Correct September 1 finish time to 14:13

CHANGELOG.md

@@ -2,6 +2,32 @@
 
 ## Unreleased
 
+### September 1 finish-time correction
+
+- Corrected the creator-supplied finish label for the complete 12-fragment
+  drawing sequence from September 1, 2026 at `02:13` to `14:13`
+  `America/New_York`. Tim confirmed that the whole drawing finished at 14:13,
+  and the physical inscription reads `2:13 PM ET`. A separate start-reference
+  image displays `10:26`; it is start evidence, not finish evidence.
+- Renamed exactly `Rec01`-`Rec12` from
+  `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.RecNN.mp4`
+  to
+  `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.RecNN.mp4`
+  by server-side copy/rename, and updated the same 12 active metadata times
+  from `02:13` to `14:13` plus their active `SHA256SUMS` paths.
+- Preserved all 12 `record_id` values, ordinary SHA-256 values, Hub Xet
+  identities, byte sizes, sequence order, acquisition-protocol assignments,
+  and media bytes. The exact mapping is recorded in
+  [`finish_time_correction.csv`](Standard_Time_Lapses/Provenance/Corrections/2026-09-01.1413-finish-time/finish_time_correction.csv).
+- Kept the revision-pinned `2026-09-02` relationship packet, Recording Timing
+  v1 bundle, and existing release artifacts byte-identical. Their `02:13`
+  paths, labels, and 43,221-second conflict remain historical evidence. Against
+  the corrected active `14:13` finish minute, the retained final MP4 boundary
+  is 21 seconds later.
+- Added a focused provenance record and correction-aware validation. No
+  photograph or photograph hash is published or asserted, and this correction
+  creates no release tag or DOI.
+
 ### September 17 11:40 complete drawing-sequence ingestion
 
 - Added 23 creator-confirmed, unchanged canonical Framelapse source fragments

SCHEMA.md

@@ -305,6 +305,47 @@ protocol value. A dated sidecar does not introduce `work_id`, change any
 `RecNN` row absent from these dated sidecars retains
 `standard-2025-07-13`; absence does not establish that no relationship exists.
 
+## Active correction records
+
+Focused corrections that change an active canonical path or documented finish
+label without changing the represented media object are stored under
+`Standard_Time_Lapses/Provenance/Corrections/`. They are separate from dated,
+revision-pinned relationship packets and release receipts, whose bytes and
+historical claims remain immutable.
+
+The September 1 correction ledger is
+`Corrections/2026-09-01.1413-finish-time/finish_time_correction.csv`:
+
+| Field | Type | Meaning |
+| --- | --- | --- |
+| `record_id` | string | Persistent canonical identity; the active and historical rows must describe the same object. |
+| `sequence_position` | integer | Original one-based position, retained unchanged. |
+| `old_file_path` | string | Exact path in the pinned historical packets and metadata receipt. |
+| `new_file_path` | string | Exact corrected path in the active metadata and payload manifest. |
+| `old_finish_date` | `YYYY-MM-DD` | Historical documented finish date. |
+| `old_finish_time` | `HH:MM` | Historical documented finish time. |
+| `new_finish_date` | `YYYY-MM-DD` | Corrected active documented finish date. |
+| `new_finish_time` | `HH:MM` | Corrected active documented finish time. |
+| `sha256` | string | Unchanged ordinary byte-level media SHA-256. |
+| `hub_xet_hash` | string | Unchanged Hub Xet identity. |
+| `size_bytes` | integer | Unchanged media byte size. |
+| `acquisition_protocol_version` | enum | Unchanged protocol assignment. |
+
+Each row must map one unique `record_id`, old path, and new path. Validation
+must require an exact active join on the new path/date/time and unchanged
+identity fields; it must also require an exact historical join on the old
+path/date/time at the pinned source revision. A correction ledger cannot add or
+remove records, reorder a sequence, replace media, or rewrite historical
+evidence.
+
+When a fixed historical metadata receipt overlaps an active correction,
+receipt validation reconstructs the historical bytes by applying the exact
+inverse of the declared correction rows in memory. The reconstructed fixed
+rows must match the original receipt exactly, and any later current rows must
+remain append-only. This is narrower than accepting general edits to the
+historical prefix: an undeclared difference, a changed identity field, or a
+mapping that does not round-trip is an error.
+
 ## Recording-timing sidecar
 
 `Standard_Time_Lapses/Provenance/Recording_Timing/recording_timing.csv` is an
@@ -313,11 +354,13 @@ timing-v1 source sidecars dated `2026-08-27` through `2026-09-02`. It joins to t
 and declares the exact source Hub revision. It is outside both active video
 indexes and does not add or replace canonical metadata fields.
 
-Timing v1's source revision and 186-row membership are fixed. Later canonical
-metadata may grow only after the exact historical 549-row source bytes; those
-appended rows must pass the canonical metadata validator and remain outside
-timing coverage until a separately reviewed, versioned timing layer includes
-them.
+Timing v1's source revision, packet bytes, and 186-row membership are fixed.
+Current metadata compatibility is established by exact inverse reconstruction
+of the 12 documented September 1 path/time corrections to the historical
+549-row receipt, followed by append-only rows with the same 29-field schema.
+Those appended rows must pass the canonical metadata validator and remain
+outside timing coverage until a separately reviewed, versioned timing layer
+includes them.
 
 The sidecar keeps three timing concepts separate:
 
@@ -399,8 +442,9 @@ Before publication, the validator must confirm:
 - relationship paths, Xet identities, sizes, and canonical `record_id` joins
   resolve at the exact declared `source_hub_revision`
 - recording-timing identities, direct timestamp arithmetic, calibration
-  formulas, sequence chronology, retained conflicts, and bundle hashes resolve
-  at the exact declared source revision
+  formulas, sequence chronology, retained historical conflicts, correction
+  round-trips, unchanged media identities, and bundle hashes resolve at the
+  exact declared source revision and current active index
 - `SHA256SUMS` exactly covers every published MP4 and ZIP at the reviewed
   revision, with no missing, extra, duplicate, or mismatched entries
 

SHA256SUMS

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-a638717b49b2eb8a14c36a62cb8cada19105e2e4cdf907c5c2f053ac8ea3d335  Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec12.mp4
 1b42004b601d7b4a3f616cf4d406325bc8d5ad7e63143b3e4af1477100bc4c09  Standard_Time_Lapses/2026-09-01.0237.BallpointPen.Ink.Paper.9x12.Rec01.mp4
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Standard_Time_Lapses/Provenance/Corrections/2026-09-01.1413-finish-time/README.md

@@ -0,0 +1,62 @@
+# September 1, 2026 finish-time correction
+
+This record documents one active-label correction for a creator-confirmed
+complete drawing represented by 12 canonical fragments. Tim confirmed that the
+whole drawing finished September 1, 2026 at `14:13` in
+`America/New_York`. The physical inscription reads `2:13 PM ET`.
+
+A separate start-reference image displays `10:26`. It is evidence about the
+start, not the finish, and is not used to set the canonical finish label. The
+photographs remain private evidence: neither image nor any photograph hash is
+published or asserted by this record.
+
+## Active correction
+
+The active metadata date remains `2026-09-01`; the active finish time changes
+from `02:13` to `14:13`. Each canonical path changes only in its `HHMM` field,
+from `0213` to `1413`. The complete machine-readable mapping, including the
+ordinary media SHA-256, Hub Xet identity, byte size, and acquisition protocol,
+is [`finish_time_correction.csv`](finish_time_correction.csv).
+
+| `record_id` | Position | Historical path | Active corrected path |
+| --- | ---: | --- | --- |
+| `tla-bed24891b6405ece` | 1 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec01.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec01.mp4` |
+| `tla-20bdc620313bd618` | 2 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec02.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec02.mp4` |
+| `tla-00cf93bdb9a0abbc` | 3 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec03.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec03.mp4` |
+| `tla-11747a288c538e27` | 4 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec04.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec04.mp4` |
+| `tla-f26a33cb42e6a4f0` | 5 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec05.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec05.mp4` |
+| `tla-f4d8d1ab6ac76973` | 6 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec06.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec06.mp4` |
+| `tla-f92022de10e0e792` | 7 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec07.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec07.mp4` |
+| `tla-5e5239cecc8b4326` | 8 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec08.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec08.mp4` |
+| `tla-0b32e0e8155453e2` | 9 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec09.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec09.mp4` |
+| `tla-ea32a9a1da6befb7` | 10 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec10.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec10.mp4` |
+| `tla-2979342d23ed96ef` | 11 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec11.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec11.mp4` |
+| `tla-26066542f17e7787` | 12 | `Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec12.mp4` | `Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec12.mp4` |
+
+The media move is a server-side copy/rename, not a download, transcode, or
+replacement. All 12 persistent `record_id` values, media bytes, ordinary
+SHA-256 values, Hub Xet identities, byte sizes, sequence positions, sequence
+count, and `standard-2026-08-27` acquisition-protocol assignments remain
+unchanged. The active `SHA256SUMS` entries change paths only.
+
+## Historical evidence boundary
+
+The relationship packet under [`2026-09-02/`](../../2026-09-02/README.md) and
+the [`Recording_Timing/`](../../Recording_Timing/README.md) bundle both pin the
+original source revision. Their `2026-09-01.0213...` paths, `02:13` finish
+labels, hashes, receipts, and validation results remain byte-identical, as do
+all existing release artifacts.
+
+Recording Timing v1 therefore continues to report its historical 43,221-second
+finish-label conflict. That statement describes the pinned snapshot and is not
+silently rewritten. For the active corrected label, the same retained final
+MP4 boundary is `2026-09-01T14:13:21-04:00`, exactly 21 seconds after the
+documented `14:13` finish minute.
+
+Current validation joins the immutable historical packets to active metadata
+by `record_id`, verifies unchanged media identity, and permits only the 12
+old/new path and finish-time pairs declared in the correction CSV. To verify
+the original timing receipt, the validator applies the exact inverse of those
+12 documented corrections in memory and then checks the reconstructed
+historical 549-row snapshot plus append-only current rows. No historical packet
+is edited to make the current join pass.

