fix: route leaderboards rank by moving time not elapsed — top-10 route times and route completions list now use COALESCE(moving_time_s, duration_s) so mid-activity pauses don't inflate times (consistent with moving-time avg pace)

backend/app/api/routes.py

@@ -195,11 +195,13 @@ async def route_activities(
     db: AsyncSession = Depends(get_db),
     current_user: User = Depends(get_current_user),
 ):
+    # Rank by moving time (pauses excluded), falling back to elapsed for
+    # activities without it — consistent with avg pace being moving-time based.
     result = await db.execute(
         select(Activity).where(
             Activity.named_route_id == route_id,
             Activity.user_id == current_user.id,
-        ).order_by(Activity.duration_s)
+        ).order_by(func.coalesce(Activity.moving_time_s, Activity.duration_s))
     )
     activities = result.scalars().all()
     return [
@@ -207,7 +209,7 @@ async def route_activities(
             "id": a.id,
             "name": a.name,
             "start_time": a.start_time,
-            "duration_s": a.duration_s,
+            "duration_s": a.moving_time_s or a.duration_s,
             "distance_m": a.distance_m,
             "avg_heart_rate": a.avg_heart_rate,
             "avg_speed_ms": a.avg_speed_ms,