Merge pull request 'update to v0.21.1, thor data import successful' (#29 ) from dev into main

Reviewed-on: #29
fix(backfill): regenerate IDFH .h5 + merge binary mic_pspl_psi onto bridge
2026-06-01 16:54:23 -04:00 · 2026-06-01 20:02:54 +00:00 · 2026-06-01 19:33:44 +00:00 · 2026-06-01 18:27:24 +00:00 · 2026-05-31 20:51:09 +00:00 · 2026-05-30 04:37:43 +00:00
42 changed files with 3341 additions and 208 deletions
@@ -6,8 +6,138 @@ All notable changes to seismo-relay are documented here.

 ## [Unreleased]

+---
+
+## v0.21.1 — 2026-06-01
+
+Bug fixes against v0.21.0 surfaced after the first prod redeploy.  Three
+production-visible symptoms — blank waveform charts on most Thor events,
+blank histogram charts on all Thor events, and a mic chart that
+auto-scaled against a dB(L) value treated as psi — all root-caused and
+fixed.
+
 ### Fixed

+- **Dynamic IDFW body offset.**  The v0.21.0 codec hardcoded the body
+  at file offset `0x0f1f` based on the example corpus, but only ~52%
+  of production IDFW events use that offset; the rest sit at offsets
+  from `0x1033` up to `0x3082` depending on header padding.  At
+  `0x0f1f` the codec would find a coincidentally-matching `00 02 00`
+  magic, read the 2-byte Tran preamble, and return empty V/L/M
+  arrays — producing near-empty .h5 files and blank charts.
+  `micromate.idf_file._find_waveform_body_offset()` now scans every
+  `00 02 00` magic position past `0x0E00`, trial-decodes each one,
+  and picks the offset with the most samples.  Validated across 483
+  prod IDFW files: 0 preamble-only events (was ~50%), 355/483 fully
+  decode, 126/483 partial (BW codec walker-stops-early on loud
+  events — pre-existing limitation, samples reached are correct).
+
+- **IDFH histograms now render bar charts.**  Histograms previously
+  skipped the .h5 write because there are no per-sample arrays, but
+  the renderer drives the per-interval bar chart from .h5 channel
+  data + `bw_report.histogram.n_intervals`.  `save_imported_idf` now
+  synthesizes a 1-sample-per-interval array from the decoded
+  `IdfhInterval` peak counts and writes an .h5 so the existing
+  renderer works unchanged — each "sample" is the per-interval peak
+  ADC count, so the writer's `count × geo_fs/32768` conversion
+  yields the right bar height.
+
+- **Mic chart scaling on Thor events.**  `PeakValues.micl` (consumed
+  by the h5 writer's per-count mic scale factor) expects psi, but
+  the Thor bridge was stuffing the dB(L) value (~99.4) into it,
+  producing a per-count factor 5+ orders of magnitude too large and
+  a flat-looking mic chart.  Fixed by adding `IdfPeaks.mic_pspl_psi`
+  alongside `mic_pspl_dbl`; `read_idf_file()` computes it from
+  binary mic counts (`max(|MicL|) × 2.14e-6 psi/count`) for both
+  IDFW and IDFH paths; `save_imported_idf` merges it onto the typed
+  event after `IdfEvent.from_report`; the bridge feeds psi to
+  `PeakValues.micl` with a dB(L)→psi formula fallback when only the
+  dB(L) value is available.  dB(L) for the report header still
+  flows through `bw_report.mic.pspl_dbl` unchanged.
+
+### Operator
+
+After deploy, run `python scripts/backfill_thor_events.py` to refresh
+every existing Thor event's sidecar + .h5 with the corrected codec
+output.  The script auto-skips events already at the current
+`TOOL_VERSION`, so the bump from `0.21.0` → `0.21.1` is what triggers
+the refresh.
+
+---
+
+## v0.21.0 — 2026-05-29
+
+The "Thor / Series IV codec" release.  Two big pieces landed: (1) the IDF binary codec actually decodes now, both IDFW and IDFH, and (2) a Thor→BW adapter lets Thor events flow through the existing Series III Event Report PDF pipeline.  Combined effect: a Thor event ingested via `/db/import/idf_file` now lands in the DB with the same fidelity as a Blastware event, gets a per-event PDF on demand, and renders in Terra-View's modal chart with the same plotting code as a BW event.
+
+### Added — Thor IDF binary codec (`micromate/idf_file.read_idf_file`)
+
+- **IDFW (waveform)** — body sits at fixed file offset `0x0f1f`; reuses the verified `decode_waveform_v2()` walker from `minimateplus.waveform_codec`.  Sample fidelity is **87–99% byte-exact** against the ASCII-sidecar reference values on quiet events; loud events hit the same walker-stops-early limitation as the BW codec on `SP0/SS0/SV0`-style events.
+- **IDFH (histogram)** — dedicated segment-based decoder for the Thor histogram body format: `[len_be][0a 00 00 00][00 NN][05 3f]` framing plus N × 72-byte interval records (4 × 16-byte per-channel min/max/halfp).  **All 859 Thor IDFH corpus files decode**, totalling **181,071 intervals**; per-channel peaks match the sidecar within **~1.8% (ADC quantization)**.
+- **BW-aliased binary detection** — a small number of corpus files (e.g. `BE9439_*.IDFW/IDFH`) are actually Series III Blastware binaries that share the IDF filename convention by accident.  `read_idf_file()` detects them via their BW `STRT` signature and raises `NotImplementedError` pointing the caller at `read_blastware_file()` instead of trying to decode them as IDF.
+- Full field layouts in `docs/idf_protocol_reference.md`; supporting analysis scripts in `analysis_idf/` (decode validators, per-file detail dumps, corpus accuracy reports).
+
+### Added — Thor → BW report adapter (`micromate/idf_to_bw_report.py`)
+
+- **`build_bw_report_from_idf(report_dict, binary_md=, intervals=, is_histogram=)`** projects a parsed Thor `IdfReport` plus binary-extracted metadata plus decoded IDFH intervals into the `bw_report`-shaped dict that `sfm.report_pdf.gather_report_data` consumes.  No need to duplicate the renderer — Thor data is ~95% the same metric set as BW; the adapter handles the field-name mapping (`MicPSPL` → `pspl_dbl`, `>100` sentinel → `zc_freq_above_range`, free-form `Calibration : Nov 22, 2023 by Instantel` → `calibration_date` + `calibration_by`, etc.).
+- For IDFH events the adapter derives `histogram.interval_times` by stepping `IntervalSize` from `HistogramStartTime`, matching what the BW pipeline expects from a histogram-mode event.
+- **Wired into `WaveformStore.save_imported_idf`** — every Thor event ingested via `/db/import/idf_file` now gets a `bw_report` block in its sidecar in addition to the existing `extensions.idf_report` (the raw parsed Thor payload).  Falls back gracefully (PDF renders from DB-only fields) if the adapter raises — logged as a warning rather than failing the ingest.
+
+### Companion releases
+
+- **Terra-View v0.13.0** ships in parallel — closes Phase 1 of the SFM integration.  The shared event-detail modal now renders the SFM event story (Chart.js waveform/histogram chart, inline PDF preview, `.TXT` download, FT/reviewer/notes review form) without operators needing to bounce to the standalone SFM webapp on port 8200.  Uses only existing seismo-relay endpoints — no API changes here, just better consumption.
+
+### Migration / Operations
+
+No DB migration needed.  Existing Thor events already in the store don't automatically pick up the new `bw_report` block — they'd need a re-ingest (post the IDF binary + paired `.TXT` back to `/db/import/idf_file`) for the adapter to run.  Alternatively, run `scripts/backfill_sidecars.py --reparse-txt` after a small adapter change (the script currently only re-runs the BW ASCII parser; extending it to handle Thor would be a small follow-up).
+
+```bash
+cd /home/serversdown/terra-view
+docker compose build sfm && docker compose up -d sfm
+```
+
+The bumped `TOOL_VERSION = "0.21.0"` in `minimateplus/event_file_io.py` means any subsequent `backfill_sidecars.py --force` pass will re-write sidecars with the new version stamp; that's expected and harmless.
+
+---
+
+## v0.20.0 — 2026-05-28
+
+The "PDF + parser polish" release.  Closes out the Event-Report PDF iteration started in v0.17.x: histogram layouts now render correctly against BW reference PDFs, the ASCII parser handles the real-world edge cases production events were tripping over (OORANGE, `>100 Hz`, histogram timestamps), and the `.TXT` preservation rollout lets parser fixes be applied retroactively to ingested events.  Adds server-wide timezone support so operator-visible timestamps no longer drift into UTC.  Rolls up the substantial "pre-v0.20" body of work that had accumulated under `[Unreleased]` (PDF generation, histogram codec fix, histogram parser fields, `.TXT` preservation, backfill safety) — see the trailing "pre-v0.20.0 work" section below for the full list.
+
+### Added (2026-05-28)
+
+- **Server-wide display timezone via `TZ` env var.**  Both seismo-relay and terra-view now respect a `TZ` environment variable (default `America/New_York` on prod).  Affects server log timestamps, the PDF report renderer's UTC→local conversions on the "Created" footer line, matplotlib's datetime axes, and any other naïve-vs-aware datetime rendering.  DB columns (`created_at`, etc.) stay UTC regardless — this is a display-side fix, not a storage-side one.  Dockerfile now installs `tzdata` (required for the env var to take effect under `python:slim`).  Override per-deployment via the `TZ` line in `docker-compose.yml`.
+- **ZC Freq "above-range" handling — render `>100 Hz` instead of `—`.**  BW writes `">100 Hz"` literally when the zero-crossing algorithm sees a peak too fast to count (device cuts off at 100 Hz on V10.72).  Previously `_parse_number(">100")` returned None and the PDF stats table rendered `—`.  Now the parser mirrors the OORANGE pattern: stores 100.0 on `zc_freq_hz` and sets a new `zc_freq_above_range` flag.  Flag rides through the sidecar's `bw_report` block.  Renders as `>100` in the PDF (per-channel + mic block), as `· >100 Hz` inline on the event modal's Peaks section, and as a dedicated column on the event-browser stats table.  Verified against the real T190LD5Q.LK0W fixture from 2026-05-27 plus a synthetic test case.
+- **Per-channel ZC Freq surfaced in event modals.**  Neither the main webapp modal (`sfm_webapp.html`) nor the standalone event browser (`event_browser.html`) previously exposed ZC Freq.  Now both do — webapp shows it inline alongside PPV (`0.04500 in/s · 47 Hz`); event-browser gets a dedicated column on its per-channel stats table.  Required wiring a parallel sidecar fetch into the event-browser's `loadEvent()` (it was only fetching `waveform.json`).  Falls back to `—` for events without a preserved `.TXT` (pre-2026-05-27 ingests).
+- **`scripts/backfill_sidecars.py --reparse-txt` flag.**  Before this, the backfill script preserved the `bw_report` block from existing sidecars verbatim — so parser-side fixes (like the `>100 Hz` addition above) couldn't reach old events.  The new flag re-runs the current parser against the preserved `<serial>/<filename>_ASCII.TXT`, overwrites the bw_report block, and cascade-regenerates the sidecar.  Implies sidecar regeneration on every event (bypasses the sha/version skip).  No-op for events without a preserved .TXT (legacy ingests pre-2026-05-27 .TXT-preservation rollout).  Idempotent.  Run with `--skip-hdf5` to skip waveform regen — recommended when only the bw_report needs refreshing.  Validated end-to-end on prod: 9,999 events refreshed cleanly, ZC Freq + OORANGE flags now populated where the original .TXT had them.
+
+### Fixed (2026-05-28)
+
+- **Histogram PDFs no longer 500 on the missing `histogram_interval_size_s` attribute.**  The histogram-interval-times derivation block in `gather_report_data` referenced `rd.histogram_interval_size_s`, but the field was never declared on the `ReportData` dataclass nor read from the sidecar projection (it was inlined into `gather_report_data` without the seconds-numeric counterpart making it onto the dataclass).  Every histogram PDF render raised `AttributeError → 500`.  Waveform PDFs were unaffected.  Fix: add the field, read it from the projection's existing `bw_report.histogram.interval_size_s` key.
+- **Histogram PDF geo channels now share a single nice-quantized y-axis.**  Previously each geo subplot auto-scaled independently — Tran, Vert, and Long all showed different per-channel maxes, so bar heights weren't directly comparable across channels.  The footer "Amplitude Geo: X in/s/div" label was also computed as `max(first_geo_channel) / 5` with no LSB quantization, producing nonsense values like `0.003 in/s/div` when the geophone LSB is 0.005.  Fix: compute a single shared geo y-axis range from `max(Tran, Vert, Long)`, quantize the per-division step to BW's 1-2-5 sequence rounded to the 0.005 in/s LSB (0.005, 0.01, 0.025, 0.05, 0.1, 0.25, ...), apply the same `ylim` + ticks to all three subplots, and use that step for the footer label.  MicL stays on its own auto-scale (different units).  Matches BW's chart styling.
+
+### Docs (2026-05-28)
+
+- **Roadmap entry for a second undecoded histogram body sub-format.**  BE17353 (S353) events observed on 2026-05-28 use a histogram body where `byte[5] = 0x00` (looks like a valid block header by every prior signal) but the walker finds zero data blocks.  Different from the existing `byte[5] != 0` roadmap entry (T190 / O121).  Operationally identical impact — ingestion succeeds, DB peaks come from the bw_report overlay, only the chart is empty.  Sample events captured in the roadmap entry for future RE work.
+
+### Migration / Operations
+
+- **Re-parse existing events to pick up the new parser fields.**  Run on whichever box hosts the live waveform store:
+  ```bash
+  docker exec terra-view-sfm-1 python /app/scripts/backfill_sidecars.py \
+      --reparse-txt --skip-hdf5 --dry-run -v | tail
+  # Looks reasonable?  Run for real:
+  docker exec terra-view-sfm-1 python /app/scripts/backfill_sidecars.py \
+      --reparse-txt --skip-hdf5 -v | tee /tmp/reparse.log | tail -30
+  ```
+  Idempotent; safe to re-run.  Only touches sidecars on disk — no DB writes.
+- **terra-view docker-compose.yml**: add `TZ=America/New_York` (or your deployment's zone) to both the `terra-view` and `sfm` service `environment:` blocks.  Without this, server-rendered timestamps stay in UTC even on the rebuilt SFM image.
+
+### Pre-v0.20.0 work (rolled into this release)
+
+The bullets below accumulated under `[Unreleased]` between v0.19.0 and v0.20.0; kept here so the historical narrative isn't lost.
+
+#### Fixed
+
 - **bw_ascii_report parser now handles `OORANGE` saturation marker.**  BW writes `"OORANGE"` (truncation of "Out Of Range") in PPV / PVS / MicL PSPL fields when the underlying measurement exceeded the channel's full-scale.  Previously our `_parse_number()` returned None → DB ended up with NULL peaks for legitimate high-amplitude events.  Confirmed on real ASCII files pulled 2026-05-27 from the Windows watcher PC: T190LD5Q.LK0W (Vert saturated at Normal range 10 in/s), T438L713.RY0W (all three channels saturated at Sensitive range 1.25 in/s), K557L3YM.OE0W (Tran+Vert saturated + Mic PSPL OORANGE).  New behavior:
   - Per-channel PPV: substitute `geo_range_ips` as a conservative lower bound + set `ppv_saturated` flag
   - Peak Vector Sum: substitute `sqrt(3) * geo_range_ips` (the theoretical max when all 3 channels are simultaneously at full-scale) + `peak_vector_sum_saturated` flag
@@ -16,7 +146,7 @@ All notable changes to seismo-relay are documented here.
   - Five events on prod (T190 / T438 / K557 + 2 others matching the same fault pattern) will pick up correct DB peaks + saturation flags once re-forwarded
 - **bw_ascii_report parser handles `Peak Vector Sum TimeSum` typo'd label.**  Real BW output uses this misspelled label (Sum appended twice instead of "Peak Vector Sum Time").  Now accepted as an alias.  Confirmed against all three OORANGE example files — every one has the typo.

-### Added
+#### Added

 - **Histogram per-interval aggregation in `waveform.json`.**  Histogram events now render with one bar per BW-reported interval (matching the Blastware printout) instead of ~200 bars per event (the raw codec output).  When the sidecar's `bw_report.histogram.n_intervals` is populated (events ingested with the new parser, see next bullet), the `/db/events/{id}/waveform.json` endpoint groups the codec samples into N intervals via max-per-group and returns the aggregated array.  `time_axis` gains `histogram_aggregated: true`, `n_intervals`, `interval_size_s`, and `interval_times` (HH:MM:SS strings).  Both the modal chart and the standalone event browser use those interval timestamps as x-axis labels when present.  Defensive: no-op for events ingested before the parser extension landed (their sidecars lack `histogram.n_intervals`) — those continue to render with raw codec output.
 - **`bw_ascii_report` parser now captures histogram-specific fields.**  Previously the parser dropped these fields silently (Roadmap item closed):
@@ -43,13 +173,13 @@ All notable changes to seismo-relay are documented here.
 - **`apply_bw_report_dict_to_event` helper** in `minimateplus.event_file_io`.  Mirror of `apply_report_to_event` for the projected sidecar dict shape — used by the backfill path, which has the preserved `bw_report` block but not the original `.TXT` file.  BW's reported peaks (and `sample_rate` / `record_time`) now win over codec output during `--force` backfill, matching ingest-path behavior.
 - **`scripts/check_bw_report_preservation.py`** — two-step snapshot/diff tool to verify that `backfill_sidecars.py` doesn't wipe the `bw_report` block from existing sidecars.  Classifies every sidecar as PRESERVED / CHANGED / WIPED / STILL_MISSING / NEW / ADDED / REMOVED.  Exit code 1 if any WIPED or CHANGED entries are found, so it can gate a CI step or deploy script.

-### Fixed
+#### Fixed

 - **`scripts/backfill_sidecars.py` no longer wipes `bw_report`.**  Before this fix, `event_to_sidecar_dict` silently dropped the preserved `bw_report` block during every backfill, since the function only emits a `bw_report` when called with a live `BwAsciiReport` dataclass (which the backfill doesn't have — only the projected sidecar dict).  Now we read the existing sidecar's `bw_report` and overlay it onto the regenerated sidecar, alongside the existing `review` and `extensions` preservation.
 - **`scripts/backfill_sidecars.py --force` no longer overwrites BW-overlaid DB peaks with codec output.**  The backfill path now calls `apply_bw_report_dict_to_event` before the DB upsert, mirroring what the ingest path does (`/db/import/blastware_file` parses the `.TXT` into a `BwAsciiReport`, calls `apply_report_to_event`, then upserts).  Without this, events where the codec doesn't fully decode (waveform walker edge cases on SP0/SS0/SV0-style events, histogram `byte[5]!=0` sub-format) ended up with PVS=0 in the DB after a `--force` backfill; bit on prod 2026-05-22, rolled back the same day.
 - **Thor IDF files no longer attempted as BW events in backfill.**  `scripts/backfill_sidecars.py` now filters out `.IDFW` / `.IDFH` files in `_looks_like_event_file()`; they share the `.X0W` / `.X0H` suffix shape but use a separate ingest path (`WaveformStore.save_imported_idf`) and aren't decodable by `event_file_io.read_blastware_file`.

-### Docs
+#### Docs

 - **CLAUDE.md** — added a three-tier conceptual architecture model (SFM / SDM / shared codec library) near the top of the file, with a placement rule for where new code goes.  Documents that what is conceptually SDM (database, waveform store, ingest, `/db/*` endpoints) still lives under `sfm/` for historical reasons; rename deferred until the codebase is quiet enough for a clean refactor.
 - **README.md** — added a "Strategic direction" lead-in to the Roadmap that frames seismo-relay as a suite of cooperating components (not a single app), and an explicit "Terra-View ↔ SFM device control" roadmap section with a concrete implementation checklist (auth as hard prerequisite, embedded live-monitor view, action history, Series IV live-device support).
@@ -2,7 +2,7 @@

 Ground-up Python replacement for **Blastware**, Instantel's Windows-only software for
 managing MiniMate Plus seismographs. Connects over direct RS-232 or cellular modem
-(Sierra Wireless RV50 / RV55). Current version: **v0.17.0**.
+(Sierra Wireless RV50 / RV55). Current version: **v0.21.0**.

 When new information about the protocol is discovered, please update the instantel_protocol_reference.md with the findings in addition to this document

@@ -73,6 +73,28 @@ should not import from `sfm/`, must not touch a DB, and have no I/O
 beyond reading files passed as arguments.  Keep them pure — both
 tiers can then depend on them without circularity.

+#### Thor IDF binary codec (2026-05-28)
+
+`micromate/idf_file.read_idf_file()` decodes both Thor IDFW
+(waveform) and IDFH (histogram) binaries.
+
+- **IDFW** reuses `decode_waveform_v2()` on the body at fixed file
+  offset `0x0f1f`.  Sample fidelity is 87–99% byte-exact on quiet
+  events; loud events hit the BW codec's known walker-stops-early
+  limitation.
+- **IDFH** has its own segment-based decoder: `[len_be][0a 00 00 00]
+  [00 NN][05 3f]` + N × 72-byte interval records (4 × 16-byte
+  per-channel min/max/halfp).  All 859 Thor IDFH corpus files
+  decode (181,071 intervals); peak matches sidecar within ~1.8%
+  (ADC quantization).
+
+The two outlier `BE9439_*` files in the Thor example corpus are
+actually Series III Blastware binaries that share the `.IDFW`/`.IDFH`
+filename convention by accident.  `read_idf_file()` detects them by
+their BW STRT signature and raises NotImplementedError pointing
+callers at `read_blastware_file()`.  See
+`docs/idf_protocol_reference.md` for full field layouts.
+
 ### Practical consequences

 When deciding where new code goes, ask:
@@ -2,10 +2,21 @@ FROM python:3.11-slim

 WORKDIR /app

+# tzdata is required for the TZ env var to take effect (python:slim
+# omits the timezone database).  Without it, datetime.now() / logging
+# / matplotlib all stay in UTC regardless of TZ.  Default zone gets
+# set further down via ENV; users override per-deployment via the
+# `TZ` env var in docker-compose.
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends curl && \
+    apt-get install -y --no-install-recommends curl tzdata && \
    rm -rf /var/lib/apt/lists/*

+# Default display timezone — applied to server logs, datetime.now(),
+# matplotlib rendered timestamps, and any naïve-vs-aware datetime
+# conversions in the PDF renderer.  Override via TZ env var in
+# docker-compose; storage in the DB is always UTC regardless.
+ENV TZ=America/New_York
+
 COPY pyproject.toml requirements.txt ./
 COPY minimateplus ./minimateplus
 COPY micromate    ./micromate
@@ -1,4 +1,4 @@
-# seismo-relay  `v0.19.0`
+# seismo-relay  `v0.21.0`

 A ground-up replacement for **Blastware** — Instantel's aging Windows-only
 software for managing seismographs.  Supports both the **MiniMate Plus
@@ -35,6 +35,25 @@ over direct RS-232 or cellular modem (Sierra Wireless RV50 / RV55).
 > and storage layer dispatch deterministically instead of sniffing
 > filenames.  Self-applying migration backfills existing rows from the
 > binary filename extension.
+> **v0.20.0 (2026-05-28)** closes out the Event-Report PDF iteration
+> started in v0.17.x: histogram layouts render correctly against BW
+> reference PDFs, the ASCII parser handles real-world edge cases
+> (`OORANGE`, `>100 Hz`, histogram timestamps), and per-channel ZC
+> Freq is surfaced in both modals (event browser + main webapp).
+> Adds a server-wide `TZ` env var so operator-visible timestamps
+> render in local time instead of UTC.  New
+> `scripts/backfill_sidecars.py --reparse-txt` lets parser fixes be
+> applied retroactively to existing events without re-forwarding,
+> using the `.TXT` files preserved at ingest time.
+> **v0.21.0 (2026-05-29)** is the Thor / Series IV decoder release —
+> `micromate/idf_file.read_idf_file()` now decodes both IDFW
+> (waveform) and IDFH (histogram) binaries (87–99% sample fidelity
+> on quiet IDFW events; all 859 IDFH corpus files decode cleanly).
+> A new `micromate/idf_to_bw_report.py` adapter projects parsed
+> Thor reports into the BW-shaped sidecar block, so Thor events
+> flow through the existing Event Report PDF pipeline without a
+> separate renderer.  Terra-View v0.13.0 ships in parallel and
+> closes Phase 1 of the SFM integration — see its CHANGELOG.
 > See [CHANGELOG.md](CHANGELOG.md) for full version history.

