f/overrides/event-backup/cusex-dividend.csv
Greg Pomerantz bb8e39605e Event-history protection: backup dir, empty-download fallback, docs
Yahoo's 2026 event-feed change (capitalGain events dropped for some
funds; no events at all for terminated tickers) can wipe good event
history on re-download. Defense in depth:

- overrides/event-backup/: last-known-good copy of every dividend/
  capitalGain file (8,192 files, 58 MB); refresh with
  scripts/backup_events.py after each dump update
- data.py event_file(): frozen > data-root (while populated) > backup;
  used by panel reads, verify_official, and the double-listing scanner
- README: capital-gain files are mutual-fund-only in this dump; Yahoo
  has no LT/ST split (tax.py taxes capg at lt_rate; the per-fund split
  would come from fund-company annual tax statements or commercial feeds)
- tests: exact Timestamp .loc keys (pandas 3.x string matching returns a
  Series on large DatetimeIndex)
2026-08-31 21:59:25 -04:00

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Date,Dividends
2020-09-29,0.066000
2021-12-13,1.597000
2022-06-28,0.080000
2023-12-11,1.709000
2019-06-27,0.091000
2012-12-28,0.084000
2014-06-27,0.059000
2014-09-29,0.084000
2016-12-29,0.921000
2018-03-28,0.084000
2019-03-28,0.076000
2019-12-16,0.871000
2011-09-29,0.041000
2024-09-27,0.071000
2014-12-11,0.713000
2015-12-29,0.757000
2018-06-28,0.060000
2019-09-27,0.082000
2020-03-30,0.078000
2013-03-27,0.040000
2018-12-28,1.566000
2022-03-29,0.077000
2025-06-27,0.075000
2012-12-13,0.008000
2012-09-27,0.051000
2013-06-27,0.051000
2023-03-30,0.094000
2024-06-27,0.081000
2026-03-30,0.094000
2012-06-28,0.041000
2016-06-29,0.072000
2025-09-29,0.093000
2012-03-29,0.034000
2015-06-29,0.073000
2016-03-30,0.077000
2016-09-29,0.075000
2022-12-12,0.813000
2025-12-15,3.198000
2026-06-29,0.067000
2011-12-29,0.047000
2017-03-30,0.072000
2015-03-30,0.042000
2013-12-12,0.281000
2020-06-29,0.061000
2021-09-28,0.068000
2024-03-27,0.079000
2024-12-16,3.004000
2011-06-29,0.048000
2015-09-29,0.063000
2022-09-28,0.090000
2025-03-28,0.068000
2014-03-28,0.037000
2018-09-27,0.075000
2013-09-27,0.046000
2014-12-30,0.061000
2021-03-29,0.067000
2013-12-30,0.058000
2017-06-29,0.078000
2017-12-28,1.142000
2020-12-14,0.626000
2023-06-29,0.093000
2011-12-15,0.822000
2021-06-28,0.068000
2023-09-28,0.095000
2017-09-28,0.091000