diff --git a/app/services/cadence.py b/app/services/cadence.py
index 866b4c9..b3c6127 100644
--- a/app/services/cadence.py
+++ b/app/services/cadence.py
@@ -18,11 +18,17 @@ from datetime import datetime, timezone
 
 @dataclass(frozen=True)
 class CadencePolicy:
-    # Active window in UTC. LSE opens 07:00 BST → 07:00 UTC summer, 08:00 UTC
-    # winter. NYSE closes 16:00 ET → 21:00 UTC summer, 21:00 UTC winter. The
-    # combined EU/US trading window is well covered by 07:00-21:00 UTC.
-    active_start_hour: int = 7
-    active_end_hour: int = 21
+    # Active trading windows in UTC. A timestamp is "active" if its hour
+    # falls in ANY listed window. Add or remove tuples to change coverage.
+    #
+    # LSE opens 07:00 BST → 07:00 UTC summer / 08:00 UTC winter.
+    # NYSE closes 16:00 ET → 21:00 UTC summer / 21:00 UTC winter.
+    # Tokyo trades 09:00-15:00 JST → 00:00-06:00 UTC.
+    # HK/Shanghai trade 09:30-16:00 local → 01:30-08:00 UTC.
+    active_windows: tuple[tuple[int, int], ...] = (
+        (7, 21),    # EU/US (LSE open through NYSE close)
+        # (0, 8),   # Asia (Tokyo + HK/Shanghai) — uncomment to add
+    )
     # Minimum gap between successful runs outside the active window.
     off_hours_gap_h: float = 4.0
     weekend_gap_h: float = 12.0
@@ -31,7 +37,7 @@ class CadencePolicy:
         now = now or datetime.now(timezone.utc)
         if now.weekday() >= 5:  # Saturday / Sunday
             return False
-        return self.active_start_hour <= now.hour < self.active_end_hour
+        return any(start <= now.hour < end for start, end in self.active_windows)
 
     def min_gap_hours(self, now: datetime | None = None) -> float:
         now = now or datetime.now(timezone.utc)