 ---
@@ -58,7 +77,8 @@ seismo-relay/
 ├── micromate/                 ← Series IV (Micromate / Thor) client library (NEW v0.19)
 │   ├── models.py              ←   IdfEvent, IdfReport, IdfPeaks, IdfProjectInfo, IdfSensorCheck (mic in native dB(L))
 │   ├── idf_ascii_report.py    ←   Parse Thor .IDFW.txt / .IDFH.txt event sidecars
-│   └── idf_file.py            ←   Stub for the .IDFW / .IDFH binary codec (reverse-engineering pending)
+│   ├── idf_file.py            ←   Binary codec for .IDFW + .IDFH (v0.21.0+)
+│   └── idf_to_bw_report.py    ←   Adapter projecting Thor IDF into the BW report shape (v0.21.0+)
 │
 ├── sfm/                       ← SFM REST API server (FastAPI, port 8200)
 │   ├── server.py              ←   Live device endpoints + DB query + ingest endpoints + caching
@@ -415,7 +435,7 @@ Use **com0com** or **VSPD** to create the virtual COM pair on Windows.
 - [x] Thor IDF file ingest at `/db/import/idf_file` (paired with `thor-watcher`, v0.18.0+)
 - [x] Native `IdfEvent` / `IdfReport` typed models — mic in dB(L), full title strings, sensor self-check, calibration, firmware version
 - [x] Parser verified against 1,014 paired `.txt` sidecars in `thor-watcher/example-data/`
- [ ] Binary `.IDFW` / `.IDFH` codec — pending (see Roadmap + [`docs/idf_protocol_reference.md`](docs/idf_protocol_reference.md))
+- [x] Binary `.IDFW` / `.IDFH` codec — ✅ v0.21.0.  IDFW reuses `decode_waveform_v2()` on the body at offset `0x0f1f` (87–99% sample fidelity on quiet events); IDFH has a dedicated segment-based decoder (all 859 corpus files decode, 181,071 intervals total).  See `micromate/idf_file.py` + `docs/idf_protocol_reference.md`.
 - [ ] Live-device protocol — pending codec

 **Data persistence:**
@@ -528,7 +548,7 @@ Implementation steps (concrete):
 ### High-impact (unblocks product features)

 - [ ] **Series III waveform body codec reverse-engineering.**  The 5A bulk-stream body is some kind of compressed/encoded format (not raw int16 LE as previously assumed — see §7.6.1 retraction in `docs/instantel_protocol_reference.md`).  Structural framing is ~50% decoded on branch `claude/codec-re-cBGNe` (tagged-block walker, segment counters); per-byte sample mapping is still open.  Until this lands, the in-app waveform viewer renders garbage and BW-import peak values fall back to `_peaks_from_samples()` saturation noise.  Workaround: pair every BW-imported event with its `_ASCII.TXT` so the device-authoritative peaks land in the DB regardless of codec.
- [ ] **Series IV (Thor IDF) binary codec reverse-engineering.**  `.IDFH` / `.IDFW` files are currently stored opaquely by `WaveformStore.save_imported_idf`, with all metadata sourced from the paired `.txt` sidecar.  This works because thor-watcher forwards both files together, but operators who haven't enabled Thor's TXT exporter get rows with NULL peaks.  Cracking the binary closes that gap and unlocks waveform display.  Starting-point reference at [`docs/idf_protocol_reference.md`](docs/idf_protocol_reference.md) — two observed file signatures (1,012 newer-firmware files + 2 old files whose layout matches the Series III STRT-record format), suggested first-session plan (~2-4 hrs), 1,014 paired binary+txt files available as ground truth in `thor-watcher/example-data/`.  Code seam ready at `micromate/idf_file.py`.
+- [x] **Series IV (Thor IDF) binary codec reverse-engineering.** ✅ v0.21.0 — `micromate/idf_file.read_idf_file()` decodes both IDFW (waveform body at offset `0x0f1f`, reusing `decode_waveform_v2()`; 87–99% sample fidelity on quiet events) and IDFH (dedicated segment-based decoder: all 859 corpus files decode, 181,071 intervals, peaks within ~1.8% of sidecar values).  `WaveformStore.save_imported_idf` now also projects parsed Thor data into a `bw_report` block via `micromate/idf_to_bw_report.py` so Thor events render in the existing Event Report PDF pipeline without a separate renderer.
 - [ ] **In-app waveform viewer accuracy.**  Depends on Series III codec decode.  Plot.v1 JSON pipeline + viewer skeleton already exist; will start showing real waveforms automatically once `_decode_a5_waveform` produces correct samples.  Series IV waveforms come online when the IDF codec lands.
 - [ ] **Series IV live-device support.**  Once the IDF binary is decoded, extend `micromate/` with `transport.py` / `framing.py` / `protocol.py` / `client.py` mirroring the `minimateplus/` package layout — depends on capturing Thor's wire protocol (TCP / RS-232 captures TBD).
 - [ ] **Terra-view integration** — seismo-relay router, unit detail page, VISON-style event listing.
@@ -536,10 +556,10 @@ Implementation steps (concrete):

 ### BW ASCII report parser enhancements (built in v0.16.0)

- [ ] **PPV field misses on certain TXT formats.**  Discovered 2026-05-22 during the histogram-codec backfill validation: a handful of events (5 in prod) have a `bw_report` block where `peaks.{tran,vert,long}.ppv_ips` and `peaks.vector_sum.ips` are all `None`, despite the parser correctly extracting every OTHER field for the same channels (zc_freq_hz, time_of_peak_s, peak_accel_g, peak_disp_in).  Symptom on the DB side: `peak_vector_sum=0` after a `--force` backfill that overlays from the parsed bw_report dict.  Affected events on prod include `T190LD5Q.LK0W`, `T438L713.RY0W`, `K557L3YM.OE0W`.  Root cause likely a regex or format mismatch for the "PPV" header line in those specific firmware/event-type outputs.  Once fixed, re-forwarding the events from series3-watcher will re-populate the `bw_report` blocks correctly.
- [ ] **Histogram-specific structural fields.**  Current parser handles the shared fields (PPV, ZC Freq, sensor self-check, project) but silently drops histogram-only fields: `Histogram Start/Stop Time`, `Histogram Start/Stop Date`, `Number of Intervals`, `Interval Size`, per-channel `Peak Time` + `Peak Date` (absolute timestamps rather than the waveform's `Time of Peak` relative seconds).
+- [x] **PPV field misses on certain TXT formats.** ✅ v0.20.0 — root cause was the `OORANGE` (Out Of Range) saturation marker that BW writes when a channel exceeds its full-scale; `_parse_number()` returned None for the non-numeric value.  Parser now substitutes `geo_range_ips` as a lower bound + sets `ppv_saturated` flag.  All 5 prod events (T190LD5Q.LK0W, T438L713.RY0W, K557L3YM.OE0W, + 2 others) now parse cleanly.
+- [x] **Histogram-specific structural fields.** ✅ v0.20.0 — `Histogram Start/Stop Time+Date`, `Number of Intervals`, `Interval Size`, per-channel `Peak Time` + `Peak Date`, and `Peak Vector Sum Date` all parse now.  Land in the sidecar's `bw_report.histogram` block.
 - [ ] **Histogram interval bin-table parsing.**  Trailing 792-row table (per-interval Peak/Freq per channel + MicL) in histogram TXTs is unparsed.  Probably too big for the sidecar JSON; may want a separate `.histogram.h5` companion file.
- [ ] **`>100 Hz` value parsing.**  Histogram TXTs use `>100 Hz` for out-of-range ZC freq; current `_parse_number()` returns `None` for these (loses information).
+- [x] **`>100 Hz` value parsing.** ✅ v0.20.0 — parser now mirrors the OORANGE pattern: stores 100.0 on `zc_freq_hz` + sets `zc_freq_above_range` flag.  PDF + both modals render `>100 Hz` instead of `—`.

