FUE-T09: grace-shift *_today daily reset past local midnight + dedicated 00:00:10 publish

app/integrations/expose.py

@@ -27,6 +27,7 @@ from __future__ import annotations
 
 import logging
 from dataclasses import dataclass, field
+from datetime import timedelta
 from typing import Any, Callable, Optional, Protocol
 
 from sqlalchemy.orm import Session
@@ -369,6 +370,10 @@ register_provider(_modbus_provider)
 # Energy Cost provider
 # ---------------------------------------------------------------------------
 
+# *_today 当日窗口翻天的宽限：本地午夜后 5 秒才切到新的一天，避免在 00:00:0x 把
+# 归零后的值发出去、被慢几秒的 HA 钟记成前一天的 23:59:59（归错小时桶）。
+_TODAY_RESET_GRACE = timedelta(seconds=5)
+
 
 def _energy_cost_provider(session: Session) -> list[ExposableEntity]:
     """Enumerate ExposableEntity objects for the energy cost subsystem.
@@ -735,7 +740,11 @@ def _energy_cost_provider(session: Session) -> list[ExposableEntity]:
                 return None
 
             # Today's window in UTC, using monkeypatch-safe module attribute calls.
-            today_local = _tz_mod.local_now().date()
+            # Grace: subtract _TODAY_RESET_GRACE so that in the first 5 seconds after
+            # local midnight the getter still returns yesterday's window.  This prevents
+            # a "归零后的值" from being published while HA's clock (which may lag a few
+            # seconds) would stamp it as 23:59:59 of the previous day.
+            today_local = (_tz_mod.local_now() - _TODAY_RESET_GRACE).date()
             tomorrow_local = today_local + _td(days=1)
             today_start_utc = _tz_mod.local_midnight_utc(today_local)
             tomorrow_start_utc = _tz_mod.local_midnight_utc(tomorrow_local)
@@ -772,7 +781,8 @@ def _energy_cost_provider(session: Session) -> list[ExposableEntity]:
             if not versions:
                 return None
 
-            today_local = _tz_mod.local_now().date()
+            # Grace: same logic as import_cost_today — see that getter's comment.
+            today_local = (_tz_mod.local_now() - _TODAY_RESET_GRACE).date()
             tomorrow_local = today_local + _td(days=1)
             today_start_utc = _tz_mod.local_midnight_utc(today_local)
             tomorrow_start_utc = _tz_mod.local_midnight_utc(tomorrow_local)

app/main.py

@@ -7,6 +7,7 @@ from fastapi import FastAPI, HTTPException, Request
 from fastapi.responses import FileResponse
 from fastapi.staticfiles import StaticFiles
 from apscheduler.schedulers.background import BackgroundScheduler
+from apscheduler.triggers.cron import CronTrigger
 from apscheduler.triggers.interval import IntervalTrigger
 from sqlalchemy.orm import Session
 
@@ -36,6 +37,7 @@ from app.services.modbus_poll import poll_all_enabled_devices, BASE_POLL_TICK_SE
 from app.services.ha_discovery import publish_discovery, publish_states
 from app.services.tibber_prices import refresh_prices
 from app.services.energy_cost import compute_closed_periods
+from app.services.timezone import local_tz
 from scripts.app_db_adopt import AppDatabaseAdoptionError, validate_app_runtime_db
 
 logger = logging.getLogger(__name__)
@@ -159,6 +161,20 @@ def _run_scheduled_ha_state_publish() -> None:
         session.close()
 
 
+def _run_midnight_state_publish() -> None:
+    """本地午夜后不久专门发布一次状态，让 *_today 的每日归零稳稳落在午夜之后
+    （对 HA 钟慢几秒鲁棒）。best-effort：失败仅记日志，不影响调度器。"""
+    session_local = get_session_local()
+    session = session_local()
+    try:
+        from app.services.ha_discovery import publish_states
+        publish_states(session)
+    except Exception:
+        logger.exception("_run_midnight_state_publish: failed (non-fatal)")
+    finally:
+        session.close()
+
+
 def ensure_auth_db_ready() -> None:
     session_local = get_session_local()
     session: Session = session_local()
@@ -233,6 +249,17 @@ async def lifespan(_: FastAPI):
         max_instances=1,
         coalesce=True,
     )
+    # Dedicated midnight publish: fire at local 00:00:10 so *_today grace (5 s) has
+    # already elapsed and the day-rolled value is pushed to HA immediately, rather
+    # than waiting for the next 60-second ha-state-publish sweep.
+    scheduler.add_job(
+        _run_midnight_state_publish,
+        trigger=CronTrigger(hour=0, minute=0, second=10, timezone=local_tz()),
+        id="midnight-today-publish",
+        replace_existing=True,
+        max_instances=1,
+        coalesce=True,
+    )
     scheduler.start()
 
     # MQTT: connect using DB-merged runtime settings so broker configured via UI

app/services/energy_cost.py

@@ -123,6 +123,10 @@ _READING_MAX_STALENESS = timedelta(minutes=_PERIOD_MINUTES)
 # degraded to prevent negative costs or grossly inflated charges.
 _MAX_DELTA_KWH = Decimal("100")
 
+# 每日固定费/税补在"本地午夜后多久"才结算入账。延后到 01:05 是为了让累计成本的
+# 整天阶跃落在新一天、且避开 01:00 整点（HA 长期统计的小时桶边界）。
+_SETTLEMENT_OFFSET = timedelta(hours=1, minutes=5)
+
 # DSMR payload register keys (cumulative kWh, JSON string values).
 _KEY_D1 = "electricity_delivered_1"   # delivered low-tariff  (dal / _1)
 _KEY_D2 = "electricity_delivered_2"   # delivered high-tariff (normal / _2)
@@ -764,7 +768,8 @@ def summarize(session: Session, start: datetime, end: datetime) -> dict[str, Any
     days = _to_decimal(str(total_seconds)) / _to_decimal("86400")
 
