f/overrides/event-backup/hsbc-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
2014-10-22,0.500000
2024-11-08,0.500000
2025-05-09,0.500000
2003-11-25,0.600000
2009-05-20,0.400000
2018-08-16,0.500000
2019-10-10,0.500000
2022-08-18,0.450000
2024-08-16,0.500000
2005-08-17,0.700000
2008-11-19,0.900000
2012-08-15,0.450000
2019-08-15,0.500000
2022-03-10,0.900000
2026-05-15,0.500000
2005-11-22,0.700000
2011-11-22,0.450000
2017-02-22,1.050000
2025-03-07,1.800000
2011-05-18,0.450000
2013-08-21,0.500000
2002-08-21,0.139000
2003-08-20,1.200000
2004-03-17,1.200000
2008-05-21,0.900000
2009-03-18,0.500000
2010-05-19,0.400000
2016-10-19,0.500000
2019-02-21,1.050000
2023-11-09,0.500000
2026-08-14,0.500000
2020-02-27,1.050000
1999-08-18,0.739000
2000-03-15,1.150000
2007-11-20,0.850000
2016-05-18,0.500000
2018-02-22,1.050000
2019-05-16,0.500000
2024-03-07,1.550000
2002-03-20,1.611000
2005-05-18,0.700000
2006-05-17,0.750000
2009-11-18,0.400000
2012-10-24,0.450000
2013-05-22,0.500000
2004-08-18,0.650000
2008-08-20,0.900000
2011-08-17,0.450000
2014-05-21,0.500000
2021-03-11,0.750000
2023-08-10,0.500000
2000-08-16,0.833000
2001-08-22,1.056000
2006-03-22,1.550000
2008-03-20,1.950000
2010-03-17,0.500000
2017-08-02,0.500000
2026-03-13,2.250000
2007-03-21,1.800000
2015-03-04,1.000000
2015-08-12,0.500000
2018-05-17,0.500000
2025-08-15,0.500000
2025-11-07,0.500000
2023-03-02,1.150000
2003-03-19,1.806000
2004-11-23,0.650000
2005-03-16,1.350000
2015-05-20,0.500000
2016-08-10,0.500000
2017-10-12,0.500000
2001-03-14,1.583000
2006-08-16,0.750000
2021-08-19,0.350000
2010-08-18,0.400000
2010-11-17,0.400000
2011-03-16,0.600000
2013-10-23,0.500000
2014-03-12,0.950000
2017-05-17,0.500000
2004-05-19,0.650000
2007-05-16,0.850000
2023-05-11,0.500000
2024-05-09,1.550000
2006-11-21,0.750000
2012-05-16,0.450000
2013-03-20,0.900000
2018-10-11,0.500000
2007-08-15,0.850000
2009-08-19,0.400000
2012-03-14,0.700000
2014-08-20,0.500000
2015-10-21,0.500000
2016-03-02,1.000000