perf(slots): BAT-040 — slots RPC DB-level status 필터 (REQ-002/006/073, issue #25)

REQ-002/006 change-req(CHG-20260612-01)→구현→confirm-req-implemented,
REQ-073 change-req(CHG-20260612-02, 관찰 계약 불변 Implemented 유지) 전체 delivery.

- repository.py/in_memory_repository.py: SlotRepository.list_slots(instance_key,
  status_filter=None) — status 값 집합 필터, None=전체(기존 호출자 불변).
- postgresql.py: list_slots DB-level WHERE status = ANY(%s) (full scan + Python
  필터 제거). 스키마/마이그레이션 변경 없음.
- messaging_handlers.py: _FILTER_STATUS 매핑으로 filter→status 집합 위임,
  watchdog 갱신용 holding 조회를 all/holding fetch 결과에서 재사용(2nd 커넥션 생략).
- 관찰 가능한 RPC 계약(REQ-073 AC-1~6) 불변 — 동작 보존 최적화.
- tests: in-memory status_filter 5종 + PG 게이트 1종. 439 passed (+5), ruff clean.

REQ-002·006 Approved→Implemented, REQ-073 Implemented 유지, BAT-040 release-candidate.
issue #25 close.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/adapters/persistence/test_postgresql_repository.py

@@ -71,6 +71,19 @@ def test_buy_intent_idempotent_on_pg(pg_clean):
     assert len(pending) == 1  # no double transition
 
 
+def test_list_slots_status_filter_pg(pg_clean):
+    # REQ-006 CHG-20260612-01 (issue #25): DB-level status filter (status = ANY).
+    repo, svc, intents = _wire(pg_clean)
+    repo.reconcile_universe(INST, _SYMS)  # 3 inactive
+    intents.submit_buy(BuyIntent(intent_id="pg-f1", qty=10, portfolio_id="PF-1"))  # PF-1 -> pending_buy
+
+    assert len(repo.list_slots(INST)) == 3                                  # None -> all
+    assert len(repo.list_slots(INST, status_filter={"inactive"})) == 2
+    pending = repo.list_slots(INST, status_filter={"pending_buy", "pending_sell"})
+    assert len(pending) == 1 and pending[0].status is SlotState.PENDING_BUY
+    assert repo.list_slots(INST, status_filter={"error"}) == []
+
+
 def test_buy_by_slot_id_contract_pg(pg_clean):
     # dcy-020/REQ-061: slot_id is the canonical buy key against real PG.
     repo, svc, intents = _wire(pg_clean)

tests/domain/slot/test_list_slots_filter.py

@@ -0,0 +1,70 @@
+"""list_slots status_filter (REQ-002/006 CHG-20260612-01, issue #25).
+
+Pushes status filtering to the repository boundary so the slots RPC handler no
+longer fetches every row and filters in Python. None preserves prior behaviour
+(all slots), so existing unfiltered callers are unaffected.
+"""
+from __future__ import annotations
+
+import pytest
+
+from trex_core.domain.slot import SlotService, SlotState
+from trex_core.domain.slot.in_memory_repository import InMemorySlotRepository
+
+INST = "inst-1"
+
+
+@pytest.fixture
+def repo():
+    return InMemorySlotRepository()
+
+
+def _seed(repo):
+    """3 inactive + 1 holding + 1 pending_buy for INST."""
+    svc = SlotService(repo, instance_key=INST)
+    repo.reconcile_universe(INST, {f"pf-{i}": "SYM" for i in range(5)})
+    # pf-0 -> holding
+    s0 = repo.find_slot_by_portfolio(INST, "pf-0")
+    svc.transit_slot(s0.slot_id, s0.status, SlotState.PENDING_BUY,
+                     reason="r", actor="a", symbol="005930")
+    svc.transit_slot(s0.slot_id, SlotState.PENDING_BUY, SlotState.HOLDING,
+                     reason="r", actor="a", avg_price=70_000)
+    # pf-1 -> pending_buy
+    s1 = repo.find_slot_by_portfolio(INST, "pf-1")
+    svc.transit_slot(s1.slot_id, s1.status, SlotState.PENDING_BUY,
+                     reason="r", actor="a", symbol="005930")
+    # pf-2,3,4 remain inactive
+    return svc
+
+
+def test_none_returns_all(repo):
+    _seed(repo)
+    assert len(repo.list_slots(INST)) == 5
+    assert len(repo.list_slots(INST, status_filter=None)) == 5
+
+
+def test_single_status_filter(repo):
+    _seed(repo)
+    holding = repo.list_slots(INST, status_filter={"holding"})
+    assert len(holding) == 1 and holding[0].status is SlotState.HOLDING
+
+    inactive = repo.list_slots(INST, status_filter={"inactive"})
+    assert len(inactive) == 3
+    assert all(s.status is SlotState.INACTIVE for s in inactive)
+
+
+def test_pending_group_filter(repo):
+    _seed(repo)
+    pending = repo.list_slots(INST, status_filter={"pending_buy", "pending_sell"})
+    assert len(pending) == 1 and pending[0].status is SlotState.PENDING_BUY
+
+
+def test_empty_when_no_match(repo):
+    _seed(repo)
+    assert repo.list_slots(INST, status_filter={"error"}) == []
+
+
+def test_instance_scoped(repo):
+    _seed(repo)
+    # other instance has no slots
+    assert repo.list_slots("other", status_filter={"holding"}) == []