f/overrides/event-backup/demsx-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
2012-06-08,0.115000
2017-06-29,0.065000
2023-03-30,0.013000
2023-09-28,0.218000
2002-12-16,0.134000
2004-12-20,0.509000
2010-03-09,0.012000
2010-09-08,0.115000
2024-03-27,0.020000
2001-12-17,0.036000
2013-12-12,0.513000
2016-03-30,0.055000
2020-06-29,0.054000
2017-12-15,0.892000
2008-03-10,0.010000
2010-12-09,0.864000
2011-06-08,0.153000
2011-09-08,0.138000
2016-12-15,0.708000
2021-12-15,1.337000
2023-06-29,0.133000
2025-09-29,0.302000
1998-12-21,0.036000
2004-06-08,0.047000
2005-12-19,0.355000
2013-09-10,0.108000
2024-06-27,0.119000
2025-03-28,0.024000
2025-12-15,0.502000
2015-12-16,0.375000
2018-12-18,0.753000
2019-12-17,0.406000
2020-12-16,0.360000
2012-12-13,0.756000
2014-09-09,0.148000
2022-06-29,0.130000
2022-12-14,0.536000
2000-12-18,0.910000
2007-09-10,0.073000
2009-03-10,0.007000
2010-06-08,0.130000
2023-12-13,0.306000
2024-09-27,0.316000
2019-09-27,0.207000
2005-09-08,0.090000
2008-09-09,0.147000
2009-12-09,0.066000
2016-09-29,0.019000
2019-06-27,0.036000
2014-06-09,0.067000
2015-09-09,0.179000
2022-03-30,0.030000
2005-03-08,0.024000
2006-12-18,1.188000
2008-12-10,0.095000
2009-06-09,0.120000
2021-09-29,0.149000
2022-09-29,0.208000
2005-06-08,0.090000
2013-03-08,0.018000
2014-12-16,0.608000
2021-03-30,0.028000
2025-06-27,0.181000
1999-12-20,6.532000
2003-12-22,0.163000
2004-09-08,0.049000
2013-06-10,0.123000
2018-09-27,0.188000
2020-09-29,0.106000
2024-12-13,0.303000
2026-03-30,0.030000
2007-06-08,0.120000
2008-06-10,0.179000
2012-09-10,0.089000
2017-09-28,0.195000
2026-06-29,0.236000
2006-03-08,0.020000
2006-06-08,0.109000
2007-12-19,1.564000
2009-09-09,0.057000
2021-06-29,0.029000
2006-09-08,0.089000
2011-12-13,0.546000
2015-06-08,0.015000
2016-06-29,0.160000