f/overrides/event-backup/iwx-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
2023-06-07,0.301000
2024-12-17,0.516000
2017-03-24,0.268000
2013-07-02,0.167000
2013-12-23,0.222000
2014-09-24,0.252000
2017-07-06,0.290000
2018-12-17,0.383000
2021-09-24,0.336000
2025-06-16,0.388000
2012-06-26,0.201000
2012-03-23,0.228000
2016-12-22,0.269000
2018-09-26,0.288000
2020-12-14,0.318000
2011-12-22,0.206000
2014-07-02,0.276000
2014-03-25,0.199000
2011-09-23,0.175000
2013-03-25,0.166000
2019-12-16,0.531000
2010-09-23,0.124000
2022-12-13,0.380000
2025-09-16,0.390000
2017-12-21,0.290000
2018-07-03,0.308000
2019-03-20,0.278000
2022-03-24,0.313000
2012-09-24,0.183000
2011-07-05,0.196000
2015-03-25,0.238000
2017-09-26,0.263000
2023-09-26,0.433000
2010-07-02,0.141000
2019-09-24,0.367000
2012-12-19,0.231000
2013-09-24,0.207000
2016-07-06,0.279000
2021-06-10,0.277000
2024-09-25,0.342000
2010-12-22,0.159000
2021-12-13,0.354000
2024-06-11,0.350000
2025-12-16,0.398000
2026-03-17,0.364000
2010-03-24,0.086000
2015-07-02,0.386000
2015-12-24,0.287000
2016-03-23,0.252000
2020-03-25,0.304000
2020-06-15,0.308000
2026-06-15,0.380000
2014-12-24,0.247000
2022-09-26,0.407000
2009-12-23,0.145000
2015-09-25,0.243000
2022-06-09,0.246000
2023-03-23,0.311000
2023-12-20,0.448000
2011-03-24,0.135000
2018-03-22,0.291000
2019-06-17,0.344000
2021-03-25,0.288000
2024-03-21,0.347000
2025-03-18,0.288000
2016-09-26,0.246000
2020-09-23,0.298000