     # --- Fixed costs and credits: Principle C cross-version whole-day counting ---
-    today_local: _date = local_now().date()
+    _now_local = local_now()
+    today_local: _date = _now_local.date()
 
     # --- Compute [first_counted, last_counted] local date range (inclusive) ---
     #
@@ -811,8 +816,16 @@ def summarize(session: Session, start: datetime, end: datetime) -> dict[str, Any
     else:
         last_counted = local_end_date - _td(days=1)
 
-    # Cap: only elapsed or today's days.
-    last_counted = min(last_counted, today_local)
+    # Settlement cap: "today" is only counted once the local clock has passed the
+    # settlement offset since midnight (01:05).  This defers the daily standing-charge
+    # step from 00:00 to 01:05, ensuring the cumulative-cost adiabatic jump lands
+    # inside the new calendar day and avoids the HA 01:00 hourly-bucket boundary.
+    _today_midnight_utc = _lmu(today_local)
+    if _now_local >= _today_midnight_utc + _SETTLEMENT_OFFSET:
+        settled_cap = today_local
+    else:
+        settled_cap = today_local - _td(days=1)
+    last_counted = min(last_counted, settled_cap)
 
     # If the range is empty (first_counted > last_counted), no days are counted.
 

tests/test_energy_cost.py

@@ -1199,10 +1199,16 @@ def _ams_midnight(year: int, month: int, day: int) -> datetime:
 
 
 class TestSummarizePrincipleC:
-    """Principle C whole-day counting with pinned Europe/Amsterdam timezone."""
+    """Principle C whole-day counting with pinned Europe/Amsterdam timezone.
+
+    Tests that assert a specific "today" (e.g. June 25) must also pin
+    ``local_now`` via *pinned_now* to remain deterministic as wall-clock
+    time advances.  Tests that only care about windows entirely in the past
+    or entirely in the future do not need to pin ``local_now``.
+    """
 
     # Effective_from: June 1 CEST local midnight = May 31 22:00 UTC.
-    # Today local = June 25 CEST (since today is 2026-06-25).
+    # Reference "today" pinned in individual tests = June 25 CEST.
 
     def _make_single_version_contract(self, session: Session, *, effective_from_utc: datetime) -> None:
         """Create an active manual contract with a single version."""
@@ -1210,10 +1216,27 @@ class TestSummarizePrincipleC:
         _make_version(session, contract, _MANUAL_VALUES, effective_from=effective_from_utc)
         session.commit()
 
-    def _run_summarize_ams(self, session: Session, start_utc: datetime, end_utc: datetime) -> dict:
-        """Run summarize with Europe/Amsterdam local_tz monkeypatched."""
+    def _run_summarize_ams(
+        self,
+        session: Session,
+        start_utc: datetime,
+        end_utc: datetime,
+        *,
+        pinned_now: datetime | None = None,
+    ) -> dict:
+        """Run summarize with Europe/Amsterdam local_tz monkeypatched.
+
+        If *pinned_now* is given, also patches ``app.services.energy_cost.local_now``
+        to that fixed value, making settlement-offset logic deterministic
+        regardless of wall-clock time.
+        """
         from unittest.mock import patch
+        import app.services.energy_cost as _ec
+
         with patch.object(tz_module, "local_tz", return_value=_ams()):
+            if pinned_now is not None:
+                with patch.object(_ec, "local_now", return_value=pinned_now):
+                    return summarize(session, start_utc, end_utc)
             return summarize(session, start_utc, end_utc)
 
     def test_today_window_counts_1_day(self, energy_db: Session) -> None:
@@ -1259,7 +1282,10 @@ class TestSummarizePrincipleC:
     def test_this_month_window_counts_25_days(self, energy_db: Session) -> None:
         """This Month (June 1 → July 1 local) counts 25 elapsed days (June 1..25).
 
-        Today = June 25 local, so June 26–30 are not yet elapsed.
+        Pins ``local_now`` to June 25 noon AMS so the test is deterministic
+        regardless of the actual wall-clock date.  June 25 is well past the
+        01:05 settlement offset, so ``settled_cap = June 25``.
+        Today = June 25 local, so June 26–30 are not yet elapsed → 25 days.
         Matches table row: 6/1→7/1 (This Month) → 25 days.
         """
         eff_utc = _ams_midnight(2026, 6, 1)
@@ -1267,7 +1293,9 @@ class TestSummarizePrincipleC:
 
         start = _ams_midnight(2026, 6, 1)
         end = _ams_midnight(2026, 7, 1)
-        result = self._run_summarize_ams(energy_db, start, end)
+        # Pin local_now to June 25 2026 noon AMS (well past 01:05 settlement).
+        pinned_now = datetime(2026, 6, 25, 12, 0, 0, tzinfo=_ams())
+        result = self._run_summarize_ams(energy_db, start, end, pinned_now=pinned_now)
 
         daily_fixed = (9.87 + 9.87) / 30
         daily_credit = 600.0 / 365
@@ -1304,8 +1332,9 @@ class TestSummarizePrincipleC:
     def test_partial_future_window_caps_at_today(self, energy_db: Session) -> None:
         """A window partially in the future caps at today (only elapsed days counted).
 
