diff --git a/.gitattributes b/.gitattributes
index 03098508..a4cdddbf 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -27,6 +27,9 @@ rust_backend/vendor/rustix-1.1.5/ORG_CODE_OF_CONDUCT.md whitespace=-blank-at-eol
 # Preserve libusb's upstream sources, license whitespace, and source hashes.
 rust_backend/vendor/libusb1-sys-0.7.0/** -whitespace
 
+# Frozen Unicode 15.0.0 case table; its generator is no longer in the repository.
+rust_backend/crates/core/src/metadata/musicbrainz/case_data.rs linguist-generated=true
+
 # Binary files
 *.png binary
 *.jpg binary
diff --git a/rust_backend/crates/core/src/metadata/musicbrainz/case_data.rs b/rust_backend/crates/core/src/metadata/musicbrainz/case_data.rs
index e64e31ae..098ec739 100644
--- a/rust_backend/crates/core/src/metadata/musicbrainz/case_data.rs
+++ b/rust_backend/crates/core/src/metadata/musicbrainz/case_data.rs
@@ -1,5 +1,7 @@
-// Generated by docs/internal/legacy-go/rust_backend/tools/generate_case_data.go. DO NOT EDIT.
-// Unicode 15.0.0, golang.org/x/text v0.41.0; see NOTICE.
+// Generated and frozen. DO NOT EDIT.
+// Pinned to Unicode 15.0.0 (golang.org/x/text v0.41.0; see NOTICE) for matching
+// parity with the retired Go backend. It was generated once by a tool that is no
+// longer in the repository, and must not be regenerated with newer std tables.
 // Flags: cased=1, case-ignorable=2, word break=4, mid punctuation=8.
 #[rustfmt::skip]
 pub(super) const RANGES: &[(u32, u32, u8)] = &[