fix: align daily matrix ranking universe

tests/unit/test_backtest_service.py

@@ -1127,6 +1127,53 @@ def test_replay_ticker_candidates_carry_gate_fields():
     assert all(c["ranking_period"][0] == "date" for c in daily_cands)
 
 
+def test_slim_replay_can_retain_shorts_for_ranking_universe(monkeypatch):
+    setup = {
+        "entry": 100.0,
+        "stop": 95.0,
+        "target": 110.0,
+        "rr": 2.0,
+        "confidence": 80.0,
+        "primary_prob": 0.6,
+        "best_prob": 0.7,
+        "momentum": 0.1,
+        "meets_core": True,
+        "action": "BUY_MODERATE",
+        "risk_level": "MEDIUM",
+    }
+    monkeypatch.setattr(
+        bt,
+        "_window_setups",
+        lambda *_args, **_kwargs: [
+            {**setup, "direction": "long"},
+            {**setup, "direction": "short", "stop": 105.0, "target": 90.0},
+        ],
+    )
+    count = bt.MIN_LOOKBACK + bt.HORIZON
+    first_ord = date(2025, 1, 1).toordinal()
+    columns = (
+        list(range(first_ord, first_ord + count)),
+        [100.0] * count,
+        [101.0] * count,
+        [99.0] * count,
+        [100.0] * count,
+        [1_000_000] * count,
+    )
+
+    long_only = bt._replay_candidates_for_period(
+        "AAA", columns, {}, {}, None, date.min, "daily"
+    )
+    full_ranking_universe = bt._replay_candidates_for_period(
+        "AAA", columns, {}, {}, None, date.min, "daily", True
+    )
+
+    assert [row["direction"] for row in long_only] == ["long"]
+    assert {row["direction"] for row in full_ranking_universe} == {
+        "long",
+        "short",
+    }
+
+
 def test_daily_replay_uses_exact_date_ranking_periods():
     candidates = [
         {