+        Pins ``local_now`` to June 25 noon AMS so the test is deterministic.
         Window: June 25 → June 28 local (4 dates, but June 26/27 are future).
-        Today = June 25 → only 1 day elapsed (June 25).
+        Today = June 25 → settled_cap = June 25 → only 1 day elapsed (June 25).
         Matches table row: 6/25→6/28 → 1 day.
         """
         eff_utc = _ams_midnight(2026, 6, 1)
@@ -1313,7 +1342,9 @@ class TestSummarizePrincipleC:
 
         start = _ams_midnight(2026, 6, 25)
         end = _ams_midnight(2026, 6, 28)
-        result = self._run_summarize_ams(energy_db, start, end)
+        # Pin local_now to June 25 2026 noon AMS (well past 01:05 settlement).
+        pinned_now = datetime(2026, 6, 25, 12, 0, 0, tzinfo=_ams())
+        result = self._run_summarize_ams(energy_db, start, end, pinned_now=pinned_now)
 
         daily_fixed = (9.87 + 9.87) / 30
         daily_credit = 600.0 / 365
@@ -1366,8 +1397,12 @@ class TestSummarizePrincipleC:
         start = _ams_midnight(2026, 6, 1)
         end = _ams_midnight(2026, 7, 1)
         from unittest.mock import patch
+        import app.services.energy_cost as _ec
+        # Pin local_now to June 25 2026 noon AMS: today=June 25, settled_cap=June 25.
+        pinned_now = datetime(2026, 6, 25, 12, 0, 0, tzinfo=_ams())
         with patch.object(tz_module, "local_tz", return_value=_ams()):
-            result = summarize(energy_db, start, end)
+            with patch.object(_ec, "local_now", return_value=pinned_now):
+                result = summarize(energy_db, start, end)
 
         # V1: 24 days × (6+6)/30; V2: 1 day × (12+12)/30
         expected_fixed = 24 * 12 / 30 + 1 * 24 / 30
@@ -1408,12 +1443,16 @@ class TestSummarizePrincipleC:
         _make_version(energy_db, contract, _VALUES_V2, effective_from=v2_from)
         energy_db.commit()
 
-        # Window = June 25 only (today, 1 day elapsed at V2 rate)
+        # Window = June 25 only (today, 1 day elapsed at V2 rate).
+        # Pin local_now to June 25 noon AMS: today=June 25, settled_cap=June 25.
         start = _ams_midnight(2026, 6, 25)
         end = _ams_midnight(2026, 7, 1)
         from unittest.mock import patch
+        import app.services.energy_cost as _ec
+        pinned_now = datetime(2026, 6, 25, 12, 0, 0, tzinfo=_ams())
         with patch.object(tz_module, "local_tz", return_value=_ams()):
-            result = summarize(energy_db, start, end)
+            with patch.object(_ec, "local_now", return_value=pinned_now):
+                result = summarize(energy_db, start, end)
 
         # Only 1 day at V2 rate
         expected_fixed = 1 * 24 / 30
@@ -1434,13 +1473,11 @@ class TestSummarizePrincipleC:
           within the day start_utc falls.  June 24 is the anchor day → its charge is counted.
 
         Window: [June 24 07:18 UTC (= 09:18 CEST), June 26 22:00 UTC (= June 27 00:00 CEST)).
-        Today local = June 25 (2026-06-25).
+        Pins local_now to June 25 noon AMS → today=June 25, settled_cap=June 25.
         first_counted = June 24 (anchor day, previously dropped).
         last_counted = min(June 26, June 25) = June 25.
         n_days = June 25 - June 24 + 1 = 2.
         """
-        from unittest.mock import patch
-
         eff_utc = _ams_midnight(2026, 6, 1)
         self._make_single_version_contract(energy_db, effective_from_utc=eff_utc)
 
@@ -1449,8 +1486,9 @@ class TestSummarizePrincipleC:
         # end = June 26 22:00 UTC = June 27 00:00 CEST (past today June 25, capped)
         end_utc = datetime(2026, 6, 26, 22, 0, 0, tzinfo=_UTC)
 
-        with patch.object(tz_module, "local_tz", return_value=_ams()):
-            result = self._run_summarize_ams(energy_db, anchor_utc, end_utc)
+        # Pin local_now to June 25 noon AMS: today=June 25, settled_cap=June 25.
+        pinned_now = datetime(2026, 6, 25, 12, 0, 0, tzinfo=_ams())
+        result = self._run_summarize_ams(energy_db, anchor_utc, end_utc, pinned_now=pinned_now)
 