 ### Ingestion gaps

@@ -567,3 +587,5 @@ Implementation steps (concrete):
 - [ ] RV55 DCD/DTR — newer RV55 firmware doesn't assert DCD by default; units don't resume monitoring after call-home disconnect (`--restart-monitoring` flag deferred).
 - [ ] **NULL-timestamp duplicate-row dedup.**  A small handful of events (2 known on prod as of 2026-05-22) have `events.timestamp IS NULL` because the codec couldn't extract a timestamp from the binary footer.  The `UNIQUE(serial, timestamp)` constraint doesn't fire on `NULL` (SQL semantics: `NULL ≠ NULL`), so every `--force` backfill INSERTs a new row instead of UPSERTing the existing one.  Cleanup: a one-shot SQL query that keeps only the newest row per `(serial, blastware_filename)` and deletes the rest.  Longer-term: extend the unique key to `(serial, COALESCE(timestamp, blastware_filename))` or reject inserts with NULL timestamp.
 - [ ] **Histogram body sub-format with `byte[5] != 0`.**  ~3 events on prod (`T190LD5Q.LD0H`, `O121L4L1.GU0H`) use a histogram body my walker doesn't recognize — the first block has `byte[5] = 0x01` or `0x07` instead of `0x00`, and the entire body lacks the `1e 0a 00 00` tail signature.  Codec returns 0 valid blocks; their DB PVS comes from the bw_report ASCII overlay (which BW computed from the same binary, so the DB columns are correct).  Only the `.h5` waveform plot is empty.  Cracking the sub-format would unlock the plot.  Needs binary+ASCII pairs from a few `byte[5]!=0` events; same RE approach as the K558 case.
+- [ ] **Histogram body sub-format with `byte[5] == 0x00` but undecodable.**  Observed 2026-05-28 on BE17353 (S353) events: `S353L4H2.FZ0H`, `S353L4H2.P00H`, `S353L4H3.7O0H`, `S353L4H3.E10H`.  Body starts `00 00 00 01 0a 00 XX 00 ...` which LOOKS like a valid histogram block header (marker 0x000a at byte[4:6] ✓, byte[5]=0x00 normal-format ✓), but the walker finds zero data blocks across the whole body.  Likely an extra header before the block stream OR a different tail signature than `1e 0a 00 00`.  Smaller body lengths (1900-2100 bytes) suggest these may be short-recording histogram variants.  Same operational impact as the byte[5]!=0 case: event ingests cleanly, DB peaks correct via bw_report overlay, only the chart is empty.  Worth dumping a hex view of one body to diagnose.
+- [ ] **Sensor-check waveform extraction from the BW binary.**  BW's Event Report PDFs include a narrow panel on the right side of the waveform plot showing each channel's response to the sensor self-check signal (a damped sinusoid for geo, sawtooth-at-test-freq for mic).  Our parser captures the test RESULTS (`test_freq_hz`, `test_ratio`, `test_amplitude_mv`, `test_results` pass/fail) and the PDF + modal display them as text — but BW's per-sample sensor-check waveform isn't accessible to us today.  Two paths to add it:  (a) RE the binary to find where the sensor-check samples are stored — could be a section before STRT, after the footer, or in a separate sub-record; protocol reference doesn't currently mention it.  (b) If samples aren't in the binary, synthesize a representative waveform from the test parameters (damped sinusoid at `test_freq_hz` with damping from `test_ratio`).  Path (a) is the honest answer; path (b) is decorative.  Until either lands, the text-only sensor-check display in the report is fine.
@@ -0,0 +1,65 @@
+"""Run read_idf_file across the corpus and report per-channel accuracy vs sidecars."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from micromate.idf_file import read_idf_file
+from analysis_idf.recon import load_sidecar_samples
+
+
+def sidecar_path(idfw: Path) -> Path:
+    return idfw.parent / "TXT" / f"{idfw.name}.txt"
+
+
+def main():
+    root = REPO / "tests/fixtures/THORDATA_example"
+    files = [f for f in root.rglob("*.IDFW") if not str(f).endswith(".CDB")]
+    files.sort()
+    GEO_LSB = 0.0003
+
+    n_ok = n_skip = 0
+    overall = {"Tran": [], "Vert": [], "Long": []}
+
+    for f in files:
+        try:
+            res = read_idf_file(f)
+        except Exception:
+            n_skip += 1
+            continue
+        sc_path = sidecar_path(f)
+        if not sc_path.exists():
+            n_skip += 1
+            continue
+        try:
+            sc = load_sidecar_samples(sc_path)
+        except Exception:
+            n_skip += 1
+            continue
+
+        per_file = {}
+        for ch in ("Tran", "Vert", "Long"):
+            sc_counts = [int(round(v / GEO_LSB)) for v in sc[ch]]
+            dec = res.samples.get(ch, [])
+            n = min(len(sc_counts), len(dec))
+            if n == 0:
+                per_file[ch] = 0.0
+                continue
+            exact = sum(1 for i in range(n) if sc_counts[i] == dec[i])
+            pct = 100.0 * exact / n
+            per_file[ch] = pct
+            overall[ch].append(pct)
+        n_ok += 1
+
+    print(f"Processed {n_ok} files (skipped {n_skip})")
+    print("Per-channel exact-match % (mean / min / max):")
+    for ch, vals in overall.items():
+        if vals:
+            avg = sum(vals) / len(vals)
+            print(f"  {ch}: mean={avg:.2f}%  min={min(vals):.2f}%  max={max(vals):.2f}%  n={len(vals)}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,49 @@
+"""Find where decoded-vs-sidecar diverges for each channel."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from minimateplus.waveform_codec import decode_waveform_v2
+from analysis_idf.recon import TARGET, TXT, load_sidecar_samples
+
+
+def main():
+    buf = TARGET.read_bytes()
+    sc = load_sidecar_samples(TXT)
+    decoded = decode_waveform_v2(buf[0x0f1f:])
+    GEO_LSB = 0.0003
+
+    for ch in ("Tran", "Vert", "Long"):
+        sc_counts = [int(round(v / GEO_LSB)) for v in sc[ch]]
+        dec = decoded[ch]
+        # Find ALL transitions where mismatches start/stop
+        first_diff = next((i for i in range(len(dec)) if dec[i] != sc_counts[i]), None)
+        if first_diff is None:
+            print(f"{ch}: NO MISMATCHES")
+            continue
+        print(f"{ch}: first diff at idx {first_diff}")
+        # Show 5 before, 5 after
+        for i in range(max(0, first_diff - 3), min(len(dec), first_diff + 8)):
+            mark = "  " if dec[i] == sc_counts[i] else "**"
+            print(f"  {mark} idx {i:4d}: sc={sc_counts[i]:6d}  dec={dec[i]:6d}  diff={dec[i]-sc_counts[i]:+d}")
+        # Where does cumulative diff exceed 100?
+        cum_match_run = 0
+        max_match_run = 0
+        match_run_start = 0
+        diff_count = 0
+        for i in range(len(dec)):
+            if dec[i] == sc_counts[i]:
+                cum_match_run += 1
+                max_match_run = max(max_match_run, cum_match_run)
+            else:
+                cum_match_run = 0
+                diff_count += 1
+        print(f"  total mismatches: {diff_count}/{len(dec)}, longest run of matches: {max_match_run}")
+        print()
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,48 @@
+"""End-to-end IDFH ingest verification."""
+from __future__ import annotations
+import sys
+import tempfile
+import json
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from sfm.waveform_store import WaveformStore
+
+
+def main():
+    idfh = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM13981/UM13981_20220805075441.IDFH"
+    txt  = idfh.parent / "TXT" / f"{idfh.name}.txt"
+
+    with tempfile.TemporaryDirectory() as td:
+        store = WaveformStore(Path(td))
+        ev, rec = store.save_imported_idf(
+            idfh.read_bytes(),
+            idfh,
+            idf_report_text=txt.read_text(errors="replace"),
+        )
+        print("=== save_imported_idf (IDFH) ===")
+        print(f"  serial:        {rec['serial']}")
+        print(f"  filename:      {rec['filename']}")
+        print(f"  filesize:      {rec['filesize']}")
+        print(f"  h5:            {rec['hdf5_filename']}")  # expect None for histogram
+        print(f"  sidecar:       {rec['sidecar_filename']}")
+        print()
+        print("=== Event ===")
+        print(f"  timestamp:     {ev.timestamp}")
+        print(f"  record_type:   {ev.record_type}")
+        print(f"  sample_rate:   {ev.sample_rate}")
+        print()
+        # Inspect sidecar to confirm intervals were stashed
+        sc_path = Path(td) / "UM13981" / f"{idfh.name}.sfm.json"
+        sc = json.loads(sc_path.read_text())
+        intervals = sc.get("extensions", {}).get("idf_intervals", [])
+        print(f"  sidecar intervals: {len(intervals)}")
+        if intervals:
+            print(f"  first interval:    {intervals[0]}")
+            print(f"  last interval:     {intervals[-1]}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,40 @@
+"""Verify the had_report=False path: ingest IDFW with no .txt."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+import tempfile
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from sfm.waveform_store import WaveformStore
+
+
+def main():
+    idfw = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM11719/UM11719_20231219162723.IDFW"
+    with tempfile.TemporaryDirectory() as td:
+        store = WaveformStore(Path(td))
+        ev, rec = store.save_imported_idf(
+            idfw.read_bytes(),
+            idfw,
+            serial_hint=None,
+            idf_report_text=None,        # ← no .txt!
+        )
+        print("=== IDFW without .txt ingest ===")
+        print(f"  serial:        {rec['serial']}")
+        print(f"  timestamp:     {ev.timestamp}")
+        print(f"  sample_rate:   {ev.sample_rate}")
+        print(f"  record_type:   {ev.record_type}")
+        print(f"  rectime_sec:   {ev.rectime_seconds}")
+        nT = len(ev.raw_samples.get('Tran', [])) if ev.raw_samples else 0
+        nV = len(ev.raw_samples.get('Vert', [])) if ev.raw_samples else 0
+        nL = len(ev.raw_samples.get('Long', [])) if ev.raw_samples else 0
+        nM = len(ev.raw_samples.get('MicL', [])) if ev.raw_samples else 0
+        print(f"  raw_samples:   Tran={nT} Vert={nV} Long={nL} MicL={nM}")
+        if ev.peak_values:
+            print(f"  peak_values:   tran={ev.peak_values.tran} vert={ev.peak_values.vert} long={ev.peak_values.long}")
+        print(f"  h5 written:    {rec['hdf5_filename']}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,102 @@
+"""End-to-end Thor report PDF rendering.
+
+Ingests an IDFW + .txt via save_imported_idf, runs gather_report_data
+(faking a minimal DB row), and renders the PDF to disk.
+"""
+from __future__ import annotations
+import sys
+import tempfile
+import json
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from sfm.waveform_store import WaveformStore
+from sfm import report_pdf
+
+
+class FakeDb:
+    """Stand-in for SeismoDb.get_event(); the renderer only needs a few cols."""
+    def __init__(self, event):
+        self.event = event
+
+    def get_event(self, _id):
+        return self.event
+
+
+def main():
+    base = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM11719"
+    idfw = base / "UM11719_20231219162723.IDFW"
+    txt  = base / "TXT" / f"{idfw.name}.txt"
+
+    with tempfile.TemporaryDirectory() as td:
+        store = WaveformStore(Path(td))
+        ev, rec = store.save_imported_idf(
+            idfw.read_bytes(),
+            idfw,
+            idf_report_text=txt.read_text(errors="replace"),
+        )
+        print(f"save_imported_idf: h5={rec['hdf5_filename']}, sidecar={rec['sidecar_filename']}")
+
+        # Verify sidecar has bw_report block
+        sc_path = Path(td) / "UM11719" / f"{idfw.name}.sfm.json"
+        sc = json.loads(sc_path.read_text())
+        bw = sc.get("bw_report", {})
+        print(f"  bw_report.available: {bw.get('available')}")
+        print(f"  bw_report.peaks.tran.ppv_ips: {bw.get('peaks', {}).get('tran', {}).get('ppv_ips')}")
+        print(f"  bw_report.mic.pspl_dbl: {bw.get('mic', {}).get('pspl_dbl')}")
+        print(f"  bw_report.histogram.n_intervals: {bw.get('histogram', {}).get('n_intervals')}")
+
+        # Build a DB-row-shaped dict from the Event for gather_report_data
+        import datetime
+        ts = ev.timestamp
+        ts_iso = None
+        if ts is not None:
+            try:
+                ts_iso = datetime.datetime(ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.second).isoformat()
+            except Exception:
+                pass
+        fake_row = {
+            "serial":              "UM11719",
+            "blastware_filename":  rec["filename"],
+            "record_type":         "Waveform",
+            "timestamp":           ts_iso,
+            "sample_rate":         ev.sample_rate,
+            "project":             ev.project_info.project if ev.project_info else None,
+            "client":              ev.project_info.client  if ev.project_info else None,
+            "operator":            ev.project_info.operator if ev.project_info else None,
+            "sensor_location":     ev.project_info.sensor_location if ev.project_info else None,
+            "created_at":          None,
+        }
+
+        rd = report_pdf.gather_report_data(FakeDb(fake_row), store, event_id="test-1")
+        print()
+        print(f"=== ReportData ===")
+        print(f"  event_id:           {rd.event_id}")
+        print(f"  serial:             {rd.serial}")
+        print(f"  record_type:        {rd.record_type}")
+        print(f"  event_datetime:     {rd.event_datetime_str}")
+        print(f"  trigger:            {rd.trigger_source}")
+        print(f"  geo_range:          {rd.geo_range_str}")
+        print(f"  sample_rate:        {rd.sample_rate_str}")
+        print(f"  firmware:           {rd.firmware}")
+        print(f"  calibration:        {rd.calibration_date} by {rd.calibration_by}")
+        print(f"  battery:            {rd.battery_volts}")
+        print(f"  PVS:                {rd.peak_vector_sum_ips} in/s at {rd.peak_vector_sum_time_s} sec")
+        print(f"  mic_pspl_dbl:       {rd.mic_pspl_dbl}")
+        print(f"  mic_zc_freq_hz:     {rd.mic_zc_freq_hz}")
+        print(f"  channel_stats:      {len(rd.channel_stats)} rows")
+        for cs in rd.channel_stats:
+            print(f"    {cs['name']}: PPV={cs['ppv_ips']} ZC={cs['zc_freq_hz']} ToP={cs['time_of_peak_s']} Acc={cs['peak_accel_g']} Disp={cs['peak_disp_in']} Test={cs['sensor_check']}")
+
+        # Render the PDF
+        out_path = REPO / "analysis_idf" / "thor_report.pdf"
+        pdf_bytes = report_pdf.render_event_report_pdf(rd)
+        out_path.write_bytes(pdf_bytes)
+        print()
+        print(f"  PDF written: {out_path} ({len(pdf_bytes)} bytes)")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,91 @@
+"""End-to-end Thor IDFH histogram report PDF rendering."""
+from __future__ import annotations
+import sys
+import tempfile
+import json
+import datetime
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from sfm.waveform_store import WaveformStore
+from sfm import report_pdf
+
+
+class FakeDb:
+    def __init__(self, event):
+        self.event = event
+
+    def get_event(self, _id):
+        return self.event
+
+
+def main():
+    # Use the multi-interval IDFH (81 + trigger row)
+    idfh = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM13981/UM13981_20220805075441.IDFH"
+    txt  = idfh.parent / "TXT" / f"{idfh.name}.txt"
+
+    with tempfile.TemporaryDirectory() as td:
+        store = WaveformStore(Path(td))
+        ev, rec = store.save_imported_idf(
+            idfh.read_bytes(),
+            idfh,
+            idf_report_text=txt.read_text(errors="replace"),
+        )
+        print(f"save_imported_idf: h5={rec['hdf5_filename']}, sidecar={rec['sidecar_filename']}")
+
+        sc_path = Path(td) / "UM13981" / f"{idfh.name}.sfm.json"
+        sc = json.loads(sc_path.read_text())
+        bw = sc.get("bw_report", {})
+        hist = bw.get("histogram", {})
+        print(f"  bw_report.histogram.start:           {hist.get('start')}")
+        print(f"  bw_report.histogram.stop:            {hist.get('stop')}")
+        print(f"  bw_report.histogram.n_intervals:     {hist.get('n_intervals')}")
+        print(f"  bw_report.histogram.interval_size:   {hist.get('interval_size')}")
+        print(f"  bw_report.histogram.interval_size_s: {hist.get('interval_size_s')}")
+        print(f"  bw_report.peaks.tran.ppv_ips:        {bw.get('peaks', {}).get('tran', {}).get('ppv_ips')}")
+
+        ts = ev.timestamp
+        ts_iso = None
+        if ts is not None:
+            try:
+                ts_iso = datetime.datetime(ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.second).isoformat()
+            except Exception:
+                pass
+        fake_row = {
+            "serial":              "UM13981",
+            "blastware_filename":  rec["filename"],
+            "record_type":         "Histogram",
+            "timestamp":           ts_iso,
+            "sample_rate":         ev.sample_rate,
+            "project":             ev.project_info.project if ev.project_info else None,
+            "client":              ev.project_info.client  if ev.project_info else None,
+            "operator":            ev.project_info.operator if ev.project_info else None,
+            "sensor_location":     ev.project_info.sensor_location if ev.project_info else None,
+            "created_at":          None,
+        }
+        rd = report_pdf.gather_report_data(FakeDb(fake_row), store, event_id="hist-1")
+
+        print()
+        print("=== ReportData (histogram) ===")
+        print(f"  is_histogram:           {rd.is_histogram}")
+        print(f"  histogram_start:        {rd.histogram_start_str}")
+        print(f"  histogram_stop:         {rd.histogram_stop_str}")
+        print(f"  histogram_n_intervals:  {rd.histogram_n_intervals}")
+        print(f"  histogram_interval_size:{rd.histogram_interval_size}")
+        print(f"  histogram_interval_times[:3]: {rd.histogram_interval_times[:3]}")
+        print(f"  histogram_interval_times[-2:]: {rd.histogram_interval_times[-2:]}")
+        print(f"  channel_stats: {len(rd.channel_stats)} rows")
+        for cs in rd.channel_stats:
+            print(f"    {cs['name']}: PPV={cs['ppv_ips']} ZC={cs['zc_freq_hz']} peak_date={cs['peak_date']} peak_time={cs['peak_time']}")
+
+        pdf_bytes = report_pdf.render_event_report_pdf(rd)
+        out_path = REPO / "analysis_idf" / "thor_report_idfh.pdf"
+        out_path.write_bytes(pdf_bytes)
+        print()
+        print(f"  PDF written: {out_path} ({len(pdf_bytes)} bytes)")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,52 @@
+"""End-to-end ingest test: feed an IDFW + .txt to save_imported_idf in a tmp store."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+import tempfile
+import shutil
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from sfm.waveform_store import WaveformStore
+
+
+def main():
+    idfw = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM11719/UM11719_20231219162723.IDFW"
+    txt  = idfw.parent / "TXT" / f"{idfw.name}.txt"
+
+    with tempfile.TemporaryDirectory() as td:
+        store = WaveformStore(Path(td))
+        ev, rec = store.save_imported_idf(
+            idfw.read_bytes(),
+            idfw,
+            serial_hint=None,
+            idf_report_text=txt.read_text(errors="replace"),
+        )
+        print("=== Save result ===")
+        print(f"  serial:    {rec['serial']}")
+        print(f"  filename:  {rec['filename']}")
+        print(f"  filesize:  {rec['filesize']}")
+        print(f"  h5:        {rec['hdf5_filename']}")
+        print(f"  sidecar:   {rec['sidecar_filename']}")
+        print()
+        print("=== Event ===")
+        print(f"  serial:        {ev.serial if hasattr(ev,'serial') else '(n/a)'}")
+        print(f"  timestamp:     {ev.timestamp}")
+        print(f"  sample_rate:   {ev.sample_rate}")
+        print(f"  record_type:   {ev.record_type}")
+        print(f"  rectime_sec:   {ev.rectime_seconds}")
+        print(f"  raw_samples:   Tran={len(ev.raw_samples.get('Tran', [])) if ev.raw_samples else 0}, Vert={len(ev.raw_samples.get('Vert', [])) if ev.raw_samples else 0}, Long={len(ev.raw_samples.get('Long', [])) if ev.raw_samples else 0}, MicL={len(ev.raw_samples.get('MicL', [])) if ev.raw_samples else 0}")
+        if ev.peak_values:
+            print(f"  peaks (txt):   Tran={ev.peak_values.tran} Vert={ev.peak_values.vert} Long={ev.peak_values.long}")
+        print()
+
+        # Verify the h5 file actually got written
+        h5path = Path(td) / "UM11719" / f"{idfw.name}.h5"
+        print(f"  h5 exists:     {h5path.exists()}  size={h5path.stat().st_size if h5path.exists() else 0}")
+        sidecar = Path(td) / "UM11719" / f"{idfw.name}.sfm.json"
+        print(f"  sidecar exists:{sidecar.exists()}  size={sidecar.stat().st_size if sidecar.exists() else 0}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,137 @@
+"""Decode IDFH histogram intervals + verify against sidecar."""
+from __future__ import annotations
+import sys
+import struct
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+
+SEGMENT_MAGIC = b"\x02\xda\x0a\x00\x00\x00"
+SEGMENT_SIZE = 732   # = 10-byte header + 10 × 72-byte intervals + 2-byte tail
+INTERVAL_SIZE = 72
+CHANNELS = ("Tran", "Vert", "Long", "MicL")
+
+
+def decode_interval(buf72: bytes) -> dict:
+    """Decode one 72-byte interval into per-channel min/max/halfp."""
+    out = {}
+    for i, ch in enumerate(CHANNELS):
+        block = buf72[i*16 : (i+1)*16]
+        mn = struct.unpack_from(">h", block, 0)[0]
+        mx = struct.unpack_from(">h", block, 2)[0]
+        sb = struct.unpack_from(">h", block, 4)[0]
+        halfp = struct.unpack_from(">H", block, 6)[0]
+        f10 = struct.unpack_from(">H", block, 10)[0]
+        f14 = struct.unpack_from(">H", block, 14)[0]
+        peak_count = max(abs(mn), abs(mx))
+        out[ch] = {
+            "min":     mn,
+            "max":     mx,
+            "field4":  sb,
+            "halfp":   halfp,
+            "field10": f10,
+            "field14": f14,
+            "peak":    peak_count,
+            "freq_hz": (512.0 / halfp) if halfp > 5 else None,
+        }
+    out["_tail"] = buf72[64:].hex(" ")
+    return out
+
+
+def walk_idfh(buf: bytes) -> list:
+    """Walk all interval records in an IDFH file."""
+    intervals = []
+    # Multi-segment file: every 02 da 0a 00 00 00 marker introduces a segment.
+    # Single-interval file: just one body header at 0xf96 of form ?? ?? 0a 00 00 00.
+    # Find them all.
+    i = 0
+    while True:
+        j = buf.find(b"\x0a\x00\x00\x00", i)
+        if j < 0:
+            break
+        # Validate: the 2 bytes before must form a length, and we want bytes
+        # [j-2 : j+6] to have a recognisable shape.  Actually the cleanest
+        # filter is "preceded by a length and followed by 00 NN 05 3f".
+        if j < 2:
+            i = j + 1
+            continue
+        # Body header form: [length_be_2][0a 00 00 00][00 NN][05 3f]
+        if j + 10 > len(buf):
+            break
+        length = int.from_bytes(buf[j-2:j], "big")
+        # Verify the segment-marker shape: [length_be][0a 00 00 00][00 NN][05 3f]
+        if buf[j+4] != 0x00:
+            i = j + 1
+            continue
+        if buf[j+6:j+8] != b"\x05\x3f":
+            i = j + 1
+            continue
+        # Header layout (10 bytes): [length_be 2B][0a 00 00 00 4B][00 NN 2B][05 3f 2B]
+        # Followed by N interval records of 72 bytes each, then 2 tail bytes.
+        # length value = (N × 72) + 10  (counts bytes from 0x0a... through interval data).
+        header_start = j - 2
+        n_intervals = (length - 10) // INTERVAL_SIZE
+        interval_start = header_start + 10
+        for k in range(n_intervals):
+            off = interval_start + k * INTERVAL_SIZE
+            if off + INTERVAL_SIZE > len(buf):
+                break
+            chunk = buf[off:off + INTERVAL_SIZE]
+            intervals.append({"offset": off, **decode_interval(chunk)})
+        i = header_start + length + 2
+    return intervals
+
+
+def main():
+    # Test against multi-segment IDFH
+    target = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM13981/UM13981_20220805075441.IDFH"
+    sc_path = target.parent / "TXT" / f"{target.name}.txt"
+    buf = target.read_bytes()
+    intervals = walk_idfh(buf)
+    print(f"=== {target.name} ===")
+    print(f"  file size: {len(buf)}")
+    print(f"  decoded intervals: {len(intervals)}")
+    # Show first 2 + last 2
+    sc_rows = []
+    for line in sc_path.read_text(errors="replace").splitlines():
+        if line.startswith("2022-") or line.startswith("2023-"):
+            sc_rows.append(line)
+    print(f"  sidecar rows: {len(sc_rows)}")
+
+    print()
+    for k in [0, 1, 78, 79, 80]:
+        if k >= len(intervals):
+            continue
+        iv = intervals[k]
+        print(f"--- interval {k} @0x{iv['offset']:04x} ---")
+        for ch in CHANNELS:
+            d = iv[ch]
+            peak_ips = d["peak"] / 32768 * 10.0
+            print(f"  {ch}: peak={d['peak']:5d} ({peak_ips:.4f} in/s)  halfp={d['halfp']:5d}  freq={d['freq_hz']}")
+        # sidecar row
+        if k < len(sc_rows):
+            print(f"  SC: {sc_rows[k]}")
+
+    # Test single-interval IDFH
+    print()
+    target2 = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM11719/UM11719_20231219162648.IDFH"
+    sc2 = target2.parent / "TXT" / f"{target2.name}.txt"
+    buf2 = target2.read_bytes()
+    intervals2 = walk_idfh(buf2)
+    print(f"=== {target2.name} ===")
+    print(f"  file size: {len(buf2)}, decoded intervals: {len(intervals2)}")
+    if intervals2:
+        iv = intervals2[0]
+        for ch in CHANNELS:
+            d = iv[ch]
+            peak_ips = d["peak"] / 32768 * 10.0
+            print(f"  {ch}: peak={d['peak']:5d} ({peak_ips:.4f} in/s)  halfp={d['halfp']:5d}  freq={d['freq_hz']}")
+        sc_rows2 = [l for l in sc2.read_text(errors='replace').splitlines() if l.startswith("2023-")]
+        if sc_rows2:
+            print(f"  SC: {sc_rows2[0]}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,41 @@
+"""Find IDFH interval period via auto-correlation of structural patterns."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+from collections import Counter
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+
+def main():
+    target = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM13981/UM13981_20220805075441.IDFH"
+    buf = target.read_bytes()
+    body_start = 0xF96
+    body_end   = 0x270C
+    body = buf[body_start:body_end]
+    print(f"body size: {len(body)} bytes (file {len(buf)} bytes)")
+
+    # For each candidate interval size, count how many bytes at fixed offsets within
+    # each interval are zero (consistent column-zero pattern indicates correct size).
+    print()
+    print("=== zero-column score by interval size (higher = more likely) ===")
+    best = []
+    for sz in range(16, 100):
+        n = len(body) // sz
+        if n < 30:
+            continue
+        # For each column position within an interval, count how many of n intervals have zero
+        score = 0
+        for col in range(sz):
+            zeros = sum(1 for i in range(n) if body[i*sz + col] == 0)
+            if zeros >= n * 0.9:
+                score += 1
+        best.append((score, sz, n))
+    best.sort(reverse=True)
+    for score, sz, n in best[:10]:
+        print(f"  size={sz:3d}  n_intervals={n}  consistently-zero-cols={score}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,40 @@
+"""Per-file accuracy + sample-count details."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from micromate.idf_file import read_idf_file
+from analysis_idf.recon import load_sidecar_samples
+
+
+def main():
+    root = REPO / "tests/fixtures/THORDATA_example"
+    files = sorted([f for f in root.rglob("*.IDFW") if not str(f).endswith(".CDB")])
+    GEO_LSB = 0.0003
+    # Limit to first 15 successful files for detail.
+    shown = 0
+    for f in files:
+        try:
+            res = read_idf_file(f)
+        except Exception:
+            continue
+        sc_path = f.parent / "TXT" / f"{f.name}.txt"
+        if not sc_path.exists():
+            continue
+        sc = load_sidecar_samples(sc_path)
+        sc_tran = [int(round(v / GEO_LSB)) for v in sc["Tran"]]
+        dec = res.samples.get("Tran", [])
+        n = min(len(sc_tran), len(dec))
+        exact = sum(1 for i in range(n) if sc_tran[i] == dec[i]) if n else 0
+        pct = 100.0 * exact / n if n else 0.0
+        print(f"{f.name:40s}  size={f.stat().st_size:6d}  sc_n={len(sc_tran):4d}  dec_n={len(dec):4d}  exact={pct:.1f}%")
+        shown += 1
+        if shown >= 20:
+            break
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,64 @@
+"""Look at what's at the divergence boundary."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from minimateplus.waveform_codec import walk_body, find_data_start, parse_segment_header
+from analysis_idf.recon import TARGET, TXT, load_sidecar_samples
+
+
+def main():
+    buf = TARGET.read_bytes()
+    body = buf[0x0f1f:]
+    start = find_data_start(body)
+    print(f"data_start: {start}  (= file offset 0x{0x0f1f + start:04x})")
+
+    blocks = walk_body(body, start)
+    print(f"{len(blocks)} blocks total")
+    print()
+
+    # First 25 blocks
+    print("=== first 30 blocks ===")
+    for i, b in enumerate(blocks[:30]):
+        body_off = 0x0f1f + b.offset
+        if b.tag_hi == 0x40:
+            hdr = parse_segment_header(b)
+            print(f"  [{i:3d}] @0x{body_off:04x}  {b.kind}  (segment header)  counter={hdr['counter'] if hdr else '?'}  field2={hdr['field2'].hex() if hdr else '?'}  anchor={hdr['anchor_bytes'].hex() if hdr else '?'}  tail={hdr['tail'].hex() if hdr else '?'}")
+        else:
+            print(f"  [{i:3d}] @0x{body_off:04x}  {b.kind}  len={b.length}  data={b.data[:16].hex()}")
+    print()
+
+    # Cumulative sample counts per block to find which block contains sample 254
+    print("=== cumulative samples through blocks ===")
+    cur_ch = "Tran"
+    rotation = ["Vert", "Long", "MicL", "Tran"]
+    seg_count = 0
+    samples_in_curseg = 2  # preamble Tran[0], Tran[1]
+    for i, b in enumerate(blocks[:30]):
+        if b.tag_hi == 0x40:
+            seg_count += 1
+            prev_ch = cur_ch
+            cur_ch = rotation[(seg_count - 1) % 4]
+            print(f"  [{i:3d}] 40 02 -> end of {prev_ch} segment, start {cur_ch} (segment {seg_count})")
+            samples_in_curseg = 2  # anchors
+        elif (b.tag_hi & 0xF0) == 0x10:
+            nn = ((b.tag_hi & 0x0F) << 8) | b.tag_lo
+            samples_in_curseg += nn
+            print(f"  [{i:3d}] {b.kind} nibble: +{nn} samples, ch={cur_ch}, ch_total~{samples_in_curseg}")
+        elif (b.tag_hi & 0xF0) == 0x20:
+            nn = ((b.tag_hi & 0x0F) << 8) | b.tag_lo
+            samples_in_curseg += nn
+            print(f"  [{i:3d}] {b.kind} int8: +{nn} samples, ch={cur_ch}, ch_total~{samples_in_curseg}")
+        elif b.tag_hi == 0x00:
+            samples_in_curseg += b.tag_lo
+            print(f"  [{i:3d}] {b.kind} RLE: +{b.tag_lo}, ch={cur_ch}, ch_total~{samples_in_curseg}")
+        elif b.tag_hi == 0x30:
+            samples_in_curseg += b.tag_lo
+            print(f"  [{i:3d}] {b.kind} packed12: +{b.tag_lo} samples, ch={cur_ch}, ch_total~{samples_in_curseg}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,89 @@
+"""Reconnaissance helpers for cracking the Thor IDFW binary."""
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+TARGET = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM11719/UM11719_20231219162723.IDFW"
+TXT = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM11719/TXT/UM11719_20231219162723.IDFW.txt"
+
+
+def hex_at(buf: bytes, off: int, n: int = 32) -> str:
+    chunk = buf[off : off + n]
+    hexs = " ".join(f"{b:02x}" for b in chunk)
+    asc = "".join(chr(b) if 32 <= b < 127 else "." for b in chunk)
+    return f"{off:04x}: {hexs}  {asc}"
+
+
+def find_all(buf: bytes, needle: bytes) -> list[int]:
+    out: list[int] = []
+    i = 0
+    while True:
+        j = buf.find(needle, i)
+        if j < 0:
+            break
+        out.append(j)
+        i = j + 1
+    return out
+
+
+def load_sidecar_samples(path: Path) -> dict[str, list[float]]:
+    """Parse the txt sample table — Tran/Vert/Long/MicL."""
+    out = {"Tran": [], "Vert": [], "Long": [], "MicL": []}
+    in_block = False
+    for line in path.read_text(errors="replace").splitlines():
+        if not in_block:
+            if line.strip() == "Waveform Data Channels":
+                in_block = True
+            continue
+        if line.startswith("Waveform Data USB Channels"):
+            break
+        parts = line.split("\t")
+        # First row is the header "\tTran\tVert\tLong\tMicL"
+        if len(parts) >= 5 and parts[1] == "Tran":
+            continue
+        if len(parts) < 5:
+            continue
+        try:
+            out["Tran"].append(float(parts[1]))
+            out["Vert"].append(float(parts[2]))
+            out["Long"].append(float(parts[3]))
+            out["MicL"].append(float(parts[4]))
+        except ValueError:
+            continue
+    return out
+
+
+def main():
+    buf = TARGET.read_bytes()
+    samples = load_sidecar_samples(TXT)
+    print(f"file size: {len(buf)} bytes")
+    print(f"sample rows: Tran={len(samples['Tran'])} Vert={len(samples['Vert'])} Long={len(samples['Long'])} MicL={len(samples['MicL'])}")
+    print(f"first 6 Tran samples: {samples['Tran'][:6]}")
+    print(f"first 6 Vert samples: {samples['Vert'][:6]}")
+    print(f"first 6 Long samples: {samples['Long'][:6]}")
+    print(f"first 6 MicL samples: {samples['MicL'][:6]}")
+
+    print()
+    print("=== BW magic '00 02 00' positions ===")
+    hits = find_all(buf, b"\x00\x02\x00")
+    print(f"{len(hits)} hits")
+    for h in hits[:20]:
+        print(hex_at(buf, h, 24))
+
+    print()
+    print("=== '40 02' segment-header positions ===")
+    hits = find_all(buf, b"\x40\x02")
+    print(f"{len(hits)} hits")
+    for h in hits:
+        ctx_pre = buf[max(0, h - 4): h].hex()
+        ctx_post = buf[h: h + 20].hex()
+        # Show byte preceding to help identify real headers vs casual occurrences
+        print(f"  0x{h:04x}  pre={ctx_pre}  post={ctx_post}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,40 @@
+"""Find each segment boundary in the channel and check if errors reset there."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from minimateplus.waveform_codec import decode_waveform_v2
+from analysis_idf.recon import TARGET, TXT, load_sidecar_samples
+
+
+def main():
+    buf = TARGET.read_bytes()
+    sc = load_sidecar_samples(TXT)
+    decoded = decode_waveform_v2(buf[0x0f1f:])
+    GEO_LSB = 0.0003
+
+    for ch in ("Tran", "Vert", "Long"):
+        sc_counts = [int(round(v / GEO_LSB)) for v in sc[ch]]
+        dec = decoded[ch]
+        # Find every transition where error becomes zero from nonzero (or grows from zero)
+        # Print indices where dec resyncs back to exact match.
+        n = min(len(sc_counts), len(dec))
+        events = []
+        prev_match = True
+        for i in range(n):
+            match = sc_counts[i] == dec[i]
+            if match != prev_match:
+                kind = "RESYNC" if match else "DIVERGE"
+                events.append((i, kind, sc_counts[i], dec[i]))
+                prev_match = match
+        print(f"{ch}: {len(events)} transitions")
+        for i, kind, sc_v, dec_v in events[:20]:
+            print(f"  idx {i:4d}  {kind:8s}  sc={sc_v:6d}  dec={dec_v:6d}  diff={dec_v-sc_v:+d}")
+        print()
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,46 @@
+"""Smoke-test read_idf_file on IDFH across the corpus."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from micromate.idf_file import read_idf_file
+
+
+def main():
+    target = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM11719/UM11719_20231219162648.IDFH"
+    result = read_idf_file(target)
+    ev = result.event
+    print(f"=== {target.name} ===")
+    print(f"  signature:   {result.signature}")
+    print(f"  serial:      {ev.serial}")
+    print(f"  timestamp:   {ev.timestamp}")
+    print(f"  sample_rate: {ev.sample_rate}")
+    print(f"  kind:        {ev.kind}")
+    print(f"  intervals:   {len(result.intervals or [])}")
+    print(f"  peaks:       T={ev.peaks.transverse_ips:.4f} V={ev.peaks.vertical_ips:.4f} L={ev.peaks.longitudinal_ips:.4f}")
+    print()
+
+    root = REPO / "tests/fixtures/THORDATA_example"
+    files = list(root.rglob("*.IDFH"))
+    ok = fail = nyi = 0
+    total_intervals = 0
+    for f in files:
+        try:
+            r = read_idf_file(f)
+            ok += 1
+            total_intervals += len(r.intervals or [])
+        except NotImplementedError:
+            nyi += 1
+        except Exception as exc:
+            fail += 1
+            if fail <= 3:
+                print(f"  FAIL: {f.name}: {type(exc).__name__}: {exc}")
+    print(f"Corpus: {len(files)} IDFH files | ok={ok} fail={fail} nyi={nyi}")
+    print(f"Total intervals decoded: {total_intervals}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,48 @@
+"""Smoke-test read_idf_file across the sample corpus."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from micromate.idf_file import read_idf_file, geo_count_to_ips, mic_count_to_psi
+
+
+def main():
+    target = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM11719/UM11719_20231219162723.IDFW"
+    result = read_idf_file(target)
+    ev = result.event
+    print(f"=== {target.name} ===")
+    print(f"  signature: {result.signature}")
+    print(f"  serial:    {ev.serial}")
+    print(f"  timestamp: {ev.timestamp}")
+    print(f"  sample_rate: {ev.sample_rate}")
+    print(f"  record_time: {ev.record_time_sec}")
+    print(f"  calibration: {result.binary_metadata.calibration_date}")
+    print(f"  Tran samples: {len(result.samples['Tran'])}, peak_ips={ev.peaks.transverse_ips:.4f}")
+    print(f"  Vert samples: {len(result.samples['Vert'])}, peak_ips={ev.peaks.vertical_ips:.4f}")
+    print(f"  Long samples: {len(result.samples['Long'])}, peak_ips={ev.peaks.longitudinal_ips:.4f}")
+    print(f"  MicL samples: {len(result.samples['MicL'])}")
+    print()
+
+    # Corpus sweep
+    root = REPO / "tests/fixtures/THORDATA_example"
+    files = [f for f in root.rglob("*.IDFW") if not str(f).endswith(".CDB")]
+    ok = fail = nyi = 0
+    for f in files:
+        try:
+            r = read_idf_file(f)
+            ok += 1
+        except NotImplementedError:
+            nyi += 1
+        except Exception as exc:
+            fail += 1
+            if fail <= 5:
+                print(f"  FAIL: {f.name}: {type(exc).__name__}: {exc}")
+    print()
+    print(f"Corpus: {len(files)} IDFW files | ok={ok} fail={fail} not-implemented={nyi}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,47 @@
+"""Verify build_bw_report_from_idf against a known sidecar."""
+from __future__ import annotations
+import json
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from micromate.idf_ascii_report import parse_idf_report
+from micromate.idf_to_bw_report import build_bw_report_from_idf
+from micromate.idf_file import read_idf_file
+
+
+def show(prefix: str, d: dict, indent: int = 0):
+    for k, v in d.items():
+        if isinstance(v, dict):
+            print(f"{'  '*indent}{prefix}{k}:")
+            show("", v, indent + 1)
+        else:
+            print(f"{'  '*indent}{prefix}{k}: {v!r}")
+
+
+def main():
+    base = REPO / "tests/fixtures/THORDATA_example/THORDATA_example/UPMC Presby/UM11719"
+    idfw = base / "UM11719_20231219162723.IDFW"
+    txt  = base / "TXT" / f"{idfw.name}.txt"
+
+    report_dict = parse_idf_report(txt.read_text(errors="replace"))
+    res = read_idf_file(idfw)
+    bw = build_bw_report_from_idf(report_dict, binary_md=res.binary_metadata)
+
+    print("=== IDFW → bw_report ===")
+    show("", bw)
+
+    print()
+    print("=== IDFH (single trigger row) ===")
+    idfh = base / "UM11719_20231219162648.IDFH"
+    txt_h = base / "TXT" / f"{idfh.name}.txt"
+    rh = parse_idf_report(txt_h.read_text(errors="replace"))
+    res_h = read_idf_file(idfh)
+    bw_h = build_bw_report_from_idf(rh, binary_md=res_h.binary_metadata, intervals=res_h.intervals)
+    show("", bw_h)
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,73 @@
+"""Trace Tran sample-by-sample to find exactly where the codec drifts."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from analysis_idf.recon import TARGET, TXT, load_sidecar_samples
+
+
+def s4(n: int) -> int:
+    return n if n < 8 else n - 16
+
+
+def i8(b: int) -> int:
+    return b if b < 128 else b - 256
+
+
+def main():
+    buf = TARGET.read_bytes()
+    sc = load_sidecar_samples(TXT)
+    GEO_LSB = 0.0003
+    sc_tran = [int(round(v / GEO_LSB)) for v in sc["Tran"]]
+
+    body = buf[0x0f1f:]
+    # Tran[0], Tran[1] from preamble
+    t0 = int.from_bytes(body[3:5], "big", signed=True)
+    t1 = int.from_bytes(body[5:7], "big", signed=True)
+    print(f"preamble Tran[0]={t0}  Tran[1]={t1}  (sidecar: {sc_tran[0]}, {sc_tran[1]})")
+
+    # Block 0: 10 f8 at body[7:9]
+    print(f"block 0: tag {body[7]:02x} {body[8]:02x}")
+    print(f"  block 0 first 10 data bytes: {body[9:19].hex()}")
+
+    # Walk block 0 manually, comparing each sample
+    cur = t1
+    samples = [t0, t1]
+    block_off = 7
+    nn = body[8]
+    print(f"  NN = {nn}")
+    data = body[9 : 9 + nn // 2]
+    for byi, byte in enumerate(data):
+        for nib_idx, nib in enumerate(((byte >> 4) & 0xF, byte & 0xF)):
+            cur += s4(nib)
+            samples.append(cur)
+            idx = len(samples) - 1
+            if 0 <= idx < len(sc_tran):
+                sc_v = sc_tran[idx]
+                match = "✓" if sc_v == cur else "✗"
+                if idx < 12 or 240 <= idx <= 260:
+                    print(f"    idx {idx:3d}: nibble byte={byte:02x} nib={nib:x} delta={s4(nib):+d}  cur={cur:+d}  sc={sc_v:+d}  {match}")
+
+    print(f"end of block 0: cur={cur}, len(samples)={len(samples)}, decoder expected 250 here")
+    # Block 1: 20 28 starts at offset 9 + 124 = 133 from block_off=7
+    block1_off = 9 + nn // 2
+    print(f"block 1: tag {body[block1_off]:02x} {body[block1_off+1]:02x} (expecting 20 28)")
+    nn1 = body[block1_off + 1]
+    print(f"  block 1 NN = {nn1}")
+    data1 = body[block1_off + 2 : block1_off + 2 + nn1]
+    for byi, byte in enumerate(data1):
+        cur += i8(byte)
+        samples.append(cur)
+        idx = len(samples) - 1
+        if idx < len(sc_tran):
+            sc_v = sc_tran[idx]
+            match = "✓" if sc_v == cur else "✗"
+            if 248 <= idx <= 295:
+                print(f"    idx {idx:3d}: int8 byte={byte:02x} delta={i8(byte):+d}  cur={cur:+d}  sc={sc_v:+d}  {match}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,42 @@
+"""Feed candidate body offsets to the BW codec and compare with sidecar."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from minimateplus.waveform_codec import decode_waveform_v2, walk_body, find_data_start
+from analysis_idf.recon import TARGET, TXT, load_sidecar_samples
+
+
+def main():
+    buf = TARGET.read_bytes()
+    sc = load_sidecar_samples(TXT)
+    # Sidecar samples in 0.0003 counts (Thor geo LSB).
+    sc_tran = [int(round(v / 0.0003)) for v in sc["Tran"][:30]]
+    sc_vert = [int(round(v / 0.0003)) for v in sc["Vert"][:30]]
+    sc_long = [int(round(v / 0.0003)) for v in sc["Long"][:30]]
+    sc_micl = [int(round(v / 1e-6)) for v in sc["MicL"][:30]]  # 1 µ unit for mic? Will iterate.
+    print(f"sidecar Tran (counts): {sc_tran}")
+    print(f"sidecar Vert (counts): {sc_vert}")
+    print(f"sidecar Long (counts): {sc_long}")
+    print(f"sidecar MicL (×1e-6):  {sc_micl}")
+    print()
+
+    # Try candidate body start offsets.
+    for off in (0x0f1f, 0x1057, 0x11f1, 0x1333, 0x1bde, 0x0d30):
+        print(f"=== body @ 0x{off:04x} ===")
+        body = buf[off:]
+        decoded = decode_waveform_v2(body)
+        if not decoded:
+            print("  decode_waveform_v2 returned None")
+            continue
+        for ch in ("Tran", "Vert", "Long", "MicL"):
+            arr = decoded.get(ch, [])
+            print(f"  {ch}[{len(arr)}]: {arr[:20]}")
+        print()
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,51 @@
+"""Verify decode_waveform_v2 against sidecar across all 2304 samples per channel."""
+from __future__ import annotations
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO))
+
+from minimateplus.waveform_codec import decode_waveform_v2
+from analysis_idf.recon import TARGET, TXT, load_sidecar_samples
+
+
+def main():
+    buf = TARGET.read_bytes()
+    sc = load_sidecar_samples(TXT)
+    body = buf[0x0f1f:]
+    decoded = decode_waveform_v2(body)
+
+    print(f"Sidecar lengths: Tran={len(sc['Tran'])} Vert={len(sc['Vert'])} Long={len(sc['Long'])} MicL={len(sc['MicL'])}")
+    print(f"Decoded lengths: Tran={len(decoded['Tran'])} Vert={len(decoded['Vert'])} Long={len(decoded['Long'])} MicL={len(decoded['MicL'])}")
+    print()
+
+    GEO_LSB = 0.0003  # in/s per count
+    for ch in ("Tran", "Vert", "Long"):
+        sc_counts = [int(round(v / GEO_LSB)) for v in sc[ch]]
+        dec = decoded[ch]
+        n = min(len(sc_counts), len(dec))
+        matches = sum(1 for i in range(n) if sc_counts[i] == dec[i])
+        first_mismatch = next((i for i in range(n) if sc_counts[i] != dec[i]), None)
+        print(f"{ch}: compared {n}, exact matches {matches} ({100*matches/n:.2f}%)")
+        if first_mismatch is not None:
+            i = first_mismatch
+            print(f"  first mismatch at idx {i}: sidecar={sc_counts[i]} ({sc[ch][i]}), decoded={dec[i]}")
+            print(f"  context sidecar[{i-2}..{i+5}]: {sc_counts[max(0,i-2):i+5]}")
+            print(f"  context decoded[{i-2}..{i+5}]: {dec[max(0,i-2):i+5]}")
+
+    # MicL: find the multiplicative factor that fits
+    print()
+    print("=== MicL scale analysis ===")
+    sc_micl = sc["MicL"]
+    dec_micl = decoded["MicL"]
+    # Skip zero values when computing ratio
+    ratios = [sc_micl[i] / dec_micl[i] for i in range(min(50, len(sc_micl), len(dec_micl))) if dec_micl[i] != 0]
+    if ratios:
+        avg = sum(ratios) / len(ratios)
+        print(f"  avg ratio sidecar/decoded over first 50 nonzero: {avg:.4e} (n={len(ratios)})")
+        print(f"  ratios sample: {[f'{r:.4e}' for r in ratios[:6]]}")
+
+
+if __name__ == "__main__":
+    main()
@@ -6,11 +6,68 @@ Series IV event-file format.  Sibling to
 Series III "Rosetta Stone") — this doc holds what we know so far and
 the open questions still to crack.

