**Major Changes**

* Upgrade Polkadot SDK to 2503-7
* Add model validation support for optional fields in Parquet schemas
* Add support for Snowbridge (not enabled on mainnet)

Includes all updates from:

* [https://github.com/frequency-chain/frequency/releases/tag/v1.17.3](https://github.com/frequency-chain/frequency/releases/tag/v1.17.3)
* [https://github.com/frequency-chain/frequency/releases/tag/v1.17.4](https://github.com/frequency-chain/frequency/releases/tag/v1.17.4)

#23 Upgrade Frequency Runtime to v1.17.4 (Runtime Version v176)

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