f/overrides/event-backup/iwc-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
2008-12-23,0.142000
2007-03-23,0.062000
2017-07-06,0.248000
2021-12-13,0.543000
2023-09-26,0.428000
2008-09-24,0.092000
2018-07-03,0.227000
2019-09-24,0.345000
2015-03-25,0.245000
2012-09-24,0.232000
2016-03-23,0.196000
2017-12-21,0.408000
2019-06-17,0.240000
2019-12-16,0.355000
2021-09-24,0.273000
2025-03-18,0.278000
2009-03-24,0.072000
2012-12-19,0.478000
2026-03-17,0.245000
2011-12-22,0.219000
2010-12-22,0.194000
2011-07-05,0.150000
2011-09-23,0.122000
2013-09-24,0.159000
2016-09-26,0.176000
2018-12-17,0.200000
2023-06-07,0.269000
2006-06-22,0.056000
2017-03-24,0.193000
2017-09-26,0.196000
2013-12-23,0.296000
2008-03-24,0.047000
2008-07-02,0.136000
2010-07-02,0.095000
2011-03-24,0.049000
2012-06-26,0.185000
2022-03-24,0.113000
2024-03-21,0.254000
2005-12-22,0.085000
2020-03-25,0.272000
2023-03-23,0.275000
2024-09-25,0.418000
2010-09-23,0.071000
2015-12-24,0.382000
2016-12-22,0.316000
2024-06-11,0.326000
2006-03-24,0.022000
2014-03-25,0.149000
2021-03-25,0.161000
2022-12-13,0.379000
2024-12-17,0.378000
2026-06-15,0.515000
2007-09-25,0.132000
2007-06-28,0.101000
2013-07-02,0.189000
2014-09-24,0.173000
2019-03-20,0.240000
2020-06-15,0.222000
2022-06-09,0.290000
2023-12-20,0.387000
2006-12-20,0.138000
2025-09-16,0.398000
2009-07-02,0.075000
2009-09-22,0.053000
2010-03-24,0.048000
2012-03-23,0.126000
2015-09-25,0.196000
2006-09-26,0.084000
2015-07-02,0.252000
2018-03-22,0.189000
2018-09-26,0.216000
2020-09-23,0.303000
2021-06-10,0.116000
2014-12-24,0.289000
2013-03-25,0.117000
2020-12-14,0.371000
2025-12-16,0.733000
2007-12-27,0.123000
2009-12-23,0.121000
2014-07-02,0.247000
2016-07-06,0.306000
2022-09-26,0.487000
2025-06-16,0.324000
2005-09-23,0.011000