f/overrides/event-backup/iusg-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
2020-09-23,0.223000
2021-09-24,0.198000
2024-09-25,0.251000
2007-09-25,0.055500
2011-09-23,0.074500
2014-09-24,0.120000
2014-12-24,0.124000
2023-12-20,0.327000
2026-03-17,0.175000
2004-12-23,0.102000
2008-03-24,0.059000
2016-03-23,0.175500
2016-12-22,0.155000
2004-09-24,0.037500
2012-12-19,0.157500
2002-12-13,0.038500
2022-03-24,0.200000
2023-09-26,0.350000
2015-12-24,0.118500
2021-06-10,0.141000
2010-07-02,0.075500
2016-09-26,0.133000
2003-12-16,0.031500
2007-12-27,0.043500
2015-07-02,0.138000
2018-06-26,0.166000
2022-09-26,0.252000
2022-12-29,0.031000
2025-09-16,0.249000
2013-07-02,0.109500
2024-12-17,0.254000
2005-09-23,0.038000
2006-12-20,0.041500
2017-09-26,0.199000
2011-03-24,0.070000
2003-09-12,0.028000
2017-03-24,0.132000
2002-06-14,0.018500
2014-07-02,0.127500
2000-12-13,0.012500
2013-09-24,0.102500
2018-03-22,0.160000
2021-12-13,0.180000
2023-03-23,0.271000
2016-07-06,0.171000
2017-06-27,0.169000
2019-09-24,0.239000
2007-03-23,0.055000
2010-03-24,0.062000
2019-06-17,0.266000
2001-12-14,0.020000
2005-06-20,0.020500
2006-09-26,0.053000
2025-03-18,0.177000
2003-12-12,0.038500
2006-06-22,0.047000
2019-12-16,0.408000
2013-12-23,0.121500
2014-03-25,0.101500
2018-09-26,0.181000
2021-03-25,0.162000
2022-12-13,0.219000
2025-12-16,0.263000
2019-03-20,0.198000
2020-12-14,0.228000
2022-06-09,0.169000
2026-06-15,0.236000
2003-06-13,0.032500
2015-09-25,0.113500
2008-09-24,0.051000
2015-03-25,0.155000
2005-12-22,0.050500
2001-06-08,0.008500
2004-03-26,0.032500
2009-09-22,0.057500
2012-06-26,0.081500
2018-12-17,0.191000
2024-03-21,0.167000
2002-09-13,0.026500
2025-06-16,0.210000
2007-06-28,0.055500
2010-12-22,0.077000
2012-03-23,0.077000
2017-12-19,0.190000
2003-03-07,0.026000
2005-03-24,0.063500
2020-06-15,0.183000
2008-12-23,0.062500
2009-03-24,0.062500
2009-12-23,0.073500
2001-03-09,0.017000
2023-06-07,0.220000
2010-09-23,0.060500
2011-12-22,0.086500
2004-06-25,0.031500
2009-07-02,0.070500
2000-09-20,0.004000
2002-03-08,0.035500
2024-06-11,0.144000
2006-03-24,0.043500
2012-09-24,0.100500
2001-10-01,0.029000
2011-07-05,0.078500
2008-07-02,0.050500
2013-03-25,0.098500
2020-03-25,0.188000