chore(db): clean up grant.metadata column

[GAlexIHU]

Overview

(don't merge immediately, wait a few days, weeks...)

Cleanup PR

Notes for reviewer

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor/entitlement-v2-touchup-cleanup

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[chrisgacsal]

Just to avoid merging this too early.

[GAlexIHU]

see this #3434