         daily_fixed = (9.87 + 9.87) / 30
         daily_credit = 600.0 / 365
@@ -2409,3 +2447,266 @@ class TestMeterAwareComputePeriod:
         assert row.degraded is False, "All-zero deltas must not trigger the D6 guard"
         assert row.import_cost == 0.0
         assert row.net_cost == 0.0
+
+
+# ---------------------------------------------------------------------------
+# FUE-T08. summarize — settlement offset (local 01:05)
+# ---------------------------------------------------------------------------
+
+
+class TestSummarizeSettlementOffset:
+    """FUE-T08: daily fixed-fee/heffingskorting settled after local 01:05.
+
+    Reference date: June 26, 2026 AMS (CEST = UTC+2).
+      - AMS midnight June 26  = June 25 22:00 UTC
+      - Settlement threshold  = June 25 22:00 + 01:05 = June 25 23:05 UTC
+                              = June 26 01:05 AMS
+      - "before offset" now   = June 26 00:30 AMS = June 25 22:30 UTC
+      - "after  offset" now   = June 26 01:10 AMS = June 25 23:10 UTC
+
+    All tests monkeypatch both local_tz (Europe/Amsterdam) and
+    ``app.services.energy_cost.local_now`` to be fully deterministic.
+    """
+
+    # UTC instants used as "now":
+    # June 25 22:30 UTC = June 26 00:30 AMS (before settlement threshold 23:05 UTC)
+    _NOW_BEFORE = datetime(2026, 6, 25, 22, 30, 0, tzinfo=UTC)
+    # June 25 23:10 UTC = June 26 01:10 AMS (after settlement threshold 23:05 UTC)
+    _NOW_AFTER = datetime(2026, 6, 25, 23, 10, 0, tzinfo=UTC)
+
+    def _setup_single_version_contract(self, session: Session) -> None:
+        """Insert a manual contract effective Jan 1 2026 (covers all test dates)."""
+        c = _make_contract(session, kind="manual", active=True)
+        _make_version(session, c, _MANUAL_VALUES, effective_from=_ams_midnight(2026, 1, 1))
+        session.commit()
+
+    def _run(
+        self,
+        session: Session,
+        start_utc: datetime,
+        end_utc: datetime,
+        *,
+        now_utc: datetime,
+    ) -> dict:
+        """Run summarize with AMS timezone and pinned local_now.
+
+        *now_utc* is converted to AMS before being used as the ``local_now``
+        return value, so ``.date()`` yields the correct AMS local date.
+        """
+        from unittest.mock import patch
+        import app.services.energy_cost as _ec
+
+        now_ams = now_utc.astimezone(_ams())
+        with patch.object(tz_module, "local_tz", return_value=_ams()):
+            with patch.object(_ec, "local_now", return_value=now_ams):
+                return summarize(session, start_utc, end_utc)
+
+    # --- AC1: before 01:05 → today not settled → fixed_costs/credits == 0 ---
+
+    def test_today_window_before_offset_yields_zero(self, energy_db: Session) -> None:
+        """AC1: At local 00:30 (before 01:05), today's window → credits == 0 and fixed_costs == 0.
+
+        Window: [June 26 AMS midnight, June 27 AMS midnight).
+        now = June 26 00:30 AMS (before 01:05) → settled_cap = June 25.
+        first_counted = June 26 > last_counted = June 25 → 0 days.
+        """
+        self._setup_single_version_contract(energy_db)
+        start = _ams_midnight(2026, 6, 26)   # June 25 22:00 UTC
+        end = _ams_midnight(2026, 6, 27)     # June 26 22:00 UTC
+
+        result = self._run(energy_db, start, end, now_utc=self._NOW_BEFORE)
+
+        assert result["fixed_costs"] == 0.0, (
+            "AC1: before settlement offset, today's fixed_costs must be 0; "
+            f"got {result['fixed_costs']}"
+        )
+        assert result["credits"] == 0.0, (
+            "AC1: before settlement offset, today's credits must be 0; "
+            f"got {result['credits']}"
+        )
+
+    # --- AC2: >= 01:05 → today settled → 1 day fixed/credits ---
+
+    def test_today_window_after_offset_yields_one_day(self, energy_db: Session) -> None:
+        """AC2: At local 01:10 (>= 01:05), today's window → 1 day of fixed/credits.
+
+        Window: [June 26 AMS midnight, June 27 AMS midnight).
+        now = June 26 01:10 AMS (after 01:05) → settled_cap = June 26.
+        first_counted = June 26 = last_counted → 1 day.
+        """
+        self._setup_single_version_contract(energy_db)
+        start = _ams_midnight(2026, 6, 26)
+        end = _ams_midnight(2026, 6, 27)
+
+        result = self._run(energy_db, start, end, now_utc=self._NOW_AFTER)
+
+        daily_fixed = (9.87 + 9.87) / 30
+        daily_credit = 600.0 / 365
+        assert abs(result["fixed_costs"] - daily_fixed) < 1e-9, (
+            "AC2: after settlement offset, today's fixed_costs must equal 1 day; "
+            f"expected {daily_fixed:.6f}, got {result['fixed_costs']}"
+        )
+        assert abs(result["credits"] - daily_credit) < 1e-9, (
+            "AC2: after settlement offset, today's credits must equal 1 day; "
+            f"expected {daily_credit:.6f}, got {result['credits']}"
+        )
+
+    # --- AC3a: cumulative window, before offset → today (June 26) not counted ---
+
+    def test_cumulative_before_offset_excludes_today(self, energy_db: Session) -> None:
+        """AC3: Cumulative window at 00:30 (before offset) excludes today from count.
+
+        Window: [June 24 AMS midnight, June 26 00:30 AMS).
+          first_counted = June 24.
+          last_counted (from window) = June 26 (lmu(June 26) = June 25 22:00 < 22:30).
+          settled_cap = June 25 (before offset) → min(June 26, June 25) = June 25.
+          Counted: June 24 + June 25 = 2 days (today June 26 excluded).
+        """
+        self._setup_single_version_contract(energy_db)
+        start = _ams_midnight(2026, 6, 24)   # June 23 22:00 UTC
+        end = self._NOW_BEFORE               # June 25 22:30 UTC = June 26 00:30 AMS
+
+        result = self._run(energy_db, start, end, now_utc=self._NOW_BEFORE)
+
+        daily_fixed = (9.87 + 9.87) / 30
+        daily_credit = 600.0 / 365
+        assert abs(result["fixed_costs"] - daily_fixed * 2) < 1e-9, (
+            "AC3 before offset: today (June 26) must not be counted; expected 2 days; "
+            f"got {result['fixed_costs']}"
+        )
+        assert abs(result["credits"] - daily_credit * 2) < 1e-9, (
+            "AC3 before offset: credits must be 2 days; "
+            f"got {result['credits']}"
+        )
+
