diff --git a/.gitattributes b/.gitattributes
index 380afd4ec..7ecc44547 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -21,3 +21,9 @@ install.ps1 text eol=lf
 # preserved, so they follow the LF rule above.
 bios/** -text
 data/** -text
+
+# Measurement records are append-only: two branches that each add a line to
+# the same file merge by keeping both. A data file is bytes its line vouches
+# for by sha256.
+measurements/*.jsonl text eol=lf merge=union
+measurements/data/** -text
diff --git a/measurements/beetle_saturn.jsonl b/measurements/beetle_saturn.jsonl
new file mode 100644
index 000000000..e5609df5f
--- /dev/null
+++ b/measurements/beetle_saturn.jsonl
@@ -0,0 +1,6 @@
+{"check":{"claim":"The mpeg_card.bin image Beetle Saturn loads changes what the Saturn BIOS shows and does for a Video CD.","method":"Saturn BIOS v1.01 (Japan), region forced to Japan, Video CD Card option enabled, automatic RTC left on and the host clock frozen at 2000-01-01 00:00:00 by libfaketime 0.9.10 so runs are deterministic, the authored Video CD inserted. 3000 frames; Saturn A (libretro B) held 15 frames from frame 1300, which is Play on the BIOS CD player, and Start 15 frames from frame 1900. Repeated with each mpeg_card.bin image, with no file, with 512 KiB of zeros and with a 1-byte file; every other input is identical. 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+{"check":{"claim":"The mpeg_card.bin image Beetle Saturn loads changes what the Saturn BIOS shows and does for a Video CD.","method":"Saturn BIOS v1.00a (mpr-17933), region forced to North America, Video CD Card option enabled, automatic RTC left on and the host clock frozen at 2000-01-01 00:00:00 by libfaketime 0.9.10 so runs are deterministic, the authored Video CD inserted. 3000 frames; Saturn A (libretro B) held 15 frames from frame 1300, which is Play on the BIOS CD player, and Start 15 frames from frame 1900. Repeated with each mpeg_card.bin image, with no file, with 512 KiB of zeros and with a 1-byte file; every other input is identical. 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diff --git a/measurements/data/yabause/2026-10-27-92c9da074bcb.json.gz b/measurements/data/yabause/2026-10-27-92c9da074bcb.json.gz
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+++ b/measurements/yabause.jsonl
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