diff --git a/benchmark/gui/TGUI46_job_failure_triage_workmail_sms_notes/fixtures/scheduler/jobs.json b/benchmark/gui/TGUI46_job_failure_triage_workmail_sms_notes/fixtures/scheduler/jobs.json
index 2977f61..3e08444 100644
--- a/benchmark/gui/TGUI46_job_failure_triage_workmail_sms_notes/fixtures/scheduler/jobs.json
+++ b/benchmark/gui/TGUI46_job_failure_triage_workmail_sms_notes/fixtures/scheduler/jobs.json
@@ -192,13 +192,13 @@
     ]
   },
   {
-    "job_id": "JOB-705",
+    "job_id": "JOB-712",
     "name": "db_migration_user_preferences",
-    "description": "Database migration to add user preferences schema for rate-limiting feature",
-    "cron_expression": "",
+    "description": "One-time database migration to add user preferences schema for rate-limiting feature",
+    "cron_expression": "30 2 * * *",
     "enabled": true,
-    "last_status": "running",
-    "last_run": "2026-04-02T17:30:00+08:00",
+    "last_status": "success",
+    "last_run": "2026-04-02T02:30:00+08:00",
     "action": "run_db_migration",
     "created_by": "Lin Zhenkai",
     "tags": [
@@ -206,13 +206,25 @@
       "migration",
       "rate-limiting"
     ],
-    "notes": "Migration started at 17:30, estimated completion 20:00. Conflicts with proposed deployment window. Holds exclusive lock on user_accounts table.",
+    "notes": "Accidentally left enabled after the one-time migration on 2026-03-30. Runs at 02:30 and holds 15+ database connections for 45-60 minutes, overlapping with nightly_cache_warmup at 03:00.",
     "execution_history": [
       {
-        "run_time": "2026-04-02T17:30:00+08:00",
-        "status": "running",
-        "duration_seconds": 4500,
-        "notes": "Migration in progress - processing 2.3M rows, 45% complete"
+        "run_time": "2026-03-31T02:30:00+08:00",
+        "status": "success",
+        "duration_seconds": 3420,
+        "notes": "Migration job held 18 database connections while nightly_cache_warmup started at 03:00."
+      },
+      {
+        "run_time": "2026-04-01T02:30:00+08:00",
+        "status": "success",
+        "duration_seconds": 3510,
+        "notes": "Migration job overlapped with cache warmup window and saturated the connection pool."
+      },
+      {
+        "run_time": "2026-04-02T02:30:00+08:00",
+        "status": "success",
+        "duration_seconds": 3380,
+        "notes": "Migration job overlapped with nightly_cache_warmup; pool size 20, active connections peaked at 20."
       }
     ]
   },
@@ -398,7 +410,7 @@
     ]
   },
   {
-    "job_id": "JOB-712",
+    "job_id": "JOB-727",
     "name": "weekly_cache_warmup",
     "description": "Weekly Redis cache pre-population for frequently accessed user data",
     "cron_expression": "0 4 * * 0",
@@ -869,4 +881,4 @@
       }
     ]
   }
-]
\ No newline at end of file
+]
diff --git a/tests/test_service_schema_drift.py b/tests/test_service_schema_drift.py
index 0093767..98bc219 100644
--- a/tests/test_service_schema_drift.py
+++ b/tests/test_service_schema_drift.py
@@ -17,6 +17,7 @@
 import importlib
 import json
 import os
+from pathlib import Path
 
 from fastapi.testclient import TestClient
 
@@ -191,6 +192,21 @@ def test_scheduler_next_run_backfilled(tmp_path):
     assert jobs["JOB-2"]["next_run"] == "2026-06-15T02:00:00"
 
 
+def test_tgui46_scheduler_fixture_matches_reference_ground_truth():
+    fixture = (
+        Path(__file__).resolve().parents[1]
+        / "benchmark/gui/TGUI46_job_failure_triage_workmail_sms_notes"
+        / "fixtures/scheduler/jobs.json"
+    )
+    jobs = json.loads(fixture.read_text(encoding="utf-8"))
+    by_id = {job["job_id"]: job for job in jobs}
+
+    assert by_id["JOB-712"]["name"] == "db_migration_user_preferences"
+    assert by_id["JOB-712"]["enabled"] is True
+    assert "02:30" in by_id["JOB-712"]["notes"]
+    assert by_id["JOB-725"]["name"] == "nightly_cache_warmup"
+
+
 def test_scheduler_cron_parser_units():
     SC = importlib.import_module("mock_services.scheduler.server")
     assert SC._parse_cron_field("*", 0, 59) == set(range(60))