f/overrides/event-backup/iyw-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
2013-12-23,0.067750
2016-03-23,0.099750
2017-09-26,0.085250
2018-12-17,0.085250
2020-09-23,0.104500
2024-03-21,0.079000
2026-03-17,0.070000
2004-12-23,0.174500
2006-06-22,0.011250
2007-03-23,0.007500
2007-06-28,0.013250
2008-09-24,0.012000
2015-03-25,0.071000
2017-12-19,0.078250
2011-09-23,0.025250
2012-03-26,0.025250
2014-03-25,0.061000
2018-06-26,0.095500
2020-12-14,0.078000
2007-12-27,0.004500
2011-12-22,0.027500
2013-09-24,0.061500
2016-12-21,0.081750
2019-06-17,0.114000
2022-09-26,0.114000
2007-09-25,0.006750
2008-03-25,0.014000
2011-06-24,0.028000
2013-06-26,0.056500
2025-12-16,0.055000
2006-03-24,0.031750
2012-06-19,0.030750
2005-03-24,0.009750
2013-03-25,0.049500
2014-09-24,0.069750
2019-12-16,0.091500
2024-06-11,0.080000
2025-09-16,0.060000
2026-06-15,0.072000
2022-06-09,0.076000
2008-06-25,0.013750
2009-03-25,0.016750
2017-03-24,0.088000
2018-03-22,0.091750
2019-09-24,0.110250
2021-03-25,0.094000
2021-09-24,0.073000
2009-06-24,0.020250
2010-03-25,0.015000
2010-09-23,0.016500
2016-09-26,0.081750
2023-09-26,0.089000
2024-12-17,0.066000
2025-06-16,0.086000
2009-12-23,0.013000
2010-06-24,0.018750
2011-03-25,0.016250
2015-06-24,0.063250
2019-03-20,0.101250
2021-06-10,0.077000
2023-03-23,0.101000
2006-09-26,0.004750
2010-12-22,0.018500
2014-12-24,0.093750
2015-09-25,0.078500
2020-03-25,0.181250
2022-03-24,0.039000
2014-06-24,0.070750
2015-12-24,0.086500
2022-12-13,0.147000
2023-12-20,0.393000
2009-09-22,0.015250
2021-12-13,0.115000
2024-09-25,0.107000
2025-03-18,0.075000
2005-06-20,0.008750
2006-12-20,0.003250
2008-12-23,0.018000
2017-06-27,0.082250
2020-06-15,0.110750
2012-09-25,0.042250
2012-12-19,0.068500
2016-06-21,0.077750
2018-09-26,0.093250
2023-06-07,0.068000