fix: Add missing commas in function calls and improve code formatting

tests/services/test_dashboard.py

@@ -1,6 +1,6 @@
 """Tests for dashboard service."""
 
-from datetime import UTC, datetime, timedelta
+from datetime import UTC, datetime
 from unittest.mock import AsyncMock, Mock, patch
 
 import pytest
@@ -63,7 +63,7 @@ class TestDashboardService:
     ):
         """Test getting soundboard statistics with exception."""
         mock_sound_repository.get_soundboard_statistics = AsyncMock(
-            side_effect=Exception("Database error")
+            side_effect=Exception("Database error"),
         )
 
         with pytest.raises(Exception, match="Database error"):
@@ -105,7 +105,7 @@ class TestDashboardService:
     ):
         """Test getting track statistics with exception."""
         mock_sound_repository.get_track_statistics = AsyncMock(
-            side_effect=Exception("Database error")
+            side_effect=Exception("Database error"),
         )
 
         with pytest.raises(Exception, match="Database error"):
@@ -198,7 +198,7 @@ class TestDashboardService:
     ):
         """Test getting top sounds with exception."""
         mock_sound_repository.get_top_sounds = AsyncMock(
-            side_effect=Exception("Database error")
+            side_effect=Exception("Database error"),
         )
 
         with pytest.raises(Exception, match="Database error"):
@@ -274,4 +274,4 @@ class TestDashboardService:
     def test_get_date_filter_unknown_period(self, dashboard_service):
         """Test date filter for unknown period."""
         result = dashboard_service._get_date_filter("unknown_period")
-        assert result is None
+        assert result is None