Set KSM/DOT Asset Rate Locations on Kusama Asset Hub (Post-Migration Restoration)

This proposal restores the KSM/DOT asset rate mappings on Kusama Asset Hub, which were not mapped during the migration and therefore need to be redefined. Since the asset IDs (XCM locations) were not re-anchored, they cannot be used correctly in their current form. These rates are required for track validation of future treasury calls that reference KSM/DOT conversions.

The batch call performs the following:

Removes obsolete KSM rate entries from earlier configurations.
Sets new asset rate mappings between Kusama and Polkadot Asset Hubs.
Defines a KSM/DOT rate of 4x, consistent with the pre-migration configuration.

Each rate is represented as a Fixed-Point 128-bit unsigned integer, using a divisor of 10¹⁸.
Internally, the type is a wrapper around u128 and decodes accordingly.

The provided tests can be used to reason about and verify the rate values:

https://github.com/paritytech/polkadot-sdk/compare/muharem-rates-test#diff-6a80cbb1bb6f62b0c40f61614fd0a74f924f721431e7f2c818a2543a739041daR83

Edited

This update fixes the KSM and DOT exchange rates on Kusama Asset Hub.
The rates were lost during a system move and need to be set again.
It removes old, unused KSM rate information.
It adds new exchange rates between Kusama and Polkadot Asset Hubs.
The KSM to DOT rate is set at 4 to 1, just like before.
Rates are stored using special large numbers for accuracy.
This helps the treasury system work correctly with KSM and DOT conversions.

Source

This proposal restores the KSM/DOT asset rate mappings on Kusama Asset Hub, which were not mapped during the migration and therefore need to be redefined. Since the asset IDs (XCM locations) were not re-anchored, they cannot be used correctly in their current form. These rates are required for track validation of future treasury calls that reference KSM/DOT conversions.

The batch call performs the following:

Removes obsolete KSM rate entries from earlier configurations.
Sets new asset rate mappings between Kusama and Polkadot Asset Hubs.
Defines a KSM/DOT rate of 4x, consistent with the pre-migration configuration.

Each rate is represented as a Fixed-Point 128-bit unsigned integer, using a divisor of 10¹⁸.
Internally, the type is a wrapper around u128 and decodes accordingly.

The provided tests can be used to reason about and verify the rate values:

https://github.com/paritytech/polkadot-sdk/compare/muharem-rates-test#diff-6a80cbb1bb6f62b0c40f61614fd0a74f924f721431e7f2c818a2543a739041daR83

Edited