Index for block refetch_needed

CHANGELOG.md

@@ -57,6 +57,7 @@
 
 - [#9094](https://github.com/blockscout/blockscout/pull/9094) - Improve exchange rates logging
 - [#9014](https://github.com/blockscout/blockscout/pull/9014) - Decrease amount of NFT in address collection: 15 -> 9
+- [#9009](https://github.com/blockscout/blockscout/pull/9009) - Index for block refetch_needed
 - [#8994](https://github.com/blockscout/blockscout/pull/8994) - Refactor transactions event preloads
 
 <details>

apps/explorer/priv/repo/migrations/20231215132609_add_index_blocks_refetch_needed.exs

@@ -0,0 +1,15 @@
+defmodule Explorer.Repo.Migrations.AddIndexBlocksRefetchNeeded do
+  use Ecto.Migration
+
+  def up do
+    execute("""
+    CREATE INDEX consensus_block_hashes_refetch_needed ON blocks((1)) WHERE consensus and refetch_needed;
+    """)
+  end
+
+  def down do
+    execute("""
+    DROP INDEX consensus_block_hashes_refetch_needed;
+    """)
+  end
+end