Three layered changes that together make histogram charts visually
match BW's printout (one bar per interval, not per codec block):
1. bw_ascii_report parser captures histogram fields it previously
dropped:
- Histogram Start/Stop Time + Date → datetime
- Number of Intervals + Interval Size (string + parsed seconds)
- <Channel> Peak Time + Peak Date → datetime (per-channel)
- Peak Vector Sum Date (combined with PVS Time → datetime;
clears the bogus seconds parse that interpreted "22:33:52"
as 22.0)
New _parse_iso_date() handles BW's ISO format for histograms
(waveforms use "May 8, 2026" long form). New _parse_interval_size()
handles "1 minute" / "5 minutes" / "15 seconds" etc.
2. _bw_report_to_dict() projects the new fields into a new
bw_report.histogram block in the sidecar.
3. /db/events/{id}/waveform.json wraps the existing path 1 (HDF5)
output with _maybe_aggregate_histogram(): when the event is a
histogram AND the sidecar has bw_report.histogram.n_intervals,
group the codec's per-block samples into N intervals via
max-per-group and return the aggregated array. time_axis gains
histogram_aggregated / n_intervals / interval_size_s / interval_times
fields.
Frontend (both modal chart in sfm_webapp.html + standalone event
browser) uses interval_times as x-axis labels when provided (BW-style
HH:MM:SS), falls back to interval index.
Defensive: aggregation is no-op when the sidecar lacks the histogram
block (events ingested before this change). Activates automatically
on prod once a watcher re-forward populates new sidecars.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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