-**Status (2026-05-20):** ASCII text sidecar fully decoded (1,014
-sample files round-trip).  Binary `.IDFH` / `.IDFW` codec
-**not yet implemented** — binaries are stored opaquely by
-`WaveformStore.save_imported_idf`, with metadata sourced from the
-paired `.txt` sidecar.
+**Status (2026-05-28):** ASCII text sidecar fully decoded (1,014
+sample files round-trip).  **Thor IDFW** binary now decodes via
+`micromate.idf_file.read_idf_file()` — reuses the BW segment-rotated
+block codec verbatim at fixed body offset `0x0f1f`; metadata (serial,
+timestamp, sample_rate, record_time, calibration_date) extracted from
+the binary header.  Sample fidelity is 87–99% byte-exact on quiet
+events; loud events hit the BW codec's known walker-stops-early
+limitation.  Residual ~3% drift on per-sample deltas (likely a
+Thor-specific 12-bit delta refinement not yet modelled).
+
+**Thor IDFH histograms also decoded.**  Body has one or more segments;
+each 12-byte segment header `[length_be 2B][0a 00 00 00][00 NN][05 3f]`
+introduces `N = (length - 10) // 72` interval records of 72 bytes
+each.  Each interval = 4 × 16-byte per-channel records:
+`[int16 min][int16 max][int16 ??][uint16 halfp][2B 00][uint16 ??][2B 00][uint16 ??]`.
+Geo peak `= max(|min|, |max|) / 32768 × 10` in/s (matches sidecar
+~1.8%); freq `= 512 / halfp` Hz (None for halfp ≤ 5 → ">100"
+sentinel).  Corpus: **all 859 Thor IDFH files decode, 181,071
+intervals**.  Wired through `read_idf_file()` →
+`save_imported_idf()` → sidecar's `extensions.idf_intervals`.
+
+**Note on the BE9439 outliers in the example corpus:** Two files
+(`BE9439_20200713131747.IDFW` and `BE9439_20200713124251.IDFH`) are
+**Series III Blastware** binaries, not Thor.  Provenance: TMI tried
+to use Thor to manage auto-call-homes for Series III units; the
+experiment didn't work out, but it did leave a few BW event files
+in Thor's per-serial directory structure with `.IDFW`/`.IDFH`
+extensions — Thor's forwarder applied its own naming convention to
+the BW bodies it was relaying.  Their header `10 00 01 80 00 00
+Instantel STRT ff fe <end_key> <start_key>` is the BW SUB 5A STRT
+record, not a Thor body preamble.  The reader detects them by
+signature and raises `NotImplementedError` pointing callers at
+`read_blastware_file()`, which extracts BW-format peaks from them.
+
+**Still NYI for Thor IDFH:** per-channel `int16 field4` (possibly
+time-of-peak); the two uint16 fields (probably PVS contributions);
+8-byte interval tail (PVS data); mic dB(L) exact conversion constant.
+
+### Codec breakthroughs (2026-05-28)
+
+- **Body offset is a fixed `0x0f1f`** across 151/154 corpus IDFW
+  files.  Preceded by a 4-byte record-type marker (`46 00 00 00`)
+  + magic preamble `00 02 00 [Tran[0] BE] [Tran[1] BE]`.
+- **Sample stream is BW's segment-rotated block codec verbatim.**
+  Thor reuses `10 NN` (nibble), `20 NN` (int8), `00 NN` (RLE),
+  `30 NN` (packed12), `40 02` (segment header) tags with the same
+  semantics.  Channel rotation Tran→Vert→Long→MicL.
+- **Geo LSB = 0.0003 in/s** (not BW's 0.005), because Thor's 16-bit
+  ADC range maps to 10 in/s without the 16-count BW quantization step.
+- **Mic ≈ 2.14×10⁻⁶ psi/count** (rough scale; refine after channel
+  block calibration constants are decoded).
+- **BW compliance anchor `\xbe\x80\x00\x00\x00\x00` reappears at
+  IDFW offset 0x952** — sample_rate at anchor−6 (uint16 BE),
+  record_time at anchor+6 (float32 BE), same layout as BW.
+- **Event timestamp at offset 0x97A** — 8 bytes `[day][month]
+  [year_be][unk][hour][min][sec]`.  Stop-time mirrors at 0x982.
+- **Serial as null-terminated ASCII at 0x14E**.
+- **Calibration date** at 0x194–0x197 (day, month, year_be).
+- Per-sample residual drift of ~3% suggests Thor encodes int8/nibble
+  deltas with an extra refinement bit that BW doesn't carry —
+  unsolved; errors resync within a few samples so cumulative impact
+  is small.

 ---

@@ -210,8 +210,7 @@ def parse_idf_report(text: Union[str, bytes]) -> Dict[str, Any]:
        "long_peak_acceleration",
        "tran_peak_displacement", "vert_peak_displacement",
        "long_peak_displacement",
-        "tran_time_of_peak", "vert_time_of_peak", "long_time_of_peak",
-        "mic_time_of_peak", "mic_zc_freq",
+        "mic_zc_freq",
    )
    for key in float_fields:
        v = raw.get(key)
@@ -223,6 +222,22 @@ def parse_idf_report(text: Union[str, bytes]) -> Dict[str, Any]:
        else:
            out.pop(key, None)

+    # Time-of-peak: Thor labels these "TimeofPeak" (lowercase "of") so the
+    # normalizer produces "*_timeof_peak".  Map them to the canonical
+    # ``*_time_of_peak`` output keys for downstream consumers.
+    for raw_key, out_key in (
+        ("tran_timeof_peak", "tran_time_of_peak"),
+        ("vert_timeof_peak", "vert_time_of_peak"),
+        ("long_timeof_peak", "long_time_of_peak"),
+        ("mic_timeof_peak",  "mic_time_of_peak"),
+    ):
+        v = raw.get(raw_key)
+        if v is None:
+            continue
+        fv = _parse_float(v)
+        if fv is not None:
+            out[out_key] = fv
+
    # Microphone — Thor reports MicPSPL (dB(L)) which is the closest
    # analogue to BW's mic_ppv.  The raw "99.4 dB(L)" string stays in
    # `out` under the original `mic_pspl` key for display; the parsed
@@ -1,64 +1,530 @@
 """
-micromate/idf_file.py — placeholder for the Thor IDF binary codec.
+micromate/idf_file.py — Thor IDF binary codec.

-Thor's ``.IDFH`` (histogram) and ``.IDFW`` (waveform) event files are an
-Instantel proprietary binary format that has not yet been reverse-
-engineered.  Today seismo-relay treats them as opaque blobs:
-``WaveformStore.save_imported_idf`` stores the bytes verbatim and reads
-all device-authoritative metadata from the paired ``.IDFW.txt`` /
-``.IDFH.txt`` ASCII sidecar (parsed by ``idf_ascii_report.py``).
+Decodes the Instantel Micromate Series IV ``.IDFW`` (waveform) and
+``.IDFH`` (histogram) binary on-disk format.  Sister module to
+``minimateplus/event_file_io.py``.

-When we crack the binary codec — same reverse-engineering playbook we
-used to byte-perfect-parse Series III BW files (see
-``docs/instantel_protocol_reference.md`` and ``minimateplus/event_file_io.py``)
-— this module will grow:
+Status (2026-05-28):

-  - ``read_idf_file(path) -> IdfEvent``
-        Parse a ``.IDFW``/``.IDFH`` binary and return a fully populated
-        ``IdfEvent`` whose waveform-sample arrays come from the binary
-        (the .txt sidecar's tabular sample block being a best-effort
-        check).  Lets us ingest Thor events even when the operator
-        hasn't enabled the .txt exporter — closing the
-        ``had_report=False`` gap that the thor-watcher forwarder
-        currently tolerates as a known limitation.
+- **Genuine Series IV / Thor binaries** are all signed
+  ``00 12 01 00 00 00 Instantel\\0`` (sig-A in earlier notes).  Two
+  Series III (Blastware) binaries appear in the example corpus
+  (``BE9439_*``) — they share the ``.IDFW``/``.IDFH`` extension by
+  filing convention but carry a BW STRT header (``10 00 01 80 00 00
+  Instantel STRT...``) and are NOT Thor data.  The reader detects
+  them by signature and raises NotImplementedError pointing callers
+  at ``minimateplus.event_file_io.read_blastware_file()``.
+- **IDFW waveform body** reuses the BW segment-rotated block codec
+  verbatim.  Body always starts at file offset ``0x0f1f``.  Samples
+  decoded via ``minimateplus.waveform_codec.decode_waveform_v2``
+  with 87–99% byte-exact match against ``.IDFW.txt`` sidecar (quiet
+  events).  Loud events hit the BW codec's known walker-stops-early
+  limit.  Residual ~3% drift on per-sample deltas — likely a
+  Thor-specific 12-bit delta refinement that BW's codec doesn't
+  model.  Geo LSB = 0.0003 in/s; mic factor ~2.14e-6 psi/count.
+- **IDFH histogram body**: 12-byte segment header
+  ``[len_be 2B] 0a 00 00 00 [00 NN_counter] 05 3f`` introduces a
+  segment of ``N`` 72-byte interval records (``N = (len - 10) // 72``).
+  Each record holds 4 × 16-byte per-channel min/max/halfp + 8-byte
+  tail.  Geo peaks via ``max(|min|, |max|) / 32768 × 10`` in/s
+  (matches sidecar within ~1.8%), freq via ``512 / halfp`` Hz.
+  **All 859 Thor IDFH files in the corpus decode (181,071 intervals).**
+- Binary metadata directly extracted: serial, timestamp, sample_rate,
+  record_time, calibration_date.  Other fields fall back to the paired
+  ``.IDFW.txt`` / ``.IDFH.txt`` sidecar (consumed by
+  ``WaveformStore.save_imported_idf``).

-  - ``write_idf_file(path, event)`` (eventually)
-        Round-trip event reconstruction, used for verifying the codec
-        against captured device files the way ``write_blastware_file``
-        verifies the Series III codec.
-
-  - Helpers for decoding the binary's per-channel sample arrays into
-    physical units, the per-event flash buffer's monitor-log records,
-    etc.
-
-The reverse-engineering path: pair every ``.IDFW`` binary in
-``thor-watcher/example-data/`` with its sibling ``.IDFW.txt``, treating
-the txt's "Waveform Data Channels" block as ground-truth, and align
-the binary's per-channel int16-or-similar arrays against it.  Header
-fields (sample rate, channel count, record time, timestamps) sit before
-the sample block — same approach as the BW codec where ASCII strings
-inside the binary (``Project:``, ``Client:``, etc.) anchored field
-discovery.
+The full reverse-engineering writeup lives in
+``docs/idf_protocol_reference.md``.
 """

 from __future__ import annotations

+import datetime
+import struct
+from dataclasses import dataclass
 from pathlib import Path
-from typing import Union
+from typing import Optional, Union

-from .models import IdfEvent
+from minimateplus.waveform_codec import decode_waveform_v2
+
+from .models import IdfEvent, IdfPeaks, IdfReport


-def read_idf_file(path: Union[str, Path]) -> "IdfEvent":
-    """Parse a Thor ``.IDFW``/``.IDFH`` binary into an ``IdfEvent``.
+# Genuine Series IV / Thor IDF binary signature: 6 bytes, then ASCII "Instantel".
+_THOR_PREFIX = b"\x00\x12\x01\x00\x00\x00"
+# Stray Series III (Blastware) binaries that occasionally turn up in Thor
+# corpus directories renamed to the .IDFW/.IDFH convention.  Their header
+# (`10 00 01 80 00 00 Instantel STRT ...`) is byte-for-byte a BW SUB 5A
+# STRT record, not a Thor binary.  Detected so we can refuse-and-route
+# rather than mis-parse.
+_BW_STRAY_PREFIX = b"\x10\x00\x01\x80\x00\x00"
+_INSTANTEL_TAG = b"Instantel"

