fix: preserve deadline calendar days (Closes #719)

src/push_notifications.py

@@ -306,20 +306,17 @@ async def _dispatch_deadline_reminders_unlocked(
     snapshot = await assigned()
     if snapshot.get("complete") is False:
         return 0
-    due_cutoff = current + timedelta(hours=48)
-    due_count = 0
+    due_days = []
     for item in snapshot.get("items", []):
         if not isinstance(item, dict) or not item.get("due_date"):
             continue
+        raw_due = str(item["due_date"])
         try:
-            due = datetime.fromisoformat(str(item["due_date"]).replace("Z", "+00:00"))
+            due_day = datetime.strptime(raw_due[:10], "%Y-%m-%d").date()
         except ValueError:
             continue
-        if due.tzinfo is None:
-            due = due.replace(tzinfo=timezone.utc)
-        if due <= due_cutoff:
-            due_count += 1
-    if not due_count:
+        due_days.append(due_day)
+    if not due_days:
         return 0
     semaphore = asyncio.Semaphore(max(1, max_concurrency))
 
@@ -335,6 +332,10 @@ async def _dispatch_deadline_reminders_unlocked(
                 or device.delivered_local_day == local_day
             ):
                 return 0
+            local_cutoff = local_now.date() + timedelta(days=2)
+            due_count = sum(due_day <= local_cutoff for due_day in due_days)
+            if not due_count:
+                return 0
             if session_active is not None and not await session_active(device.session_id):
                 await asyncio.to_thread(store.delete_session, device.session_id)
                 return 0