M39: harden application and acceptance gates

backend/app/api/routers/dashboard.py

@@ -1,7 +1,8 @@
 from __future__ import annotations
 
-from datetime import UTC, date, datetime
+from datetime import date, datetime
 from typing import Literal
+from zoneinfo import ZoneInfo
 
 from fastapi import APIRouter, Depends
 from sqlalchemy import select
@@ -30,10 +31,20 @@ settings = get_settings()
 _SEVERITY_ORDER = {"high": 0, "medium": 1, "low": 2}
 
 
+def _local_tz() -> ZoneInfo:
+    return ZoneInfo(settings.demo_timezone)
+
+
 def _today() -> date:
     # Seeded dates are shifted to the real reset moment by `seed_loader.py`'s anchor
     # shift, so "today" must be real wall-clock time, not the frozen `demo_today` setting.
-    return datetime.now(UTC).date()
+    # Timestamps are stored in UTC but the operational day is the local (Europe/Brussels)
+    # calendar day, so a 23:30Z departure belongs to tomorrow's schedule in summer.
+    return datetime.now(_local_tz()).date()
+
+
+def _local_date(value: datetime) -> date:
+    return value.astimezone(_local_tz()).date()
 
 
 @router.get("", response_model=DashboardOut)
@@ -97,7 +108,7 @@ def get_dashboard(
     for b in bookings:
         vehicle = vehicles_by_id.get(b.vehicle_id)
         vehicle_ref = vehicle.public_ref if vehicle else ""
-        if b.starts_at.date() == today and b.status in ("reserved", "active"):
+        if _local_date(b.starts_at) == today and b.status in ("reserved", "active"):
             today_items.append(
                 TodayItem(
                     kind="departure",
@@ -106,7 +117,7 @@ def get_dashboard(
                     scheduled_at=b.starts_at,
                 )
             )
-        if b.ends_at.date() == today and b.status in ("active", "returned"):
+        if _local_date(b.ends_at) == today and b.status in ("active", "returned"):
             today_items.append(
                 TodayItem(
                     kind="return",