+    # --- AC3b: cumulative window, after offset → today (June 26) counted ---
+
+    def test_cumulative_after_offset_includes_today(self, energy_db: Session) -> None:
+        """AC3: Cumulative window at 01:10 (after offset) includes today.
+
+        Window: [June 24 AMS midnight, June 26 01:10 AMS).
+          first_counted = June 24.
+          last_counted (from window) = June 26 (lmu(June 26) < 23:10 UTC).
+          settled_cap = June 26 (after offset) → last_counted = June 26.
+          Counted: June 24 + June 25 + June 26 = 3 days.
+        """
+        self._setup_single_version_contract(energy_db)
+        start = _ams_midnight(2026, 6, 24)   # June 23 22:00 UTC
+        end = self._NOW_AFTER               # June 25 23:10 UTC = June 26 01:10 AMS
+
+        result = self._run(energy_db, start, end, now_utc=self._NOW_AFTER)
+
+        daily_fixed = (9.87 + 9.87) / 30
+        daily_credit = 600.0 / 365
+        assert abs(result["fixed_costs"] - daily_fixed * 3) < 1e-9, (
+            "AC3 after offset: today (June 26) must be counted; expected 3 days; "
+            f"got {result['fixed_costs']}"
+        )
+        assert abs(result["credits"] - daily_credit * 3) < 1e-9, (
+            "AC3 after offset: credits must be 3 days; "
+            f"got {result['credits']}"
+        )
+
+    # --- AC4: past days always fully counted regardless of offset ---
+
+    def test_past_days_always_counted_regardless_of_offset(self, energy_db: Session) -> None:
+        """AC4: Past days (all before today) are fully counted even before 01:05.
+
+        Window: [June 20 AMS midnight, June 26 AMS midnight) — all before today.
+        now = June 26 00:30 AMS (before offset) → settled_cap = June 25.
+        last_counted (from window) = June 25 (lmu(June 26) = end_utc, not <).
+        min(June 25, June 25) = June 25 → 6 days (June 20-25), all past.
+        """
+        self._setup_single_version_contract(energy_db)
+        start = _ams_midnight(2026, 6, 20)   # June 19 22:00 UTC
+        end = _ams_midnight(2026, 6, 26)     # June 25 22:00 UTC
+
+        result = self._run(energy_db, start, end, now_utc=self._NOW_BEFORE)
+
+        daily_fixed = (9.87 + 9.87) / 30
+        daily_credit = 600.0 / 365
+        # June 20-25 = 6 days, all past — unaffected by settlement offset.
+        assert abs(result["fixed_costs"] - daily_fixed * 6) < 1e-9, (
+            "AC4: past days must be fully counted regardless of settlement offset; "
+            f"expected 6 days = {daily_fixed * 6:.6f}, got {result['fixed_costs']}"
+        )
+        assert abs(result["credits"] - daily_credit * 6) < 1e-9, (
+            "AC4: past credits must be 6 days; "
+            f"got {result['credits']}"
+        )
+
+    # --- AC5: cross-version segments still correct with settlement offset ---
+
+    def test_cross_version_with_settlement_offset(self, energy_db: Session) -> None:
+        """AC5: Cross-version day split is correct when settlement offset is active.
+
+        V1 covers June 24; V2 covers June 25+.
+        Window: [June 24 AMS midnight, June 26 01:10 AMS).
+        After offset (01:10) → settled_cap = June 26 → 3 days: V1=1, V2=2.
+
+        V1: network_fee=6, management_fee=6 → daily_fixed = 12/30
+            heffingskorting=300           → daily_credit = 300/365
+        V2: network_fee=12, management_fee=12 → daily_fixed = 24/30
+            heffingskorting=600            → daily_credit = 600/365
+
+        Expected:
+          fixed_costs = 1×(12/30) + 2×(24/30) = 0.4 + 1.6 = 2.0
+          credits     = 1×(300/365) + 2×(600/365) = 1500/365
+        """
+        _VALUES_V1 = {
+            "energy": {"buy": {"normal": 0.10, "dal": 0.10},
+                       "sell": {"normal": 0.05, "dal": 0.05},
+                       "energy_tax": 0.0, "ode": 0.0},
+            "standing": {"network_fee": 6.0, "management_fee": 6.0},
+            "credits": {"heffingskorting": 300.0},
+        }
+        _VALUES_V2 = {
+            "energy": {"buy": {"normal": 0.20, "dal": 0.20},
+                       "sell": {"normal": 0.08, "dal": 0.08},
+                       "energy_tax": 0.0, "ode": 0.0},
+            "standing": {"network_fee": 12.0, "management_fee": 12.0},
+            "credits": {"heffingskorting": 600.0},
+        }
+        v1_from = _ams_midnight(2026, 6, 24)   # June 23 22:00 UTC
+        v2_from = _ams_midnight(2026, 6, 25)   # June 24 22:00 UTC
+
+        c = _make_contract(energy_db, kind="manual", active=True)
+        _make_version(energy_db, c, _VALUES_V1, effective_from=v1_from, effective_to=v2_from)
+        _make_version(energy_db, c, _VALUES_V2, effective_from=v2_from)
+        energy_db.commit()
+
+        start = _ams_midnight(2026, 6, 24)   # June 23 22:00 UTC
+        end = self._NOW_AFTER               # June 25 23:10 UTC = June 26 01:10 AMS
+
+        result = self._run(energy_db, start, end, now_utc=self._NOW_AFTER)
+
+        expected_fixed = 1 * 12 / 30 + 2 * 24 / 30    # V1: 1 day, V2: 2 days
+        expected_credits = 1 * 300 / 365 + 2 * 600 / 365
+        assert abs(result["fixed_costs"] - expected_fixed) < 1e-9, (
+            f"AC5: cross-version fixed_costs wrong; expected {expected_fixed}, "
+            f"got {result['fixed_costs']}"
+        )
+        assert abs(result["credits"] - expected_credits) < 1e-9, (
+            f"AC5: cross-version credits wrong; expected {expected_credits}, "
+            f"got {result['credits']}"
+        )
+
+    # --- AC6: return dict key-set unchanged ---
+
+    def test_return_dict_keys_unchanged(self, energy_db: Session) -> None:
+        """AC6: summarize() return dict keys are unchanged by the settlement offset."""
+        self._setup_single_version_contract(energy_db)
+        start = _ams_midnight(2026, 6, 26)
+        end = _ams_midnight(2026, 6, 27)
+
+        result = self._run(energy_db, start, end, now_utc=self._NOW_AFTER)
+
+        expected_keys = {
+            "currency", "metered_import", "metered_export", "metered_net",
+            "fixed_costs", "credits", "total_payable", "period_count",
+            "degraded_count", "days",
+        }
+        assert set(result.keys()) == expected_keys, (
+            f"AC6: summarize() key set changed; expected {expected_keys}, "
+            f"got {set(result.keys())}"
+        )

