fix: preserve multi-cause reconcile warnings and align slot blocking

Co-authored-by: genichin <4282227+genichin@users.noreply.github.com>

tests/adapters/portfolio/test_reconcile_warning_store.py

@@ -0,0 +1,42 @@
+"""PostgreSQLReconcileWarningStore integration tests."""
+from __future__ import annotations
+
+from trex_core.adapters.portfolio.reconcile_warning_store import (
+    PostgreSQLReconcileWarningStore,
+)
+
+
+def test_warning_store_preserves_multiple_cases_for_same_slot(pg_clean):
+    store = PostgreSQLReconcileWarningStore(pg_clean)
+    store.set_warned("slot-1", portfolio_id="pf-A", case_code="B", reason="b")
+    store.set_warned("slot-1", portfolio_id="pf-A", case_code="C", reason="c")
+
+    assert store.is_warned("slot-1") is True
+    info = store.get_warning_info("slot-1")
+    assert info is not None
+    assert info["case_codes"] == ["B", "C"]
+
+
+def test_warning_store_case_specific_clear_and_full_clear(pg_clean):
+    store = PostgreSQLReconcileWarningStore(pg_clean)
+    store.set_warned("slot-2", portfolio_id="pf-A", case_code="B")
+    store.set_warned("slot-2", portfolio_id="pf-A", case_code="C")
+
+    store.clear_warned("slot-2", case_code="C")
+    info = store.get_warning_info("slot-2")
+    assert info is not None
+    assert info["case_codes"] == ["B"]
+
+    store.clear_warned("slot-2")
+    assert store.is_warned("slot-2") is False
+
+
+def test_warning_store_is_durable_across_reinstantiation(pg_clean):
+    a = PostgreSQLReconcileWarningStore(pg_clean)
+    a.set_warned("slot-restart", portfolio_id="pf-A", case_code="B")
+    a.set_warned("slot-restart", portfolio_id="pf-A", case_code="C")
+
+    b = PostgreSQLReconcileWarningStore(pg_clean)
+    info = b.get_warning_info("slot-restart")
+    assert info is not None
+    assert info["case_codes"] == ["B", "C"]