-    Not yet implemented.  When implemented, this will be the canonical
-    entry point for reading Thor binaries — the ASCII sidecar parser
-    becomes an optional fast-path metadata supplement rather than the
-    sole source of device-authoritative data.
+# Most common body offset for sig-A IDFW files (~50% of prod events;
+# 151/154 in the original tests/fixtures/THORDATA_example corpus).  The
+# body is the segment-rotated block stream consumed by decode_waveform_v2;
+# bytes [0:3] are the magic ``00 02 00`` preamble.  Production events
+# routinely use other offsets — see :func:`_find_waveform_body_offset`
+# for the dynamic scan.  This constant survives only as the priority hint.
+_BODY_START_SIG_A = 0x0F1F
+
+# Magic bytes that mark a candidate waveform-body preamble.
+_BODY_MAGIC = b"\x00\x02\x00"
+
+# Where to start looking for body candidates inside the file.  Skip the
+# fixed-header region where the same magic legitimately appears inside
+# channel-test records and the compliance block (offsets 0x015d, 0x091c,
+# 0x0ae2, 0x0d30 in observed events).
+_BODY_SCAN_FLOOR = 0x0E00
+
+# Geophone count → in/s, derived from sidecar ground truth: the smallest
+# non-zero sample in 1,014-file corpus is 0.0003 in/s.
+_GEO_LSB_IPS = 0.0003
+
+# Microphone count → psi, derived from sidecar regression on 50 sample
+# pairs from UM11719_20231219162723.IDFW (mic-heavy event).
+_MIC_LSB_PSI = 2.14e-6
+
+# IDFH histogram constants.
+_IDFH_INTERVAL_SIZE = 72        # bytes per per-interval record
+_IDFH_SEGMENT_HEADER = 10       # bytes: [len_be 2B][0a 00 00 00 4B][00 NN 2B][05 3f 2B]
+_IDFH_SEGMENT_TAIL   = 2        # bytes after the interval data block, before next marker
+_IDFH_HALFP_FREQ_NUM = 512.0    # freq_hz = NUM / halfp; halfp ≤ 5 means ">100 Hz" sentinel
+_IDFH_GEO_FULL_SCALE = 10.0     # in/s — Normal range
+_IDFH_INT16_FS = 32768.0
+_IDFH_CHANNELS = ("Tran", "Vert", "Long", "MicL")
+
+
+# ─── Binary metadata extraction ─────────────────────────────────────────────
+
+
+@dataclass
+class IdfBinaryMetadata:
+    """Fields recoverable from the sig-A binary header (no .txt needed)."""
+    serial:           Optional[str] = None
+    event_datetime:   Optional[datetime.datetime] = None
+    sample_rate:      Optional[int] = None
+    record_time_sec:  Optional[float] = None
+    calibration_date: Optional[datetime.date] = None
+
+
+def _read_ascii_z(buf: bytes, off: int, maxlen: int = 64) -> Optional[str]:
+    if off >= len(buf):
+        return None
+    end = buf.find(b"\x00", off, off + maxlen)
+    if end < 0:
+        end = min(off + maxlen, len(buf))
+    s = buf[off:end].decode("ascii", errors="replace").strip()
+    return s or None
+
+
+def _decode_8byte_timestamp(buf: bytes, off: int) -> Optional[datetime.datetime]:
+    """Layout: ``[day][month][year_hi][year_lo][unknown][hour][min][sec]``."""
+    if off + 8 > len(buf):
+        return None
+    day, mon, yh, yl, _unk, hr, mn, sc = buf[off : off + 8]
+    year = (yh << 8) | yl
+    if not (2015 <= year <= 2050 and 1 <= mon <= 12 and 1 <= day <= 31
+            and 0 <= hr < 24 and 0 <= mn < 60 and 0 <= sc < 60):
+        return None
+    try:
+        return datetime.datetime(year, mon, day, hr, mn, sc)
+    except ValueError:
+        return None
+
+
+def extract_binary_metadata(buf: bytes) -> IdfBinaryMetadata:
+    """Pull serial/timestamp/sample_rate/record_time/calibration from the
+    sig-A binary header.
+
+    Field positions confirmed against UM11719_20231219162723.IDFW; stable
+    across the 151-file sig-A corpus.
    """
-    raise NotImplementedError(
-        "IDF binary codec not yet implemented; the .IDFW/.IDFH binary format "
-        "is undecoded.  Use parse_idf_report() on the paired .txt sidecar "
-        "for device-authoritative metadata."
+    md = IdfBinaryMetadata()
+
+    # Serial: null-terminated ASCII at 0x14E.
+    md.serial = _read_ascii_z(buf, 0x14E, maxlen=16)
+
+    # Sample rate + record time live in a BW-compatible compliance block.
+    # Locate the 6-byte anchor `be 80 00 00 00 00` and read offsets relative
+    # to it: anchor-6 = sample_rate uint16 BE; anchor+6 = record_time float32 BE.
+    anchor = buf.find(b"\xbe\x80\x00\x00\x00\x00", 0x800, 0xA00)
+    if anchor > 0:
+        sr_bytes = buf[anchor - 6 : anchor - 4]
+        if len(sr_bytes) == 2:
+            sr = int.from_bytes(sr_bytes, "big")
+            if sr in (256, 512, 1024, 2048, 4096):
+                md.sample_rate = sr
+        rt_bytes = buf[anchor + 6 : anchor + 10]
+        if len(rt_bytes) == 4:
+            try:
+                rt = struct.unpack(">f", rt_bytes)[0]
+                if 0.1 <= rt <= 600.0:
+                    md.record_time_sec = float(rt)
+            except struct.error:
+                pass
+
+    # Event timestamp: 8 bytes.  Position differs between IDFW (0x97A) and
+    # IDFH (0x9F8); scan a small range and accept the first valid decode.
+    for off in (0x97A, 0x9F8):
+        ts = _decode_8byte_timestamp(buf, off)
+        if ts is not None:
+            md.event_datetime = ts
+            break
+
+    # Calibration date: day, month, year_be at 0x194-0x197.
+    if len(buf) > 0x197:
+        day, mon = buf[0x194], buf[0x195]
+        year = int.from_bytes(buf[0x196 : 0x198], "big")
+        if 1 <= mon <= 12 and 1 <= day <= 31 and 2015 <= year <= 2050:
+            try:
+                md.calibration_date = datetime.date(year, mon, day)
+            except ValueError:
+                pass
+
+    return md
+
+
+# ─── Sample decoder + unit conversion ───────────────────────────────────────
+
+
+def _find_waveform_body_offset(buf: bytes) -> Optional[int]:
+    """Pick the file offset of the waveform body by trial-decoding every
+    ``00 02 00`` magic position past the fixed-header region.
+
+    The body's location isn't fixed across all sig-A IDFW files — about
+    half the production events use ``0x0f1f``, but the rest have offsets
+    that shift based on header padding / channel-config layout.  We
+    auto-detect by:
+
+      1. Find every ``00 02 00`` occurrence past ``_BODY_SCAN_FLOOR``.
+      2. Try ``decode_waveform_v2()`` on each candidate.
+      3. Pick the offset whose decoded sample count is largest.
+
+    Returns the offset, or ``None`` if no candidate yielded more than
+    the trivial 2-sample preamble (= "no real body found").
+
+    Costs ~2-8 trial decodes per file; in practice the first candidate
+    past 0x0e00 is usually the right one.
+    """
+    if len(buf) < _BODY_SCAN_FLOOR + 8:
+        return None
+    best: Optional[tuple[int, int]] = None   # (total_samples, offset)
+    i = _BODY_SCAN_FLOOR
+    while True:
+        j = buf.find(_BODY_MAGIC, i)
+        if j < 0:
+            break
+        i = j + 1
+        try:
+            decoded = decode_waveform_v2(buf[j:])
+        except Exception:
+            continue
+        if not decoded:
+            continue
+        total = sum(len(v) for v in decoded.values())
+        # A "real" body has more than just the 2-sample preamble.
+        if total <= 2:
+            continue
+        if best is None or total > best[0]:
+            best = (total, j)
+    return best[1] if best else None
+
+
+def _decode_waveform_samples(buf: bytes) -> Optional[dict]:
+    """Decode samples from the sig-A waveform body.
+
+    Returns the raw decoder counts dict — geo LSB = 0.0003 in/s, mic in
+    its own count unit (see :func:`mic_count_to_psi`).  Returns None if
+    no usable body is found.
+
+    Uses :func:`_find_waveform_body_offset` to locate the body — the
+    file-offset varies across events (~50% sit at the canonical
+    ``0x0f1f`` but the rest don't), so the previous hardcoded constant
+    silently produced 2-sample preamble-only output for half the corpus.
+    """
+    off = _find_waveform_body_offset(buf)
+    if off is None:
+        return None
+    return decode_waveform_v2(buf[off:])
+
+
+def geo_count_to_ips(count: int) -> float:
+    """Convert a Thor geo decoder count to in/s.  LSB = 0.0003 in/s."""
+    return count * _GEO_LSB_IPS
+
+
+def mic_count_to_psi(count: int) -> float:
+    """Convert a Thor mic decoder count to psi.  Scale derived from
+    regression over 50 sample pairs in UM11719_20231219162723.IDFW;
+    consistent to ~5%.  Calibration constants from the channel block
+    can refine this once decoded.
+    """
+    return count * _MIC_LSB_PSI
+
+
+# ─── IDFH histogram decoder ─────────────────────────────────────────────────
+
+
+@dataclass
+class IdfhInterval:
+    """One decoded histogram interval (typically one minute of monitoring)."""
+    offset:    int    # file byte offset of the 72-byte record
+    # Per-channel min/max ADC counts (int16 BE), half-period samples, peak count.
+    # Peak = max(|min|, |max|).  freq_hz = 512/halfp (None if halfp ≤ 5 →
+    # ">100 Hz" sentinel; matches sidecar convention).
+    tran_min:    int
+    tran_max:    int
+    tran_halfp:  int
+    vert_min:    int
+    vert_max:    int
+    vert_halfp:  int
+    long_min:    int
+    long_max:    int
+    long_halfp:  int
+    micl_min:    int
+    micl_max:    int
+    micl_halfp:  int
+
+    def peak_count(self, channel: str) -> int:
+        mn = getattr(self, f"{channel.lower()}_min")
+        mx = getattr(self, f"{channel.lower()}_max")
+        return max(abs(mn), abs(mx))
+
+    def peak_ips(self, channel: str) -> float:
+        """Convert peak count to in/s (geo channels only)."""
+        return self.peak_count(channel) / _IDFH_INT16_FS * _IDFH_GEO_FULL_SCALE
+
+    def freq_hz(self, channel: str) -> Optional[float]:
+        halfp = getattr(self, f"{channel.lower()}_halfp")
+        if halfp <= 5:
+            return None
+        return _IDFH_HALFP_FREQ_NUM / halfp
+
+
+def _decode_idfh_interval(buf72: bytes, offset: int) -> IdfhInterval:
+    """Decode one 72-byte interval record into per-channel min/max/halfp."""
+    import struct
+    fields = []
+    for i in range(4):
+        block = buf72[i * 16 : (i + 1) * 16]
+        mn = struct.unpack_from(">h", block, 0)[0]
+        mx = struct.unpack_from(">h", block, 2)[0]
+        # block[4:6] = int16 BE, role unknown (possibly time-of-peak)
+        halfp = struct.unpack_from(">H", block, 6)[0]
+        # block[10:12] and block[14:16] are uint16 BE with unknown semantics
+        # (likely sum / count contributions for the PVS computation).
+        fields.extend([mn, mx, halfp])
+    # Tail 8 bytes (buf72[64:72]) carry PVS-related data; not yet decoded.
+    return IdfhInterval(
+        offset=offset,
+        tran_min=fields[0], tran_max=fields[1], tran_halfp=fields[2],
+        vert_min=fields[3], vert_max=fields[4], vert_halfp=fields[5],
+        long_min=fields[6], long_max=fields[7], long_halfp=fields[8],
+        micl_min=fields[9], micl_max=fields[10], micl_halfp=fields[11],
+    )
+
+
+def decode_idfh_body(buf: bytes) -> list:
+    """Walk an IDFH file and decode every interval record.
+
+    The body has one or more segments; each segment header is 12 bytes:
+    ``[length_be 2B][0a 00 00 00][00 NN_counter][05 3f]`` where ``length``
+    is bytes from the magic through the end of the interval block
+    (= 10 + 72 × n_intervals).  Segments are separated by a 2-byte tail
+    + next-segment 2-byte prefix (the bytes before the next length field).
+    Confirmed against the 859-file corpus (181,071 intervals decoded; 1
+    failure is the sig-B BE9439 file).
+    """
+    intervals: list = []
+    i = 0
+    while True:
+        j = buf.find(b"\x0a\x00\x00\x00", i)
+        if j < 0 or j < 2:
+            break
+        # Validate: [length_be][0a 00 00 00][00 NN][05 3f]
+        if buf[j + 4] != 0x00 or buf[j + 6 : j + 8] != b"\x05\x3f":
+            i = j + 1
+            continue
+        length = int.from_bytes(buf[j - 2 : j], "big")
+        n = (length - _IDFH_SEGMENT_HEADER) // _IDFH_INTERVAL_SIZE
+        if n <= 0:
+            i = j + 1
+            continue
+        header_start = j - 2
+        interval_start = header_start + _IDFH_SEGMENT_HEADER
+        for k in range(n):
+            off = interval_start + k * _IDFH_INTERVAL_SIZE
+            if off + _IDFH_INTERVAL_SIZE > len(buf):
+                break
+            chunk = buf[off : off + _IDFH_INTERVAL_SIZE]
+            intervals.append(_decode_idfh_interval(chunk, off))
+        # Advance past this segment + the 2-byte tail.
+        i = header_start + length + _IDFH_SEGMENT_TAIL
+    return intervals
+
+
+# ─── Top-level reader ───────────────────────────────────────────────────────
+
+
+@dataclass
+class IdfReadResult:
+    """Return type for :func:`read_idf_file`.
+
+    For waveforms (``.IDFW``), ``samples`` holds the per-channel sample
+    arrays in Thor decoder counts.  For histograms (``.IDFH``),
+    ``samples`` is empty and ``intervals`` holds the per-interval
+    record list (peaks, freqs).
+    """
+    event:           IdfEvent
+    samples:         dict   # {"Tran": [...], ...} for IDFW; empty for IDFH
+    binary_metadata: IdfBinaryMetadata
+    signature:       str    # always "thor" for now (sig-A genuine Thor)
+    intervals:       Optional[list] = None  # list[IdfhInterval] for IDFH; None for IDFW
+
+
+def read_idf_file(
+    path: Union[str, Path],
+    *,
+    data: Optional[bytes] = None,
+) -> IdfReadResult:
+    """Parse a Thor ``.IDFW`` binary into an ``IdfEvent`` + decoded samples.
+
+    Currently implements signature-A waveforms only.  Signature-B
+    (old-firmware) and ``.IDFH`` histograms raise NotImplementedError;
+    use the paired ``.IDFW.txt`` / ``.IDFH.txt`` sidecar for those via
+    ``parse_idf_report()``.
+
+    Returns an :class:`IdfReadResult`.  The caller converts int sample
+    counts to physical units via :func:`geo_count_to_ips` /
+    :func:`mic_count_to_psi`.
+
+    ``path`` is used for filename in error messages and ``.IDFH`` vs
+    ``.IDFW`` suffix detection.  When ``data`` is supplied the disk
+    read is skipped — useful for ingest paths that already have the
+    bytes in memory and where the file may not exist on disk yet.
+    """
+    p = Path(path)
+    buf = data if data is not None else p.read_bytes()
+
+    if len(buf) < 16 or buf[6:16] != _INSTANTEL_TAG + b"\x00":
+        raise ValueError(f"{p.name}: not an IDF file (missing Instantel magic)")
+
+    sig_prefix = buf[:6]
+    if sig_prefix == _THOR_PREFIX:
+        signature = "thor"
+    elif sig_prefix == _BW_STRAY_PREFIX:
+        raise NotImplementedError(
+            f"{p.name}: file has a Series III (Blastware) STRT header in "
+            "an IDF-named container — not a Thor binary.  Route through "
+            "minimateplus.event_file_io.read_blastware_file() instead "
+            "(peaks decode; samples & full metadata don't, but it's not "
+            "Thor data so the Thor codec doesn't apply)."
+        )
+    else:
+        raise ValueError(f"{p.name}: unknown IDF signature {sig_prefix.hex()}")
+
+    is_histogram = p.suffix.upper() == ".IDFH"
+    md = extract_binary_metadata(buf)
+
+    if is_histogram:
+        intervals = decode_idfh_body(buf)
+        if not intervals:
+            raise ValueError(f"{p.name}: IDFH body decoded no intervals")
+        # Peaks: max across all intervals on each channel (per-channel max
+        # of stored max-magnitudes; sidecar's PPV row carries the same).
+        peak_tran = max((iv.peak_ips("Tran") for iv in intervals), default=0.0)
+        peak_vert = max((iv.peak_ips("Vert") for iv in intervals), default=0.0)
+        peak_long = max((iv.peak_ips("Long") for iv in intervals), default=0.0)
+        # Mic peak in psi — Thor stores per-interval mic ADC counts in the
+        # binary; convert the max count to psi via the per-count factor.
+        mic_peak_count = max((iv.peak_count("MicL") for iv in intervals), default=0)
+        mic_peak_psi = mic_count_to_psi(mic_peak_count) if mic_peak_count else None
+        rep = IdfReport(
+            serial_number=md.serial,
+            event_type="Full Histogram",
+            event_datetime=md.event_datetime,
+            filename=p.name,
+            sample_rate=md.sample_rate,
+            record_time_sec=md.record_time_sec,
+        )
+        peaks = IdfPeaks(
+            transverse_ips=peak_tran,
+            vertical_ips=peak_vert,
+            longitudinal_ips=peak_long,
+            peak_vector_sum_ips=None,
+            mic_pspl_dbl=None,         # IDFH binary doesn't carry the dB(L) value
+            mic_pspl_psi=mic_peak_psi,
+        )
+        event = IdfEvent(
+            serial=md.serial or "UNKNOWN",
+            timestamp=md.event_datetime or datetime.datetime(1970, 1, 1),
+            kind="Histogram",
+            filename=p.name,
+            sample_rate=md.sample_rate,
+            record_time_sec=md.record_time_sec,
+            peaks=peaks,
+            report=rep,
+        )
+        return IdfReadResult(
+            event=event,
+            samples={},
+            binary_metadata=md,
+            signature=signature,
+            intervals=intervals,
+        )
+
+    # Waveform path.
+    decoded = _decode_waveform_samples(buf)
+    if decoded is None:
+        raise ValueError(f"{p.name}: waveform body codec failed")
+
+    rep = IdfReport(
+        serial_number=md.serial,
+        event_type="Full Waveform",
+        event_datetime=md.event_datetime,
+        filename=p.name,
+        sample_rate=md.sample_rate,
+        record_time_sec=md.record_time_sec,
+    )
+
+    def _peak_ips(ch: str) -> float:
+        arr = decoded.get(ch, [])
+        return geo_count_to_ips(max((abs(v) for v in arr), default=0))
+
+    # Mic peak psi from binary: max absolute MicL ADC count × 2.14e-6 psi/count.
+    mic_arr = decoded.get("MicL", [])
+    mic_peak_count = max((abs(v) for v in mic_arr), default=0)
+    mic_peak_psi = mic_count_to_psi(mic_peak_count) if mic_peak_count else None
+
+    peaks = IdfPeaks(
+        transverse_ips=_peak_ips("Tran"),
+        vertical_ips=_peak_ips("Vert"),
+        longitudinal_ips=_peak_ips("Long"),
+        # PVS requires aligned per-sample √(T²+V²+L²); leave None — the
+        # sidecar carries it and the bridge picks it up if present.
+        peak_vector_sum_ips=None,
+        mic_pspl_dbl=None,             # binary IDFW doesn't carry the dB(L) value;
+                                       # sidecar .txt fills it via IdfReport.from_dict
+        mic_pspl_psi=mic_peak_psi,
+    )
+
+    event = IdfEvent(
+        serial=md.serial or "UNKNOWN",
+        timestamp=md.event_datetime or datetime.datetime(1970, 1, 1),
+        kind="Waveform",
+        filename=p.name,
+        sample_rate=md.sample_rate,
+        record_time_sec=md.record_time_sec,
+        peaks=peaks,
+        report=rep,
+    )
+
+    return IdfReadResult(
+        event=event,
+        samples=decoded,
+        binary_metadata=md,
+        signature=signature,
    )
@@ -0,0 +1,323 @@
+"""
+micromate/idf_to_bw_report.py — adapter that projects a parsed Thor IDF
+report (+ binary metadata + decoded IDFH intervals) into the
+``bw_report``-shaped dict that :mod:`sfm.report_pdf.gather_report_data`
+consumes.
+
+Lets Thor events flow through the existing Series III Event Report PDF
+pipeline without duplicating the renderer.  Thor's report content is
+~95% the same data shape as BW's; the field names differ but the
+underlying metrics map 1:1.
+
+Caveats
+───────
+
+- **Mic units** — Thor records ``MicPSPL`` natively in dB(L).  This
+  adapter sets ``bw_report.mic.pspl_dbl`` directly; the report
+  renderer recomputes the equivalent psi via its dBL→psi formula.
+- **Saturation / above-range flags** — Thor doesn't always mark
+  ``OORANGE`` the way BW does; we set ``zc_freq_above_range`` only
+  when a `>100` sentinel was preserved in the raw text.
+- **Per-interval data** — for IDFH events we build ``interval_times``
+  by stepping ``IntervalSize`` from ``HistogramStartTime``; the binary
+  decoder confirms one record per step (882 / 881 / 881 ... across
+  the corpus).
+- **calibration_by parsing** — Thor's free-form ``Calibration : November
+  22, 2023 by Instantel`` is split on ``" by "`` to extract the
+  calibrator; the date prefix is parsed where possible, otherwise
+  the binary-extracted ``calibration_date`` from
+  :class:`micromate.idf_file.IdfBinaryMetadata` wins.
+"""
+
+from __future__ import annotations
+
+import datetime
+import re
+from typing import Any, Dict, List, Optional
+
+
+# ─── Helpers ────────────────────────────────────────────────────────────────
+
+
+_NUM_RE = re.compile(r"-?\d+(?:\.\d+)?")
+
+
+def _parse_first_number(s: Optional[str]) -> Optional[float]:
+    """Pull the first numeric token from a string like ``"0.1500 in/s"``."""
+    if s is None:
+        return None
+    m = _NUM_RE.search(str(s))
+    if not m:
+        return None
+    try:
+        return float(m.group(0))
+    except ValueError:
+        return None
+
+
+def _parse_interval_size_s(s: Optional[str]) -> Optional[float]:
+    """``"60 sec"`` → 60.0, ``"5 min"`` → 300.0, ``"1 hour"`` → 3600."""
+    if s is None:
+        return None
+    num = _parse_first_number(s)
+    if num is None:
+        return None
+    sl = str(s).lower()
+    if "hour" in sl or "hr" in sl:
+        return num * 3600.0
+    if "min" in sl:
+        return num * 60.0
+    return num   # default to seconds
+
+
+def _parse_calibration(text: Optional[str]) -> tuple[Optional[str], Optional[str]]:
+    """Split ``"November 22, 2023 by Instantel"`` → (ISO date, calibrator).
+
+    Returns ``(None, None)`` if neither half parses.
+    """
+    if not text:
+        return None, None
+    parts = str(text).split(" by ", 1)
+    date_part = parts[0].strip() if parts else None
+    by_part = parts[1].strip() if len(parts) > 1 else None
+    iso_date: Optional[str] = None
+    if date_part:
+        for fmt in ("%B %d, %Y", "%b %d, %Y", "%Y-%m-%d", "%m/%d/%Y"):
+            try:
+                iso_date = datetime.datetime.strptime(date_part, fmt).date().isoformat()
+                break
+            except ValueError:
+                continue
+    return iso_date, by_part
+
+
+def _channel_peaks(idf: Dict[str, Any], ch_lc: str) -> Dict[str, Any]:
+    """Map ``tran_ppv`` / ``tran_zc_freq`` / ... → bw_report.peaks.tran shape."""
+    out: Dict[str, Any] = {}
+    for src, dst in (
+        (f"{ch_lc}_ppv",                 "ppv_ips"),
+        (f"{ch_lc}_zc_freq",             "zc_freq_hz"),
+        (f"{ch_lc}_time_of_peak",        "time_of_peak_s"),
+        (f"{ch_lc}_peak_acceleration",   "peak_accel_g"),
+        (f"{ch_lc}_peak_displacement",   "peak_disp_in"),
+    ):
+        v = idf.get(src)
+        if v is not None:
+            out[dst] = v
+    # ZC freq ">100" sentinel: the raw text carries it under the un-typed
+    # key (e.g. ``raw["tran_zc_freq"]`` would be ``">100"``), and our parser
+    # dropped the typed entry.  Detect that case and flag.
+    raw_zc = idf.get(f"{ch_lc}_zc_freq")
+    if isinstance(raw_zc, str) and ">" in raw_zc:
+        out["zc_freq_above_range"] = True
+        out.pop("zc_freq_hz", None)
+    return out
+
+
+def _sensor_check(idf: Dict[str, Any], ch_lc: str) -> Dict[str, Any]:
+    out: Dict[str, Any] = {}
+    fr = idf.get(f"{ch_lc}_test_freq")
+    if fr is not None:
+        out["freq_hz"] = _parse_first_number(fr)
+    rt = idf.get(f"{ch_lc}_test_ratio")
+    if rt is not None:
+        out["ratio"] = _parse_first_number(rt)
+    am = idf.get(f"{ch_lc}_test_amplitude")
+    if am is not None:
+        out["amplitude_mv"] = _parse_first_number(am)
+    res = idf.get(f"{ch_lc}_test_results")
+    if res is not None:
+        out["result"] = str(res).strip()
+    return {k: v for k, v in out.items() if v is not None}
+
+
+def _interval_times(idf: Dict[str, Any], n_intervals: Optional[int]) -> List[str]:
+    """Synthesise per-interval timestamps from start + interval_size × k.
+
+    Returns ``[]`` when start time or interval size is unknown.
+    """
+    if not n_intervals:
+        return []
+    start_date = idf.get("histogram_start_date") or idf.get("event_date")
+    start_time = idf.get("histogram_start_time") or idf.get("event_time")
+    iv_str = idf.get("interval_size")
+    iv_s = _parse_interval_size_s(iv_str)
+    if not (start_date and start_time and iv_s):
+        return []
+    try:
+        t0 = datetime.datetime.strptime(f"{start_date} {start_time}", "%Y-%m-%d %H:%M:%S")
+    except ValueError:
+        return []
+    out = []
+    for k in range(int(n_intervals)):
+        t = t0 + datetime.timedelta(seconds=iv_s * (k + 1))
+        out.append(t.isoformat())
+    return out
+
+
+# ─── Top-level adapter ──────────────────────────────────────────────────────
+
+
+def build_bw_report_from_idf(
+    idf_report: Dict[str, Any],
+    *,
+    binary_md=None,
+    intervals: Optional[list] = None,
+    is_histogram: Optional[bool] = None,
+) -> Dict[str, Any]:
+    """Project a parsed IDF report dict (and optional binary metadata +
+    decoded IDFH intervals) into the BW report sidecar shape.
+
+    The returned dict is structurally identical to what
+    ``minimateplus.event_file_io._bw_report_to_dict`` produces from a
+    real BW ASCII report — it can be assigned to
+    ``sidecar["bw_report"]`` and consumed verbatim by
+    ``sfm.report_pdf.gather_report_data``.
+
+    ``intervals`` is the list of :class:`micromate.idf_file.IdfhInterval`
+    objects from :func:`micromate.idf_file.decode_idfh_body`; only used
+    for histogram events to derive accurate ``interval_times``.
+    """
+    if is_histogram is None:
+        et = str(idf_report.get("event_type", ""))
+        is_histogram = et.lower().startswith("full histogram")
+
+    # ── Trigger / recording / device ─────────────────────────────────────
+    trigger_channel = idf_report.get("trigger")
+    trigger_level   = _parse_first_number(idf_report.get("geo_trigger_level"))
+    geo_range_ips   = _parse_first_number(idf_report.get("geo_range"))
+
+    cal_iso, cal_by = _parse_calibration(idf_report.get("calibration"))
+    # Prefer the binary-extracted calibration_date when our text parse fell
+    # through; the binary date is unambiguous.
+    if cal_iso is None and binary_md is not None and binary_md.calibration_date:
+        cal_iso = binary_md.calibration_date.isoformat()
+
+    # ── Histogram fields ────────────────────────────────────────────────
+    hist_block: Dict[str, Any] = {
+        "start": None, "stop": None, "n_intervals": None,
+        "interval_size": None, "interval_size_s": None,
+        "channel_peak_when": {},
+    }
+    if is_histogram:
+        sd = idf_report.get("histogram_start_date")
+        st = idf_report.get("histogram_start_time")
+        if sd and st:
+            try:
+                hist_block["start"] = datetime.datetime.strptime(
+                    f"{sd} {st}", "%Y-%m-%d %H:%M:%S"
+                ).isoformat()
+            except ValueError:
+                pass
+        ed = idf_report.get("histogram_stop_date")
+        et_ = idf_report.get("histogram_stop_time")
+        if ed and et_:
+            try:
+                hist_block["stop"] = datetime.datetime.strptime(
+                    f"{ed} {et_}", "%Y-%m-%d %H:%M:%S"
+                ).isoformat()
+            except ValueError:
+                pass
+        n_raw = idf_report.get("number_of_intervals")
+        if n_raw is not None:
+            try:
+                # Thor reports a float like "81.04"; round to int (the BW
+                # report uses an int for the column).
+                hist_block["n_intervals"] = int(float(str(n_raw)))
+            except ValueError:
+                pass
+        # When the binary decoder gave us the actual interval count, prefer it.
+        if intervals is not None:
+            hist_block["n_intervals"] = len(intervals)
+        hist_block["interval_size"] = idf_report.get("interval_size")
+        hist_block["interval_size_s"] = _parse_interval_size_s(idf_report.get("interval_size"))
+        # interval_times derived from start+step (the BW report uses the
+        # exact strings; we match its representation).
+        times = _interval_times(idf_report, hist_block["n_intervals"])
+        # Per-channel peak when (absolute date+time at which the channel's
+        # peak occurred over the histogram run).  Thor splits this into
+        # ``TranPeakDate`` / ``TranPeakTime`` etc.
+        peak_when: Dict[str, str] = {}
+        for ch_label, ch_lc in (("Tran", "tran"), ("Vert", "vert"), ("Long", "long"), ("MicL", "mic")):
+            d = idf_report.get(f"{ch_lc}_peak_date")
+            t = idf_report.get(f"{ch_lc}_peak_time")
+            if d and t:
+                try:
+                    peak_when[ch_label] = datetime.datetime.strptime(
+                        f"{d} {t}", "%Y-%m-%d %H:%M:%S"
+                    ).isoformat()
+                except ValueError:
+                    continue
+        if peak_when:
+            hist_block["channel_peak_when"] = peak_when
+
+    # ── Mic block ────────────────────────────────────────────────────────
+    mic_block = {
+        "weighting":           "L",                   # Thor mic is ISEE Linear
+        "pspl_dbl":            idf_report.get("mic_ppv"),  # the dB(L) float
+        "pspl_saturated":      False,
+        "zc_freq_hz":          idf_report.get("mic_zc_freq"),
+        "zc_freq_above_range": isinstance(idf_report.get("mic_zc_freq"), str)
+                               and ">" in str(idf_report.get("mic_zc_freq")),
+        "time_of_peak_s":      idf_report.get("mic_time_of_peak"),
+    }
+    if mic_block["zc_freq_above_range"]:
+        mic_block["zc_freq_hz"] = None
+
+    # ── Peaks ────────────────────────────────────────────────────────────
+    vs_block = {
+        "ips":       idf_report.get("peak_vector_sum"),
+        "time_s":    _parse_first_number(idf_report.get("peak_vector_sum_time_sum")),
+        "when":      None,
+        "saturated": False,
+    }
+    if is_histogram:
+        # PVS absolute date+time, when present.
+        vs_d = idf_report.get("peak_vector_sum_date")
+        vs_t = idf_report.get("peak_vector_sum_time")
+        if vs_d and vs_t:
+            try:
+                vs_block["when"] = datetime.datetime.strptime(
+                    f"{vs_d} {vs_t}", "%Y-%m-%d %H:%M:%S"
+                ).isoformat()
+            except ValueError:
+                pass
+
+    return {
+        "available":  True,
+        "event_type": idf_report.get("event_type"),
+        "version":    idf_report.get("version"),
+        "trigger": {
+            "channel":       trigger_channel,
+            "geo_level_ips": trigger_level,
+        },
+        "recording": {
+            "sample_rate_sps":  idf_report.get("sample_rate"),
+            "record_time_s":    idf_report.get("record_time_sec"),
+            "pretrig_s":        idf_report.get("pre_trigger_sec"),
+            "stop_mode":        idf_report.get("record_stop_mode"),
+            "geo_range_ips":    geo_range_ips,
+            "units":            idf_report.get("units"),
+        },
+        "device": {
+            "battery_volts":    idf_report.get("battery_volts"),
+            "calibration_date": cal_iso,
+            "calibration_by":   cal_by,
+        },
+        "peaks": {
+            "tran":       _channel_peaks(idf_report, "tran"),
+            "vert":       _channel_peaks(idf_report, "vert"),
+            "long":       _channel_peaks(idf_report, "long"),
+            "vector_sum": vs_block,
+        },
+        "mic":          mic_block,
+        "sensor_check": {
+            "tran": _sensor_check(idf_report, "tran"),
+            "vert": _sensor_check(idf_report, "vert"),
+            "long": _sensor_check(idf_report, "long"),
+            "mic":  _sensor_check(idf_report, "mic"),
+        },
+        "histogram":    hist_block,
+        "monitor_log":  [],
+        "pc_sw_version": None,
+    }
@@ -159,12 +159,23 @@ class IdfReport:

@dataclass
 class IdfPeaks:
-    """Geophone + mic peak values for one Thor event.  Native Thor units."""
+    """Geophone + mic peak values for one Thor event.  Native Thor units.
+
+    Thor stores the mic peak in two parallel forms — ``mic_pspl_dbl`` is
+    what the sidecar's top-level ``MicPSPL`` header field carries (dB(L)),
+    used in the report header.  ``mic_pspl_psi`` is the psi value derived
+    either from the IDFW sample table / IDFH interval column 9, or from
+    the binary mic counts (~2.14e-6 psi/count).  Needed because the
+    BW-shaped ``PeakValues.micl`` consumed by ``event_hdf5.write_event_hdf5``
+    expects psi — feeding it dB(L) makes the h5 mic-chart scale factor
+    blow up.
+    """
    transverse_ips:    Optional[float] = None    # in/s
    vertical_ips:      Optional[float] = None    # in/s
    longitudinal_ips:  Optional[float] = None    # in/s
    peak_vector_sum_ips: Optional[float] = None  # in/s
    mic_pspl_dbl:      Optional[float] = None    # dB(L)
+    mic_pspl_psi:      Optional[float] = None    # psi


@dataclass
@@ -324,10 +335,14 @@ class IdfEvent:
        machinery without those code paths needing to know about Thor.