Standard_Time_Lapses/Provenance/Corrections/2026-09-01.1413-finish-time/finish_time_correction.csv

@@ -0,0 +1,13 @@
+record_id,sequence_position,old_file_path,new_file_path,old_finish_date,old_finish_time,new_finish_date,new_finish_time,sha256,hub_xet_hash,size_bytes,acquisition_protocol_version
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+tla-f4d8d1ab6ac76973,6,Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec06.mp4,Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec06.mp4,2026-09-01,02:13,2026-09-01,14:13,8a011dacab8a873b1091ad3b06bf4114c29d8c8a6180070c17e3a79fa4cb6042,b839d40b825d44fecde3c11b6b8757e71e8abeff9b07f2432174650e451e9c4d,391048554,standard-2026-08-27
+tla-f92022de10e0e792,7,Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec07.mp4,Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec07.mp4,2026-09-01,02:13,2026-09-01,14:13,d560e979a380d3985edb6d175c43ce7d4b6f5e5704b599228cd8f4eb719adb3b,89300c73a2f0a47e8eaaa62e4abc381f5bc79bb4b20933576fb5fb9195861a5e,435578751,standard-2026-08-27
+tla-5e5239cecc8b4326,8,Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec08.mp4,Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec08.mp4,2026-09-01,02:13,2026-09-01,14:13,9807ccce565f261837aaa032ccb995586667f86e82f92dfc6054374a8d699108,b6627b1131ff4ea596ff4e26721f73ca24fccff85d3f9e4de16836009f7a32e5,378384784,standard-2026-08-27
+tla-0b32e0e8155453e2,9,Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec09.mp4,Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec09.mp4,2026-09-01,02:13,2026-09-01,14:13,9a04bea9be1f8d156f69a186214b48946b6639ad6351cff07bc9ac719c3268aa,072a7281c32ba34e421fe402c2ce5ce599452cf81a09c8a3e214042e9f3d1191,452341373,standard-2026-08-27
+tla-ea32a9a1da6befb7,10,Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec10.mp4,Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec10.mp4,2026-09-01,02:13,2026-09-01,14:13,8c773a8ed8a3a4e195d6bc4593d14b654750dc11ef62e2df675e84fc007b7608,07db0f084be4fc784457f4f34e04ad1191fa77dd21ae7b8219c264727f4465a4,476848316,standard-2026-08-27
+tla-2979342d23ed96ef,11,Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec11.mp4,Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec11.mp4,2026-09-01,02:13,2026-09-01,14:13,2ed143f774eb431a501c517f2c52bec39dfad634c8e5672a17e09a1ebd0d1ac1,890fcadab7bf3e81a54556308ee5e4995a14a209b2656aa6c7d5f614cfbb4390,314353761,standard-2026-08-27
+tla-26066542f17e7787,12,Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec12.mp4,Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec12.mp4,2026-09-01,02:13,2026-09-01,14:13,a638717b49b2eb8a14c36a62cb8cada19105e2e4cdf907c5c2f053ac8ea3d335,d5ff25ab63f3a1b80f62532af7f31cc3f63328693714765e5ccfcc421e52012a,403305061,standard-2026-08-27

Standard_Time_Lapses/Provenance/README.md

@@ -4,18 +4,29 @@ This subtree stores supporting historical evidence and relationship tables. It
 is outside both active video indexes and Dataset Viewer configurations; nested
 placement does not make a media object canonical.
 
-Each active metadata row continues to identify one published video object.
+Each active metadata row continues to identify one published video object.
 Relationship sidecars can group those objects without merging their persistent
 `record_id` values or asserting undocumented drawing- or session-level facts.
 
+## Active corrections
+
+- [`Corrections/2026-09-01.1413-finish-time/`](Corrections/2026-09-01.1413-finish-time/README.md)
+  records the exact 12-ID mapping from the historical `2026-09-01.0213...`
+  paths and `02:13` finish label to the active `2026-09-01.1413...` paths and
+  `14:13` finish label. The dated relationship and Recording Timing packets
+  remain immutable revision-pinned evidence; current validators reconcile
+  their historical paths and times through the correction ledger.
+
 ## Cross-date derived layers
 
 - [`Recording_Timing/`](Recording_Timing/README.md) is an exploratory
   revision-pinned timing layer for the 186 canonical fragments in the six dated
   relationship sidecars. It uses 22 retained device-filename start observations
-  to calibrate 164 profile-matched elapsed estimates, preserves one unresolved
-  43,221-second (12:00:21) finish-label conflict, and does not alter canonical
-  metadata or claim drawing-active time.
+  to calibrate 164 profile-matched elapsed estimates, preserves the historical
+  43,221-second (12:00:21) finish-label conflict at its pinned `02:13` source
+  snapshot, and does not alter canonical metadata or claim drawing-active time.
+  The active correction resolves that label to `14:13`, for which the same
+  retained final MP4 boundary is 21 seconds later.
 
 ## Dated layers
 
@@ -87,5 +98,7 @@ outside the retained recordings was captured.
 | [2026-09-16.2043](2026-09-16.2043/fragment_sequence_relationships.csv) | `2026-09-16.2043.Pencil.Graphite.BallpointPen.Ink.Paper.9x12` | 21 | `Rec01`–`Rec21` | `owner_confirmed_complete` |
 | [2026-09-17](2026-09-17/fragment_sequence_relationships.csv) | `2026-09-17.1140.Pencil.Graphite.FountainPen.Ink.Paper.9x12` | 23 | `Rec01`–`Rec23` | `owner_confirmed_complete` |
 
-The packet CSV files remain authoritative for row-level identities, ordering,
-derivative coverage, evidence states, hashes, and pinned source revisions.
+The packet CSV files remain authoritative for their revision-pinned row-level
+identities, ordering, derivative coverage, evidence states, hashes, paths, and
+source revisions. Active path or finish-label corrections are recorded
+separately under [`Corrections/`](Corrections/) and do not rewrite packet bytes.

VALIDATION.md

@@ -1,5 +1,90 @@
 # Validation Report
 
+## Unreleased September 1 finish-time correction
+
+This focused candidate starts from `main` revision
+`2cd6711f0fdc7d10f2378fe0cc49825a4d815ec3`, the merged result of PR #63.
+It changes the active finish label for one complete 12-fragment drawing from
+September 1, 2026 at `02:13` to `14:13` `America/New_York`. Tim directly
+confirmed the whole-drawing finish, and the physical inscription reads
+`2:13 PM ET`. The separate start-reference image displays `10:26` and is not
+finish evidence. Neither photograph nor any photograph hash is published or
+asserted.
+
+The exact record-ID, old/new path, old/new finish timestamp, and unchanged
+identity mapping is in
+[`finish_time_correction.csv`](Standard_Time_Lapses/Provenance/Corrections/2026-09-01.1413-finish-time/finish_time_correction.csv).
+The 12 media objects are renamed server-side; the corpus is not downloaded or
+re-uploaded.
+
+| Focused check | Required/local candidate result |
+| --- | ---: |
+| Correction rows / unique persistent IDs | 12 / 12 |
+| Old active `0213` paths / new active `1413` paths | 0 / 12 |
+| Corrected metadata rows at `2026-09-01 14:13` | 12 |
+| Active `SHA256SUMS` old/new paths | 0 / 12 |
+| Ordinary SHA-256 / Xet identity / size preserved | 12 / 12 / 12 |
+| Sequence positions / count / protocol preserved | `Rec01`-`Rec12` / 12 / `standard-2026-08-27` |
+| Standard / Pre-Standard / total active records | 673 / 128 / 801 (unchanged from PR #63) |
+| September 2 relationship packet | unchanged; pinned historical paths retained |
+| Recording Timing v1 bundle | 9 files unchanged (8 payloads verified by `bundle.sha256`); 186 rows and 25 groups retained |
+| Existing release receipts, tags, and DOI | unchanged |
+| Historical/current final-boundary cross-check | `+43,221` seconds at pinned `02:13`; `+21` seconds at active `14:13` |
+
+On the local pre-publication candidate, `validate_metadata.py` reports zero
+errors across 801 active rows, `validate_recording_timing.py` reports `ok` with
+12 documented correction rows and 12 corrected checksum paths, and the
+dependency-free regression suite passes 69/69 tests. Remote inventory and
+Viewer results are intentionally deferred until immutable PR and merge
+revisions exist.
+
+The historical `2026-09-02` relationship packet and Recording Timing v1
+bundle remain byte-identical. Their old paths, `02:13` label, and 43,221-second
+conflict describe their immutable pinned snapshots. Current validation joins
+those rows by `record_id`, requires the correction ledger's exact old/new
+path-and-time pairs, and verifies that SHA-256, Xet identity, byte size,
+sequence order, and protocol assignment did not change. The same retained
+final MP4 boundary is `2026-09-01T14:13:21-04:00`, 21 seconds after the active
+corrected finish minute.
+
+The timing validator no longer requires the current file to contain a
+literally unchanged 549-row prefix. It applies the exact inverse of the 12
+documented corrections to an in-memory copy of the current fixed rows and
+requires the reconstructed bytes and SHA-256 to equal the original historical
+receipt. Rows after that reconstructed receipt remain append-only, and every
+undeclared difference still fails. This preserves the original snapshot
+receipts and media identities instead of disabling their checks.
+
+Run the focused and repository-wide checks before publishing the PR, repeat
+them against the immutable PR head after reconciling the latest `main`, and
+repeat the inventory and Viewer checks after merge:
+
+```bash
+python tools/validate_recording_timing.py --root .
+python tools/validate_metadata.py metadata.csv \
+  --pre-standard-metadata Pre_Standard_Time_Lapses/metadata.csv \
+  --fragment-relationships-root Standard_Time_Lapses/Provenance
+python -m unittest discover -s tools -p "test_*.py" -v
+
+python tools/capture_hub_inventory.py \
+  --repo-json repo_api_blobs.json \
+  --repo-id maxwellinked/time-lapse-artifacts \
+  --revision "<immutable-pr-or-merge-commit>" \
+  --output repo_inventory_xet.json \
+  --validation-file metadata.csv \
+  --validation-file Pre_Standard_Time_Lapses/metadata.csv
+python tools/validate_sha256sums.py SHA256SUMS \
+  --repo-json repo_inventory_xet.json \
+  --revision "<same-immutable-commit>"
+```
+
+Post-merge acceptance additionally requires the Dataset Viewer to return the
+same 12 `record_id` values with `time = 14:13` and the corresponding
+`2026-09-01.1413...Rec01`-`Rec12` paths, with no old active `0213` path. The PR,
+merge commit, immutable inventory receipts, validator totals, and Viewer result
+are recorded only after those remote objects exist. No release tag or DOI is
+created for this correction.
+
 ## Unreleased 2026-09-17 11:40 ingest candidate
 
