Summary

Add an EVM database wrapper that routes block-related data into heightindexdb while keeping non-block data on the existing KV store. This is intended to reduce KV usage/compaction pressure.

Scope

• Block routing:
  • Wrap the existing EVM ethdb.Database.
  • Route block headers, bodies, and receipts to height-indexed databases.
  • Keep all non-block data on the underlying KV store.
• Integration with x/blockdb:
  • Store headers/bodies/receipts in dedicated height-indexed stores managed by x/blockdb.
• Migration:
  • Provide a mechanism to migrate existing canonical block data from the KV store into the new height-indexed databases.
  • Migration should be safe to run in the background and resilient across restarts.