        Caveats of the bridge:
-          - ``mic_ppv`` on the produced Event carries Thor's dB(L) value
-            verbatim — the UI distinguishes via the ``device_family``
-            column (Phase 1).  Don't run the BW psi→dBL converter on
-            Series IV rows.
+          - ``PeakValues.micl`` carries the mic peak in **psi** (matching
+            BW's convention) — set from :attr:`IdfPeaks.mic_pspl_psi`,
+            with a dB(L)→psi fallback when only the dB(L) value is
+            available.  This is what the h5 writer's mic-scale-factor
+            logic needs.  The dB(L) value still flows through
+            ``bw_report.mic.pspl_dbl`` (set by the
+            ``idf_to_bw_report`` adapter) and the renderer reads it
+            from there for the report header.
          - Many Thor-specific fields (Peak Acceleration / Displacement,
            sensor self-check, calibration) don't have a slot in
            ``Event``.  The full IdfReport is preserved on the
@@ -349,11 +364,17 @@ class IdfEvent:
            minute=self.timestamp.minute,
            second=self.timestamp.second,
        )
+        # Resolve mic peak as psi.  Priority: binary-derived mic_pspl_psi
+        # (set by read_idf_file) > dB(L)→psi fallback via standard formula
+        # (psi = 2.9e-9 × 10^(dBL/20)) > None.
+        mic_psi = self.peaks.mic_pspl_psi
+        if mic_psi is None and self.peaks.mic_pspl_dbl is not None:
+            mic_psi = 2.9e-9 * (10.0 ** (self.peaks.mic_pspl_dbl / 20.0))
        pv = PeakValues(
            tran=self.peaks.transverse_ips,
            vert=self.peaks.vertical_ips,
            long=self.peaks.longitudinal_ips,
-            micl=self.peaks.mic_pspl_dbl,   # dB(L) — see caveat above
+            micl=mic_psi,   # psi, matching BW's convention (h5 scaling depends on this)
            peak_vector_sum=self.peaks.peak_vector_sum_ips,
        )
        pi = ProjectInfo(
@@ -67,6 +67,11 @@ class ChannelStats:
    # to render "> 10 in/s" or "saturated" instead of trusting the
    # value as an exact measurement.
    ppv_saturated:     bool = False
+    # Set when BW writes ">100 Hz" for ZC Freq — the zero-crossing
+    # algorithm's peak frequency exceeded the device's reporting
+    # ceiling (typically 100 Hz on V10.72).  zc_freq_hz gets the
+    # threshold (100.0) as a lower bound; downstream UI renders ">100".
+    zc_freq_above_range: bool = False


@dataclass
@@ -81,6 +86,9 @@ class MicStats:
    # 140 dBL (typical NL-43 max; some units cap at 148).  Consumers
    # should render "> 140 dB(L)" or similar when this flag is set.
    pspl_saturated:    bool = False
+    # Same semantics as ChannelStats.zc_freq_above_range — mic ZC
+    # peak exceeded device reporting ceiling.
+    zc_freq_above_range: bool = False


@dataclass
@@ -119,6 +127,20 @@ def _is_oorange(value: str) -> bool:
    return any(m in s for m in _OORANGE_MARKERS)


+def _parse_above_range(value: str) -> Optional[float]:
+    """For BW "above-range" markers like ">100 Hz", return the threshold.
+
+    BW writes ZC Freq as ">100 Hz" when the zero-crossing algorithm sees
+    a peak too fast to count (device cuts off at 100 Hz).  Returns the
+    numeric portion after the '>' (e.g. 100.0), or None if `value` is
+    not an above-range marker.
+    """
+    s = value.strip()
+    if not s.startswith(">"):
+        return None
+    return _parse_number(s[1:])
+
+
@dataclass
 class BwAsciiReport:
    """Structured representation of one BW per-event ASCII export."""
@@ -527,10 +549,17 @@ def parse_report(text: Union[str, bytes], *, parse_samples: bool = False) -> BwA
                    cs.ppv_saturated = True
                else:
                    cs.ppv_ips = _parse_number(value)
+            elif stat == "ZC Freq":
+                # ">100 Hz" → store threshold + flag; numeric → parse normally
+                threshold = _parse_above_range(value)
+                if threshold is not None:
+                    cs.zc_freq_hz = threshold
+                    cs.zc_freq_above_range = True
+                else:
+                    cs.zc_freq_hz = _parse_number(value)
            else:
                num = _parse_number(value)
-                if   stat == "ZC Freq":             cs.zc_freq_hz     = num
-                elif stat == "Time of Peak":        cs.time_of_peak_s = num
+                if   stat == "Time of Peak":        cs.time_of_peak_s = num
                elif stat == "Peak Acceleration":   cs.peak_accel_g   = num
                elif stat == "Peak Displacement":   cs.peak_disp_in   = num

@@ -627,9 +656,15 @@ def parse_report(text: Union[str, bytes], *, parse_samples: bool = False) -> BwA
            cs = report.channels.setdefault("MicL", ChannelStats())
            cs.time_of_peak_s = report.mic.time_of_peak_s
        elif key == "MicL ZC Freq":
+            threshold = _parse_above_range(value)
+            if threshold is not None:
+                report.mic.zc_freq_hz         = threshold
+                report.mic.zc_freq_above_range = True
+            else:
                report.mic.zc_freq_hz = _parse_number(value)
            cs = report.channels.setdefault("MicL", ChannelStats())
            cs.zc_freq_hz          = report.mic.zc_freq_hz
+            cs.zc_freq_above_range = report.mic.zc_freq_above_range

        # ── Sensor self-check ────────────────────────────────────────────────
        elif key in (
@@ -49,7 +49,7 @@ SIDECAR_KIND   = "sfm.event"
 # bumped without a `pip install` re-run — leading to confusing stale
 # version stamps in sidecars.  Bump this constant and CHANGELOG.md
 # together at release time.
-TOOL_VERSION = "0.20.0"
+TOOL_VERSION = "0.21.1"

 try:
    # Best-effort: prefer the installed metadata when it's NEWER than the
@@ -125,6 +125,10 @@ def _bw_report_to_dict(report: BwAsciiReport) -> dict:
        # is the channel range max (a lower bound), not an exact reading.
        if getattr(cs, "ppv_saturated", False):
            out["ppv_saturated"] = True
+        # ZC Freq above device reporting ceiling (BW ">100 Hz") — value
+        # in zc_freq_hz is the threshold, not an exact measurement.
+        if getattr(cs, "zc_freq_above_range", False):
+            out["zc_freq_above_range"] = True
        return out

    def _sc(ch_name: str) -> dict:
@@ -191,6 +195,7 @@ def _bw_report_to_dict(report: BwAsciiReport) -> dict:
            "pspl_dbl":              report.mic.pspl_dbl,
            "pspl_saturated":        bool(getattr(report.mic, "pspl_saturated", False)),
            "zc_freq_hz":            report.mic.zc_freq_hz,
+            "zc_freq_above_range":   bool(getattr(report.mic, "zc_freq_above_range", False)),
            "time_of_peak_s":        report.mic.time_of_peak_s,
        },
        "sensor_check": {
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"

 [project]
 name = "seismo-relay"
-version = "0.19.0"
+version = "0.21.1"
 description = "Python client and REST server for MiniMate Plus seismographs"
 requires-python = ">=3.10"
 dependencies = [
@@ -103,6 +103,17 @@ def main(argv=None) -> int:
            "STRT-rectime byte-offset fix in v0.15.x)."
        ),
    )
+    p.add_argument(
+        "--reparse-txt", action="store_true",
+        help=(
+            "Re-parse the preserved <serial>/<filename>_ASCII.TXT with the "
+            "current bw_ascii_report parser and overwrite the sidecar's "
+            "bw_report block.  Use this after upgrading the ASCII parser to "
+            "pull in new fields (e.g. zc_freq_above_range for BW '>100 Hz' "
+            "ZC peaks).  No-op for events without a preserved .TXT; safely "
+            "idempotent when the parser hasn't changed."
+        ),
+    )
    p.add_argument("-v", "--verbose", action="store_true")
    args = p.parse_args(argv)

@@ -153,7 +164,7 @@ def main(argv=None) -> int:
            # of the sidecar implies staleness of the derived .h5 (both
            # come out of the same decoder).
            sidecar_stale = True
-            if sidecar_path.exists() and not args.force:
+            if sidecar_path.exists() and not args.force and not args.reparse_txt:
                try:
                    existing = event_file_io.read_sidecar(sidecar_path)
                    sha_ok = existing.get("blastware", {}).get("sha256") == bw_sha
@@ -314,6 +325,24 @@ def main(argv=None) -> int:
                    except Exception:
                        pass

+                # --reparse-txt: if a .TXT is preserved on disk, run the
+                # current parser against it and overwrite the bw_report
+                # block.  Picks up post-ingest parser fixes (e.g. the
+                # 2026-05-28 zc_freq_above_range / ">100 Hz" addition).
+                if args.reparse_txt and preserved_txt_fn:
+                    try:
+                        from minimateplus import bw_ascii_report
+                        txt_path = store.txt_path_for(serial, path.name)
+                        if txt_path.exists():
+                            refreshed = bw_ascii_report.parse_report_file(txt_path)
+                            preserved_bw_report = event_file_io._bw_report_to_dict(refreshed)
+                            log.debug("reparsed bw_report from %s", txt_path.name)
+                        else:
+                            log.debug("--reparse-txt: no .TXT at %s (sidecar says %r)",
+                                      txt_path, preserved_txt_fn)
+                    except Exception as exc:
+                        log.warning("--reparse-txt failed for %s: %s", path.name, exc)
+
                # Overlay BW ASCII report fields onto the rebuilt Event
                # BEFORE the sidecar + DB write.  Mirrors what the ingest
                # path does — BW's reported peaks (and sample_rate /
@@ -0,0 +1,331 @@
+"""
+scripts/backfill_thor_events.py — re-process existing Thor (Series IV)
+events so their sidecars carry the bw_report block produced by
+``micromate.idf_to_bw_report.build_bw_report_from_idf`` + their .h5
+clean-waveform files for IDFW events.
+
+Why this exists
+───────────────
+
+Thor events ingested before v0.21.0 (or during the v0.21.0 ingest bug
+window fixed in commit bee1185) have sidecars with only
+``extensions.idf_report`` — no ``bw_report`` block.  Without
+``bw_report``, the SFM PDF renderer falls back to DB-only fields
+(misses sensor-self-check, full per-channel breakdown, mic dB(L)),
+and the modal chart 404s on ``/waveform.json`` for IDFW events
+because no .h5 was written when the codec failed at ingest.
+
+Re-forwarding from thor-watcher would also fix this, but that requires
+operator coordination on every watcher machine and uses bandwidth this
+script doesn't.
+
+What this does
+──────────────
+
+Walks ``<store>/<serial>/<filename>`` for ``.IDFW`` / ``.IDFH`` files
+and, for each one:
+
+  1. Reads the existing sidecar (preserving review state + captured_at).
+  2. Re-runs ``micromate.idf_file.read_idf_file()`` on the binary
+     bytes — passing ``data=`` so the codec doesn't try to read from
+     a path it doesn't know.
+  3. Pulls ``extensions.idf_report`` (the raw parsed Thor dict the
+     v0.18.0+ ingest path already stashed) and runs the v0.21.0
+     ``build_bw_report_from_idf`` adapter against it.
+  4. Writes the refreshed sidecar with the new ``bw_report``,
+     bumped ``source.tool_version``, but preserved ``review`` block
+     + the original ``captured_at`` timestamp.
+  5. Regenerates the .h5 waveform file via the existing
+     ``event_hdf5`` writer.  For IDFW that's the decoded per-sample
+     stream; for IDFH it's a 1-sample-per-interval synthesised array
+     (peak ADC count per channel) so the renderer's bar-chart code
+     has data to group on.  Mic peak psi from the binary is merged
+     onto the IdfEvent before the bridge so the h5 writer's per-count
+     mic scale factor lands on a sensible value (without this the
+     mic chart on Thor events plots dB(L)-as-pseudo-psi and shows
+     bomb-level numbers).
+
+Idempotent.  Re-running it after a parser/adapter change just
+re-writes sidecars — no DB writes, no thor-watcher coordination.
+
+Usage
+─────
+
+    python scripts/backfill_thor_events.py [--store-root PATH]
+                                           [--dry-run]
+                                           [--skip-hdf5]
+                                           [--force]
+                                           [-v]
+
+By default, refreshes any Thor event whose sidecar is missing
+``bw_report`` OR whose ``source.tool_version`` is older than the
+current ``TOOL_VERSION``.  ``--force`` refreshes every Thor event
+regardless.
+"""
+
+from __future__ import annotations
+
+import argparse
+import logging
+import sys
+from pathlib import Path
+
+# Allow running from the repo root without installation.
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from minimateplus import event_file_io
+from sfm.waveform_store import WaveformStore
+
+log = logging.getLogger("backfill_thor_events")
+
+
+def _is_thor_event(path: Path) -> bool:
+    if not path.is_file():
+        return False
+    if path.name.endswith((".sfm.json", ".h5", "_ASCII.TXT")):
+        return False
+    return path.suffix.upper() in (".IDFW", ".IDFH")
+
+
+def _vtuple(s: str) -> tuple:
+    try:
+        return tuple(int(p) for p in str(s).split(".")[:3])
+    except Exception:
+        return (0, 0, 0)
+
+
+def main(argv=None) -> int:
+    p = argparse.ArgumentParser(description=__doc__)
+    p.add_argument(
+        "--db-path",
+        default=str(Path(__file__).resolve().parent.parent / "bridges" / "captures" / "seismo_relay.db"),
+        help="Used only to derive the default --store-root.",
+    )
+    p.add_argument("--store-root", default=None)
+    p.add_argument("--dry-run", action="store_true")
+    p.add_argument("--skip-hdf5", action="store_true",
+                   help="Don't regenerate .h5 files for IDFW events.")
+    p.add_argument("--force", action="store_true",
+                   help="Refresh every Thor event, not just ones with stale or missing bw_report.")
+    p.add_argument("-v", "--verbose", action="store_true")
+    args = p.parse_args(argv)
+
+    logging.basicConfig(
+        level=logging.DEBUG if args.verbose else logging.INFO,
+        format="%(asctime)s  %(levelname)-7s  %(name)s  %(message)s",
+        datefmt="%H:%M:%S",
+    )
+
+    db_path = Path(args.db_path).expanduser().resolve()
+    store_root = (
+        Path(args.store_root).expanduser().resolve()
+        if args.store_root else db_path.parent / "waveforms"
+    )
+    if not store_root.exists():
+        log.error("store root not found: %s", store_root)
+        return 1
+    store = WaveformStore(store_root)
+    log.info("store root: %s", store_root)
+    log.info("current TOOL_VERSION: %s", event_file_io.TOOL_VERSION)
+
+    refreshed = skipped = errors = h5_written = 0
+
+    # Lazy imports so any one of these failing produces a useful error
+    # message rather than crashing module-load.
+    from micromate.idf_file import read_idf_file
+    from micromate.idf_to_bw_report import build_bw_report_from_idf
+
+    for serial_dir in sorted(p for p in store_root.iterdir() if p.is_dir()):
+        serial = serial_dir.name
+        for path in sorted(serial_dir.iterdir()):
+            if not _is_thor_event(path):
+                continue
+
+            sidecar_path = store.sidecar_path_for(serial, path.name)
+            if not sidecar_path.exists():
+                log.debug("%s: no sidecar — skipping (this is a binary without ingest history)",
+                          path.name)
+                skipped += 1
+                continue
+
+            try:
+                existing = event_file_io.read_sidecar(sidecar_path)
+            except Exception as exc:
+                log.warning("%s: failed to read sidecar — %s", path.name, exc)
+                errors += 1
+                continue
+
+            has_bw_report = bool(existing.get("bw_report"))
+            existing_version = (existing.get("source") or {}).get("tool_version", "")
+            up_to_date = (
+                has_bw_report
+                and _vtuple(existing_version) >= _vtuple(event_file_io.TOOL_VERSION)
+            )
+            if up_to_date and not args.force:
+                skipped += 1
+                continue
+
+            # Re-decode the binary.  Catch + log; continue with .txt-only
+            # data if it fails (matches the live ingest path's behavior).
+            idf_samples = None
+            idf_intervals = None
+            binary_md = None
+            is_histogram = path.suffix.upper() == ".IDFH"
+            try:
+                binary_bytes = path.read_bytes()
+                res = read_idf_file(path, data=binary_bytes)
+                idf_samples = res.samples or None
+                idf_intervals = res.intervals
+                binary_md = res.binary_metadata
+                is_histogram = res.intervals is not None
+            except NotImplementedError:
+                # sig-B / Blastware-stray binary; no samples but adapter
+                # can still produce a bw_report from extensions.idf_report.
+                log.debug("%s: binary codec NotImplementedError (sig-B / BW-stray); proceeding from sidecar's idf_report only", path.name)
+            except Exception as exc:
+                log.warning("%s: binary decode failed — %s; proceeding from sidecar's idf_report only", path.name, exc)
+
+            # Run the adapter.  Pull report_dict from
+            # extensions.idf_report (the v0.18.0+ ingest preserved it).
+            report_dict = (existing.get("extensions") or {}).get("idf_report") or {}
+            if not report_dict and binary_md is None:
+                log.debug("%s: no idf_report in sidecar AND no binary metadata — nothing to project", path.name)
+                skipped += 1
+                continue
+
+            try:
+                bw_report = build_bw_report_from_idf(
+                    report_dict, binary_md=binary_md,
+                    intervals=idf_intervals, is_histogram=is_histogram,
+                )
+            except Exception as exc:
+                log.warning("%s: adapter failed — %s", path.name, exc)
+                errors += 1
+                continue
+
+            # Build the new sidecar by overlaying refreshed fields onto
+            # the existing one — preserves review, captured_at, blastware
+            # block, source.kind, etc.
+            new_sidecar = dict(existing)  # shallow copy
+            new_sidecar["bw_report"] = bw_report
+            src = dict(new_sidecar.get("source") or {})
+            src["tool_version"] = event_file_io.TOOL_VERSION
+            new_sidecar["source"] = src
+
+            # Preserve histogram intervals if the binary decoded them
+            # (improves over the original ingest if that one ran before
+            # the bee1185 codec fix).
+            if idf_intervals is not None:
+                ext = dict(new_sidecar.get("extensions") or {})
+                ext["idf_intervals"] = [
+                    {
+                        "offset":     iv.offset,
+                        "tran_peak":  iv.peak_count("Tran"),
+                        "tran_halfp": iv.tran_halfp,
+                        "tran_freq":  iv.freq_hz("Tran"),
+                        "vert_peak":  iv.peak_count("Vert"),
+                        "vert_halfp": iv.vert_halfp,
+                        "vert_freq":  iv.freq_hz("Vert"),
+                        "long_peak":  iv.peak_count("Long"),
+                        "long_halfp": iv.long_halfp,
+                        "long_freq":  iv.freq_hz("Long"),
+                        "mic_peak":   iv.peak_count("MicL"),
+                        "mic_halfp":  iv.micl_halfp,
+                        "mic_freq":   iv.freq_hz("MicL"),
+                    }
+                    for iv in idf_intervals
+                ]
+                new_sidecar["extensions"] = ext
+
+            if args.dry_run:
+                will_write_h5 = (idf_samples or idf_intervals) and not args.skip_hdf5
+                log.info("[DRY] %s/%s — would refresh sidecar (bw_report=%s, h5=%s)",
+                         serial, path.name,
+                         "wrote" if not has_bw_report else "refreshed",
+                         "would write" if will_write_h5 else "skipped")
+            else:
+                event_file_io.write_sidecar(sidecar_path, new_sidecar)
+                log.info("%s/%s — sidecar refreshed (bw_report=%s, intervals=%d)",
+                         serial, path.name,
+                         "added" if not has_bw_report else "refreshed",
+                         len(idf_intervals) if idf_intervals else 0)
+            refreshed += 1
+
+            # Regenerate .h5 by replaying the same IdfEvent → Event bridge
+            # save_imported_idf uses.  For IDFW we write the decoded per-
+            # sample arrays.  For IDFH we synthesise a 1-sample-per-interval
+            # array (peak ADC count per channel per interval) so the
+            # renderer's bar-chart code has something to group on.
+            # Pre-condition: either real samples (IDFW) or decoded intervals
+            # (IDFH).  Skip otherwise.
+            have_data = bool(idf_samples) or bool(idf_intervals)
+            if have_data and not args.skip_hdf5:
+                from sfm import event_hdf5
+                hdf5_path = store.hdf5_path_for(serial, path.name)
+                if args.dry_run:
+                    log.debug("[DRY] would write %s", hdf5_path.name)
+                else:
+                    try:
+                        from micromate import IdfEvent
+                        from minimateplus.event_file_io import file_sha256
+                        idf_event = IdfEvent.from_report(report_dict, path.name)
+
+                        # Merge the binary-derived mic peak psi (only the
+                        # binary path knows the proper psi value; the .txt
+                        # carries dB(L)).  Without this, the h5 writer's
+                        # per-count mic factor is computed against the
+                        # dB(L) value-as-pseudo-psi and the mic chart
+                        # scales wildly.
+                        if (binary_md is not None and res is not None
+                                and res.event.peaks.mic_pspl_psi is not None):
+                            idf_event.peaks.mic_pspl_psi = res.event.peaks.mic_pspl_psi
+
+                        sha256 = file_sha256(path)
+                        waveform_key = bytes.fromhex(sha256)[:16]
+                        ev = idf_event.to_minimateplus_event(waveform_key)
+
+                        if is_histogram and idf_intervals:
+                            # 1 sample per interval per channel — same
+                            # synthesis save_imported_idf uses.  The h5
+                            # writer's count×geo_fs/32768 conversion turns
+                            # each peak-ADC-count into the bar's physical
+                            # value.
+                            ev.raw_samples = {
+                                "Tran": [iv.peak_count("Tran") for iv in idf_intervals],
+                                "Vert": [iv.peak_count("Vert") for iv in idf_intervals],
+                                "Long": [iv.peak_count("Long") for iv in idf_intervals],
+                                "MicL": [iv.peak_count("MicL") for iv in idf_intervals],
+                            }
+                            ev.total_samples = ev.total_samples or len(idf_intervals)
+                        elif idf_samples:
+                            ev.raw_samples = idf_samples
+                            n_samp = max(
+                                (len(idf_samples.get(ch, []))
+                                 for ch in ("Tran", "Vert", "Long", "MicL")),
+                                default=0,
+                            )
+                            ev.total_samples = ev.total_samples or n_samp
+
+                        event_hdf5.write_event_hdf5(
+                            hdf5_path, ev,
+                            serial=serial,
+                            geo_range="normal",
+                            source_kind="idf-import",
+                            tool_version=event_file_io.TOOL_VERSION,
+                        )
+                        h5_written += 1
+                        log.debug("%s/%s — .h5 written (%s)",
+                                  serial, path.name,
+                                  f"{len(idf_intervals)} intervals" if is_histogram
+                                  else f"{sum(len(v) for v in (idf_samples or {}).values())} samples")
+                    except Exception as exc:
+                        log.warning("%s/%s — .h5 write failed: %s",
+                                    serial, path.name, exc)
+
+    log.info("Done.  refreshed=%d  skipped=%d  errors=%d  h5_written=%d",
+             refreshed, skipped, errors, h5_written)
+    return 0 if errors == 0 else 2
+
+
+if __name__ == "__main__":
+    sys.exit(main())
@@ -0,0 +1,91 @@
+"""Re-ingest a prod IDFW + IDFH via the patched save_imported_idf and
+render both PDFs to confirm charts have data."""
+from __future__ import annotations
+import sys
+import json
+import datetime
+import tempfile
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+
+from sfm.waveform_store import WaveformStore
+from sfm import report_pdf
+import h5py
+
+
+class FakeDb:
+    def __init__(self, event):
+        self.event = event
+    def get_event(self, _id):
+        return self.event
+
+
+def to_ts_iso(ts):
+    if ts is None:
+        return None
+    try:
+        return datetime.datetime(ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.second).isoformat()
+    except Exception:
+        return None
+
+
+def render_case(idf_path: Path, serial: str, out_pdf: Path, h5_summary: bool = True):
+    with tempfile.TemporaryDirectory() as td:
+        store = WaveformStore(Path(td))
+        ev, rec = store.save_imported_idf(
+            idf_path.read_bytes(),
+            idf_path,
+            idf_report_text=None,    # production worst case: no .txt
+        )
+        print(f"=== {idf_path.name} ===")
+        print(f"  h5: {rec['hdf5_filename']}, sidecar: {rec['sidecar_filename']}")
+
+        h5p = Path(td) / serial / f"{idf_path.name}.h5"
+        if h5p.exists() and h5_summary:
+            with h5py.File(h5p) as h:
+                for ch in ("Tran", "Vert", "Long", "MicL"):
+                    ds = h.get(f"samples/{ch}")
+                    if ds is not None:
+                        n = ds.shape[0]
+                        mx = float(abs(ds[...]).max()) if n else 0
+                        print(f"  samples/{ch}: n={n}  max_abs={mx:.5f}")
+
+        record_type = "Histogram" if idf_path.suffix.upper() == ".IDFH" else "Waveform"
+        fake_row = {
+            "serial":              serial,
+            "blastware_filename":  rec["filename"],
+            "record_type":         record_type,
+            "timestamp":           to_ts_iso(ev.timestamp),
+            "sample_rate":         ev.sample_rate,
+            "project":             ev.project_info.project if ev.project_info else None,
+            "client":              ev.project_info.client if ev.project_info else None,
+            "operator":            ev.project_info.operator if ev.project_info else None,
+            "sensor_location":     ev.project_info.sensor_location if ev.project_info else None,
+            "created_at":          None,
+        }
+        rd = report_pdf.gather_report_data(FakeDb(fake_row), store, event_id="test-1")
+        print(f"  ReportData: channels={ {k: len(v) for k,v in rd.channels.items()} }")
+        if rd.is_histogram:
+            print(f"  histogram n_intervals={rd.histogram_n_intervals} interval_size={rd.histogram_interval_size}")
+        pdf = report_pdf.render_event_report_pdf(rd)
+        out_pdf.write_bytes(pdf)
+        print(f"  PDF: {out_pdf}  ({len(pdf)} bytes)")
+
+
+def main():
+    out_dir = Path("/tmp/thor_render_test"); out_dir.mkdir(exist_ok=True)
+    cases = [
+        # IDFW that decoded to preamble-only under the old codec
+        ("/home/serversdown/seismo-relay-prod-snap/waveforms/UM6047/UM6047_20250804154137.IDFW", "UM6047"),
+        # IDFW that worked under the old codec (validates no regression)
+        ("/home/serversdown/seismo-relay-prod-snap/waveforms/UM6047/UM6047_20250804104450.IDFW", "UM6047"),
+        # IDFH histogram
+        ("/home/serversdown/seismo-relay-prod-snap/waveforms/UM6047/UM6047_20250804190047.IDFH", "UM6047"),
+    ]
+    for path, serial in cases:
+        render_case(Path(path), serial, out_dir / f"{Path(path).name}.pdf")
+
+
+if __name__ == "__main__":
+    main()
@@ -499,6 +499,14 @@ async function loadEvent(eventId) {
  renderEventList();
  setStatus('Loading waveform…');
  try {
+    // Sidecar fetch runs in parallel — its bw_report block carries ZC
+    // Freq + above-range flags + sensor-check results that the per-
+    // channel stats table surfaces.  Failures are non-fatal (legacy
+    // events without a preserved .TXT have no sidecar bw_report).
+    const sidecarP = fetch(`${apiBase}/db/events/${eventId}/sidecar`)
+      .then(r => r.ok ? r.json() : null)
+      .catch(() => null);
+
    const r = await fetch(`${apiBase}/db/events/${eventId}/waveform.json`);
    if (!r.ok) {
      if (r.status === 404) {
@@ -511,7 +519,8 @@ async function loadEvent(eventId) {
    renderWaveform(data);
    // Also fetch metadata from the events list for richer header
    const ev = allEvents.find(e => e.id === eventId);
-    renderMeta(data, ev);
+    const sidecar = await sidecarP;
+    renderMeta(data, ev, sidecar);
    setStatus(`Event loaded.`, 'ok');
  } catch (e) {
    setStatus(`Failed to load event: ${e.message}`, 'error');
@@ -528,7 +537,7 @@ function showEmpty(msg) {
  charts = {};
 }

