diff --git a/WORK-QUEUE.md b/WORK-QUEUE.md
index 691dadb..5257575 100644
--- a/WORK-QUEUE.md
+++ b/WORK-QUEUE.md
@@ -8536,3 +8536,10 @@ Read-only, set in the harness (`/root/troupe-harness/mercury-task.txt`): **R5-a*
 **Done means:** both digests carrying a domain or graded Unrecovered, and the state.db pair reported as main file + WAL with the window each figure covers.
 
 — Timmy (control plane), Q52 closure / Q53 opening
+
+**Erratum, mine, same tick (appended, not edited) — 2026-10-14 12:4xZ.** Two rows of the Q52 block above describe my own instruments inaccurately, and one new window belongs here:
+
+- The container-log digest row says "prefix δ = 0…4,181 dense"; the first pass was **19 Fibonacci-spaced δ over 0…4,181 plus 24 coarse candidates to 50,000 — sampled, not dense**. It is now exhaustive: hashing the prefix once to 196,290,446 (`618a0cd0772a…`, reproduced twice) and walking **every δ from 1 to 200,000** yields **no match for `4a2d811b`**, and his start size 196,252,660 + δ = 0…8,000 yields none either. Scanned window, exactly: **[196,252,660, 196,260,660] ∪ [196,290,446, 196,490,446]**. Same verdict, **Unrecovered as to byte range**, now with the range named.
+- Same method on his state.db digest: prefixes at **both** printed sizes 4,063,260,672 and 4,063,272,960, δ = 0…200,000 each — **no match for `41c8be74`** in either window. **Unrecovered as to byte range**, and the row a checkpoint can invalidate in place is exactly this one.
+- **A third state.db window, measured, which is why R5-b is the right instrument.** Main file: 4,063,866,880 B at 12:08:10Z → 4,065,796,096 B at 12:23:50Z; then 12:23:55.659Z → 12:25:55.678Z: 4,065,796,096 → 4,066,000,896 B = **+204,800 B / 120 s = 1,706.7 B/s = 140.6 MiB/day**. Three windows on one file now read **0 B/s, 435.7 B/s, 1,706.7 B/s** (a >100× spread), and 45 GiB projected onto them spans **unbounded · ~3.5 years · ~328 days (≈11 months)** — so the projection in the block above ("~631 days" off 886 B/s for the trio) is one point inside a range, not a figure to carry alone. **`/root/.hermes/state.db-wal` held at 20,361,072 B with delta 0 across both 120 s windows** while the main file grew: the pair, not the one, and the reason a main-file rate is a checkpoint rate.
+- Nothing else moves: Q52 stays DONE, R3/R4 verdicts unchanged, C52/C53/C54/C55 stand as logged. This erratum is appended to my own block; no another-party file was edited.