FIX: Re-add 'timeseries' index without duplication

src/fmu/dataio/_definitions.py

@@ -72,6 +72,7 @@ class ExportFolder(str, Enum):
 STANDARD_TABLE_INDEX_COLUMNS: Final[dict[str, list[str]]] = {
     "volumes": ["ZONE", "REGION", "FACIES", "LICENCE"],
     "rft": ["measured_depth", "well", "time"],
+    "timeseries": ["DATE"],
     "simulationtimeseries": ["DATE"],
     "wellpicks": ["WELL", "HORIZON"],
 }

src/fmu/dataio/providers/objectdata/_tables.py

@@ -44,7 +44,7 @@ def _derive_index(table_index: list[str] | None, columns: list[str]) -> list[str
         logger.debug("Finding index to include")
         for context, standard_cols in STANDARD_TABLE_INDEX_COLUMNS.items():
             for valid_col in standard_cols:
-                if valid_col in columns:
+                if valid_col in columns and valid_col not in index:
                     index.append(valid_col)
             if index:
                 logger.info("Context is %s ", context)

tests/conftest.py

@@ -650,6 +650,18 @@ def fixture_edataobj3(globalconfig1):
     )
 
 
+@pytest.fixture
+def export_data_obj_timeseries(globalconfig1):
+    """Combined globalconfig and settings to instance, for internal testing"""
+
+    return ExportData(
+        config=globalconfig1,
+        name="some timeseries",
+        content="timeseries",
+        tagname="",
+    )
+
+
 @pytest.fixture(name="mock_summary")
 def fixture_summary():
     """Return summary mock data

tests/test_units/test_table.py

@@ -153,6 +153,17 @@ def test_set_table_index_not_in_table(
     assert k_err.value.args[0] == "banana is not in table"
 
 
+def test_table_index_timeseries(export_data_obj_timeseries, drogon_summary):
+    """Test setting of table_index in an arbitrary timeseries.
+
+    Args:
+        edataobj3 (dict): metadata
+        drogon_summary (pd.Dataframe): dataframe with summary data from sumo
+    """
+    objdata = objectdata_provider_factory(drogon_summary, export_data_obj_timeseries)
+    assert objdata.table_index == ["DATE"], "Incorrect table index "
+
+
 def test_table_index_real_summary(edataobj3, drogon_summary):
     """Test setting of table_index in real summary file