tests/test_energy_expose.py

@@ -1729,10 +1729,13 @@ def test_import_cost_today_getter_uses_local_day_window(energy_db) -> None:
     """FU11: import_cost_today getter returns value for today's local window.
 
     Setup: period at local 'today' (within today's UTC window), active contract.
-    Timezone pinned to UTC. Verifies: value = metered_import + fixed_costs for 1 day
+    Timezone pinned to UTC, local_now pinned to 2026-06-26 12:00:00 UTC (deterministic midday).
+    Verifies: value = metered_import + fixed_costs for 1 day
     (Principle C: today counts as elapsed if we're past local midnight — which UTC is).
 
     FUE-T05: provider requires an active electricity meter.
+    FUE-T09: local_now pinned (not real time) to eliminate the ~5s flaky window introduced
+    by the grace period: (local_now()-5s).date() is unpredictable near UTC 00:00:00–00:00:04.
     """
     from datetime import timedelta
     from unittest.mock import patch
@@ -1740,17 +1743,16 @@ def test_import_cost_today_getter_uses_local_day_window(energy_db) -> None:
     from app.integrations.expose import build_catalog
     from app.services import timezone as _tz_mod
 
-    now_utc = datetime.now(timezone.utc)
-    # Place a period in today's window (1 hour ago, well within today UTC midnight→tomorrow)
-    # When TZ=UTC, local today = UTC today, so a period 1h ago is in today's window.
-    t0 = now_utc.replace(minute=0, second=0, microsecond=0) - timedelta(hours=1)
-    # Ensure t0 is still today UTC (handle edge case where now is < 1h past UTC midnight)
-    if t0.date() < now_utc.date():
-        t0 = now_utc.replace(hour=0, minute=0, second=0, microsecond=0)
+    # Pin to a deterministic midday moment — (fake_now - 5s).date() == fake_now.date() always.
+    fake_now = datetime(2026, 6, 26, 12, 0, 0, tzinfo=timezone.utc)
+    today_midnight = fake_now.replace(hour=0, minute=0, second=0, microsecond=0)
+
+    # Place a period 1 hour before fake_now — well within today's [midnight, tomorrow midnight).
+    t0 = fake_now.replace(hour=11, minute=0, second=0, microsecond=0)
 
     # Contract starting well before today
-    effective_from = now_utc.replace(hour=0, minute=0, second=0, microsecond=0) - timedelta(days=30)
-    meter_start = now_utc.replace(hour=0, minute=0, second=0, microsecond=0) - timedelta(days=30)
+    effective_from = today_midnight - timedelta(days=30)
+    meter_start = today_midnight - timedelta(days=30)
 
     import_cost_today = 1.23
 
@@ -1766,8 +1768,12 @@ def test_import_cost_today_getter_uses_local_day_window(energy_db) -> None:
         session.commit()
 
     with Session(energy_db) as session:
-        # Pin timezone to UTC so today_local = UTC date (deterministic on any CI host).
-        with patch.object(_tz_mod, "local_tz", return_value=ZoneInfo("UTC")):
+        # Pin both local_tz (UTC) and local_now (deterministic midday) so the today window
+        # is always [2026-06-26 00:00:00 UTC, 2026-06-27 00:00:00 UTC), regardless of CI clock.
+        with (
+            patch.object(_tz_mod, "local_tz", return_value=ZoneInfo("UTC")),
+            patch.object(_tz_mod, "local_now", return_value=fake_now),
+        ):
             catalog = build_catalog(session)
             today_entry = next(
                 e for e in catalog if e.entity.key == "energy.import_cost_today"
@@ -1789,6 +1795,8 @@ def test_export_revenue_today_getter_uses_local_day_window(energy_db) -> None:
     """FU11: export_revenue_today getter returns value for today's local window.
 
     FUE-T05: provider requires an active electricity meter.
+    FUE-T09: local_now pinned (not real time) to eliminate the ~5s flaky window introduced
+    by the grace period: (local_now()-5s).date() is unpredictable near UTC 00:00:00–00:00:04.
     """
     from datetime import timedelta
     from unittest.mock import patch
@@ -1796,13 +1804,15 @@ def test_export_revenue_today_getter_uses_local_day_window(energy_db) -> None:
     from app.integrations.expose import build_catalog
     from app.services import timezone as _tz_mod
 
-    now_utc = datetime.now(timezone.utc)
-    t0 = now_utc.replace(minute=0, second=0, microsecond=0) - timedelta(hours=1)
-    if t0.date() < now_utc.date():
-        t0 = now_utc.replace(hour=0, minute=0, second=0, microsecond=0)
+    # Pin to a deterministic midday moment — (fake_now - 5s).date() == fake_now.date() always.
+    fake_now = datetime(2026, 6, 26, 12, 0, 0, tzinfo=timezone.utc)
+    today_midnight = fake_now.replace(hour=0, minute=0, second=0, microsecond=0)
 