 The media-only pull-request inventory resolves to immutable revision
@@ -282,21 +367,24 @@ canonical fragments in the six dated relationship sidecars. The included
 validator passed with repository-packet self-consistency scope.
 
 Its 549-row, 370,833-byte canonical metadata receipt remains a historical
-snapshot. The validator requires those exact bytes to remain the prefix of the
-current root `metadata.csv`, including SHA-256
-`d516da7a4341dddf0b2b5ad50f6200f283ea0cdefc6de465882fbc021abfba8a`, while
-permitting rows with the same 29-field header and width and nonblank, globally
-unique `record_id`, `file_name`, and `hub_xet_hash` identities to be appended
-after that prefix. The root metadata validator remains authoritative for the
-rest of the schema. Appended rows remain outside timing v1 coverage until a
-separately reviewed, versioned timing layer includes them.
+snapshot. For the 12 IDs covered by the documented September 1 finish-time
+correction, the validator applies the exact inverse path/time mapping from the
+correction CSV to an in-memory copy of the current fixed rows. The reconstructed
+549-row bytes must equal the original receipt, including SHA-256
+`d516da7a4341dddf0b2b5ad50f6200f283ea0cdefc6de465882fbc021abfba8a`.
+Rows after that reconstructed receipt must retain the same 29-field header and
+width and nonblank, globally unique `record_id`, `file_name`, and
+`hub_xet_hash` identities. The root metadata validator remains authoritative
+for the rest of the schema. Appended rows remain outside timing v1 coverage
+until a separately reviewed, versioned timing layer includes them.
 
 The preserved v1 bundle's `validation_summary.json` still records
 `metadata_csv_sha256_unchanged: true`. That is a historical result from the
 pinned-revision publication check, not a claim that the current whole
 `metadata.csv` keeps the old hash after append. Current compatibility is
-established by the exact historical prefix receipt plus current joins for all
-186 covered records.
+established by exact inverse reconstruction of the historical receipt, the
+declared 12-row correction round-trip, and current identity joins for all 186
+covered records.
 
 | Check | Result |
 | --- | ---: |
@@ -315,16 +403,20 @@ established by the exact historical prefix receipt plus current joins for all
 
 The one retained conflict is
 `2026-09-01.0213.BallpointPen.Ink.Paper.9x12`, whose final MP4 boundary is
-43,221 seconds after the documented finish minute. No timestamp is corrected.
-The 109,973.465-second serialized aggregate mixes 22 observed and 164 estimated
-start-to-finalization intervals; it is neither drawing-active time nor corpus
-calendar span. Calculation before three-decimal row serialization differs by
-0.001667 seconds.
-
-The validator recomputes the historical metadata-prefix receipt, current
-identity joins for all 186 covered records, timestamp arithmetic, row formulas,
-full-precision calibration metrics, sequence chronology, group summaries,
-validation summaries, source receipts, and bundle hashes:
+43,221 seconds after the documented finish minute in the immutable timing-v1
+snapshot. That historical path, time, conflict state, and note are not
+rewritten. The active correction maps those 12 IDs to the `14:13` finish label;
+the same retained final MP4 boundary is then 21 seconds after the corrected
+finish minute. The 109,973.465-second serialized aggregate mixes 22 observed
+and 164 estimated start-to-finalization intervals; it is neither drawing-active
+time nor corpus calendar span. Calculation before three-decimal row
+serialization differs by 0.001667 seconds.
+
+The validator recomputes the inverse-reconstructed historical metadata receipt,
+the exact 12-row correction round-trip, current identity joins for all 186
+covered records, timestamp arithmetic, row formulas, full-precision calibration
+metrics, sequence chronology, group summaries, validation summaries, source
+receipts, and bundle hashes:
 
 ```bash
 python tools/validate_recording_timing.py --root .
@@ -637,19 +729,22 @@ visual authentication of absent media.
 
 ## Regression tests
 
-The dependency-free suites currently run 62 tests covering repository receipt
+The dependency-free suites currently run 69 tests covering repository receipt
 binding, fragment-size joins and verification levels, semantic documentation,
 recognized filename-tool coverage, derived headline facts, archive-origin
 framing, the exact protocol-version boundary and prospective timestamp scope,
 verified-download and Pre-Standard enrichment behavior, and physical-reference
 identity, hash-state, pairing, manifest, metadata-join failures, and
-append-compatible recording-timing receipts.
+append-compatible recording-timing receipts. Focused timing tests also reject
+correction-row count or identity drift, active metadata drift, historical
+relationship-packet mutation, non-LF metadata serialization, altered active
+checksum values, and retained old checksum paths.
 
