f/overrides/event-backup/apoix-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
2025-06-24,0.117000
2006-07-31,0.054000
2007-06-29,0.075000
2010-12-28,0.128000
2013-06-11,0.016000
2017-06-20,0.051000
2017-12-26,0.103000
2023-06-20,0.032000
2006-11-30,0.001000
2010-12-10,0.108000
2024-12-17,0.232000
2007-05-31,0.094000
2011-06-14,0.146000
2025-12-16,0.297000
2018-12-20,0.169000
2020-12-22,0.058000
2024-06-18,0.004000
2005-11-30,0.115000
2007-04-30,0.060000
2006-08-31,0.031000
2008-09-16,0.224000
2014-12-23,0.087000
2019-12-20,0.173000
2022-12-21,0.515000
2012-12-07,0.024000
2009-12-29,0.163000
2013-12-06,0.023000
2026-06-09,0.073000
2006-09-29,0.040000
2008-03-18,0.062000
2012-06-12,0.056000
2006-06-30,0.092000
2021-12-21,0.393000
2006-05-31,0.060000
2007-09-28,0.012000
2014-06-10,0.026000
2005-06-30,0.002000
2005-09-30,0.051000
2006-04-28,0.007000
2006-10-31,0.029000
2007-08-31,0.035000
2008-06-17,0.173000
2010-06-15,0.111000
2016-01-29,0.014000
2020-06-16,0.028000
2021-06-22,0.034000
2022-06-21,0.043000
2005-07-29,0.002000
2005-08-31,0.011000
2007-12-28,0.060000
2011-12-27,0.198000
2012-12-26,0.076000
2016-12-27,0.043000
2023-12-19,0.246000
2005-10-31,0.051000
2018-06-19,0.059000
2018-12-31,0.169000
2005-12-30,0.029000
2007-07-31,0.063000
2011-12-09,0.738000