Add oracle prices index on ("marketId", "effectiveAtHeight") (backport #2368)

[mergify]

Changelist

Add oracle prices index on ("marketId", "effectiveAtHeight")

Test Plan

Tested internally

Author/Reviewer Checklist

• If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
• If the PR has breaking postgres changes to the indexer add the indexer-postgres-breaking label.
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Summary by CodeRabbit

• New Features
  • Introduced an index on the oracle_prices table to enhance query performance.
• Bug Fixes
  • Improved database migration process to allow for non-blocking index creation and deletion.

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This is an automatic backport of pull request #2368 done by [Mergify](https://mergify.com).

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