f/overrides/event-backup/cost-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
2024-02-01,1.020000
2009-10-21,0.180000
2017-05-08,7.000000
2019-08-29,0.650000
2020-02-06,0.650000
2020-07-30,0.700000
2023-12-27,15.000000
2005-08-03,0.115000
2010-02-10,0.180000
2011-05-11,0.240000
2012-05-23,0.275000
2021-02-04,0.700000
2020-10-29,0.700000
2004-11-03,0.100000
2006-02-07,0.115000
2008-02-13,0.145000
2014-02-12,0.310000
2017-05-10,0.500000
2019-10-31,0.650000
2008-08-06,0.160000
2012-11-14,0.275000
2014-07-09,0.355000
2016-11-02,0.450000
2023-08-24,1.020000
2025-05-02,1.300000
2009-02-11,0.160000
2012-08-08,0.275000
2018-08-30,0.570000
2019-05-09,0.650000
2021-04-29,0.790000
2026-01-30,1.300000
2026-07-24,1.470000
2004-07-21,0.100000
2010-05-05,0.205000
2012-02-08,0.240000
2015-08-12,0.400000
2016-08-10,0.450000
2017-02-08,0.450000
2014-05-14,0.355000
2014-11-12,0.355000
2015-11-10,0.400000
2018-05-10,0.570000
2019-02-07,0.570000
2012-12-06,7.000000
2013-02-06,0.275000
2016-04-27,0.450000
2022-10-27,0.900000
2005-11-16,0.115000
2013-05-15,0.310000
2015-02-11,0.355000
2021-10-28,0.790000
2022-07-28,0.900000
2024-11-01,1.160000
2016-02-10,0.400000
2017-08-16,0.500000
2005-05-04,0.115000
2006-11-15,0.130000
2007-04-25,0.145000
2010-08-04,0.205000
2013-08-07,0.310000
2015-02-05,5.000000
2023-02-02,0.900000
2024-04-25,1.160000
2006-07-28,0.130000
2011-08-03,0.240000
2015-04-29,0.400000
2017-11-16,0.500000
2018-11-08,0.570000
2023-05-04,1.020000
2018-02-15,0.500000
2020-12-01,10.000000
2021-07-29,0.790000
2022-04-28,0.900000
2008-05-14,0.160000
2009-05-13,0.180000
2009-08-12,0.180000
2022-02-03,0.790000
2025-02-07,1.160000
2007-07-25,0.145000
2011-02-09,0.205000
2011-11-08,0.240000
2023-11-02,1.020000
2025-10-31,1.300000
2010-10-27,0.205000
2013-11-13,0.310000
2004-05-06,0.100000
2005-02-04,0.100000
2006-05-08,0.130000
2007-02-12,0.130000
2007-11-28,0.145000
2008-11-12,0.160000
2020-04-30,0.700000
2024-07-26,1.160000
2025-08-01,1.300000
2026-05-01,1.470000