shashbha14 opened a new pull request, #66102:
URL: https://github.com/apache/airflow/pull/66102

   Closes #66101
   
   `CronMixin` in the task-sdk (`@attrs.define` version introduced in 3.2.1)
   calls `croniter(self.expression)` directly without first resolving cron
   presets like `@quarterly` → `0 0 1 */3 *`. Croniter does not recognise
   `@quarterly` and raises `CroniterBadCronError`, which is re-raised as
   `AirflowTimetableInvalid`.
   
   Added `__attrs_post_init__` to resolve presets before use, and a
   `CRON_PRESETS` dict in the SDK (mirroring `airflow.utils.dates.cron_presets`
   from airflow-core, which the SDK cannot import).
   
   ---
   > I used Claude (claude.ai) as an AI assistant for parts of this 
implementation.


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