class_docstr: Adds semantics information to the user configured model.
code: def time_spine_source(self) -> TimeSpineSource:  # noqa: D
      time_spine_table_configurations = (
          self._semantic_manifest.project_configuration.time_spine_table_configurations
      )
  
      if not (
          len(time_spine_table_configurations) == 1
          and time_spine_table_configurations[0].grain
          == TimeGranularity.DAY
      ):
          raise NotImplementedError(
              f"Only a single time spine table configuration with {TimeGranularity.DAY} is currently "
              f"supported. Got:\n"
              f"{pformat_big_objects(time_spine_table_configurations)}"
          )
  
      time_spine_table_configuration = time_spine_table_configurations[
          0
      ]
      time_spine_table = SqlTable.from_string(
          time_spine_table_configuration.location
      )
      return TimeSpineSource(
          schema_name=time_spine_table.schema_name,
          table_name=time_spine_table.table_name,
          time_column_name=time_spine_table_configuration.column_name,
          time_column_granularity=time_spine_table_configuration.grain,
      )
  
file_path: metricflow/metricflow/model/semantic_manifest_lookup.py
imports: from __future__ import annotations
  import logging
  from dbt_semantic_interfaces.pretty_print import pformat_big_objects
  from dbt_semantic_interfaces.protocols.semantic_manifest import SemanticManifest
  from dbt_semantic_interfaces.type_enums import TimeGranularity
  from metricflow.dataflow.sql_table import SqlTable
  from metricflow.model.semantics.metric_lookup import MetricLookup
  from metricflow.model.semantics.semantic_model_lookup import SemanticModelLookup
  from metricflow.plan_conversion.time_spine import TimeSpineSource
  from metricflow.protocols.semantics import SemanticModelAccessor
label_desc: Use image node_id 5 for calling the SemanticManifestLookup obj's underlying member method code with example usage: obj.time_spine_source() and returns: TimeSpineSource