 ```bash
 python -m unittest discover -s tools -p "test_*.py"
 ```
 
-Result: **62/62 passed**.
+Result: **69/69 passed**.
 
 ## Outstanding curator questions and limitations
 

metadata.csv

@@ -474,18 +474,6 @@ Standard_Time_Lapses/2026-08-31.1212.BallpointPen.Ink.Paper.9x12.Rec08.mp4,tla-9
 Standard_Time_Lapses/2026-08-31.1212.BallpointPen.Ink.Paper.9x12.Rec09.mp4,tla-53c843f22fb33003,standard,true,standard-2026-08-27,2026-08-31,12:12,BallpointPen,Ink,Paper,9x12,33.133,3840,2160,landscape,30.000302,hevc,yuvj420p,mp4,False,e47c3ae50d9600c4900683f72b29303a7f2d91f8366088e87df0834627338f05,,direct_root_upload,,,manual_confirmation,,168984528,"Creator-confirmed untouched Framelapse source fragment 9 of 11 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-08-31; the container reports 994 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
 Standard_Time_Lapses/2026-08-31.1212.BallpointPen.Ink.Paper.9x12.Rec10.mp4,tla-731496e7b09037d3,standard,true,standard-2026-08-27,2026-08-31,12:12,BallpointPen,Ink,Paper,9x12,52.3661,3840,2160,landscape,30.000299,hevc,yuvj420p,mp4,False,f4718138b778b58eb899703130556d5fe3cb98cfa7128f696f1d573f9ca6147f,,direct_root_upload,,,manual_confirmation,,266710415,"Creator-confirmed untouched Framelapse source fragment 10 of 11 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-08-31; the container reports 1,571 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
 Standard_Time_Lapses/2026-08-31.1212.BallpointPen.Ink.Paper.9x12.Rec11.mp4,tla-1b8df109b4192788,standard,true,standard-2026-08-27,2026-08-31,12:12,BallpointPen,Ink,Paper,9x12,36.532967,3840,2160,landscape,30.000301,hevc,yuvj420p,mp4,False,13ed5c8a15786f92869794a3ea424053f6bd77beb0a9bf96bdfa809ff96dd316,,direct_root_upload,,,manual_confirmation,,186665628,"Creator-confirmed untouched Framelapse source fragment 11 of 11 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-08-31; the container reports 1,096 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec01.mp4,tla-bed24891b6405ece,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,4.833289,3840,2160,landscape,30.000276,hevc,yuvj420p,mp4,False,1ba1321d0570f401c467d83f3e02b36079c14d4fbfed9e6a49d9ecfdbacf2b05,,direct_root_upload,,,manual_confirmation,,30498253,"Creator-confirmed untouched Framelapse source fragment 1 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 145 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec02.mp4,tla-20bdc620313bd618,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,87.765789,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,f930b4a37817a049e0137d8f64872ef42cb1330e625119accb137ba1127b48b2,,direct_root_upload,,,manual_confirmation,,447536915,"Creator-confirmed untouched Framelapse source fragment 2 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,633 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec03.mp4,tla-00cf93bdb9a0abbc,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,69.8326,3840,2160,landscape,30.000301,hevc,yuvj420p,mp4,False,6dfcb648de50c86690a683e726dca456469e72201744c11bb666d44e5d724e95,,direct_root_upload,,,manual_confirmation,,355614473,"Creator-confirmed untouched Framelapse source fragment 3 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,095 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec04.mp4,tla-11747a288c538e27,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,63.666,3840,2160,landscape,30.000298,hevc,yuvj420p,mp4,False,6ecfd4375dedcc0e33c9e229ed26a7db8a0e7ae83a8c700b692d49217adb1602,,direct_root_upload,,,manual_confirmation,,323436744,"Creator-confirmed untouched Framelapse source fragment 4 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 1,910 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec05.mp4,tla-f26a33cb42e6a4f0,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,60.4327,3840,2160,landscape,30.000298,hevc,yuvj420p,mp4,False,d435377bebf1029691565fcfcd564dfcc88e096f67820ab1e01a866a803b8213,,direct_root_upload,,,manual_confirmation,,307448450,"Creator-confirmed untouched Framelapse source fragment 5 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 1,813 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec06.mp4,tla-f4d8d1ab6ac76973,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,76.732567,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,b839d40b825d44fecde3c11b6b8757e71e8abeff9b07f2432174650e451e9c4d,,direct_root_upload,,,manual_confirmation,,391048554,"Creator-confirmed untouched Framelapse source fragment 6 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,302 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec07.mp4,tla-f92022de10e0e792,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,85.5658,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,89300c73a2f0a47e8eaaa62e4abc381f5bc79bb4b20933576fb5fb9195861a5e,,direct_root_upload,,,manual_confirmation,,435578751,"Creator-confirmed untouched Framelapse source fragment 7 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,567 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec08.mp4,tla-5e5239cecc8b4326,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,74.199256,3840,2160,landscape,30.000301,hevc,yuvj420p,mp4,False,b6627b1131ff4ea596ff4e26721f73ca24fccff85d3f9e4de16836009f7a32e5,,direct_root_upload,,,manual_confirmation,,378384784,"Creator-confirmed untouched Framelapse source fragment 8 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,226 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec09.mp4,tla-0b32e0e8155453e2,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,88.7991,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,072a7281c32ba34e421fe402c2ce5ce599452cf81a09c8a3e214042e9f3d1191,,direct_root_upload,,,manual_confirmation,,452341373,"Creator-confirmed untouched Framelapse source fragment 9 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,664 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec10.mp4,tla-ea32a9a1da6befb7,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,93.5657,3840,2160,landscape,30.000299,hevc,yuvj420p,mp4,False,07db0f084be4fc784457f4f34e04ad1191fa77dd21ae7b8219c264727f4465a4,,direct_root_upload,,,manual_confirmation,,476848316,"Creator-confirmed untouched Framelapse source fragment 10 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,807 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec11.mp4,tla-2979342d23ed96ef,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,61.699378,3840,2160,landscape,30.000297,hevc,yuvj420p,mp4,False,890fcadab7bf3e81a54556308ee5e4995a14a209b2656aa6c7d5f614cfbb4390,,direct_root_upload,,,manual_confirmation,,314353761,"Creator-confirmed untouched Framelapse source fragment 11 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 1,851 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
-Standard_Time_Lapses/2026-09-01.0213.BallpointPen.Ink.Paper.9x12.Rec12.mp4,tla-26066542f17e7787,standard,true,standard-2026-08-27,2026-09-01,02:13,BallpointPen,Ink,Paper,9x12,79.065878,3840,2160,landscape,30.000299,hevc,yuvj420p,mp4,False,d5ff25ab63f3a1b80f62532af7f31cc3f63328693714765e5ccfcc421e52012a,,direct_root_upload,,,manual_confirmation,,403305061,"Creator-confirmed untouched Framelapse source fragment 12 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,372 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
 Standard_Time_Lapses/2026-09-01.0237.BallpointPen.Ink.Paper.9x12.Rec01.mp4,tla-8f9776522fa0b340,standard,true,standard-2026-08-27,2026-09-01,02:37,BallpointPen,Ink,Paper,9x12,104.3656,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,32b2ea4fd313c10654048942e3e640f97bfb1d36088aff30e27a3a24fef9c308,,direct_root_upload,,,manual_confirmation,,592360990,"Creator-confirmed untouched Framelapse source fragment 1 of 4 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-01; the container reports 3,131 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
 Standard_Time_Lapses/2026-09-01.0237.BallpointPen.Ink.Paper.9x12.Rec02.mp4,tla-2f31f064cddb054e,standard,true,standard-2026-08-27,2026-09-01,02:37,BallpointPen,Ink,Paper,9x12,77.732556,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,02b19c0fabb3df98d95dc61604fd1286328dbb7390952abd7d16620388ccc302,,direct_root_upload,,,manual_confirmation,,396121802,"Creator-confirmed untouched Framelapse source fragment 2 of 4 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-01; the container reports 2,332 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
 Standard_Time_Lapses/2026-09-01.0237.BallpointPen.Ink.Paper.9x12.Rec03.mp4,tla-38d43af9e18859ab,standard,true,standard-2026-08-27,2026-09-01,02:37,BallpointPen,Ink,Paper,9x12,58.8327,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,b8fce207274e64f51f2661da873f7bfbbce58edf39a3cc4ebc6c6ba2855e552d,,direct_root_upload,,,manual_confirmation,,299088500,"Creator-confirmed untouched Framelapse source fragment 3 of 4 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-01; the container reports 1,765 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
@@ -499,6 +487,18 @@ Standard_Time_Lapses/2026-09-01.0619.BallpointPen.Ink.Paper.9x12.Rec06.mp4,tla-b
 Standard_Time_Lapses/2026-09-01.0619.BallpointPen.Ink.Paper.9x12.Rec07.mp4,tla-11225f2077e490e9,standard,true,standard-2026-08-27,2026-09-01,06:19,BallpointPen,Ink,Paper,9x12,87.932456,3840,2160,landscape,30.000299,hevc,yuvj420p,mp4,False,271f9d679d2c186a340acf2325e835c4d7584ea6105afc401094afacf06d2c3d,,direct_root_upload,,,manual_confirmation,,448457456,"Creator-confirmed untouched Framelapse source fragment 7 of 9 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-01; the container reports 2,638 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
 Standard_Time_Lapses/2026-09-01.0619.BallpointPen.Ink.Paper.9x12.Rec08.mp4,tla-1c4552ed0d031b79,standard,true,standard-2026-08-27,2026-09-01,06:19,BallpointPen,Ink,Paper,9x12,95.432378,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,1bba92bc605054bbf7e2750a64233b854d45f9a8b85ec8ae9028ce66099fb79a,,direct_root_upload,,,manual_confirmation,,486491741,"Creator-confirmed untouched Framelapse source fragment 8 of 9 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-01; the container reports 2,863 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
