f/overrides/event-backup/ieo-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
2007-06-28,0.025000
2009-09-22,0.068000
2011-03-25,0.150000
2013-09-24,0.155000
2015-09-25,0.287000
2019-09-24,0.253000
2022-12-13,1.136000
2024-06-11,0.505000
2012-12-19,0.148000
2016-06-21,0.173000
2017-12-19,0.158000
2021-09-24,0.566000
2022-06-09,0.575000
2007-09-25,0.049000
2017-03-24,0.129000
2023-12-20,0.968000
2009-06-24,0.066000
2012-03-26,0.099000
2013-06-26,0.213000
2023-06-07,0.547000
2023-09-26,0.499000
2009-03-25,0.036000
2011-06-24,0.052000
2014-09-24,0.236000
2024-03-21,0.594000
2025-09-16,0.637000
2010-12-29,0.007000
2011-09-23,0.065000
2015-03-25,0.261000
2016-09-26,0.156000
2016-12-21,0.137000
2017-06-27,0.172000
2018-06-26,0.168000
2020-09-23,0.426000
2008-03-25,0.034000
2008-12-23,0.096000
2010-09-23,0.047000
2025-03-18,0.533000
2026-06-15,0.505000
2006-12-20,0.035000
2012-09-25,0.130000
2022-03-24,0.570000
2007-03-23,0.029000
2015-12-24,0.251000
2017-09-26,0.154000
2018-09-26,0.173000
2021-12-13,0.566000
2025-12-16,0.636000
2008-06-25,0.024000
2014-12-24,0.262000
2016-03-23,0.178000
2020-03-25,0.300000
2021-03-25,0.260000
2021-06-10,0.211000
2022-09-26,1.223000
2006-06-22,0.025000
2010-03-25,0.036000
2014-06-24,0.214000
2020-06-15,0.191000
2010-12-22,0.042000
2019-12-16,0.307000
2014-03-25,0.215000
2015-06-24,0.277000
2023-03-23,0.785000
2024-12-17,0.527000
2009-12-23,0.066000
2011-12-22,0.110000
2019-03-20,0.229000
2019-06-17,0.238000
2024-09-25,0.727000
2026-03-17,0.553000
2008-09-24,0.066000
2012-06-19,0.117000
2013-12-23,0.191000
2018-03-22,0.180000
2020-12-14,0.221000
2025-06-16,0.526000
2006-09-26,0.029000
2007-12-27,0.047000
2010-06-24,0.047000
2013-03-25,0.163000
2018-12-17,0.340000