#### PR Dependency Tree
* **PR #14788** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
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## Summary by CodeRabbit
* **Bug Fixes**
* Calendar subscriptions now gracefully fall back to polling when push
notifications aren’t supported, keeping syncs working.
* Affected subscriptions have webhook details cleared and are marked
with a long-lived expiration to avoid repeated webhook attempts.
* Prevents repeated retries for unsupported push channels, reducing
unnecessary errors and retries.
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