f/overrides/event-backup/aigox-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
2019-03-13,0.066000
2021-03-10,0.066000
2023-03-09,0.160000
1988-12-29,0.095000
1996-05-15,0.329000
2007-05-16,0.092000
2012-05-08,0.170000
2014-06-17,0.075000
2023-12-14,0.953000
2026-03-12,0.071000
2016-12-14,0.100000
2017-12-15,0.083000
2018-06-13,0.100000
2020-03-11,0.072000
1992-04-29,0.126000
1999-05-06,0.026000
2017-09-12,0.070000
2020-12-16,0.200000
2024-09-05,0.089000
2001-05-29,0.044000
2005-05-17,0.109000
2006-05-17,0.131000
2012-09-18,0.050000
2022-12-15,1.778000
1997-05-29,0.044000
1998-05-29,0.042000
2021-12-15,2.239000
2020-09-09,0.065000
2021-09-08,0.074000
1994-05-09,0.147000
2013-09-17,0.063000
2015-06-16,0.070000
2016-03-15,0.075000
2018-09-12,0.075000
2009-05-13,0.199000
2012-12-18,0.116000
2020-06-10,0.068000
2022-03-10,0.068000
2024-06-06,0.040000
2018-12-18,1.313000
2024-03-07,0.054000
2025-03-13,0.225000
1993-04-29,0.055000
2013-12-18,0.077000
2014-12-18,0.090000
2015-03-17,0.060000
2015-09-15,0.070000
2013-06-18,0.063000
2017-03-14,0.070000
2025-06-12,0.102000
2022-06-09,0.082000
2026-06-11,0.046000
2022-09-08,0.096000
1995-05-04,0.155000
2003-05-30,0.026000
2015-12-16,0.080000
2016-06-14,0.075000
2019-06-12,0.085000
1991-04-18,0.092000
2004-05-28,0.050000
2012-06-19,0.050000
2017-06-13,0.075000
2019-09-11,0.085000
2024-12-12,0.113000
1990-04-17,0.100000
2016-09-13,0.055000
2023-09-07,0.066000
2025-09-11,0.073000
2025-12-17,4.568000
2000-05-24,0.005000
2019-12-18,2.107000
2021-06-09,0.079000
2008-05-14,0.214000
2013-03-19,0.063000
2014-03-18,0.102000
2014-09-16,0.075000
2018-03-14,0.075000