
@@ -206,10 +260,12 @@ async def notify_modbus_clock_verify_exhausted(
         f"Zapsáno: `{written}` | Přečteno: `{actual}`\n"
         f"Doporučení: zkontrolovat firmware/RS485; režim EMS se nemění automaticky."
     )
-    await send_discord(msg, level="critical")
+    await send_discord(conn, site_id, msg, level="critical")
 
 
 async def notify_daily_economics(
+    conn: asyncpg.Connection | None,
+    site_id: int | None,
     site_code: str,
     day: str,
     import_kwh: float,
@@ -236,4 +292,4 @@ async def notify_daily_economics(
             f"  Plán předpokládal: {planned_balance:+.2f} Kč "
             f"(odchylka {dev_sign}{dev:.2f} Kč)"
         )
-    await send_discord("\n".join(lines), level="info")
+    await send_discord(conn, site_id, "\n".join(lines), level="info")
diff --git a/backend/services/plan_actual_slot_guard.py b/backend/services/plan_actual_slot_guard.py
index 44bd44c..2d4e454 100644
--- a/backend/services/plan_actual_slot_guard.py
+++ b/backend/services/plan_actual_slot_guard.py
@@ -46,6 +46,7 @@ async def _dispatch_site_result(site_payload: dict[str, Any]) -> None:
         logger.warning("plan_actual_slot_guard: unknown site_id=%s", site_payload.get("site_id"))
         return
     site_code = str(site_payload.get("site_code") or site_payload.get("site_id") or "")
+    site_id = int(site_payload.get("site_id") or 0) or None
     alerts = site_payload.get("alerts")
     if not isinstance(alerts, list):
         return
@@ -62,6 +63,8 @@ async def _dispatch_site_result(site_payload: dict[str, Any]) -> None:
         deviation_grid_w = int(alert.get("deviation_grid_w") or 0)
         slot_label = _slot_label_prague(interval_start)
         await notify_plan_vs_actual_fatal(
+            None,
+            site_id,
             site_code=site_code,
             slot_label=slot_label,
             interval_start_utc=interval_start,
diff --git a/db/migration/V063__site_discord_webhooks.sql b/db/migration/V063__site_discord_webhooks.sql
new file mode 100644
index 0000000..272ec91
--- /dev/null
+++ b/db/migration/V063__site_discord_webhooks.sql
@@ -0,0 +1,10 @@
+alter table ems.site
+  add column if not exists discord_webhook_daily_url text,
+  add column if not exists discord_webhook_error_url text;
+
+comment on column ems.site.discord_webhook_daily_url is
+'Discord webhook pro běžné denní zprávy (např. ranní ekonomický report). Per-site konfigurace.';
+
+comment on column ems.site.discord_webhook_error_url is
+'Discord webhook pro error/critical alerty (mismatch, fatal plan vs actual, clock verify exhausted, apod.). Per-site konfigurace.';
+
diff --git a/docs/04-modules/control.md b/docs/04-modules/control.md
index ed1b3b7..323d312 100644
--- a/docs/04-modules/control.md
+++ b/docs/04-modules/control.md
@@ -284,6 +284,17 @@ LOXONE_PASSWORD=secret
 
 ---
 
+## Discord notifikace
+
+Discord notifikace jsou volitelné a routované per-site:
+
+- `ems.site.discord_webhook_daily_url` – denní zprávy (např. ranní ekonomický report)
+- `ems.site.discord_webhook_error_url` – error/critical alerty (mismatch, fatal plan vs actual, clock verify exhausted, …)
+
+Fallback: pokud per-site webhook není vyplněný, použije se env `DISCORD_WEBHOOK_URL`.
+
+---
+
 ## Otevřené body
 
 - [ ] Doplnit Modbus write registry Deye (charge/discharge/export limit)