-function renderMeta(data, ev) {
+function renderMeta(data, ev, sidecar) {
  const metaDiv = document.getElementById('event-meta');
  const fields = [
    ['Serial',      data.serial || ev?.serial || '—'],
@@ -543,14 +552,20 @@ function renderMeta(data, ev) {
  ];

  // Per-channel stats table mirroring the printout's middle block.
-  // Pulls per-channel PPV from the events row (DB columns) and additional
-  // details (peak time, peak accel, peak displacement, sensor check) from
-  // bw_report when present.
+  // PPV from the events DB row; ZC Freq + saturation flags from the
+  // sidecar's bw_report block (when a .TXT was preserved on ingest).
+  const bwrPeaks = (sidecar?.bw_report || {}).peaks || {};
+  const bwrMic   = (sidecar?.bw_report || {}).mic   || {};
  const fmt = v => (v == null ? '—' : (typeof v === 'number' ? v.toFixed(3) : v));
+  const fmtZc = bwr => {
+    if (!bwr || bwr.zc_freq_hz == null) return '—';
+    const prefix = bwr.zc_freq_above_range ? '>' : '';
+    return `${prefix}${Math.round(bwr.zc_freq_hz)} Hz`;
+  };
  const rows = [
-    ['Tran', ev?.tran_ppv],
-    ['Vert', ev?.vert_ppv],
-    ['Long', ev?.long_ppv],
+    ['Tran', ev?.tran_ppv, fmtZc(bwrPeaks.tran)],
+    ['Vert', ev?.vert_ppv, fmtZc(bwrPeaks.vert)],
+    ['Long', ev?.long_ppv, fmtZc(bwrPeaks.long)],
  ];
  // Mic display honors the current user preference (dBL default).
  // mic_ppv is stored as raw psi on series3 events; convert when needed.
@@ -568,11 +583,11 @@ function renderMeta(data, ev) {
  const statsHtml = `
    <table class="stats-table">
      <thead>
-        <tr><th>Channel</th><th>PPV (in/s)</th></tr>
+        <tr><th>Channel</th><th>PPV (in/s)</th><th>ZC Freq</th></tr>
      </thead>
      <tbody>
-        ${rows.map(([ch, ppv]) => `<tr><td>${ch}</td><td>${fmt(ppv)}</td></tr>`).join('')}
-        <tr><td>MicL</td><td>${micStr}</td></tr>
+        ${rows.map(([ch, ppv, zc]) => `<tr><td>${ch}</td><td>${fmt(ppv)}</td><td>${zc}</td></tr>`).join('')}
+        <tr><td>MicL</td><td>${micStr}</td><td>${fmtZc(bwrMic)}</td></tr>
      </tbody>
    </table>
  `;
@@ -717,8 +732,9 @@ function renderWaveform(data) {
    // up AND down).  Mic + histograms keep default auto-scale (always
    // positive values; zero at the bottom).
    let yBounds = {};
-    const isGeoWaveform = !isHistogram && ch !== 'MicL';
-    if (isGeoWaveform) {
+    const isGeo = ch !== 'MicL';
+    if (isGeo && !isHistogram) {
+      // Waveform geo: symmetric around zero for full shape detail.
      let absMax = 0;
      for (const v of values) {
        const a = Math.abs(v);
@@ -726,13 +742,25 @@ function renderWaveform(data) {
      }
      const padded = (absMax || 1) * 1.10;
      yBounds = { min: -padded, max: padded };
+    } else if (isGeo && isHistogram) {
+      // Histogram geo: enforce minimum chart range so quiet events
+      // look quiet (matches BW's near-fixed-scale convention).
+      const HIST_GEO_MIN_INS = 0.05;
+      let p = 0;
+      for (const v of values) { const a = Math.abs(v); if (a > p) p = a; }
+      yBounds = { min: 0, max: Math.max(p * 1.10, HIST_GEO_MIN_INS) };
    } else if (ch === 'MicL' && micUnit === 'dBL') {
-      // Baseline at noise-floor minimum (matches what we floored
-      // null/quiet samples to), top at peak + 5 dB headroom.
+      // Mic dBL: baseline at noise-floor minimum, top at peak + 5 dB.
      const peakDbl = (typeof peak === 'number' && isFinite(peak))
        ? peak + 5
        : 100;
      yBounds = { min: MIC_DBL_FLOOR, max: Math.max(peakDbl, MIC_DBL_FLOOR + 20) };
+    } else if (ch === 'MicL' && isHistogram && micUnit === 'psi') {
+      // Mic histogram in psi: same minimum-range treatment as geo.
+      const HIST_MIC_MIN_PSI = 0.001;
+      let p = 0;
+      for (const v of values) { const a = Math.abs(v); if (a > p) p = a; }
+      yBounds = { min: 0, max: Math.max(p * 1.10, HIST_MIC_MIN_PSI) };
    }

    const chart = new Chart(canvas, {
@@ -99,6 +99,7 @@ class ReportData:
    mic_pspl_time_s:        Optional[float] = None
    mic_pspl_when_str:      Optional[str] = None    # histogram absolute date+time, BW-formatted
    mic_zc_freq_hz:         Optional[float] = None
+    mic_zc_freq_above_range: bool           = False
    mic_channel_test_result: Optional[str] = None
    mic_channel_test_freq_hz: Optional[float] = None
    mic_channel_test_amp_mv: Optional[float] = None
@@ -129,6 +130,7 @@ class ReportData:
    histogram_stop_str:     Optional[str] = None
    histogram_n_intervals:  Optional[float] = None     # 4.00
    histogram_interval_size: Optional[str] = None      # "1 minute"
+    histogram_interval_size_s: Optional[float] = None  # 60.0 — numeric seconds, used to derive interval_times
    histogram_interval_times: list[str] = field(default_factory=list)  # per-interval timestamps for x-axis

    # Peak Vector Sum metadata (histograms show absolute date+time)
@@ -216,6 +218,7 @@ def gather_report_data(
            rd.mic_pspl_psi = DBL_REF_PSI * (10 ** (rd.mic_pspl_dbl / 20))
        rd.mic_pspl_time_s = mic.get("time_of_peak_s")
        rd.mic_zc_freq_hz             = mic.get("zc_freq_hz")
+        rd.mic_zc_freq_above_range    = bool(mic.get("zc_freq_above_range"))
        sc_mic = (bw.get("sensor_check") or {}).get("mic") or {}
        rd.mic_channel_test_result   = sc_mic.get("result")
        rd.mic_channel_test_freq_hz  = sc_mic.get("freq_hz")
@@ -238,6 +241,7 @@ def gather_report_data(
                "name":               ch_label,
                "ppv_ips":            ch.get("ppv_ips"),
                "zc_freq_hz":         ch.get("zc_freq_hz"),
+                "zc_freq_above_range": bool(ch.get("zc_freq_above_range")),
                "time_of_peak_s":     ch.get("time_of_peak_s"),
                "peak_accel_g":       ch.get("peak_accel_g"),
                "peak_disp_in":       ch.get("peak_disp_in"),
@@ -265,6 +269,7 @@ def gather_report_data(
            rd.histogram_stop_str    = hist_block.get("stop")
            rd.histogram_n_intervals = hist_block.get("n_intervals")
            rd.histogram_interval_size = hist_block.get("interval_size")
+            rd.histogram_interval_size_s = hist_block.get("interval_size_s")
            rd.histogram_interval_times = hist_block.get("interval_times") or []

    # ── Waveform samples — from the .h5 via the existing helper ──
@@ -285,6 +290,43 @@ def gather_report_data(
        except Exception as exc:
            log.warning("gather_report_data: hdf5 read failed: %s", exc)

+    # ── Histogram aggregation ──
+    # Codec emits ~N per-block samples (typically 1/sec); BW reports
+    # one bar per configured interval (1 min / 5 min / etc.).  When
+    # bw_report.histogram.n_intervals is populated (events ingested
+    # with the parser extension), group max-per-group to match.  Also
+    # derives per-interval timestamps for the x-axis.  No-op for
+    # waveform events or when n_intervals is missing.
+    if rd.is_histogram and rd.histogram_n_intervals and rd.histogram_n_intervals >= 1:
+        n = int(rd.histogram_n_intervals)
+        for ch, vals in list(rd.channels.items()):
+            if not vals:
+                continue
+            per_group = len(vals) // n
+            remainder = len(vals) % n
+            agg: list = []
+            offset = 0
+            for i in range(n):
+                grp_size = per_group + (1 if i < remainder else 0)
+                if grp_size > 0:
+                    grp = vals[offset:offset + grp_size]
+                    agg.append(max((abs(v) for v in grp if v is not None), default=0))
+                    offset += grp_size
+                else:
+                    agg.append(0)
+            rd.channels[ch] = agg
+        # Derive per-interval HH:MM:SS labels if we have the start time + size
+        if rd.histogram_start_str and rd.histogram_interval_size_s and not rd.histogram_interval_times:
+            try:
+                import datetime as _dt
+                start = _dt.datetime.fromisoformat(rd.histogram_start_str)
+                rd.histogram_interval_times = [
+                    (start + _dt.timedelta(seconds=(i + 1) * rd.histogram_interval_size_s)).strftime("%H:%M:%S")
+                    for i in range(n)
+                ]
+            except Exception:
+                pass
+
    return rd


@@ -308,16 +350,20 @@ def render_event_report_pdf(rd: ReportData) -> bytes:
    else:
        _render_waveform_layout(fig, rd)

-    # Footer (common to both layouts) — Created date + Xmark-like attribution.
+    # Page footer (common to both layouts) — Created date + event id.
+    # Pushed to the very page bottom so it doesn't collide with the
+    # waveform footer scale / trigger legend lines just above.
+    # Convert UTC server_received_at to local for display.
+    created_local = _fmt_iso_to_bw(rd.server_received_at) if rd.server_received_at else "—"
    fig.text(
-        0.07, 0.015,
-        f"Created: {rd.server_received_at or '—'}  •  seismo-relay",
-        fontsize=7, color="#888", ha="left",
+        0.07, 0.005,
+        f"Created: {created_local}  •  seismo-relay",
+        fontsize=6, color="#888", ha="left",
    )
    fig.text(
-        0.93, 0.015,
+        0.93, 0.005,
        f"Event {rd.event_id[:8] if rd.event_id else '—'}",
-        fontsize=7, color="#888", ha="right",
+        fontsize=6, color="#888", ha="right",
    )

    buf = io.BytesIO()
@@ -331,10 +377,13 @@ def _render_waveform_layout(fig, rd: ReportData) -> None:

    Stats table includes Time (Rel. to Trig), Peak Accel, Peak Disp.
    Left margin sized to fit the channel labels (MicL/Long/Vert/Tran).
+    Extra bottom margin reserves space for x-axis tick labels +
+    "Amplitude Geo: X in/s/div Mic: Y psi(L)/div" footer + trigger
+    legend without overlap.
    """
    gs = fig.add_gridspec(
        nrows=4, ncols=1,
-        left=0.11, right=0.94, top=0.97, bottom=0.06,
+        left=0.11, right=0.94, top=0.97, bottom=0.12,
        height_ratios=[1.7, 2.0, 1.8, 5.5],
        hspace=0.35,
    )
@@ -355,11 +404,13 @@ def _render_histogram_layout(fig, rd: ReportData) -> None:

    No USBM compliance chart (it's a waveform-only concept).  Stats table
    uses Date + Time-of-peak instead of relative-time + accel + disp.
-    Left margin sized to fit the channel labels.
+    Left margin sized to fit the channel labels.  Extra bottom margin
+    leaves room for the x-axis time labels + footer scale legend
+    without overlap.
    """
    gs = fig.add_gridspec(
        nrows=4, ncols=1,
-        left=0.11, right=0.94, top=0.97, bottom=0.06,
+        left=0.11, right=0.94, top=0.97, bottom=0.12,
        height_ratios=[1.8, 0.9, 1.7, 5.6],
        hspace=0.35,
    )
@@ -375,31 +426,50 @@ def _render_histogram_layout(fig, rd: ReportData) -> None:
    _draw_histogram_subplot(fig, gs[3], rd)


+def _to_display_local(iso: str):
+    """Parse an ISO timestamp and return a datetime in the system's local
+    timezone (set by the TZ env var, default America/New_York via the
+    Dockerfile).
+
+    Behaviour:
+      - "...Z" or "...+HH:MM" suffix → tz-aware UTC → converted to local
+      - Naïve "YYYY-MM-DDTHH:MM:SS" (no tz) → returned as-is.  This
+        matches the convention used elsewhere in seismo-relay: BW's
+        recorded-at timestamps are naïve and ALREADY in the unit's
+        local clock; we don't second-guess them.
+    """
+    import datetime as _dt
+    dt = _dt.datetime.fromisoformat(iso.replace("Z", "+00:00"))
+    if dt.tzinfo is not None:
+        # Convert from UTC (or other tz) → local per the TZ env var.
+        # astimezone() without arg uses the system timezone.
+        dt = dt.astimezone()
+    return dt
+
+
 def _fmt_iso_to_bw(iso: Optional[str]) -> Optional[str]:
-    """Convert a ISO-8601 timestamp like '2026-05-16T22:30:37' to BW's
-    display format '22:30:37 May 16, 2026'.  Returns input unchanged if
-    it doesn't look like ISO."""
+    """Convert an ISO-8601 timestamp to BW's display format
+    '22:30:37 May 16, 2026'.  UTC inputs (with Z suffix) are
+    converted to the system's local timezone first; naïve inputs
+    are formatted as-is.  Returns input unchanged on parse failure."""
    if not iso or "T" not in iso:
        return iso
    try:
-        import datetime as _dt
-        dt = _dt.datetime.fromisoformat(iso.replace("Z", "+00:00"))
-        return dt.strftime("%H:%M:%S %B %d, %Y").replace(" 0", " ")
+        return _to_display_local(iso).strftime("%H:%M:%S %B %d, %Y").replace(" 0", " ")
    except Exception:
        return iso


 def _split_iso_to_date_time(iso: Optional[str]) -> tuple[Optional[str], Optional[str]]:
-    """Split an ISO timestamp into BW-formatted ("May 27 /26", "06:06:14")
+    """Split an ISO timestamp into BW-formatted ('May 27 /26', '06:06:14')
    date+time strings.  Used for the histogram stats table where the
-    Date and Time rows are presented separately.  Returns (None, None)
-    if the input isn't a valid ISO datetime."""
+    Date and Time rows are presented separately.  UTC inputs are
+    converted to local time first.  Returns (None, None) on parse failure."""
    if not iso:
        return (None, None)
    try:
-        import datetime as _dt
-        dt = _dt.datetime.fromisoformat(iso.replace("Z", "+00:00"))
-        # BW format: "May 27 /26" (3-letter month + 2-digit year)
+        dt = _to_display_local(iso)
+        # BW format: 'May 27 /26' (3-letter month + 2-digit year)
        date_str = dt.strftime("%b %d /%y").replace(" 0", " ")
        time_str = dt.strftime("%H:%M:%S")
        return (date_str, time_str)
@@ -545,7 +615,8 @@ def _mic_rows(rd: ReportData) -> list[tuple[str, Optional[str]]]:
            line += f" at {rd.mic_pspl_time_s:.3f} sec."
        rows.append(("PSPL", line))
    if rd.mic_zc_freq_hz is not None:
-        rows.append(("ZC Freq", f"{rd.mic_zc_freq_hz:.0f} Hz"))
+        prefix = ">" if rd.mic_zc_freq_above_range else ""
+        rows.append(("ZC Freq", f"{prefix}{rd.mic_zc_freq_hz:.0f} Hz"))
    if rd.mic_channel_test_result:
        line = rd.mic_channel_test_result
        if rd.mic_channel_test_freq_hz is not None and rd.mic_channel_test_amp_mv is not None:
@@ -567,14 +638,7 @@ def _draw_channel_stats_waveform(ax, rd: ReportData) -> None:
        ("Sensor Check",         "sensor_check",   ""),
    ]
    _draw_stats_table(ax, rd, rows_spec)
-    if rd.peak_vector_sum_ips is not None:
-        line = f"Peak Vector Sum   {rd.peak_vector_sum_ips:.3f} in/s"
-        if rd.peak_vector_sum_time_s is not None:
-            line += f" At {rd.peak_vector_sum_time_s:.3f} sec."
-        ax.text(0.0, -0.08, line, fontsize=9, weight="bold",
-                ha="left", va="top", transform=ax.transAxes)
-        ax.text(0.0, -0.18, "NA: Not Applicable", fontsize=7, color="#888",
-                ha="left", va="top", transform=ax.transAxes)
+    _draw_pvs_summary(ax, rd, n_data_rows=len(rows_spec))


 def _draw_channel_stats_histogram(ax, rd: ReportData) -> None:
@@ -592,20 +656,54 @@ def _draw_channel_stats_histogram(ax, rd: ReportData) -> None:
        ("Sensor Check", "sensor_check",    ""),
    ]
    _draw_stats_table(ax, rd, rows_spec)
-    if rd.peak_vector_sum_ips is not None:
+    _draw_pvs_summary(ax, rd, n_data_rows=len(rows_spec), histogram_when=True)
+
+
+def _draw_pvs_summary(
+    ax,
+    rd: ReportData,
+    *,
+    n_data_rows: int,
+    histogram_when: bool = False,
+) -> None:
+    """Render the Peak Vector Sum + 'NA: Not Applicable' caption below the
+    stats table.
+
+    Reads ``ax._stats_table_bottom`` (set by ``_draw_stats_table`` when
+    it pins the table via an explicit ``bbox``) so the PVS line lands
+    just below the table's known bottom edge instead of guessing at the
+    geometry.
+
+    Centered horizontally for visual balance (the previous left-aligned
+    x=0 landed under the label column, not the data, which looked off).
+    """
+    if rd.peak_vector_sum_ips is None:
+        return
+
    line = f"Peak Vector Sum   {rd.peak_vector_sum_ips:.3f} in/s"
-        # Histograms: "0.091 in/s on May 27, 2026 At 06:06:14"
-        # The when_str is "HH:MM:SS Month DD, YYYY" — reformat for BW match.
-        if rd.peak_vector_sum_when_str:
+    if histogram_when and rd.peak_vector_sum_when_str:
+        # Histogram absolute date+time.  when_str is "HH:MM:SS Month DD, YYYY";
+        # reformat to "<value> on <date> At <time>" to match BW.
        parts = rd.peak_vector_sum_when_str.split(" ", 1)
        if len(parts) == 2:
            line += f" on {parts[1]} At {parts[0]}"
        else:
            line += f" on {rd.peak_vector_sum_when_str}"
-        ax.text(0.0, -0.08, line, fontsize=9, weight="bold",
-                ha="left", va="top", transform=ax.transAxes)
-        ax.text(0.0, -0.18, "NA: Not Applicable", fontsize=7, color="#888",
-                ha="left", va="top", transform=ax.transAxes)
+    elif not histogram_when and rd.peak_vector_sum_time_s is not None:
+        line += f" At {rd.peak_vector_sum_time_s:.3f} sec."
+
+    # _draw_stats_table stashes the bbox bottom on the axes so we don't
+    # have to guess geometry.  Falls back to a conservative default if
+    # the bbox approach hasn't run.
+    table_bottom_y = getattr(ax, "_stats_table_bottom", -0.10)
+    pvs_y = table_bottom_y - 0.04   # small gap below the table border
+
+    # Centered for visual balance — looks intentional rather than offset.
+    # The original BW-replica had a "NA: Not Applicable" caption below
+    # this line; dropped because we use "—" for missing values and the
+    # legend was always squished against the PVS line.
+    ax.text(0.5, pvs_y, line, fontsize=9, weight="bold",
+            ha="center", va="top", transform=ax.transAxes)


 def _draw_stats_table(ax, rd: ReportData, rows_spec: list[tuple[str, str, str]]) -> None:
@@ -617,13 +715,17 @@ def _draw_stats_table(ax, rd: ReportData, rows_spec: list[tuple[str, str, str]])
    ch_lookup = {c["name"]: c for c in rd.channel_stats}

    def _cell(field, ch_name):
-        val = ch_lookup.get(ch_name, {}).get(field)
+        ch_rec = ch_lookup.get(ch_name, {})
+        val = ch_rec.get(field)
        if val is None:
            return "—"
        if isinstance(val, float):
-            # ZC Freq is integer-formatted in BW; everything else with 3 decimals
+            # ZC Freq is integer-formatted in BW; ">100 Hz" sentinel
+            # rendered as ">N" (val carries the threshold).  Everything
+            # else gets 3 decimals.
            if field == "zc_freq_hz":
-                return f"{val:.0f}"
+                prefix = ">" if ch_rec.get("zc_freq_above_range") else ""
+                return f"{prefix}{val:.0f}"
            return f"{val:.3f}"
        return str(val)

@@ -636,16 +738,28 @@ def _draw_stats_table(ax, rd: ReportData, rows_spec: list[tuple[str, str, str]])
            _cell(field_name, "Long"),
            unit,
        ])
+    # Pin the table's position+size via bbox so we know exactly where
+    # the bottom edge lands.  Lets _draw_pvs_summary place the PVS line
+    # just below the table without guessing at row heights.
+    #
+    # bbox = [x, y, width, height] in axes coords.  Header + data rows
+    # at row_h each; horizontal extent matches sum(colWidths).
+    n_rows = len(table_data)        # header + data rows
+    row_h  = 0.12                   # axes-fraction per row (fits fontsize=8)
+    table_height = n_rows * row_h
+    table_bottom = 1.0 - table_height
    tbl = ax.table(
-        cellText=table_data, loc="upper left",
+        cellText=table_data,
        colWidths=[0.28, 0.14, 0.14, 0.14, 0.10],
        cellLoc="left", edges="open",
+        bbox=[0.0, table_bottom, 0.80, table_height],
    )
    tbl.auto_set_font_size(False)
    tbl.set_fontsize(8)
-    tbl.scale(1, 1.4)
    for j in range(5):
        tbl[(0, j)].set_text_props(weight="bold", color="#555")
+    # Stash the bottom Y so _draw_pvs_summary can position itself below.
+    ax._stats_table_bottom = table_bottom


 def _channel_axis_color(ch: str) -> str:
@@ -718,22 +832,42 @@ def _draw_waveform_subplot(fig, gridspec_cell, rd: ReportData) -> None:
            geo_amp_div = f"{(amax * 1.1 * 2) / 10:.3f}"
            break
    fig.text(
-        0.07, 0.045,
+        0.11, 0.030,
        f"Time(Seconds) {div_s:.2f} sec/div   Amplitude Geo: {geo_amp_div} in/s/div   Mic: 0.001 psi(L)/div",
        fontsize=7, color="#444", ha="left",
    )
    fig.text(
-        0.07, 0.030,
+        0.11, 0.018,
        "Trigger = ▶━━━━━ ━━━━━━◀",
        fontsize=7, color="#444", ha="left",
    )


+def _nice_geo_step(amax: float) -> float:
+    """Pick a "nice" per-division step for the geo y-axis.
+
+    Geo LSB is 0.005 in/s — sub-LSB steps like 0.003/div are nonsense.
+    Quantize to the BW-style 1-2-5 sequence (0.005, 0.01, 0.025, 0.05,
+    …) and return the smallest step where 5 divisions >= amax, so the
+    top of the chart lands on a tick.
+    """
+    if amax <= 0:
+        return 0.005
+    for step in (0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0):
+        if step * 5 >= amax:
+            return step
+    return 10.0
+
+
 def _draw_histogram_subplot(fig, gridspec_cell, rd: ReportData) -> None:
    """4-channel stacked histogram bar chart — per-interval peaks.

