diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index c7b7b318..90c742a1 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -4,3 +4,6 @@
 #
 # Prettier one-time repo-wide format pass (R2 S1b, 2026-07-21)
 51c36c2071728d2cd7ae580b7bfdf21f6867a347
+
+# ruff format one-time backend + scripts pass (line-length 100, 2026-08-23)
+b1832afd180866b922521148603db447020c57a4