Appchain migration

[jorgemmsilva]

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What does this PR do?

• Summary:
  • <Provide a brief description of what this PR implements, the problem it solves, or the feature it introduces. Include relevant context as needed.>
• Key Changes:
  • < List out major code changes or functionality modifications in bullet points.>
• <Goal of this section: someone reads this in a few months and at-a-glance understands why this change got made + what it is>

Breaking changes?

• Yes/No:
  • <Does this PR introduce any breaking changes (API/config/schema) for node operators?>
  • <If yes, explain the breaking change, its impact, and applicable upgrade steps.>

Metrics changes?

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  • <Does this PR introduce any changes to metrics that might affect our dashboards or alerts?>
  • <If yes, explain the metric(s) what are added/removed/updated>

Anything interesting?

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• < Did you use something fancy or new to you that teammates may not have seen before? Help your reviewer by explaining it here and link any references you used>

Documentation

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• <Do we have a repo doc where this feature is already documented? If not, can you add a relevant README.md or update an existing one?>

How can this PR be tested?

• <Do existing tests cover the change? Do you need to add any (unit, e2e, CI) tests?>
• <If you had to test this locally, share the steps to reproduce the behavior here. Ideally, include your testing in CI>