fix(denoise): keep close columns as a list

src/mtdata/shared/schema.py

@@ -547,7 +547,7 @@ DenoiseMethodLiteral = Literal[_DENOISE_METHODS]  # type: ignore
 class DenoiseSpec(TypedDict, total=False):
     method: DenoiseMethodLiteral  # type: ignore
     params: Dict[str, Any]
-    columns: List[str]
+    columns: Union[str, List[str]]
     when: Literal['pre_ti', 'post_ti']  # type: ignore
     causality: Literal['causal', 'zero_phase']  # type: ignore
     keep_original: bool

src/mtdata/utils/denoise/api.py

@@ -127,7 +127,7 @@ def normalize_denoise_pipeline_values(
 
 
 _COLUMN_ALIASES_OHLC = frozenset({"ohlc"})
-_COLUMN_ALIASES_CLOSE = frozenset({"price", "close"})
+_COLUMN_ALIASES_CLOSE = frozenset({"price"})
 _COLUMN_ALIASES_OHLCV = frozenset({"ohlcv"})
 _COLUMN_ALIASES_ALL = frozenset({"all", "*", "numeric"})
 _COLUMN_ALIASES = (

tests/utils/test_denoise_pure.py

@@ -246,6 +246,10 @@ class TestNormalizeDenoiseSec:
         out = normalize_denoise_spec({"method": "sma", "columns": "price"})
         assert out["columns"] == "price"
 
+    def test_keeps_concrete_close_column_as_list(self):
+        out = normalize_denoise_spec({"method": "sma", "columns": ["close"]})
+        assert out["columns"] == ["close"]
+
     def test_preserves_list_wrapped_alias(self):
         out = normalize_denoise_spec({"method": "sma", "columns": ["ohlc"]})
         assert out["columns"] == "ohlc"