f/overrides/event-backup/dgx-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
2012-06-29,0.170000
2015-01-09,0.330000
2021-01-19,0.560000
2022-01-18,0.620000
2017-01-06,0.450000
2019-07-05,0.530000
2020-10-05,0.560000
2022-04-05,0.660000
2009-01-07,0.100000
2010-01-05,0.100000
2010-09-30,0.100000
2011-06-30,0.100000
2020-01-13,0.530000
2006-01-09,0.090000
2014-07-07,0.330000
2015-04-06,0.380000
2019-10-03,0.530000
2012-09-27,0.170000
2015-07-06,0.380000
2021-07-06,0.620000
2008-10-01,0.100000
2009-04-02,0.100000
2019-01-14,0.530000
2026-01-13,0.800000
2017-07-06,0.450000
2025-07-07,0.800000
2004-07-02,0.075000
2005-07-06,0.090000
2011-01-06,0.100000
2016-01-08,0.380000
2017-10-02,0.450000
2018-10-04,0.500000
2019-04-05,0.530000
2012-03-30,0.170000
2018-01-08,0.450000
2024-10-04,0.750000
2025-01-14,0.750000
2015-10-02,0.380000
2020-07-07,0.560000
2021-04-06,0.620000
2010-07-01,0.100000
2011-10-05,0.100000
2013-06-28,0.300000
2013-09-27,0.300000
2005-01-07,0.075000
2008-01-07,0.100000
2009-07-01,0.100000
2022-10-03,0.660000
2014-10-03,0.330000
2016-07-01,0.400000
2016-09-30,0.400000
2023-01-17,0.660000
2006-07-05,0.100000
2006-10-02,0.100000
2007-04-02,0.100000
2014-04-04,0.330000
2018-04-03,0.500000
2021-10-04,0.620000
2022-07-05,0.660000
2023-10-05,0.710000
2004-04-05,0.075000
2004-10-06,0.075000
2005-10-03,0.090000
2007-01-08,0.100000
2016-04-04,0.400000
2024-07-08,0.750000
2008-04-02,0.100000
2008-07-01,0.100000
2010-04-01,0.100000
2012-01-05,0.170000
2014-01-03,0.300000
2018-07-06,0.500000
2020-04-06,0.560000
2023-04-06,0.710000
2006-04-03,0.100000
2009-09-30,0.100000
2011-04-01,0.100000
2013-01-09,0.300000
2024-01-16,0.710000
2026-04-06,0.860000
2013-03-28,0.300000
2017-04-03,0.450000
2023-07-10,0.710000
2024-04-05,0.750000
2025-04-07,0.800000
2025-10-03,0.800000
2026-07-08,0.860000
2004-01-06,0.075000
2005-04-04,0.090000
2007-07-02,0.100000
2007-10-01,0.100000