-    effective_from = now_utc.replace(hour=0, minute=0, second=0, microsecond=0) - timedelta(days=30)
-    meter_start = now_utc.replace(hour=0, minute=0, second=0, microsecond=0) - timedelta(days=30)
+    # Place a period 1 hour before fake_now — well within today's [midnight, tomorrow midnight).
+    t0 = fake_now.replace(hour=11, minute=0, second=0, microsecond=0)
+
+    effective_from = today_midnight - timedelta(days=30)
+    meter_start = today_midnight - timedelta(days=30)
     export_today = 0.75
 
     with Session(energy_db) as session:
@@ -1817,7 +1827,12 @@ def test_export_revenue_today_getter_uses_local_day_window(energy_db) -> None:
         session.commit()
 
     with Session(energy_db) as session:
-        with patch.object(_tz_mod, "local_tz", return_value=ZoneInfo("UTC")):
+        # Pin both local_tz (UTC) and local_now (deterministic midday) so the today window
+        # is always [2026-06-26 00:00:00 UTC, 2026-06-27 00:00:00 UTC), regardless of CI clock.
+        with (
+            patch.object(_tz_mod, "local_tz", return_value=ZoneInfo("UTC")),
+            patch.object(_tz_mod, "local_now", return_value=fake_now),
+        ):
             catalog = build_catalog(session)
             today_entry = next(
                 e for e in catalog if e.entity.key == "energy.export_revenue_today"
@@ -2468,3 +2483,205 @@ def test_energy_cost_identifiers_change_after_meter_swap(energy_db) -> None:
         assert entity.device.identifiers[1] != old_uuid, (
             f"After swap, old uuid {old_uuid!r} must not appear in identifiers"
         )
+
+
+# ---------------------------------------------------------------------------
+# FUE-T09: *_today grace — window selection at / around local midnight
+# ---------------------------------------------------------------------------
+#
+# Strategy: patch local_now + local_tz (to UTC) and spy on summarize to capture
+# the start/end arguments.  Verifies that the 5-second grace means:
+#   - 00:00:03 → today_local = yesterday   (grace not yet elapsed)
+#   - 00:00:12 → today_local = today       (grace elapsed)
+#   - 12:00:00 → today_local = today       (midday, unaffected)
+
+
+def _spy_summarize_factory(captured: dict):
+    """Return a summarize spy that records start/end and returns a zero-value dict."""
+    def _spy(sess, start, end):
+        captured["start"] = start
+        captured["end"] = end
+        return {"metered_import": 0.0, "fixed_costs": 0.0, "metered_export": 0.0, "credits": 0.0}
+    return _spy
+
+
+def _setup_grace_db(energy_db) -> None:
+    """Insert active meter + active contract + one non-degraded period for grace tests."""
+    anchor = datetime(2026, 6, 25, 0, 0, 0, tzinfo=timezone.utc)
+    with Session(energy_db) as session:
+        _make_active_meter(session, started_at=anchor, label="Grace Test Meter")
+        _make_contract_with_version(
+            session,
+            values=_STANDING_VALUES,
+            effective_from=anchor,
+            active=True,
+        )
+        _make_period(session, period_start=anchor, import_cost=1.0, export_revenue=0.5, degraded=False)
+        session.commit()
+
+
+def test_today_getter_grace_uses_yesterday_window_at_00_00_03(energy_db) -> None:
+    """FUE-T09 AC1a: at local 00:00:03 (< grace=5s), both today getters use YESTERDAY's window.
+
+    With grace=5s, (local_now() - 5s) = 2026-06-25 23:59:58, so today_local = 2026-06-25
+    (yesterday).  summarize must be called with start = 2026-06-25 00:00:00 UTC.
+    Verifies both import and export today getters.
+    """
+    from unittest.mock import patch
+    from zoneinfo import ZoneInfo
+    from app.integrations.expose import build_catalog
+    from app.services import timezone as _tz_mod
+
+    _setup_grace_db(energy_db)
+
+    # 2026-06-26 00:00:03 UTC — 3 seconds past midnight, still within 5-second grace.
+    fake_now = datetime(2026, 6, 26, 0, 0, 3, tzinfo=timezone.utc)
+
+    captured_import: dict = {}
+    captured_export: dict = {}
+
+    with Session(energy_db) as session:
+        with (
+            patch.object(_tz_mod, "local_tz", return_value=ZoneInfo("UTC")),
+            patch.object(_tz_mod, "local_now", return_value=fake_now),
+            patch("app.services.energy_cost.summarize", side_effect=_spy_summarize_factory(captured_import)),
+        ):
+            catalog = build_catalog(session)
+            import_entry = next(e for e in catalog if e.entity.key == "energy.import_cost_today")
+            import_entry.entity.value_getter(session)
+
+    # Reset and test export getter (separate patch context so we get a fresh spy dict)
+    captured_export = {}
+    with Session(energy_db) as session:
+        with (
+            patch.object(_tz_mod, "local_tz", return_value=ZoneInfo("UTC")),
+            patch.object(_tz_mod, "local_now", return_value=fake_now),
+            patch("app.services.energy_cost.summarize", side_effect=_spy_summarize_factory(captured_export)),
+        ):
+            catalog = build_catalog(session)
+            export_entry = next(e for e in catalog if e.entity.key == "energy.export_revenue_today")
+            export_entry.entity.value_getter(session)
+
+    # Grace not elapsed: today_local = 2026-06-25 (yesterday), so window starts there.
+    expected_start = datetime(2026, 6, 25, 0, 0, 0, tzinfo=timezone.utc)
+    assert captured_import.get("start") == expected_start, (
