f/overrides/event-backup/ddvax-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
2025-09-22,0.042000
2009-12-22,0.189000
2013-03-22,0.053000
2015-09-22,0.073000
2020-03-20,0.108000
2023-03-22,0.067000
2024-06-21,0.051000
2025-06-20,0.039000
2018-06-22,0.072000
2025-03-21,0.048000
2026-06-22,0.004000
2026-03-20,0.031000
2011-12-22,0.194000
2013-06-21,0.053000
2015-06-22,0.071000
2016-09-22,0.072000
2018-03-22,0.086000
2020-06-22,0.081000
2020-09-22,0.093000
2006-12-21,0.415000
2008-12-22,0.254000
2012-12-21,0.170000
2015-12-22,0.323000
2018-09-21,0.085000
2022-09-22,0.085000
2021-12-17,5.020000
2023-09-22,0.077000
2014-03-21,0.063000
2015-03-20,0.063000
2019-12-19,0.771000
2021-09-22,0.095000
2023-12-18,1.744000
2024-09-20,0.066000
2023-06-22,0.073000
2004-12-22,0.452000
2016-03-22,0.068000
2016-12-22,0.232000
2017-03-22,0.072000
2021-03-22,0.096000
2013-12-20,0.051000
2014-09-22,0.064000
2017-06-22,0.083000
2022-03-22,0.067000
2024-12-16,4.223000
2010-12-22,0.179000
2013-09-20,0.065000
2014-12-22,0.061000
2021-06-22,0.057000
2025-12-15,3.132000
1998-12-29,0.037000
2007-12-21,0.889000
2014-06-20,0.059000
2016-06-22,0.076000
2019-06-21,0.087000
2019-09-20,0.093000
2022-12-16,1.701000
1999-12-22,0.070000
2024-03-22,0.046000
2005-12-22,0.193000
2017-09-22,0.057000
2018-12-21,0.963000
2019-03-22,0.087000
2003-12-22,0.094000
2017-12-22,0.601000
2020-12-18,0.234000
2022-06-22,0.050000