 Standard_Time_Lapses/2026-09-01.0619.BallpointPen.Ink.Paper.9x12.Rec09.mp4,tla-f538f285d08ad1c8,standard,true,standard-2026-08-27,2026-09-01,06:19,BallpointPen,Ink,Paper,9x12,70.765956,3840,2160,landscape,30.000301,hevc,yuvj420p,mp4,False,bf8b62c42351379b3a3d9dd43dd727525181d5c6bb96b14a792012b1fa02f89e,,direct_root_upload,,,manual_confirmation,,360695393,"Creator-confirmed untouched Framelapse source fragment 9 of 9 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-01; the container reports 2,123 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec01.mp4,tla-bed24891b6405ece,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,4.833289,3840,2160,landscape,30.000276,hevc,yuvj420p,mp4,False,1ba1321d0570f401c467d83f3e02b36079c14d4fbfed9e6a49d9ecfdbacf2b05,,direct_root_upload,,,manual_confirmation,,30498253,"Creator-confirmed untouched Framelapse source fragment 1 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 145 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec02.mp4,tla-20bdc620313bd618,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,87.765789,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,f930b4a37817a049e0137d8f64872ef42cb1330e625119accb137ba1127b48b2,,direct_root_upload,,,manual_confirmation,,447536915,"Creator-confirmed untouched Framelapse source fragment 2 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,633 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec03.mp4,tla-00cf93bdb9a0abbc,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,69.8326,3840,2160,landscape,30.000301,hevc,yuvj420p,mp4,False,6dfcb648de50c86690a683e726dca456469e72201744c11bb666d44e5d724e95,,direct_root_upload,,,manual_confirmation,,355614473,"Creator-confirmed untouched Framelapse source fragment 3 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,095 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec04.mp4,tla-11747a288c538e27,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,63.666,3840,2160,landscape,30.000298,hevc,yuvj420p,mp4,False,6ecfd4375dedcc0e33c9e229ed26a7db8a0e7ae83a8c700b692d49217adb1602,,direct_root_upload,,,manual_confirmation,,323436744,"Creator-confirmed untouched Framelapse source fragment 4 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 1,910 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec05.mp4,tla-f26a33cb42e6a4f0,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,60.4327,3840,2160,landscape,30.000298,hevc,yuvj420p,mp4,False,d435377bebf1029691565fcfcd564dfcc88e096f67820ab1e01a866a803b8213,,direct_root_upload,,,manual_confirmation,,307448450,"Creator-confirmed untouched Framelapse source fragment 5 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 1,813 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec06.mp4,tla-f4d8d1ab6ac76973,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,76.732567,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,b839d40b825d44fecde3c11b6b8757e71e8abeff9b07f2432174650e451e9c4d,,direct_root_upload,,,manual_confirmation,,391048554,"Creator-confirmed untouched Framelapse source fragment 6 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,302 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec07.mp4,tla-f92022de10e0e792,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,85.5658,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,89300c73a2f0a47e8eaaa62e4abc381f5bc79bb4b20933576fb5fb9195861a5e,,direct_root_upload,,,manual_confirmation,,435578751,"Creator-confirmed untouched Framelapse source fragment 7 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,567 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec08.mp4,tla-5e5239cecc8b4326,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,74.199256,3840,2160,landscape,30.000301,hevc,yuvj420p,mp4,False,b6627b1131ff4ea596ff4e26721f73ca24fccff85d3f9e4de16836009f7a32e5,,direct_root_upload,,,manual_confirmation,,378384784,"Creator-confirmed untouched Framelapse source fragment 8 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,226 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec09.mp4,tla-0b32e0e8155453e2,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,88.7991,3840,2160,landscape,30.0003,hevc,yuvj420p,mp4,False,072a7281c32ba34e421fe402c2ce5ce599452cf81a09c8a3e214042e9f3d1191,,direct_root_upload,,,manual_confirmation,,452341373,"Creator-confirmed untouched Framelapse source fragment 9 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,664 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec10.mp4,tla-ea32a9a1da6befb7,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,93.5657,3840,2160,landscape,30.000299,hevc,yuvj420p,mp4,False,07db0f084be4fc784457f4f34e04ad1191fa77dd21ae7b8219c264727f4465a4,,direct_root_upload,,,manual_confirmation,,476848316,"Creator-confirmed untouched Framelapse source fragment 10 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,807 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec11.mp4,tla-2979342d23ed96ef,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,61.699378,3840,2160,landscape,30.000297,hevc,yuvj420p,mp4,False,890fcadab7bf3e81a54556308ee5e4995a14a209b2656aa6c7d5f614cfbb4390,,direct_root_upload,,,manual_confirmation,,314353761,"Creator-confirmed untouched Framelapse source fragment 11 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 1,851 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
+Standard_Time_Lapses/2026-09-01.1413.BallpointPen.Ink.Paper.9x12.Rec12.mp4,tla-26066542f17e7787,standard,true,standard-2026-08-27,2026-09-01,14:13,BallpointPen,Ink,Paper,9x12,79.065878,3840,2160,landscape,30.000299,hevc,yuvj420p,mp4,False,d5ff25ab63f3a1b80f62532af7f31cc3f63328693714765e5ccfcc421e52012a,,direct_root_upload,,,manual_confirmation,,403305061,"Creator-confirmed untouched Framelapse source fragment 12 of 12 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,372 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
 Standard_Time_Lapses/2026-09-01.2356.BallpointPen.Ink.Paper.9x12.Rec01.mp4,tla-4bed8123631947db,standard,true,standard-2026-08-27,2026-09-01,23:56,BallpointPen,Ink,Paper,9x12,7.0666,3840,2160,landscape,30.000283,hevc,yuvj420p,mp4,False,4dc544ca9ff7a23c0621550f8c6bd12cea42a64d3744c6293cb5e853247dc53d,,direct_root_upload,,,manual_confirmation,,44499932,"Creator-confirmed untouched Framelapse source fragment 1 of 9 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 212 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
 Standard_Time_Lapses/2026-09-01.2356.BallpointPen.Ink.Paper.9x12.Rec02.mp4,tla-b835b38a4181d6d5,standard,true,standard-2026-08-27,2026-09-01,23:56,BallpointPen,Ink,Paper,9x12,61.399389,3840,2160,landscape,30.000299,hevc,yuvj420p,mp4,False,9b7c19847b64e9e7457bea93c9aae6d05783cf6bf0d5081290910333c6ffcc60,,direct_root_upload,,,manual_confirmation,,347211391,"Creator-confirmed untouched Framelapse source fragment 2 of 9 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 1,842 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."
 Standard_Time_Lapses/2026-09-01.2356.BallpointPen.Ink.Paper.9x12.Rec03.mp4,tla-b34572c8517ac79e,standard,true,standard-2026-08-27,2026-09-01,23:56,BallpointPen,Ink,Paper,9x12,79.165878,3840,2160,landscape,30.000299,hevc,yuvj420p,mp4,False,b43b0b9c82f9501eabe7bf55fe0e84b15bca8c7c4a13c4d7222da8b55474330d,,direct_root_upload,,,manual_confirmation,,402639371,"Creator-confirmed untouched Framelapse source fragment 3 of 9 in an owner-confirmed complete drawing sequence. At ingest audit, the source bore its canonical archive filename; an earlier device filename is not documented. Local SHA-256 matched the retained pre-upload inventory. Complete packet-stream demux and sampled start/middle/end decoding passed on 2026-09-02; the container reports 2,375 video frames. Stored as 3840x2160 landscape HEVC with -90-degree display rotation. The literal container tag com.android.capture.fps=5.000000 is recorded without inferring real drawing time. RecNN records sequence only."

tools/test_recording_timing.py

@@ -20,6 +20,10 @@ VALIDATOR = TOOLS / "validate_recording_timing.py"
 TIMING_RELATIVE = Path(
     "Standard_Time_Lapses/Provenance/Recording_Timing"
 )
+CORRECTION_RELATIVE = Path(
+    "Standard_Time_Lapses/Provenance/Corrections/"
+    "2026-09-01.1413-finish-time/finish_time_correction.csv"
+)
 RELATIONSHIP_DATES = (
     "2026-08-27",
     "2026-08-29",
@@ -90,6 +94,7 @@ class RecordingTimingValidatorTests(unittest.TestCase):
 
     def copy_fixture(self, destination: Path) -> Path:
         shutil.copy2(REPO_ROOT / "metadata.csv", destination / "metadata.csv")
+        shutil.copy2(REPO_ROOT / "SHA256SUMS", destination / "SHA256SUMS")
         timing_destination = destination / TIMING_RELATIVE
         timing_destination.parent.mkdir(parents=True, exist_ok=True)
         shutil.copytree(REPO_ROOT / TIMING_RELATIVE, timing_destination)
@@ -100,6 +105,9 @@ class RecordingTimingValidatorTests(unittest.TestCase):
             target = destination / relative
             target.parent.mkdir(parents=True, exist_ok=True)
             shutil.copy2(REPO_ROOT / relative, target)
+        correction_target = destination / CORRECTION_RELATIVE
+        correction_target.parent.mkdir(parents=True, exist_ok=True)
+        shutil.copy2(REPO_ROOT / CORRECTION_RELATIVE, correction_target)
         return timing_destination
 
     def test_current_repository_packet_passes(self) -> None:
@@ -108,6 +116,151 @@ class RecordingTimingValidatorTests(unittest.TestCase):
         summary = json.loads(completed.stdout)
         self.assertEqual(summary["status"], "ok")
         self.assertEqual(summary["timing_rows"], 186)
+        self.assertEqual(summary["documented_correction_rows"], 12)
+        self.assertEqual(
+            summary["active_corrected_finish_crosscheck"],
+            {
+                "fragment_set_label": (
+                    "2026-09-01.1413.BallpointPen.Ink.Paper.9x12"
+                ),
+                "delta_seconds": 21.0,
+                "status": "near_documented_finish_minute",
+            },
+        )
+
+    def test_correction_requires_exact_row_count_and_historical_ids(self) -> None:
+        with tempfile.TemporaryDirectory(prefix="tla-timing-correction-count-") as temp_dir:
+            root = Path(temp_dir)
+            self.copy_fixture(root)
+            correction_path = root / CORRECTION_RELATIVE
+            fieldnames, rows = read_csv_table(correction_path)
+            self.assertEqual(len(rows), 12)
+            write_csv_table(correction_path, fieldnames, rows[:-1])
+            completed = self.run_validator(root)
+
+        self.assertNotEqual(completed.returncode, 0)
+        self.assertIn("expected 12 correction rows, found 11", completed.stdout)
+        self.assertIn(
+            "finish_time_correction.csv record IDs differ from the affected "
+            "Sep-02 relationship rows",
+            completed.stdout,
+        )
+
+    def test_correction_identity_tamper_is_rejected(self) -> None:
