Move BaseSensorOperator to TaskSDK definitions

airflow-core/src/airflow/api_fastapi/execution_api/routes/task_reschedules.py

@@ -20,7 +20,7 @@
 from typing import Annotated
 from uuid import UUID
 
-from fastapi import HTTPException, Query, status
+from fastapi import Query, status
 from sqlalchemy import select
 
 from airflow.api_fastapi.common.db.common import SessionDep
@@ -39,7 +39,8 @@
 @router.get("/{task_instance_id}/start_date")
 def get_start_date(
     task_instance_id: UUID, session: SessionDep, try_number: Annotated[int, Query()] = 1
-) -> UtcDateTime:
+) -> UtcDateTime | None:
+    """Get the first reschedule date if found, None if no records exist."""
     start_date = session.scalar(
         select(TaskReschedule)
         .where(
@@ -50,7 +51,5 @@ def get_start_date(
         .with_only_columns(TaskReschedule.start_date)
         .limit(1)
     )
-    if start_date is None:
-        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)
 
     return start_date

airflow-core/src/airflow/models/baseoperator.py

@@ -386,16 +386,6 @@ def pre_execute(self, context: Any):
             logger=self.log,
         ).run(context)
 
-    def execute(self, context: Context) -> Any:
-        """
-        Derive when creating an operator.
-
-        Context is the same dictionary used as when rendering jinja templates.
-
-        Refer to get_template_context for more context.
-        """
-        raise NotImplementedError()
-
     @apply_lineage
     def post_execute(self, context: Any, result: Any = None):
         """

airflow-core/src/airflow/models/taskinstance.py

@@ -2324,6 +2324,16 @@ def get_failed_dep_statuses(self, dep_context: DepContext | None = None, session
         if TYPE_CHECKING:
             assert isinstance(self.task, BaseOperator)
 
+        if not hasattr(self.task, "deps"):
+            # These deps are not on BaseOperator since they are only needed and evaluated
+            # in the scheduler and not needed at the Runtime.
+            from airflow.serialization.serialized_objects import SerializedBaseOperator
+
+            serialized_op = SerializedBaseOperator.deserialize_operator(
+                SerializedBaseOperator.serialize_operator(self.task)
+            )
+            setattr(self.task, "deps", serialized_op.deps)  # type: ignore[union-attr]
+
         dep_context = dep_context or DepContext()
         for dep in dep_context.deps | self.task.deps:
             for dep_status in dep.get_dep_statuses(self, session, dep_context):

airflow-core/src/airflow/sensors/__init__.py

@@ -26,6 +26,7 @@
 
 from airflow.utils.deprecation_tools import add_deprecated_classes
 
+# TODO: Add definition from Task SDK here and remove `base.py` file
 __deprecated_classes = {
     "python":{
         "PythonSensor": "airflow.providers.standard.sensors.python.PythonSensor",