fix(api): tests live count

api/chalicelib/core/usability_testing/service.py

@@ -117,13 +117,15 @@ def get_ut_test(project_id: int, test_id: int):
     """
 
     live_count_sql = """
-        SELECT COUNT(*) FROM (
+        WITH RankedSessions AS (
-            SELECT DISTINCT ON (uts.session_id) uts.test_id
+            SELECT *,
-            FROM ut_tests_signals uts
+                   ROW_NUMBER() OVER (PARTITION BY session_id ORDER BY timestamp DESC) as rn
-            WHERE uts.duration IS NULL AND uts.task_id IS NULL
+            FROM ut_tests_signals
-            ORDER BY uts.session_id, uts.timestamp DESC
+            WHERE test_id = %(test_id)s AND task_id IS NULL
-        ) AS latest_signals
+        )
-        WHERE latest_signals.test_id = ut.test_id
+        SELECT COUNT(DISTINCT session_id) AS live_count
+        FROM RankedSessions
+        WHERE rn = 1 AND status = 'begin'
     """
 
     select_columns = [