diff --git a/src/cli.py b/src/cli.py
index 78a8357..cc845f4 100644
--- a/src/cli.py
+++ b/src/cli.py
@@ -5310,6 +5310,46 @@ def _load_security_alerts_by_name(*, output_dir: Path, username: str) -> dict[st
     return {name: entry for name, entry in data.items() if isinstance(entry, dict)}
 
 
+WAREHOUSE_REPORT_STALE_DAYS = 7
+
+
+def _warn_if_warehouse_report_stale(output_dir: Path, username: str) -> None:
+    """Warn when the legacy warehouse report is missing or stale (F2).
+
+    Notion OS's external-signal-sync reads ``audit-report-<username>-*.json`` (the
+    3.7 warehouse report), but ``--portfolio-truth`` mode does NOT regenerate it —
+    the truth pipeline scans the workspace and never runs the GitHub audit that
+    produces warehouse data. Per the F2 "keep both artifacts live" decision, surface
+    the gap at generation time so the operator runs ``audit report <username>`` to
+    keep Notion's Repo Auditor signal fresh. Complements the cross-system-smoke C2
+    check, which catches the same drift at smoke time.
+    """
+    from datetime import date
+
+    reports = sorted(output_dir.glob(f"audit-report-{username}-*.json"))
+    if not reports:
+        print_warning(
+            f"No audit-report-{username}-*.json in {output_dir}: Notion's Repo Auditor "
+            f"signal reads that warehouse report and this --portfolio-truth run did not "
+            f"create one. Run `audit report {username}` to generate it (F2)."
+        )
+        return
+    match = re.search(r"(\d{4}-\d{2}-\d{2})", reports[-1].name)
+    if not match:
+        return
+    try:
+        report_date = date.fromisoformat(match.group(1))
+    except ValueError:
+        return
+    age = (date.today() - report_date).days
+    if age > WAREHOUSE_REPORT_STALE_DAYS:
+        print_warning(
+            f"Newest warehouse report {reports[-1].name} is {age}d old: Notion's Repo "
+            f"Auditor signal reads it and is now stale. Run `audit report {username}` to "
+            f"refresh the warehouse report (F2 — both artifacts kept live by decision)."
+        )
+
+
 def _run_portfolio_truth_mode(args) -> None:
     from src.portfolio_truth_publish import publish_portfolio_truth
 
@@ -5361,6 +5401,7 @@ def _run_portfolio_truth_mode(args) -> None:
         f"(registry {'updated' if result.registry_changed else 'unchanged'}, "
         f"report {'updated' if result.report_changed else 'unchanged'})"
     )
+    _warn_if_warehouse_report_stale(output_dir, args.username)
 
 
 def _run_portfolio_context_recovery_mode(args) -> None:
diff --git a/tests/test_portfolio_truth.py b/tests/test_portfolio_truth.py
index a0ee94c..407dabc 100644
--- a/tests/test_portfolio_truth.py
+++ b/tests/test_portfolio_truth.py
@@ -1387,3 +1387,42 @@ def test_git_default_branch_empty_when_origin_head_unset(tmp_path: Path) -> None
 
     # A freshly init'd repo has no origin/HEAD → "" so callers fall back.
     assert _git_default_branch(repo) == ""
+
+
+# ── F2: warehouse-report staleness reminder ────────────────────────────────
+from src.cli import _warn_if_warehouse_report_stale  # noqa: E402
+
+
+def _write_warehouse_report(d: Path, username: str, date_str: str) -> None:
+    (d / f"audit-report-{username}-{date_str}.json").write_text("{}", encoding="utf-8")
+
+
+class TestWarehouseStalenessReminder:
+    """F2 (keep-dual): --portfolio-truth mode warns when the warehouse report Notion
+    reads is missing or stale, so the operator refreshes it."""
+
+    def test_missing_report_warns(self, tmp_path: Path, capsys) -> None:
+        import re
+
+        _warn_if_warehouse_report_stale(tmp_path, "saagpatel")
+        captured = capsys.readouterr()
+        # print_warning word-wraps, so normalize whitespace before substring checks
+        combined = re.sub(r"\s+", " ", captured.out + captured.err)
+        assert "No audit-report-saagpatel" in combined
+        assert "audit report saagpatel" in combined
+
+    def test_stale_report_warns(self, tmp_path: Path, capsys) -> None:
+        _write_warehouse_report(tmp_path, "saagpatel", "2020-01-01")
+        _warn_if_warehouse_report_stale(tmp_path, "saagpatel")
+        captured = capsys.readouterr()
+        assert "stale" in (captured.out + captured.err).lower()
+
+    def test_fresh_report_no_warning(self, tmp_path: Path, capsys) -> None:
+        from datetime import date
+
+        _write_warehouse_report(tmp_path, "saagpatel", date.today().isoformat())
+        _warn_if_warehouse_report_stale(tmp_path, "saagpatel")
+        captured = capsys.readouterr()
+        combined = captured.out + captured.err
+        assert "stale" not in combined.lower()
+        assert "No audit-report" not in combined