Fixing StakingHotkeys index

[grbIzl]

Description

Migration was introduced that adds missing coldkey<->hotkey pairs into StakingHotkeys index.

Related Issue(s)

• Closes Missing StakingHotkeys #2201

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe):

Breaking Change

If this PR introduces a breaking change, please provide a detailed description of the impact and the migration path for existing applications.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have run ./scripts/fix_rust.sh to ensure my code is formatted and linted correctly
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Screenshots (if applicable)

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Additional Notes

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[open-junius]

There is a read for Alpha, need update weight. Alpha is a big map, it is better to find other storage to find out missed (cold, hot) relation.

[grbIzl]

Thanks @open-junius ! I added the forgotten weight. As for the Alfa map idea: I understand your concern but StakingHotkeys is literally index for Alfa map (please correct me if I'm wrong) and one of its goals is indeed to replace some costly calls to Alfa map. In this case using different map for (cold, hot) relation (like Owner map) doesn't make sense to me. Wdyt?