f/overrides/event-backup/iez-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
2014-06-24,0.228000
2022-06-09,0.037000
2023-12-20,0.064000
2008-12-23,0.047000
2011-09-23,0.044000
2013-03-25,0.080000
2014-12-24,0.234000
2016-09-26,0.093000
2017-12-19,0.088000
2022-03-24,0.026000
2009-09-22,0.055000
2009-12-23,0.135000
2017-09-26,0.976000
2019-12-16,0.124000
2020-09-23,0.058000
2021-09-24,0.023000
2024-03-21,0.087000
2011-03-25,0.031000
2012-09-25,0.075000
2016-12-21,0.080000
2017-06-27,0.080000
2023-03-23,0.065000
2023-06-07,0.012000
2014-09-24,0.202000
2016-06-21,0.099000
2013-06-26,0.124000
2019-03-20,0.109000
2020-03-25,0.116000
2007-09-25,0.006000
2010-12-22,0.129000
2015-06-24,0.201000
2020-06-15,0.034000
2024-06-11,0.092000
2025-09-16,0.111000
2008-09-24,0.003000
2012-06-19,0.083000
2016-03-23,0.141000
2018-06-26,0.085000
2019-06-17,0.112000
2021-06-10,0.018000
2021-12-13,0.033000
2006-09-26,0.004000
2009-03-25,0.067000
2020-12-14,0.026000
2021-03-25,0.080000
2010-06-24,0.054000
2019-09-24,0.117000
2017-03-24,0.082000
2018-12-17,0.089000
2010-03-25,0.063000
2015-09-25,0.202000
2006-12-20,0.013000
2010-09-23,0.034000
2018-03-22,0.107000
2025-03-18,0.090000
2007-03-23,0.063000
2009-06-24,0.054000
2013-12-23,0.136000
2015-12-24,0.182000
2022-09-26,0.036000
2006-06-22,0.014000
2011-12-22,0.039000
2013-09-24,0.146000
2015-03-25,0.272000
2023-09-26,0.071000
2024-09-25,0.093000
2024-12-17,0.077000
2008-03-25,0.002000
2012-12-19,0.107000
2022-12-13,0.039000
2025-06-16,0.104000
2025-12-16,0.084000
2011-06-24,0.051000
2012-03-26,0.059000
2014-03-25,0.175000
2018-09-26,0.088000
2026-03-17,0.064000
2026-06-15,0.085000
2007-06-28,0.020000
2008-06-25,0.027000