Copilot commented on code in PR #69864:
URL: https://github.com/apache/airflow/pull/69864#discussion_r3580125586


##########
airflow-core/src/airflow/models/dag_version.py:
##########
@@ -40,6 +41,13 @@
 
 log = logging.getLogger(__name__)
 
+SourceStatus = Literal["current_stored_code", "redacted", "unavailable"]
+ValuesStatus = Literal["available", "unavailable"]
+
+
+class DagVersionNotFoundError(ValueError):
+    """Raised when one of the requested Dag versions does not exist."""
+

Review Comment:
   `DagVersionNotFoundError` is very close in meaning/name to the existing 
`airflow.exceptions.DagVersionNotFound` (used in other parts of the codebase). 
Having two similarly named exceptions for “DagVersion missing” increases 
ambiguity for callers and error handling (which one should API/CLI layer 
catch/translate?). Consider reusing `DagVersionNotFound` or renaming this 
exception to be more specific to this method (and updating tests accordingly).



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