IA-footer archived timestamps (footer-extracted from photorobot.<hash>.js.download)
Observation window: 2022-11-01 .. 2023-01-31 CST (92 days)
Total records with footer timestamp in window: 816
Distinct days with ≥1 record:                  15 / 92
Uniform-null expected per-day count:            8.87

Top 10 CST dates by record count:
  2022-12-08: 248
  2022-12-06: 209
  2022-12-09: 137
  2022-12-28: 68
  2022-12-11: 57
  2022-12-12: 26
  2022-12-30: 24
  2022-12-10: 18
  2023-01-04: 13
  2022-12-29: 5

Share of records on top-N days:
  top-1 day  : 248/816 = 30.4%
  top-3 days : 594/816 = 72.8%
  top-5 days : 719/816 = 88.1%

Burstiness coefficient B = (σ-μ)/(σ+μ)
  over full 92-day window (counting zero-days): B = 0.614  (0.0 = Poisson, 1.0 = maximal burst)
  over non-zero days only:                       B = 0.173

Collector activity timestamps (CST):
  2022-12-09 02:45 account created (PatentlyFalse)
  2022-12-09 03:05 bulk capture begin
  2022-12-09 04:46 documented real-time event

Collector CSV (all 13 files): n=1110
  rows with jsArchiveDate BEFORE collector account creation (2022-12-09 02:45 CST): 560
  rows with |jsArchiveDate - savedOnDate| within 1h  : 0
  rows with |jsArchiveDate - savedOnDate| within 6h  : 0
  rows with |jsArchiveDate - savedOnDate| within 24h : 15
  rows with jsArchiveDate on one of the 5 cluster dates (CST): sum = 685
    2022-12-06: 210
    2022-12-08: 52
    2022-12-09: 329
    2022-12-12: 26
    2022-12-28: 68

Delta (jsArchiveDate - savedOnDate), n=1110:
  p5:  -5582.21 h
  p25: -1518.93 h
  p50: -605.75 h
  p75: -184.85 h
  p95: -98.95 h
  negative (js before saved): 1110/1110 = 100.0%

Before-vs-after 04:46 CST on Dec-9 captures:
  before_0446: n=146  p25=-3.96h  p50=-3.95h  p75=-3.93h  max=3.19h
  after_0446: n=33  p25=1.68h  p50=1.68h  p75=2.82h  max=2.84h
