feat(database): add index block_hash for table block_signature (#340)

Author: yiweichi

crates/database/migration/src/lib.rs

@@ -10,6 +10,7 @@ mod m20250825_093350_remove_unsafe_l2_blocks;
 mod m20250829_042803_add_table_indexes;
 mod m20250901_102341_add_commit_batch_processed_column;
 mod m20250904_175949_block_signature;
+mod m20250923_135359_add_index_block_hash;
 mod migration_info;
 pub use migration_info::{
     MigrationInfo, ScrollDevMigrationInfo, ScrollMainnetMigrationInfo, ScrollSepoliaMigrationInfo,
@@ -31,6 +32,7 @@ impl<MI: MigrationInfo + Send + Sync + 'static> MigratorTrait for Migrator<MI> {
             Box::new(m20250829_042803_add_table_indexes::Migration),
             Box::new(m20250901_102341_add_commit_batch_processed_column::Migration),
             Box::new(m20250904_175949_block_signature::Migration),
+            Box::new(m20250923_135359_add_index_block_hash::Migration),
         ]
     }
 }

crates/database/migration/src/m20250923_135359_add_index_block_hash.rs

@@ -0,0 +1,37 @@
+use super::m20250904_175949_block_signature::BlockSignature;
+use sea_orm_migration::prelude::*;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        // Create indexes for the `block_signature` table.
+        manager
+            .create_index(
+                Index::create()
+                    .name("idx_block_signature_block_hash")
+                    .col(BlockSignature::BlockHash)
+                    .table(BlockSignature::Table)
+                    .to_owned(),
+            )
+            .await?;
+
+        Ok(())
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        // Drop indexes for the `block_signature` table.
+        manager
+            .drop_index(
+                Index::drop()
+                    .name("idx_block_signature_block_hash")
+                    .table(BlockSignature::Table)
+                    .to_owned(),
+            )
+            .await?;
+
+        Ok(())
+    }
+}