Fix quarter_hour support

Author: azvoleff

gefapi/routes/api/v1/stats.py

@@ -193,7 +193,7 @@ def get_execution_stats():
 
     Query Parameters:
     - period: Time period filter (last_day, last_week, last_month, last_year, all)
-    - group_by: Grouping interval (hour, day, week, month)
+    - group_by: Grouping interval (quarter_hour, hour, day, week, month)
     - task_type: Filter by specific task type
     - status: Filter by execution status (PENDING, RUNNING, FINISHED, FAILED, CANCELLED)
 
@@ -270,7 +270,7 @@ def get_execution_stats():
                 detail=f"Invalid period. Must be one of: {', '.join(valid_periods)}",
             )
 
-        valid_group_by = ["hour", "day", "week", "month"]
+        valid_group_by = ["quarter_hour", "hour", "day", "week", "month"]
         if group_by not in valid_group_by:
             return error(
                 status=400,

tests/routes/api/v1/test_stats.py

@@ -331,6 +331,28 @@ def test_execution_stats_with_filters(
             status="FINISHED",
         )
 
+    @patch("gefapi.utils.permissions.is_superadmin")
+    @patch.object(StatsService, "get_execution_stats")
+    def test_execution_stats_quarter_hour_group_by(
+        self, mock_get_stats, mock_is_superadmin, client, auth_headers_superadmin
+    ):
+        """Execution stats should accept quarter-hour grouping."""
+        mock_is_superadmin.return_value = True
+        mock_get_stats.return_value = self.sample_execution_stats
+
+        response = client.get(
+            "/api/v1/stats/executions?period=last_day&group_by=quarter_hour",
+            headers=auth_headers_superadmin,
+        )
+
+        assert response.status_code == 200
+        mock_get_stats.assert_called_once_with(
+            period="last_day",
+            group_by="quarter_hour",
+            task_type=None,
+            status=None,
+        )
+
     @patch("gefapi.utils.permissions.is_superadmin")
     def test_execution_stats_invalid_status(
         self, mock_is_superadmin, client, auth_headers_superadmin