f/overrides/event-backup/ifn-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
2008-12-29,0.670000
2013-10-01,0.062000
2021-12-17,0.800000
2024-05-30,0.450000
2014-09-18,0.128000
2024-08-23,0.490000
2025-02-21,0.460000
2005-12-28,4.460000
2016-12-28,1.490000
2017-12-28,2.834000
2021-12-29,0.640000
2023-08-23,0.410000
2004-12-29,1.520000
2010-09-29,0.090000
2018-12-28,2.323000
2020-03-19,0.570000
2020-12-18,0.500000
2022-11-21,1.610000
2001-12-19,0.070000
2014-12-29,1.735000
2022-08-23,0.460000
2025-08-22,0.430000
2016-09-19,0.216000
2021-09-17,0.610000
2022-03-23,0.580000
2025-11-21,0.400000
2003-12-26,0.130000
2006-10-02,0.590000
2008-10-07,6.450000
2015-12-29,1.429000
2018-06-20,0.710000
2022-05-19,0.530000
2018-04-19,0.760000
2020-06-18,0.420000
2021-06-22,0.580000
2026-02-20,0.450000
2026-08-24,0.370000
2006-04-12,1.070000
2007-10-02,1.430000
2011-09-29,0.880000
2012-12-19,2.371000
2019-09-20,0.580000
2013-12-27,0.890000
2015-09-17,0.395000
2023-02-17,0.430000
2018-09-21,0.710000
2019-03-20,0.590000
2019-12-30,0.570000
2023-11-21,0.410000
2026-05-21,0.390000
2010-12-29,3.780000
2011-12-28,0.320000
2019-06-20,0.590000
2006-12-27,3.460000
2007-12-27,8.180000
2021-03-23,0.580000
2023-05-18,0.390000
2024-02-21,0.430000
2002-12-27,0.085000
2017-09-21,0.329000
2020-09-18,0.460000
2024-11-21,0.930000
2025-05-22,0.410000