+        f"import_cost_today at 00:00:03: window start must be yesterday ({expected_start}), "
+        f"got {captured_import.get('start')}"
+    )
+    assert captured_export.get("start") == expected_start, (
+        f"export_revenue_today at 00:00:03: window start must be yesterday ({expected_start}), "
+        f"got {captured_export.get('start')}"
+    )
+
+
+def test_today_getter_grace_uses_today_window_at_00_00_12(energy_db) -> None:
+    """FUE-T09 AC1b: at local 00:00:12 (> grace=5s), both today getters use TODAY's window.
+
+    With grace=5s, (local_now() - 5s) = 2026-06-26 00:00:07, so today_local = 2026-06-26
+    (today).  summarize must be called with start = 2026-06-26 00:00:00 UTC.
+    """
+    from unittest.mock import patch
+    from zoneinfo import ZoneInfo
+    from app.integrations.expose import build_catalog
+    from app.services import timezone as _tz_mod
+
+    _setup_grace_db(energy_db)
+
+    # 2026-06-26 00:00:12 UTC — 12 seconds past midnight, beyond the 5-second grace.
+    fake_now = datetime(2026, 6, 26, 0, 0, 12, tzinfo=timezone.utc)
+
+    captured_import: dict = {}
+    captured_export: dict = {}
+
+    with Session(energy_db) as session:
+        with (
+            patch.object(_tz_mod, "local_tz", return_value=ZoneInfo("UTC")),
+            patch.object(_tz_mod, "local_now", return_value=fake_now),
+            patch("app.services.energy_cost.summarize", side_effect=_spy_summarize_factory(captured_import)),
+        ):
+            catalog = build_catalog(session)
+            import_entry = next(e for e in catalog if e.entity.key == "energy.import_cost_today")
+            import_entry.entity.value_getter(session)
+
+    captured_export = {}
+    with Session(energy_db) as session:
+        with (
+            patch.object(_tz_mod, "local_tz", return_value=ZoneInfo("UTC")),
+            patch.object(_tz_mod, "local_now", return_value=fake_now),
+            patch("app.services.energy_cost.summarize", side_effect=_spy_summarize_factory(captured_export)),
+        ):
+            catalog = build_catalog(session)
+            export_entry = next(e for e in catalog if e.entity.key == "energy.export_revenue_today")
+            export_entry.entity.value_getter(session)
+
+    # Grace elapsed: today_local = 2026-06-26 (today), window starts there.
+    expected_start = datetime(2026, 6, 26, 0, 0, 0, tzinfo=timezone.utc)
+    assert captured_import.get("start") == expected_start, (
+        f"import_cost_today at 00:00:12: window start must be today ({expected_start}), "
+        f"got {captured_import.get('start')}"
+    )
+    assert captured_export.get("start") == expected_start, (
+        f"export_revenue_today at 00:00:12: window start must be today ({expected_start}), "
+        f"got {captured_export.get('start')}"
+    )
+
+
+def test_today_getter_grace_unaffected_at_midday(energy_db) -> None:
+    """FUE-T09 AC2: at 12:00, grace doesn't shift the window — today_local still = today.
+
+    Well past midnight, (local_now() - 5s).date() == local_now().date() always.
+    """
+    from unittest.mock import patch
+    from zoneinfo import ZoneInfo
+    from app.integrations.expose import build_catalog
+    from app.services import timezone as _tz_mod
+
+    _setup_grace_db(energy_db)
+
+    # 2026-06-26 12:00:00 UTC — midday.
+    fake_now = datetime(2026, 6, 26, 12, 0, 0, tzinfo=timezone.utc)
+
+    captured: dict = {}
+
+    with Session(energy_db) as session:
+        with (
+            patch.object(_tz_mod, "local_tz", return_value=ZoneInfo("UTC")),
+            patch.object(_tz_mod, "local_now", return_value=fake_now),
+            patch("app.services.energy_cost.summarize", side_effect=_spy_summarize_factory(captured)),
+        ):
+            catalog = build_catalog(session)
+            import_entry = next(e for e in catalog if e.entity.key == "energy.import_cost_today")
+            import_entry.entity.value_getter(session)
+
+    # At 12:00 the grace (5s) does not push the date back: today_local = 2026-06-26.
+    expected_start = datetime(2026, 6, 26, 0, 0, 0, tzinfo=timezone.utc)
+    assert captured.get("start") == expected_start, (
+        f"import_cost_today at 12:00: window start must be today ({expected_start}), "
+        f"got {captured.get('start')}"
+    )
+
+
+def test_midnight_state_publish_no_raise_when_mqtt_disabled() -> None:
+    """FUE-T09 AC3: _run_midnight_state_publish is safe when MQTT is disabled.
+
+    _run_midnight_state_publish delegates to publish_states, which is internally
+    guarded (_should_publish returns False when MQTT is disabled or not connected).
+    This test verifies publish_states itself doesn't raise under those conditions —
+    the job's try/except swallows any other exception as well.
+    """
+    settings = _make_settings(mqtt_enabled=False)
+    mock_mgr = _make_mock_manager(is_connected=False)
+
+    with (
+        patch("app.services.ha_discovery.build_runtime_settings", return_value=settings),
+        patch("app.services.ha_discovery.mqtt_manager", mock_mgr),
+    ):
+        from app.services.ha_discovery import publish_states
+        from sqlalchemy import create_engine as _ce
+        from sqlalchemy.orm import Session as _S
+
+        eng = _ce("sqlite:///:memory:")
+        with _S(eng) as sess:
+            publish_states(sess)  # must not raise
+
+    mock_mgr.publish.assert_not_called()