f/overrides/event-backup/ijk-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
2009-06-23,0.031000
2014-06-24,0.073500
2014-12-24,0.126000
2017-03-24,0.098500
2023-12-20,0.269000
2014-09-24,0.086000
2016-03-23,0.097750
2020-06-15,0.100500
2002-03-11,0.005750
2003-12-16,0.012250
2006-06-23,0.014750
2007-09-26,0.018000
2013-09-24,0.080750
2022-06-09,0.150000
2024-03-21,0.145000
2025-03-18,0.120000
2002-12-16,0.011250
2003-09-15,0.014500
2013-06-26,0.107750
2017-09-26,0.116000
2021-03-25,0.091000
2023-03-23,0.195000
2007-06-29,0.018000
2012-09-25,0.060500
2016-06-21,0.101500
2019-03-20,0.150000
2019-12-16,0.188750
2019-06-17,0.150000
2024-06-11,0.137000
2024-09-25,0.224000
2004-03-29,0.017875
2005-06-21,0.025000
2008-03-25,0.021750
2013-03-25,0.049500
2018-03-22,0.112750
2017-06-27,0.112000
2018-12-17,0.130500
2021-12-13,0.134000
2001-06-11,0.002625
2006-03-27,0.022500
2006-12-21,0.020500
2012-03-26,0.043500
2016-09-26,0.143250
2022-12-13,0.192000
2005-03-28,0.039125
2013-12-23,0.094250
2017-12-19,0.176750
2020-09-23,0.128000
2002-06-17,0.005000
2003-03-10,0.010125
2014-03-25,0.078250
2025-06-16,0.148000
2026-03-17,0.102000
2010-12-23,0.053500
2011-12-22,0.056500
2012-12-19,0.126000
2001-12-17,0.003625
2009-09-23,0.020500
2010-03-25,0.022000
2010-06-23,0.031750
2010-09-24,0.035000
2023-09-26,0.263000
2024-12-17,0.211000
2025-09-16,0.165000
2026-06-15,0.134000
2015-03-25,0.106500
2021-06-10,0.082000
2022-03-24,0.149000
2003-12-15,0.015250
2004-12-27,0.021875
2005-12-23,0.021750
2006-09-27,0.018750
2008-12-24,0.042750
2022-09-26,0.248000
2005-09-26,0.023500
2012-06-19,0.052750
2016-12-21,0.181250
2000-12-13,0.058500
2018-09-26,0.168000
2020-12-14,0.153000
2023-06-07,0.168000
2015-09-25,0.105500
2015-12-24,0.145750
2018-06-26,0.129000
2001-03-12,0.001750
2007-12-27,0.029250
2008-06-24,0.028000
2011-03-25,0.030500
2011-06-23,0.035750
2019-09-24,0.161250
2008-09-25,0.018500
2009-03-25,0.013500
2015-06-24,0.092750
2025-12-16,0.208000
2011-09-26,0.040750
2020-03-25,0.126750
2021-09-24,0.118000
2001-10-02,0.005625
2003-06-16,0.012375
2004-06-28,0.015875
2004-09-27,0.017000
2007-03-26,0.113500
2002-09-16,0.037500
2009-12-24,0.054000