f/overrides/event-backup/hiaox-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
1991-06-28,0.200000
2009-12-17,0.184000
2012-08-17,0.230000
1993-09-30,0.140000
2000-12-29,1.100000
2021-08-27,0.212000
1990-12-31,0.030000
1992-04-30,0.150000
1993-07-30,0.030000
1992-05-29,0.480000
1995-11-30,0.150000
1996-10-31,0.300000
1994-04-29,0.160000
1996-05-31,0.600000
2001-06-28,16.220000
2003-06-26,0.012000
1991-05-31,0.410000
1992-12-31,0.040000
1993-04-30,0.120000
1994-10-31,0.090000
1995-09-29,0.160000
2014-08-27,0.335000
1995-07-31,0.100000
1996-01-31,3.740000
2003-12-29,0.069000
2015-08-19,0.215000
1991-12-31,0.030000
1994-08-31,0.080000
1994-09-30,0.110000
1995-02-28,0.040000
1995-08-31,0.070000
1997-04-30,0.120000
2008-06-23,0.007000
2023-08-25,0.173000
1990-11-30,0.710000
1991-09-30,0.090000
1994-07-29,0.150000
1996-07-31,0.100000
1996-08-30,0.260000
2004-06-29,0.012000
2006-12-13,0.225000
2016-08-25,0.230000
1992-06-30,0.150000
1992-09-30,0.150000
1993-03-31,0.050000
1995-01-31,1.180000
1998-12-31,1.720000
1999-12-28,1.680000
1992-07-31,0.230000
1994-02-28,0.110000
1994-03-31,0.180000
2004-08-26,0.045000
2007-12-17,0.191000
2013-08-13,0.293000
2017-08-24,0.235000
2019-08-27,0.922000
1993-05-28,0.210000
1993-06-30,0.270000
1997-02-28,10.420000
1994-06-30,0.190000
1996-09-30,0.160000
1990-09-28,0.020000
1990-10-31,0.200000
1993-12-31,0.050000
1992-08-31,0.030000
1992-11-30,0.050000
1993-11-30,0.050000
1996-03-29,0.230000
2000-06-30,20.480000
1990-07-31,0.310000
1990-08-31,0.130000
1991-07-31,0.210000
2006-06-22,0.180000
2025-08-25,0.468000
1995-04-28,0.190000
1995-10-31,0.100000
1995-12-29,0.130000
1996-04-30,0.190000
2004-12-15,0.067000
1991-01-31,0.010000
1992-03-31,0.040000
1994-05-31,0.210000
2011-08-26,0.006000
1998-02-26,8.850000
1999-02-26,0.130000
2020-08-27,0.317000
1991-02-28,0.020000
1995-03-31,0.140000
1996-11-29,0.170000
1996-12-31,0.150000
2009-08-27,0.010000
2018-08-23,0.324000
2024-08-23,0.251000
1994-11-30,0.110000
1995-06-30,0.400000
1996-06-28,0.350000
1997-12-31,1.080000
2008-12-16,0.273000
2022-08-26,3.326000
1991-03-28,0.090000
1994-12-30,0.220000
1995-05-31,0.360000