+        with tempfile.TemporaryDirectory(prefix="tla-timing-correction-tamper-") as temp_dir:
+            root = Path(temp_dir)
+            self.copy_fixture(root)
+            correction_path = root / CORRECTION_RELATIVE
+            fieldnames, rows = read_csv_table(correction_path)
+            rows[0]["sha256"] = "0" * 64
+            write_csv_table(correction_path, fieldnames, rows)
+            completed = self.run_validator(root)
+
+        self.assertNotEqual(completed.returncode, 0)
+        self.assertIn(
+            "documented correction position 1: sha256 differs from Sep-02 relationship",
+            completed.stdout,
+        )
+
+    def test_corrected_current_metadata_drift_is_rejected(self) -> None:
+        with tempfile.TemporaryDirectory(prefix="tla-timing-corrected-drift-") as temp_dir:
+            root = Path(temp_dir)
+            self.copy_fixture(root)
+            correction_path = root / CORRECTION_RELATIVE
+            _, corrections = read_csv_table(correction_path)
+            metadata_path = root / "metadata.csv"
+            fieldnames, rows = read_csv_table(metadata_path)
+            target = next(
+                row for row in rows if row["record_id"] == corrections[0]["record_id"]
+            )
+            target["time"] = "14:12"
+            write_csv_table(metadata_path, fieldnames, rows)
+            completed = self.run_validator(root)
+
+        self.assertNotEqual(completed.returncode, 0)
+        self.assertIn(
+            "documented correction position 1: current metadata time differs",
+            completed.stdout,
+        )
+
+    def test_current_metadata_must_use_deterministic_lf_serialization(self) -> None:
+        with tempfile.TemporaryDirectory(prefix="tla-timing-metadata-crlf-") as temp_dir:
+            root = Path(temp_dir)
+            self.copy_fixture(root)
+            metadata_path = root / "metadata.csv"
+            payload = metadata_path.read_bytes()
+            self.assertNotIn(b"\r\n", payload)
+            metadata_path.write_bytes(payload.replace(b"\n", b"\r\n"))
+            completed = self.run_validator(root)
+
+        self.assertNotEqual(completed.returncode, 0)
+        self.assertIn(
+            "metadata.csv is not deterministic UTF-8 CSV with LF line endings",
+            completed.stdout,
+        )
+
+    def test_active_sha256sum_hash_tamper_is_rejected(self) -> None:
+        with tempfile.TemporaryDirectory(prefix="tla-timing-sha-hash-") as temp_dir:
+            root = Path(temp_dir)
+            self.copy_fixture(root)
+            _, corrections = read_csv_table(root / CORRECTION_RELATIVE)
+            correction = corrections[0]
+            manifest_path = root / "SHA256SUMS"
+            lines = manifest_path.read_text(encoding="utf-8").splitlines()
+            expected_suffix = f"  {correction['new_file_path']}"
+            matches = [index for index, line in enumerate(lines) if line.endswith(expected_suffix)]
+            self.assertEqual(len(matches), 1)
+            lines[matches[0]] = f"{'0' * 64}{expected_suffix}"
+            manifest_path.write_text(
+                "\n".join(lines) + "\n", encoding="utf-8", newline="\n"
+            )
+            completed = self.run_validator(root)
+
+        self.assertNotEqual(completed.returncode, 0)
+        self.assertIn(
+            "documented correction position 1: active SHA256SUMS path/hash differs",
+            completed.stdout,
+        )
+
+    def test_old_path_must_be_absent_from_active_sha256sums(self) -> None:
+        with tempfile.TemporaryDirectory(prefix="tla-timing-sha-old-path-") as temp_dir:
+            root = Path(temp_dir)
+            self.copy_fixture(root)
+            _, corrections = read_csv_table(root / CORRECTION_RELATIVE)
+            correction = corrections[0]
+            manifest_path = root / "SHA256SUMS"
+            with manifest_path.open("a", encoding="utf-8", newline="") as handle:
+                handle.write(
+                    f"{correction['sha256']}  {correction['old_file_path']}\n"
+                )
+            completed = self.run_validator(root)
+
+        self.assertNotEqual(completed.returncode, 0)
+        self.assertIn(
+            "documented correction position 1: old path remains in active SHA256SUMS",
+            completed.stdout,
+        )
+
+    def test_historical_relationship_packet_mutation_is_rejected(self) -> None:
+        with tempfile.TemporaryDirectory(prefix="tla-timing-historical-packet-") as temp_dir:
+            root = Path(temp_dir)
+            self.copy_fixture(root)
+            relationship_path = root / (
+                "Standard_Time_Lapses/Provenance/2026-09-02/"
+                "fragment_sequence_relationships.csv"
+            )
+            fieldnames, rows = read_csv_table(relationship_path)
+            rows[0]["notes"] += " Synthetic historical mutation."
+            write_csv_table(relationship_path, fieldnames, rows)
+            completed = self.run_validator(root)
+
+        self.assertNotEqual(completed.returncode, 0)
+        self.assertIn(
+            "relationship sidecar SHA-256 mismatch: "
+            "Standard_Time_Lapses/Provenance/2026-09-02/"
+            "fragment_sequence_relationships.csv",
+            completed.stdout,
+        )
 
     def test_unrelated_appended_metadata_row_is_accepted(self) -> None:
         with tempfile.TemporaryDirectory(prefix="tla-timing-append-") as temp_dir:
@@ -134,7 +287,7 @@ class RecordingTimingValidatorTests(unittest.TestCase):
         self.assertEqual(summary["current_metadata_rows"], len(rows) + 1)
         self.assertEqual(
             summary["metadata_receipt_mode"],
-            "immutable_prefix_with_append_only_rows",
+            "inverse_documented_correction_then_exact_pinned_snapshot",
         )
 
     def test_missing_covered_metadata_row_is_rejected(self) -> None:
@@ -217,7 +370,7 @@ class RecordingTimingValidatorTests(unittest.TestCase):
 
         self.assertNotEqual(completed.returncode, 0)
         self.assertIn(
-            "metadata.csv pinned prefix differs from the source_manifest receipt",
+            "reconstructed pinned metadata snapshot differs from the source_manifest receipt",
             completed.stdout,
         )
 

tools/validate_recording_timing.py

@@ -90,6 +90,21 @@ GROUP_FIELDS = [
     "notes",
 ]
 
+CORRECTION_FIELDS = [
+    "record_id",
+    "sequence_position",
+    "old_file_path",
+    "new_file_path",
+    "old_finish_date",
+    "old_finish_time",
+    "new_finish_date",
+    "new_finish_time",
+    "sha256",
+    "hub_xet_hash",
+    "size_bytes",
+    "acquisition_protocol_version",
+]
+
 MODEL_ID = "tla-framelapse-android14-tag5-empirical-v1"
 MODEL_INTERCEPT = Decimal("0.8")
 MODEL_FRAME_NUMERATOR = Decimal(7)
@@ -113,6 +128,13 @@ EXPECTED_SOURCE_SCHEMA_SHA256 = "3624d5858bd4c0df796775ee6400106eb146101acbf112a
 EXPECTED_SOURCE_SCHEMA_SIZE = 19411
 EXPECTED_CONFLICT_GROUP = "2026-09-01.0213.BallpointPen.Ink.Paper.9x12"
 EXPECTED_CONFLICT_DELTA = Decimal(43221)
+EXPECTED_CORRECTED_GROUP = "2026-09-01.1413.BallpointPen.Ink.Paper.9x12"
+EXPECTED_CORRECTED_DELTA = Decimal(21)
+EXPECTED_CORRECTION_ROWS = 12
+CORRECTION_RELATIVE_PATH = Path(
+    "Standard_Time_Lapses/Provenance/Corrections/"
+    "2026-09-01.1413-finish-time/finish_time_correction.csv"
+)
 EXPECTED_RELATIONSHIP_PATHS = {
     f"Standard_Time_Lapses/Provenance/{date}/fragment_sequence_relationships.csv"
     for date in (
@@ -156,17 +178,36 @@ def sha256_file(path: Path) -> str:
     return digest.hexdigest()
 
 
-def read_csv_bytes(
-    payload: bytes, label: str
-) -> tuple[list[str], list[dict[str, str]]]:
-    try:
-        text = payload.decode("utf-8-sig")
-    except UnicodeDecodeError as error:
-        raise ValueError(f"invalid UTF-8 CSV bytes for {label}") from error
-    reader = csv.DictReader(io.StringIO(text))
-    if not reader.fieldnames:
-        raise ValueError(f"missing CSV header: {label}")
-    return list(reader.fieldnames), list(reader)
+def serialize_csv_bytes(
+    fieldnames: list[str], rows: list[dict[str, str]]
+) -> bytes:
+    output = io.StringIO(newline="")
+    writer = csv.DictWriter(
+        output, fieldnames=fieldnames, lineterminator="\n"
+    )
+    writer.writeheader()
+    writer.writerows(rows)
+    return output.getvalue().encode("utf-8")
+
+
+def read_sha256_manifest(path: Path, errors: list[str]) -> dict[str, str]:
+    entries: dict[str, str] = {}
+    if not path.is_file():
+        errors.append("root SHA256SUMS is missing")
+        return entries
+    for line_number, line in enumerate(
+        path.read_text(encoding="utf-8").splitlines(), start=1
+    ):
+        match = re.fullmatch(r"([0-9a-f]{64})  (\S.*)", line)
+        if not match:
+            errors.append(f"SHA256SUMS line {line_number}: malformed entry")
+            continue
+        digest, file_path = match.groups()
+        if file_path in entries:
+            errors.append(f"SHA256SUMS: duplicate path {file_path}")
+            continue
+        entries[file_path] = digest
+    return entries
 
 
 def parse_decimal(text: str, label: str, errors: list[str]) -> Decimal | None:
@@ -332,51 +373,6 @@ def validate_source_receipts(
         return []
     if canonical_metadata != EXPECTED_CANONICAL_METADATA_RECEIPT:
         errors.append("source_manifest canonical metadata receipt differs")
-    metadata_path = root / EXPECTED_CANONICAL_METADATA_RECEIPT["file_path"]
-    if not metadata_path.is_file():
-        errors.append(f"current metadata source is missing: {metadata_path}")
-        return []
-    metadata_bytes = metadata_path.read_bytes()
-    receipt_size = int(EXPECTED_CANONICAL_METADATA_RECEIPT["size_bytes"])
-    receipt_rows = int(EXPECTED_CANONICAL_METADATA_RECEIPT["row_count"])
-    receipt_fields = int(EXPECTED_CANONICAL_METADATA_RECEIPT["field_count"])
-    if len(metadata_bytes) < receipt_size:
-        errors.append("metadata.csv is shorter than the pinned source_manifest receipt")
-        pinned_prefix = metadata_bytes
-    else:
-        pinned_prefix = metadata_bytes[:receipt_size]
-    if (
-        hashlib.sha256(pinned_prefix).hexdigest()
-        != EXPECTED_CANONICAL_METADATA_RECEIPT["sha256"]
-    ):
-        errors.append("metadata.csv pinned prefix differs from the source_manifest receipt")
-    try:
-        pinned_fields, pinned_rows = read_csv_bytes(
-            pinned_prefix, "metadata.csv pinned prefix"
-        )
-    except ValueError as error:
-        errors.append(str(error))
