f/overrides/event-backup/dhgax-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
2015-09-30,0.092000
2016-12-30,0.444000
2017-03-31,0.176000
2010-06-30,0.179000
2011-06-30,0.135000
2011-12-29,0.488000
2013-06-28,0.138000
2015-03-31,0.204000
2026-03-31,0.015000
2020-03-31,0.022000
2020-12-30,0.482000
2022-03-31,0.076000
2024-06-28,0.043000
2024-12-31,0.540000
2014-03-31,0.106000
2022-09-30,0.110000
2024-03-28,0.026000
2010-03-31,0.221000
2010-12-30,0.612000
2011-03-31,0.068000
2012-12-28,0.666000
2013-09-30,0.074000
2024-09-30,0.044000
2025-06-30,0.081000
2010-04-30,0.021000
2019-12-31,0.089000
2013-03-28,0.138000
2021-09-30,0.038000
2012-06-29,0.055000
2014-12-31,0.746000
2018-09-28,0.170000
2018-12-31,0.589000
2025-09-30,0.089000
2025-03-31,0.062000
2025-12-31,0.422000
2026-06-30,0.084000
2010-09-30,0.065000
2014-09-30,0.095000
2017-06-30,0.077000
2020-06-30,0.022000
2023-12-20,0.348000
2017-12-29,0.272000
2011-09-30,0.103000
2012-09-28,0.075000
2013-12-30,0.288000
2014-06-30,0.089000
2015-12-31,0.189000
2012-03-30,0.036000
2015-06-30,0.049000
2021-03-31,0.238000
2021-12-22,0.895000
2022-12-21,0.614000