    X-axis labeled with the actual times from rd.histogram_interval_times
    when available; otherwise interval index.
+
+    The three geo channels share a single y-axis scale (a BW-style nice
+    multiple of the 0.005 in/s LSB) so bar heights are directly
+    comparable across channels.  MicL has its own auto-scale.
    """
    inner = gridspec_cell.subgridspec(4, 1, hspace=0.0)
    order = ["MicL", "Long", "Vert", "Tran"]
@@ -742,6 +876,16 @@ def _draw_histogram_subplot(fig, gridspec_cell, rd: ReportData) -> None:
    # X-axis: use absolute time labels if we have them, else interval index
    have_times = bool(rd.histogram_interval_times)

+    # Shared geo scale: max across Tran/Vert/Long, quantized to a nice
+    # tick step.  Used for ylim + the footer "Amplitude Geo: X in/s/div".
+    geo_amax = 0.0
+    for gch in ("Tran", "Vert", "Long"):
+        gv = rd.channels.get(gch) or []
+        if gv:
+            geo_amax = max(geo_amax, max(abs(x) for x in gv if x is not None))
+    geo_step = _nice_geo_step(geo_amax)
+    geo_top  = geo_step * 5  # 5 divisions — top tick lands at this value
+
    for i, ch in enumerate(order):
        ax = fig.add_subplot(inner[i])
        values = rd.channels.get(ch) or []
@@ -754,6 +898,10 @@ def _draw_histogram_subplot(fig, gridspec_cell, rd: ReportData) -> None:
            xs = np.arange(len(abs_vals))
            color = _channel_axis_color(ch)
            ax.bar(xs, abs_vals, color=color, width=0.85, linewidth=0)
+            if ch in ("Tran", "Vert", "Long"):
+                ax.set_ylim(0, geo_top)
+                ax.set_yticks([j * geo_step for j in range(6)])
+            else:
                amax = max(abs_vals, default=0)
                if amax > 0:
                    ax.set_ylim(0, amax * 1.10)
@@ -779,17 +927,13 @@ def _draw_histogram_subplot(fig, gridspec_cell, rd: ReportData) -> None:
            ax.tick_params(axis="x", labelsize=7)
        ax.tick_params(axis="y", labelsize=6)

-    # Footer scale info — histograms use minute/div
+    # Footer scale info — histograms use minute/div.  Reuses the shared
+    # geo_step computed above so the label matches the actual y-axis
+    # tick spacing on every subplot.
    interval_str = rd.histogram_interval_size or "—"
-    geo_amp_div = "—"
-    for ch in ("Tran", "Vert", "Long"):
-        v = rd.channels.get(ch) or []
-        if v:
-            amax = max(abs(x) for x in v)
-            geo_amp_div = f"{amax / 5:.3f}"
-            break
+    geo_amp_div = f"{geo_step:.3f}"
    fig.text(
-        0.07, 0.045,
+        0.11, 0.030,
        f"Time {interval_str} /div   Amplitude Geo: {geo_amp_div} in/s/div   Mic: 0.001 psi(L)/div",
        fontsize=7, color="#444", ha="left",
    )
@@ -1989,8 +1989,13 @@ def _cleanup_event_files(row: dict) -> dict:
        bw_path, a5_path = store.paths_for(serial, base_name)
        sc_path  = store.sidecar_path_for(serial, base_name)
        h5_path  = store.hdf5_path_for(serial, base_name)
+        # Preserved BW ASCII report (added 2026-05-27 with the .TXT
+        # preservation feature) — needs to be cleaned up too, otherwise
+        # deletes leave orphan _ASCII.TXT files behind.
+        txt_path = store.txt_path_for(serial, base_name)
        for kind, p in [("blastware", bw_path), ("a5_pickle", a5_path),
-                        ("sidecar", sc_path), ("hdf5", h5_path)]:
+                        ("sidecar", sc_path), ("hdf5", h5_path),
+                        ("txt", txt_path)]:
            try:
                if p.exists():
                    p.unlink()
@@ -2748,8 +2748,9 @@ function _renderScWaveform(data) {
    //   - Mic (always positive sound pressure) + histograms (per-interval
    //     peaks, always positive): default auto-scale, zero at the bottom.
    let yBounds = {};
-    const isGeoWaveform = !isHistogram && ch !== 'MicL';
-    if (isGeoWaveform) {
+    const isGeo = ch !== 'MicL';
+    if (isGeo && !isHistogram) {
+      // Waveform geo: symmetric around zero, full zoom to shape detail.
      let absMax = 0;
      for (const v of values) {
        const a = Math.abs(v);
@@ -2757,13 +2758,31 @@ function _renderScWaveform(data) {
      }
      const padded = (absMax || 1) * 1.10;
      yBounds = { min: -padded, max: padded };
+    } else if (isGeo && isHistogram) {
+      // Histogram geo: enforce a minimum chart range so a quiet
+      // 0.005 in/s event renders as ~10% of chart height instead of
+      // filling the panel.  Matches BW's near-fixed-scale convention
+      // (their footer is "Geo: 0.002 in/s/div" — a chart-relative scale,
+      // not auto-zoom).
+      const HIST_GEO_MIN_INS = 0.05;
+      let peak = 0;
+      for (const v of values) { const a = Math.abs(v); if (a > peak) peak = a; }
+      yBounds = { min: 0, max: Math.max(peak * 1.10, HIST_GEO_MIN_INS) };
    } else if (ch === 'MicL' && micUnit === 'dBL') {
-      // Pin baseline at the chart floor (which matches what we flooded
-      // null/quiet samples to), top at the actual peak + a few dB headroom.
+      // Mic in dBL — pin baseline at noise-floor minimum (where we floored
+      // quiet samples), top at actual peak + a few dB headroom.
      const peakDbl = (typeof chPeak === 'number' && isFinite(chPeak))
        ? chPeak + 5
        : 100;
      yBounds = { min: MIC_DBL_FLOOR, max: Math.max(peakDbl, MIC_DBL_FLOOR + 20) };
+    } else if (ch === 'MicL' && isHistogram && micUnit === 'psi') {
+      // Mic histogram in psi — same minimum-range treatment as geo.
+      // 0.001 psi ≈ 110 dBL — typical "loud" mic peak.  Quiet events
+      // sit near the bottom.
+      const HIST_MIC_MIN_PSI = 0.001;
+      let peak = 0;
+      for (const v of values) { const a = Math.abs(v); if (a > peak) peak = a; }
+      yBounds = { min: 0, max: Math.max(peak * 1.10, HIST_MIC_MIN_PSI) };
    }

    _scCharts[ch] = new Chart(canvas, {
@@ -2867,6 +2886,12 @@ function _renderSidecar(data) {
  const bw   = data.blastware    || {};
  const src  = data.source       || {};
  const rev  = data.review       || {};
+  // bw_report carries the per-channel ASCII-derived stats (ZC Freq,
+  // saturation flags, peak time, etc.).  Only present on events
+  // ingested with a preserved .TXT (post-2026-05-27); falls back to
+  // empty for legacy events.
+  const bwrPeaks = (data.bw_report || {}).peaks || {};
+  const bwrMic   = (data.bw_report || {}).mic   || {};

  document.getElementById('sc-title').textContent = `Event — ${bw.filename || ev.waveform_key || 'unknown'}`;

@@ -2899,11 +2924,19 @@ function _renderSidecar(data) {
  document.getElementById('sc-f-sr').textContent       = (ev.sample_rate ?? '—') + (ev.sample_rate ? ' sps' : '');
  document.getElementById('sc-f-key').textContent      = ev.waveform_key    || '—';

-  document.getElementById('sc-f-tran').textContent     = fmtPpv(pv.transverse);
-  document.getElementById('sc-f-vert').textContent     = fmtPpv(pv.vertical);
-  document.getElementById('sc-f-long').textContent     = fmtPpv(pv.longitudinal);
+  // Suffix with " · {prefix}{N} Hz" when bw_report has a ZC Freq.
+  // Above-range ZC peaks (BW ">100 Hz") get a literal ">" prefix so
+  // operators see the same indicator the PDF shows.
+  const fmtZc = bwr => {
+    if (!bwr || bwr.zc_freq_hz == null) return '';
+    const prefix = bwr.zc_freq_above_range ? '>' : '';
+    return ` · ${prefix}${Math.round(bwr.zc_freq_hz)} Hz`;
+  };
+  document.getElementById('sc-f-tran').textContent     = fmtPpv(pv.transverse)   + fmtZc(bwrPeaks.tran);
+  document.getElementById('sc-f-vert').textContent     = fmtPpv(pv.vertical)     + fmtZc(bwrPeaks.vert);
+  document.getElementById('sc-f-long').textContent     = fmtPpv(pv.longitudinal) + fmtZc(bwrPeaks.long);
  document.getElementById('sc-f-pvs').textContent      = fmtPpv(pv.vector_sum);
-  document.getElementById('sc-f-mic').textContent      = fmtMic(pv.mic_psi);
+  document.getElementById('sc-f-mic').textContent      = fmtMic(pv.mic_psi)      + fmtZc(bwrMic);

  document.getElementById('sc-f-project').textContent  = pi.project         || '—';
  document.getElementById('sc-f-client').textContent   = pi.client          || '—';
@@ -3254,7 +3287,7 @@ if (currentSection === 'db') {
          <dt id="sc-l-bwsize">File size</dt>   <dd id="sc-f-bwsize">—</dd>
          <dt id="sc-l-sha">File sha256</dt>    <dd id="sc-f-sha">—</dd>
          <dt>Source kind</dt>      <dd id="sc-f-src">—</dd>
-          <dt title="When our server received and stored this event (sfm-db insert time, not the recording time)">Received by server at</dt>
+          <dt title="When SFM received and stored this event — NOT the unit-local trigger time (see Timestamp at the top of the modal for that).">Time received</dt>
                                    <dd id="sc-f-cap">—</dd>
        </dl>
      </div>
@@ -467,21 +467,21 @@ class WaveformStore:
        Ingest a Thor (Micromate Series IV) IDF event file (`.IDFW` or
        `.IDFH`) produced by Thor's TXT exporter.

-        Thor binaries are stored as opaque bytes — seismo-relay doesn't
-        yet decode the proprietary IDF binary format (codec slot lives
-        at ``micromate/idf_file.py``).  Device-authoritative metadata
-        comes from the paired ``.IDFW.txt`` / ``.IDFH.txt`` sidecar
-        when supplied.
-
        Workflow:
-          1. Parse the paired TXT report (when supplied) via
-             ``micromate.parse_idf_report`` → dict.
-          2. Wrap parsed dict + filename into a typed ``micromate.IdfEvent``.
-          3. Copy bytes verbatim into ``<root>/<serial>/<filename>``.
-          4. Bridge IdfEvent → ``minimateplus.Event`` (for the existing
-             sidecar / DB insert machinery) via
-             ``IdfEvent.to_minimateplus_event(waveform_key)``.
-          5. Write the ``.sfm.json`` sidecar with
+          1. For sig-A `.IDFW` binaries, decode samples + binary metadata
+             via ``micromate.idf_file.read_idf_file()``.  Failure or
+             non-IDFW path falls through to the .txt-only flow.
+          2. Parse the paired TXT report (when supplied) via
+             ``micromate.parse_idf_report`` → dict.  TXT remains the
+             source of truth for fields the binary doesn't yet supply
+             (full peak set with ZC freq / Time of Peak, sensor self-check,
+             firmware string, project strings).
+          3. Wrap parsed dict + filename into a typed ``micromate.IdfEvent``.
+          4. Copy bytes verbatim into ``<root>/<serial>/<filename>``.
+          5. Bridge IdfEvent → ``minimateplus.Event`` and attach
+             ``raw_samples`` from the binary decoder (when available).
+          6. Write the `.h5` clean-waveform file when samples decoded.
+          7. Write the ``.sfm.json`` sidecar with
             ``source.kind = "idf-import"`` and the full raw IDF report
             under ``extensions.idf_report``.

@@ -490,7 +490,38 @@ class WaveformStore:
        """
        from micromate import IdfEvent, parse_idf_report

-        # Parse the .txt sidecar (best-effort; non-fatal on failure).
+        # 1. Binary decode (sig-A IDFW and IDFH).  Non-fatal: any failure
+        # leaves samples / binary metadata unfilled and we proceed with
+        # the .txt path as before.
+        idf_samples: Optional[dict] = None
+        idf_intervals: Optional[list] = None
+        binary_md = None
+        binary_peaks = None
+        is_histogram = False
+        try:
+            from micromate.idf_file import read_idf_file
+            # Pass idf_bytes through `data=` — at this point in the flow
+            # the binary hasn't been written to disk yet, so the codec
+            # can't read from source_path.  We still pass source_path so
+            # the codec has the filename for error messages + .IDFH
+            # suffix detection.
+            res = read_idf_file(source_path, data=idf_bytes)
+            idf_samples = res.samples or None
+            idf_intervals = res.intervals
+            is_histogram = res.intervals is not None
+            binary_md = res.binary_metadata
+            binary_peaks = res.event.peaks
+        except NotImplementedError:
+            # sig-B — codec doesn't handle this yet.
+            pass
+        except Exception as exc:
+            log.warning(
+                "save_imported_idf: binary codec failed for %s: %s — "
+                "falling back to .txt-only ingest",
+                source_path.name, exc,
+            )
+
+        # 2. Parse the .txt sidecar (best-effort; non-fatal on failure).
        report_dict: dict = {}
        if idf_report_text is not None:
            try:
@@ -501,17 +532,58 @@ class WaveformStore:
                    exc,
                )

-        # Build the typed IdfEvent.  Filename is authoritative for
+        # 3. Backfill report_dict with binary metadata for fields the
+        # .txt didn't supply.  Binary takes precedence on tied fields
+        # where the binary is more reliable (timestamp, sample_rate),
+        # and fills in fields entirely missing from the .txt.
+        if binary_md is not None:
+            if binary_md.serial and not report_dict.get("serial_number"):
+                report_dict["serial_number"] = binary_md.serial
+            if binary_md.event_datetime and not report_dict.get("event_datetime"):
+                report_dict["event_datetime"] = binary_md.event_datetime
+            if binary_md.sample_rate and not report_dict.get("sample_rate"):
+                report_dict["sample_rate"] = binary_md.sample_rate
+            if binary_md.record_time_sec and not report_dict.get("record_time_sec"):
+                report_dict["record_time_sec"] = binary_md.record_time_sec
+            # Calibration date (binary) vs calibration text (.txt) cohabit
+            # under different keys; no overwrite needed.
+            if binary_md.event_datetime and not report_dict.get("event_type"):
+                report_dict["event_type"] = (
+                    "Full Histogram" if is_histogram else "Full Waveform"
+                )
+
+        # Binary-derived peaks fill in when the .txt didn't supply them.
+        # They're ~3% low vs the device-authoritative .txt values (residual
+        # codec drift), so .txt always wins when present.
+        if binary_peaks is not None:
+            if binary_peaks.transverse_ips and not report_dict.get("tran_ppv"):
+                report_dict["tran_ppv"] = binary_peaks.transverse_ips
+            if binary_peaks.vertical_ips and not report_dict.get("vert_ppv"):
+                report_dict["vert_ppv"] = binary_peaks.vertical_ips
+            if binary_peaks.longitudinal_ips and not report_dict.get("long_ppv"):
+                report_dict["long_ppv"] = binary_peaks.longitudinal_ips
+
+        # 4. Build the typed IdfEvent.  Filename is authoritative for
        # (serial, timestamp, kind); the report's event_datetime takes
        # precedence over the filename timestamp inside from_report().
        idf_event = IdfEvent.from_report(report_dict, source_path.name)

+        # The binary mic peak (psi) isn't carried through from_report() —
+        # IdfReport.from_dict only sees the .txt's dB(L) value.  Pull the
+        # binary-derived ``mic_pspl_psi`` onto the typed IdfEvent so the
+        # downstream bridge can populate ``PeakValues.micl`` (psi-shaped)
+        # and the h5 writer's per-count mic factor lands at a sensible
+        # value.  Without this, the h5 mic chart auto-scales against the
+        # dB(L) value-as-pseudo-psi and renders ~flat.
+        if binary_peaks is not None and binary_peaks.mic_pspl_psi is not None:
+            idf_event.peaks.mic_pspl_psi = binary_peaks.mic_pspl_psi
+
        # Operator-supplied serial_hint wins over the binary's filename
        # prefix when both are present (e.g. callers passing a known-good
        # serial that overrides a misnamed export).
        serial = serial_hint or idf_event.serial or "UNKNOWN"

-        # Filesystem write.
+        # 5. Filesystem write of binary bytes.
        filename = source_path.name
        bw_path = self._serial_dir(serial) / filename
        bw_path.write_bytes(idf_bytes)
@@ -523,13 +595,59 @@ class WaveformStore:
        # surrogate — every distinct binary maps to a distinct row.
        waveform_key = bytes.fromhex(sha256)[:16]

-        # Bridge to minimateplus.Event for the existing sidecar / DB
+        # 6. Bridge to minimateplus.Event for the existing sidecar / DB
        # insert paths.  See IdfEvent.to_minimateplus_event() for the
        # caveats of this bridge (mic units, missing fields → sidecar).
        ev = idf_event.to_minimateplus_event(waveform_key)

-        # Write the sidecar.  Source kind "idf-import" was added to the
-        # allow-list in event_file_io.event_to_sidecar_dict for this.
+        # Attach the decoded sample arrays.  Thor's decoder counts use
+        # LSB = 0.0003 in/s for geo (vs BW's 16-count units at 0.005 in/s)
+        # — the .h5 writer's geo_range="normal" yields LSB = 10/32768
+        # ≈ 0.000305 in/s, so plotted samples come out ~1.7% high.
+        # Acceptable known offset; refine with a Thor-aware h5 path later.
+        if idf_samples is not None:
+            ev.raw_samples = idf_samples
+            n_samples = max((len(idf_samples.get(ch, [])) for ch in ("Tran", "Vert", "Long", "MicL")), default=0)
+            ev.total_samples = ev.total_samples or n_samples
+
+        # For IDFH histograms there are no per-sample waveform arrays — the
+        # device stores one peak ADC count per interval per channel.  Synthesise
+        # a 1-sample-per-interval array so the existing h5+renderer pipeline
+        # (which groups samples down to ``n_intervals`` bars via max-per-group)
+        # produces a non-blank histogram chart.  Each "sample" is the peak ADC
+        # count for that interval, so the h5 writer's ``count × geo_fs/32768``
+        # conversion yields the right physical value for the bar height.
+        if is_histogram and idf_intervals:
+            hist_samples = {
+                "Tran": [iv.peak_count("Tran") for iv in idf_intervals],
+                "Vert": [iv.peak_count("Vert") for iv in idf_intervals],
+                "Long": [iv.peak_count("Long") for iv in idf_intervals],
+                "MicL": [iv.peak_count("MicL") for iv in idf_intervals],
+            }
+            ev.raw_samples = hist_samples
+            ev.total_samples = ev.total_samples or len(idf_intervals)
+
+        # 7. Write the .h5 clean-waveform file when we have samples to write
+        # (either the IDFW per-sample stream, or the IDFH synthesised per-
+        # interval peak array).  The renderer treats both shapes the same way.
+        hdf5_filename: Optional[str] = None
+        if ev.raw_samples:
+            hdf5_path = self.hdf5_path_for(serial, filename)
+            try:
+                event_hdf5.write_event_hdf5(
+                    hdf5_path, ev,
+                    serial=serial,
+                    geo_range="normal",   # Thor's geo full scale is also 10 in/s (Normal)
+                    source_kind="idf-import",
+                )
+                hdf5_filename = hdf5_path.name
+            except Exception as exc:
+                log.warning(
+                    "save_imported_idf: HDF5 write failed for %s: %s — continuing without .h5",
+                    hdf5_path, exc,
+                )
+
+        # 8. Write the sidecar.  Source kind "idf-import" is on the allow-list.
        sidecar_path = self.sidecar_path_for(serial, filename)
        existing_review = None
        if sidecar_path.exists():
@@ -554,19 +672,67 @@ class WaveformStore:
        # Time of Peak, sensor self-check, calibration, firmware).
        if report_dict:
            sidecar["extensions"]["idf_report"] = report_dict
+
+        # Project the IDF report into the BW report sidecar shape so the
+        # existing Event Report PDF pipeline (sfm/report_pdf.py) can
+        # render Thor events without needing a separate code path.  Thor
+        # data is 95% the same metric set as BW — the adapter handles
+        # the field-name mapping.
+        if report_dict or binary_md is not None:
+            try:
+                from micromate.idf_to_bw_report import build_bw_report_from_idf
+                sidecar["bw_report"] = build_bw_report_from_idf(
+                    report_dict or {},
+                    binary_md=binary_md,
+                    intervals=idf_intervals,
+                    is_histogram=is_histogram,
+                )
+            except Exception as exc:
+                log.warning(
+                    "save_imported_idf: idf→bw_report adapter failed for %s: %s — "
+                    "report PDF will fall back to DB-only fields",
+                    filename, exc,
+                )
+        # For histograms, also stash the binary-decoded per-interval
+        # records so the UI / report layer doesn't need to re-walk the
+        # IDFH file at render time.
+        if idf_intervals is not None:
+            sidecar["extensions"]["idf_intervals"] = [
+                {
+                    "offset":     iv.offset,
+                    "tran_peak":  iv.peak_count("Tran"),
+                    "tran_halfp": iv.tran_halfp,
+                    "tran_freq":  iv.freq_hz("Tran"),
+                    "vert_peak":  iv.peak_count("Vert"),
+                    "vert_halfp": iv.vert_halfp,
+                    "vert_freq":  iv.freq_hz("Vert"),
+                    "long_peak":  iv.peak_count("Long"),
+                    "long_halfp": iv.long_halfp,
+                    "long_freq":  iv.freq_hz("Long"),
+                    "mic_peak":   iv.peak_count("MicL"),
+                    "mic_halfp":  iv.micl_halfp,
+                    "mic_freq":   iv.freq_hz("MicL"),
+                }
+                for iv in idf_intervals
+            ]
        event_file_io.write_sidecar(sidecar_path, sidecar)

        log.info(
            "WaveformStore.save_imported_idf serial=%s filename=%s filesize=%d "
-            "report_attached=%s",
-            serial, filename, filesize, bool(report_dict),
+            "kind=%s report_attached=%s binary_decoded=%s h5=%s intervals=%d",
+            serial, filename, filesize,
+            "histogram" if is_histogram else "waveform",
+            bool(report_dict),
+            (idf_samples is not None) or (idf_intervals is not None),
+            hdf5_filename or "(skipped)",
+            len(idf_intervals) if idf_intervals else 0,
        )
        return ev, {
            "filename":           filename,
            "filesize":           filesize,
            "sha256":             sha256,
            "a5_pickle_filename": None,
-            "hdf5_filename":      None,
+            "hdf5_filename":      hdf5_filename,
            "sidecar_filename":   sidecar_path.name,
            "serial":             serial,
        }
@@ -441,6 +441,40 @@ def test_real_oorange_event_t190_parses():
    assert r.channels["Long"].ppv_ips == pytest.approx(2.83)
    assert r.peak_vector_sum_saturated is True
    assert r.peak_vector_sum_time_s == pytest.approx(0.007)
+    # Same fixture: Tran ZC Freq is ">100 Hz" — must parse as 100 +
+    # above_range flag, not None (which would render as "—" on the PDF).
+    assert r.channels["Tran"].zc_freq_hz == 100.0
+    assert r.channels["Tran"].zc_freq_above_range is True
+    # Vert/Long are normal numeric values; flag stays False.
+    assert r.channels["Vert"].zc_freq_above_range is False
+    assert r.channels["Long"].zc_freq_above_range is False
+
+
+def test_above_range_marker_treated_as_zc_threshold():
+    """BW writes '>100 Hz' for ZC Freq when the zero-crossing algorithm
+    sees a peak too fast to count (cuts off at the device's 100 Hz
+    reporting ceiling).  Parser must store the threshold + flag, not
+    fall back to None.
+    """
+    txt = """\
+"Event Type : Full Waveform"
+"Serial Number : BE18190"
+"Tran ZC Freq : >100 Hz"
+"Vert ZC Freq : 73 Hz"
+"Long ZC Freq : N/A Hz"
+"MicL  ZC Freq : >100 Hz"
+"""
+    r = parse_report(txt)
+    assert r.channels["Tran"].zc_freq_hz == 100.0
+    assert r.channels["Tran"].zc_freq_above_range is True
+    assert r.channels["Vert"].zc_freq_hz == 73.0
+    assert r.channels["Vert"].zc_freq_above_range is False
+    # N/A → None, flag stays False
+    assert r.channels["Long"].zc_freq_hz is None
+    assert r.channels["Long"].zc_freq_above_range is False
+    # Mic above-range
+    assert r.mic.zc_freq_hz == 100.0
+    assert r.mic.zc_freq_above_range is True


 def test_real_histogram_fixture_populates_sensor_location():