git sync

.changes/unreleased/Under the Hood-20241031-093251.yaml

@@ -0,0 +1,6 @@
+kind: Under the Hood
+body: Behavior change for mf timespine without yaml configuration
+time: 2024-10-31T09:32:51.166594-05:00
+custom:
+    Author: DevonFulcher
+    Issue: "10959"

core/dbt/contracts/graph/semantic_manifest.py

@@ -91,6 +91,22 @@ def validate(self) -> bool:
 
         validator = SemanticManifestValidator[PydanticSemanticManifest]()
         validation_results = validator.validate_semantic_manifest(semantic_manifest)
+        time_spines = semantic_manifest.project_configuration.time_spines
+        legacy_time_spines = (
+            semantic_manifest.project_configuration.time_spine_table_configurations
+        )
+        # If the time spine contains a day grain then it is functionally equivalent to the legacy time spine.
+        time_spines_contain_day = any(
+            c for c in time_spines if c.primary_column.time_granularity == TimeGranularity.DAY
+        )
+        if (
+            get_flags().require_yaml_configuration_for_mf_time_spines is False
+            and legacy_time_spines
+            and not time_spines_contain_day
+        ):
+            deprecations.warn(
+                "mf-timespine-without-yaml-configuration",
+            )
 
         for warning in validation_results.warnings:
             fire_event(SemanticValidationFailure(msg=warning.message))