-        pinned_fields, pinned_rows = [], []
-    metadata_fields, metadata_rows = read_csv(metadata_path)
-    if len(pinned_fields) != receipt_fields:
-        errors.append(
-            "metadata.csv pinned prefix field count differs from the "
-            "source_manifest receipt"
-        )
-    if len(pinned_rows) != receipt_rows:
-        errors.append(
-            "metadata.csv pinned prefix row count differs from the "
-            "source_manifest receipt"
-        )
-    if metadata_fields != pinned_fields:
-        errors.append("metadata.csv current field contract differs from the pinned prefix")
-    if len(metadata_rows) < receipt_rows:
-        errors.append("metadata.csv current row count is below the pinned source snapshot")
-    if len(metadata_bytes) > receipt_size and len(metadata_rows) == receipt_rows:
-        errors.append("metadata.csv has appended bytes without appended rows")
-    for row_number, row in enumerate(metadata_rows, start=2):
-        if None in row or any(value is None for value in row.values()):
-            errors.append(f"metadata.csv row {row_number} has malformed field width")
 
     source_snapshot_schema = manifest.get("source_snapshot_schema")
     if not isinstance(source_snapshot_schema, dict):
@@ -427,6 +423,259 @@ def validate_source_receipts(
     return relationship_rows
 
 
+def validate_correction_bridge(
+    root: Path,
+    metadata_fields: list[str],
+    metadata_rows: list[dict[str, str]],
+    timing_rows: list[dict[str, str]],
+    errors: list[str],
+) -> dict[str, dict[str, str]]:
+    correction_path = root / CORRECTION_RELATIVE_PATH
+    if not correction_path.is_file():
+        errors.append(f"documented correction is missing: {CORRECTION_RELATIVE_PATH.as_posix()}")
+        return {}
+    correction_fields, correction_rows = read_csv(correction_path)
+    if correction_fields != CORRECTION_FIELDS:
+        errors.append(
+            f"finish_time_correction.csv field contract differs: {correction_fields}"
+        )
+    if len(correction_rows) != EXPECTED_CORRECTION_ROWS:
+        errors.append(
+            f"expected {EXPECTED_CORRECTION_ROWS} correction rows, "
+            f"found {len(correction_rows)}"
+        )
+
+    correction_by_id: dict[str, dict[str, str]] = {}
+    correction_by_position: dict[int, dict[str, str]] = {}
+    correction_positions: list[int] = []
+    old_paths: list[str] = []
+    new_paths: list[str] = []
+    for row_number, correction in enumerate(correction_rows, start=2):
+        label = f"finish_time_correction.csv row {row_number}"
+        record_id = correction.get("record_id", "")
+        if not RECORD_RE.fullmatch(record_id):
+            errors.append(f"{label}: invalid record_id")
+        if record_id in correction_by_id:
+            errors.append(f"{label}: duplicate record_id {record_id}")
+        correction_by_id[record_id] = correction
+        position = parse_int(
+            correction.get("sequence_position", ""),
+            f"{label} sequence_position",
+            errors,
+        )
+        if position is not None:
+            correction_positions.append(position)
+            if position in correction_by_position:
+                errors.append(f"{label}: duplicate sequence_position {position}")
+            correction_by_position[position] = correction
+        old_paths.append(correction.get("old_file_path", ""))
+        new_paths.append(correction.get("new_file_path", ""))
+        if not HASH_RE.fullmatch(correction.get("sha256", "")):
+            errors.append(f"{label}: invalid ordinary SHA-256")
+        if not HASH_RE.fullmatch(correction.get("hub_xet_hash", "")):
+            errors.append(f"{label}: invalid Xet identity")
+        size = parse_int(correction.get("size_bytes", ""), f"{label} size_bytes", errors)
+        if size is not None and size <= 0:
+            errors.append(f"{label}: size_bytes must be positive")
+    if len(old_paths) != len(set(old_paths)) or not all(old_paths):
+        errors.append("finish_time_correction.csv old paths must be nonblank and unique")
+    if len(new_paths) != len(set(new_paths)) or not all(new_paths):
+        errors.append("finish_time_correction.csv new paths must be nonblank and unique")
+    if set(correction_by_position) != set(range(1, EXPECTED_CORRECTION_ROWS + 1)):
+        errors.append("finish_time_correction.csv sequence positions must be exactly 1 through 12")
+    if correction_positions != list(range(1, EXPECTED_CORRECTION_ROWS + 1)):
+        errors.append("finish_time_correction.csv rows must be in sequence order")
+
+    sep02_path = (
+        root
+        / "Standard_Time_Lapses"
+        / "Provenance"
+        / "2026-09-02"
+        / "fragment_sequence_relationships.csv"
+    )
+    _, sep02_rows = read_csv(sep02_path)
+    historical_relationship_rows = [
+        row
+        for row in sep02_rows
+        if row.get("object_role") == "canonical_fragment"
+        and row.get("fragment_set_label") == EXPECTED_CONFLICT_GROUP
+    ]
+    historical_timing_rows = [
+        row
+        for row in timing_rows
+        if row.get("fragment_set_label") == EXPECTED_CONFLICT_GROUP
+    ]
+    if len(historical_relationship_rows) != EXPECTED_CORRECTION_ROWS:
+        errors.append(
+            "Sep-02 historical relationship packet does not contain exactly "
+            "12 affected canonical rows"
+        )
+    if len(historical_timing_rows) != EXPECTED_CORRECTION_ROWS:
+        errors.append(
+            "historical recording_timing.csv does not contain exactly "
+            "12 affected rows"
+        )
+    relationship_by_position = {
+        int(row["sequence_position"]): row
+        for row in historical_relationship_rows
+        if row.get("sequence_position", "").isdigit()
+    }
+    timing_by_position = {
+        int(row["sequence_position"]): row
+        for row in historical_timing_rows
+        if row.get("sequence_position", "").isdigit()
+    }
+
+    metadata_path = root / EXPECTED_CANONICAL_METADATA_RECEIPT["file_path"]
+    metadata_bytes = metadata_path.read_bytes()
+    malformed_metadata = False
+    for row_number, row in enumerate(metadata_rows, start=2):
+        if None in row or any(value is None for value in row.values()):
+            errors.append(f"metadata.csv row {row_number} has malformed field width")
+            malformed_metadata = True
+    if not malformed_metadata:
+        deterministic_bytes = serialize_csv_bytes(metadata_fields, metadata_rows)
+        if metadata_bytes != deterministic_bytes:
+            errors.append(
+                "metadata.csv is not deterministic UTF-8 CSV with LF line endings"
+            )
+    if [row.get("file_name", "") for row in metadata_rows] != sorted(
+        row.get("file_name", "") for row in metadata_rows
+    ):
+        errors.append("metadata.csv rows are not sorted by file_name")
+    if len(metadata_fields) != EXPECTED_CANONICAL_METADATA_RECEIPT["field_count"]:
+        errors.append("metadata.csv current field count differs from the pinned snapshot")
+    if len(metadata_rows) < EXPECTED_CANONICAL_METADATA_RECEIPT["row_count"]:
+        errors.append("metadata.csv current row count is below the pinned source snapshot")
+
+    current_by_id = {row.get("record_id", ""): row for row in metadata_rows}
+    inverse_rows = [dict(row) for row in metadata_rows]
+    inverse_by_id = {row.get("record_id", ""): row for row in inverse_rows}
+    for record_id, correction in correction_by_id.items():
+        inverse = inverse_by_id.get(record_id)
+        if inverse is not None:
+            inverse["file_name"] = correction.get("old_file_path", "")
+            inverse["date"] = correction.get("old_finish_date", "")
+            inverse["time"] = correction.get("old_finish_time", "")
+    inverse_rows.sort(key=lambda row: row.get("file_name", ""))
+    pinned_row_count = int(EXPECTED_CANONICAL_METADATA_RECEIPT["row_count"])
+    reconstructed_rows = inverse_rows[:pinned_row_count]
+    reconstructed_bytes = (
+        serialize_csv_bytes(metadata_fields, reconstructed_rows)
+        if not malformed_metadata
+        else b""
+    )
+    if len(reconstructed_bytes) != EXPECTED_CANONICAL_METADATA_RECEIPT["size_bytes"]:
+        errors.append(
+            "reconstructed pinned metadata snapshot byte size differs from the "
+            "source_manifest receipt"
+        )
+    if (
+        hashlib.sha256(reconstructed_bytes).hexdigest()
+        != EXPECTED_CANONICAL_METADATA_RECEIPT["sha256"]
+    ):
+        errors.append(
+            "reconstructed pinned metadata snapshot differs from the "
+            "source_manifest receipt"
+        )
+    reconstructed_by_id = {
+        row.get("record_id", ""): row for row in reconstructed_rows
+    }
+
+    sha256_entries = read_sha256_manifest(root / "SHA256SUMS", errors)
+    for position in range(1, EXPECTED_CORRECTION_ROWS + 1):
+        correction = correction_by_position.get(position)
+        relationship = relationship_by_position.get(position)
+        timing = timing_by_position.get(position)
+        if correction is None or relationship is None or timing is None:
+            continue
+        label = f"documented correction position {position}"
+        old_path = (
+            f"Standard_Time_Lapses/{EXPECTED_CONFLICT_GROUP}.Rec{position:02d}.mp4"
+        )
+        new_path = (
+            f"Standard_Time_Lapses/{EXPECTED_CORRECTED_GROUP}.Rec{position:02d}.mp4"
+        )
+        expected_literals = {
+            "old_file_path": old_path,
+            "new_file_path": new_path,
+            "old_finish_date": "2026-09-01",
+            "old_finish_time": "02:13",
+            "new_finish_date": "2026-09-01",
+            "new_finish_time": "14:13",
+        }
+        for field, expected in expected_literals.items():
+            if correction.get(field) != expected:
+                errors.append(f"{label}: {field} differs from {expected!r}")
+        if relationship.get("sequence_count") != str(EXPECTED_CORRECTION_ROWS):
+            errors.append(f"{label}: relationship sequence_count differs")
+        if timing.get("sequence_count") != str(EXPECTED_CORRECTION_ROWS):
+            errors.append(f"{label}: timing sequence_count differs")
+        for field in ("record_id", "sha256", "hub_xet_hash", "size_bytes"):
+            relationship_value = relationship.get(field, "")
+            if correction.get(field) != relationship_value:
+                errors.append(f"{label}: {field} differs from Sep-02 relationship")
