The histogram-interval-times derivation block at line 314 references
rd.histogram_interval_size_s, but the field wasn't declared on the
ReportData dataclass — only the string form histogram_interval_size
was. Result: every PDF render of a histogram event raised
AttributeError → 500 from /db/events/{id}/report.pdf.
Cause: when the histogram aggregation block was inlined into
gather_report_data, the seconds-numeric counterpart that the
projection already carries (bw_report.histogram.interval_size_s) was
never wired into the dataclass. Waveform PDFs weren't affected
because the offending line is gated on is_histogram.
Fix: add the field, read it from the projection alongside the other
histogram keys. No-op for waveform events (the field stays None and
the gate skips it).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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