From fa05d19f1b225259500b49f46468f314a1070855 Mon Sep 17 00:00:00 2001
From: DaniPopes <57450786+DaniPopes@users.noreply.github.com>
Date: Mon, 5 Jan 2026 18:58:20 +0100
Subject: [PATCH] fix(bench-compare): add backward compat for old CSV format
 (#20754)

---
 bin/reth-bench-compare/src/comparison.rs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/bin/reth-bench-compare/src/comparison.rs b/bin/reth-bench-compare/src/comparison.rs
index 087ccaf3ce..0c9ffefb7c 100644
--- a/bin/reth-bench-compare/src/comparison.rs
+++ b/bin/reth-bench-compare/src/comparison.rs
@@ -39,7 +39,8 @@ pub(crate) struct BenchmarkResults {
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub(crate) struct CombinedLatencyRow {
     pub block_number: u64,
-    pub transaction_count: u64,
+    #[serde(default)]
+    pub transaction_count: Option<u64>,
     pub gas_used: u64,
     pub new_payload_latency: u128,
 }
@@ -48,7 +49,8 @@ pub(crate) struct CombinedLatencyRow {
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub(crate) struct TotalGasRow {
     pub block_number: u64,
-    pub transaction_count: u64,
+    #[serde(default)]
+    pub transaction_count: Option<u64>,
     pub gas_used: u64,
     pub time: u128,
 }
@@ -125,7 +127,8 @@ pub(crate) struct ComparisonSummary {
 #[derive(Debug, Serialize)]
 pub(crate) struct BlockComparison {
     pub block_number: u64,
-    pub transaction_count: u64,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub transaction_count: Option<u64>,
     pub gas_used: u64,
     pub baseline_new_payload_latency: u128,
     pub feature_new_payload_latency: u128,