+        for field in ("record_id", "sha256", "hub_xet_hash"):
+            if correction.get(field) != timing.get(field):
+                errors.append(f"{label}: {field} differs from historical timing row")
+        if timing.get("file_path") != old_path:
+            errors.append(f"{label}: historical timing path differs")
+        if timing.get("documented_group_finish_date") != "2026-09-01":
+            errors.append(f"{label}: historical timing finish date differs")
+        if timing.get("documented_group_finish_time") != "02:13":
+            errors.append(f"{label}: historical timing finish time differs")
+
+        record_id = correction.get("record_id", "")
+        current = current_by_id.get(record_id)
+        if current is None:
+            errors.append(f"{label}: record_id is absent from current metadata.csv")
+        else:
+            current_expectations = {
+                "file_name": new_path,
+                "date": correction.get("new_finish_date", ""),
+                "time": correction.get("new_finish_time", ""),
+                "hub_xet_hash": correction.get("hub_xet_hash", ""),
+                "size_bytes": correction.get("size_bytes", ""),
+                "acquisition_protocol_version": correction.get(
+                    "acquisition_protocol_version", ""
+                ),
+            }
+            for field, expected in current_expectations.items():
+                if current.get(field) != expected:
+                    errors.append(f"{label}: current metadata {field} differs")
+        reconstructed = reconstructed_by_id.get(record_id)
+        if reconstructed is None:
+            errors.append(f"{label}: record_id is absent from reconstructed snapshot")
+        else:
+            reconstructed_expectations = {
+                "file_name": old_path,
+                "date": correction.get("old_finish_date", ""),
+                "time": correction.get("old_finish_time", ""),
+                "hub_xet_hash": correction.get("hub_xet_hash", ""),
+                "size_bytes": correction.get("size_bytes", ""),
+                "acquisition_protocol_version": correction.get(
+                    "acquisition_protocol_version", ""
+                ),
+            }
+            for field, expected in reconstructed_expectations.items():
+                if reconstructed.get(field) != expected:
+                    errors.append(f"{label}: reconstructed metadata {field} differs")
+        if old_path in sha256_entries:
+            errors.append(f"{label}: old path remains in active SHA256SUMS")
+        if sha256_entries.get(new_path) != correction.get("sha256"):
+            errors.append(f"{label}: active SHA256SUMS path/hash differs")
+
+    expected_ids = {
+        row.get("record_id", "") for row in historical_relationship_rows
+    }
+    if set(correction_by_id) != expected_ids:
+        errors.append(
+            "finish_time_correction.csv record IDs differ from the affected "
+            "Sep-02 relationship rows"
+        )
+    return correction_by_id
+
+
 def validate_local_audit_receipts(
     manifest: dict[str, object], errors: list[str]
 ) -> dict[str, int]:
@@ -541,7 +790,10 @@ def main() -> None:
 
     relationship_rows = validate_source_receipts(root, manifest, errors)
     expected_audit_counts = validate_local_audit_receipts(manifest, errors)
-    _, metadata_rows = read_csv(root / "metadata.csv")
+    metadata_fields, metadata_rows = read_csv(root / "metadata.csv")
+    correction_by_id = validate_correction_bridge(
+        root, metadata_fields, metadata_rows, timing_rows, errors
+    )
     for field in ("record_id", "file_name", "hub_xet_hash"):
         values = [row.get(field, "") for row in metadata_rows]
         if not all(values) or len(values) != len(set(values)):
@@ -585,6 +837,7 @@ def main() -> None:
 
         relationship = canonical_relationships.get(record_id)
         metadata = metadata_by_id.get(record_id)
+        correction = correction_by_id.get(record_id)
         if relationship is None:
             errors.append(f"{label}: record_id is absent from canonical relationships")
         else:
@@ -602,20 +855,40 @@ def main() -> None:
         if metadata is None:
             errors.append(f"{label}: record_id is absent from metadata.csv")
         else:
-            if row.get("file_path") != metadata.get("file_name"):
+            expected_current_path = (
+                correction.get("new_file_path", "")
+                if correction is not None
+                else row.get("file_path", "")
+            )
+            if expected_current_path != metadata.get("file_name"):
                 errors.append(f"{label}: file_path differs from metadata.csv")
             if row.get("hub_xet_hash") != metadata.get("hub_xet_hash"):
                 errors.append(f"{label}: hub_xet_hash differs from metadata.csv")
             if relationship is not None:
-                if relationship.get("file_path") != metadata.get("file_name"):
+                expected_relationship_path = (
+                    correction.get("old_file_path", "")
+                    if correction is not None
+                    else metadata.get("file_name", "")
+                )
+                if relationship.get("file_path") != expected_relationship_path:
                     errors.append(f"{label}: relationship path differs from metadata.csv")
                 if relationship.get("hub_xet_hash") != metadata.get("hub_xet_hash"):
                     errors.append(f"{label}: relationship Xet identity differs from metadata.csv")
                 if relationship.get("size_bytes") != metadata.get("size_bytes"):
                     errors.append(f"{label}: relationship byte size differs from metadata.csv")
-            if row.get("documented_group_finish_date") != metadata.get("date"):
+            expected_current_date = (
+                correction.get("new_finish_date", "")
+                if correction is not None
+                else row.get("documented_group_finish_date", "")
+            )
+            expected_current_time = (
+                correction.get("new_finish_time", "")
+                if correction is not None
+                else row.get("documented_group_finish_time", "")
+            )
+            if expected_current_date != metadata.get("date"):
                 errors.append(f"{label}: documented finish date differs from metadata.csv")
-            if row.get("documented_group_finish_time") != metadata.get("time"):
+            if expected_current_time != metadata.get("time"):
                 errors.append(f"{label}: documented finish time differs from metadata.csv")
 
         if row.get("format_creation_time_utc") != row.get("video_creation_time_utc"):
@@ -973,6 +1246,51 @@ def main() -> None:
     if conflict_groups != {EXPECTED_CONFLICT_GROUP: EXPECTED_CONFLICT_DELTA}:
         errors.append(f"unexpected finish conflicts: {conflict_groups}")
 
+    corrected_historical_rows = sorted(
+        (
+            row
+            for row in timing_rows
+            if row.get("record_id") in correction_by_id
+        ),
+        key=lambda row: int(row["sequence_position"]),
+    )
+    active_finish_delta: Decimal | None = None
+    active_finish_status = ""
+    if len(corrected_historical_rows) != EXPECTED_CORRECTION_ROWS:
+        errors.append("documented correction does not bridge exactly 12 timing rows")
+    else:
+        active_final_boundary = parse_timestamp(
+            corrected_historical_rows[-1]["format_creation_time_utc"],
+            "corrected active group final boundary",
+            errors,
+        )
+        active_documented_finish = datetime(
+            2026, 9, 1, 14, 13, tzinfo=LOCAL_ZONE
+        )
+        if active_final_boundary is not None:
+            active_finish_delta = Decimal(
+                str(
+                    (
+                        active_final_boundary.astimezone(timezone.utc)
+                        - active_documented_finish.astimezone(timezone.utc)
+                    ).total_seconds()
+                )
+            )
+            active_finish_status = (
+                "near_documented_finish_minute"
+                if abs(active_finish_delta) <= Decimal(120)
+                else "documented_finish_conflict"
+            )
+            close_decimal(
+                active_finish_delta,
+                EXPECTED_CORRECTED_DELTA,
+                Decimal(0),
+                "corrected active finish delta",
+                errors,
+            )
+            if active_finish_status != "near_documented_finish_minute":
+                errors.append("corrected active finish is not near the documented minute")
+
     group_by_label = {row["fragment_set_label"]: row for row in group_rows}
     if len(group_by_label) != len(group_rows):
         errors.append("group_timing_summary.csv has duplicate fragment_set_label values")
@@ -1381,9 +1699,12 @@ def main() -> None:
             {
                 "status": "ok",
                 "source_revision": EXPECTED_SOURCE_REVISION,
-                "metadata_receipt_mode": "immutable_prefix_with_append_only_rows",
+                "metadata_receipt_mode": (
+                    "inverse_documented_correction_then_exact_pinned_snapshot"
+                ),
                 "pinned_metadata_rows": EXPECTED_CANONICAL_METADATA_RECEIPT["row_count"],
                 "current_metadata_rows": len(metadata_rows),
+                "documented_correction_rows": len(correction_by_id),
                 "timing_rows": len(timing_rows),
                 "direct_filename_timestamp_rows": basis_counts[
                     "direct_device_filename_start"
@@ -1392,9 +1713,15 @@ def main() -> None:
                 "groups": len(groups),
                 "transitions": transition_count,
                 "gap_status_counts": dict(gap_counts),
-                "finish_conflicts": {
+                "historical_finish_conflicts": {
                     key: float(value) for key, value in conflict_groups.items()
                 },
+                "active_corrected_finish_crosscheck": {
+                    "fragment_set_label": EXPECTED_CORRECTED_GROUP,
+                    "delta_seconds": float(active_finish_delta),
+                    "status": active_finish_status,
+                },
+                "active_sha256sum_paths_verified": len(correction_by_id),
                 "bundle_files_verified": len(
                     [
                         path