feat: add blockhash index to metadata_table Clarity VM table

Author: hstove

CHANGELOG.md

@@ -10,14 +10,15 @@ and this project adheres to the versioning scheme outlined in the [README.md](RE
 ### Changed
 - Add index for StacksBlockId to nakamoto block headers table (improves node performance)
 - Remove the panic for reporting DB deadlocks (just error and continue waiting)
+- Add index to `metadata_table` in Clarity DB on `blockhash`
 
 ## [3.0.0.0.1]
 
 ### Changed
 - Add index for StacksBlockId to nakamoto block headers table (improves node performance)
 - Remove the panic for reporting DB deadlocks (just error and continue waiting)
 - Various test fixes for CI (5353, 5368, 5372, 5371, 5380, 5378, 5387, 5396, 5390, 5394)
-- Various log fixes: 
+- Various log fixes:
     - don't say proceeding to mine blocks if not a miner
     - misc. warns downgraded to debugs
 - 5391: Update default block proposal timeout to 10 minutes

clarity/src/vm/database/sqlite.rs

@@ -248,6 +248,12 @@ impl SqliteConnection {
         )
         .map_err(|x| InterpreterError::SqliteError(IncomparableError { err: x }))?;
 
+        conn.execute(
+            "CREATE INDEX IF NOT EXISTS md_blockhashes ON metadata_table(blockhash)",
+            NO_PARAMS,
+        )
+        .map_err(|x| InterpreterError::SqliteError(IncomparableError { err: x }))?;
+
         Self::check_schema(conn)?;
 
         Ok(())