duplicate indexes in hafbe/haf

Duplicate Indexes These indexes exist, but aren’t needed. Remove them for faster writes.

Details On blocks hive_blocks_created_at_idx (created_at) is covered by uq_hive_blocks_created_at (created_at) On current_witness_votes current_witness_votes_voter_id (voter_id) is covered by pk_current_witness_votes (voter_id, witness_id)