f/overrides/event-backup/aidax-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
2008-01-18,0.025000
2004-02-20,0.040000
2005-12-30,0.013000
2024-10-18,0.031000
2016-04-20,0.035000
2024-02-20,0.031000
2022-10-20,0.025000
2004-08-20,0.035000
2009-03-20,0.035000
2011-02-28,0.033000
2012-03-30,0.032000
2016-09-20,0.020000
2022-03-18,0.017000
2024-03-20,0.030000
2026-03-20,0.031000
2005-03-18,0.029000
2008-10-20,0.036000
2007-11-20,0.036000
2008-09-19,0.039000
2014-05-30,0.025000
2023-10-20,0.031000
2026-05-20,0.033000
2005-05-20,0.036000
2007-12-31,0.013000
2012-10-31,0.031000
2008-02-20,0.036000
2010-01-29,0.035000
2011-12-30,0.033000
2019-01-18,0.017000
2019-04-18,0.028000
2024-06-20,0.033000
2008-06-20,0.039000
2009-09-18,0.037000
2017-09-20,0.022000
2023-01-20,0.018000
2023-08-18,0.029000
2006-08-18,0.036000
2009-11-20,0.039000
2007-08-20,0.033000
2010-12-07,0.073000
2015-04-20,0.021000
2016-07-20,0.019000
2017-10-20,0.023000
2020-03-20,0.026000
2003-07-18,0.034000
2003-09-19,0.038000
2025-11-20,0.035000
2010-07-30,0.035000
2010-12-31,0.036000
2015-10-20,0.021000
2016-05-20,0.022000
2017-07-20,0.021000
2018-02-20,0.023000
2005-04-20,0.035000
2007-04-20,0.038000
2024-04-19,0.033000
2018-10-19,0.024000
2020-11-20,0.026000
2012-06-29,0.031000
2014-03-31,0.025000
2002-03-20,0.040000
2010-09-30,0.034000
2012-12-12,0.020000
2013-09-30,0.027000
2019-03-20,0.023000
2023-02-17,0.027000
2003-10-20,0.035000
2003-12-31,0.012000
2014-10-31,0.022000
2015-02-20,0.023000
2016-02-19,0.019000
2021-12-31,0.006000
2026-01-20,0.022000
2007-06-20,0.036000
2014-01-31,0.026000
2018-08-20,0.022000
2012-08-31,0.031000
2015-12-18,0.017000
2024-12-20,0.035000
2007-09-20,0.036000
2022-09-20,0.023000
2013-07-31,0.028000
2017-05-19,0.022000
2021-06-18,0.020000
2004-04-20,0.034000
2005-01-20,0.022000
2009-10-20,0.036000
2011-11-30,0.032000
2015-11-20,0.021000
2003-08-20,0.037000
2005-06-20,0.032000
2007-02-20,0.034000
2014-06-30,0.023000
2017-01-20,0.015000
2003-06-20,0.041000
2004-05-20,0.034000
2004-12-20,0.032000
2005-10-20,0.034000
2014-08-29,0.021000
2020-08-20,0.025000
2004-01-20,0.023000
2004-11-19,0.035000
2014-11-20,0.023000
2020-02-20,0.025000
2008-05-20,0.036000
2013-05-31,0.029000
2025-09-19,0.037000
2013-06-28,0.028000
2019-12-20,0.026000
2023-12-29,0.011000
2024-01-19,0.021000
2005-08-19,0.036000
2011-03-31,0.035000
2013-01-31,0.030000
2016-12-20,0.020000
2018-06-20,0.024000
2021-11-19,0.020000
2022-05-20,0.023000
2023-07-20,0.028000
2010-08-31,0.035000
2011-01-31,0.036000
2024-05-20,0.031000
2025-12-19,0.035000
2020-04-20,0.024000
2021-09-20,0.018000
2016-12-30,0.008000
2024-08-20,0.033000
2025-12-31,0.011000
2006-04-20,0.035000
2013-12-10,0.002000
2020-12-18,0.021000
2025-01-17,0.022000
2006-12-20,0.035000
2011-07-29,0.033000
2013-03-28,0.029000
2014-02-28,0.023000
2015-09-18,0.020000
2017-02-17,0.021000
2017-11-20,0.021000
2020-09-18,0.024000
2005-07-20,0.033000
2008-12-19,0.038000
2021-10-20,0.018000
2024-12-31,0.010000
2021-05-20,0.019000
2021-07-20,0.021000
2023-06-20,0.028000
2024-07-19,0.033000
2004-12-31,0.012000
2010-05-28,0.035000
2021-08-20,0.020000
2022-08-19,0.025000
2008-12-09,0.014000
2009-06-19,0.038000
2012-01-31,0.033000
2014-10-20,0.022000
2019-09-20,0.037000
2023-05-19,0.029000
2002-02-20,0.032000
2003-11-20,0.037000
2022-04-20,0.021000
2022-06-17,0.021000
2023-04-20,0.029000
2023-11-20,0.029000
2012-04-30,0.032000
2014-07-31,0.022000
2021-02-19,0.022000
2011-09-30,0.032000
2012-11-30,0.030000
2011-05-31,0.036000
2012-05-31,0.032000
2014-12-31,0.007000
2016-11-18,0.020000
2003-03-20,0.038000
2006-10-20,0.037000
2021-03-19,0.019000
2025-03-20,0.031000
2011-08-31,0.034000
2019-11-20,0.026000
2009-04-20,0.036000
2018-05-18,0.022000
2004-06-18,0.035000
2008-07-18,0.034000
2015-01-20,0.014000
2022-07-20,0.022000
2002-04-22,0.043000
2009-12-31,0.012000
2009-05-20,0.037000
2010-11-30,0.034000
2013-04-30,0.028000
2014-09-30,0.022000
2016-08-19,0.021000
2026-04-20,0.032000
2008-11-20,0.037000
2009-02-20,0.040000
2023-03-20,0.027000
2006-02-21,0.033000
2013-02-28,0.027000
2025-02-20,0.034000
2006-12-29,0.013000
2012-12-31,0.031000
2013-08-30,0.028000
2015-05-20,0.022000
2005-11-18,0.037000
2009-01-20,0.024000
2016-10-21,0.020000
2019-10-18,0.023000
2021-01-20,0.014000
2013-11-29,0.027000
2015-12-31,0.007000
2024-09-20,0.036000
2006-07-20,0.034000
2021-12-20,0.017000
2013-12-31,0.027000
2019-12-31,0.007000
2020-10-20,0.023000
2006-05-19,0.036000
2013-10-31,0.027000
2020-06-19,0.026000
2022-12-20,0.025000
2024-11-20,0.034000
2003-12-19,0.036000
2009-12-08,0.023000
2010-02-26,0.032000
2010-03-31,0.035000
2018-12-20,0.023000
2025-04-17,0.035000
2025-10-20,0.033000
2004-10-20,0.032000
2006-06-20,0.034000
2026-02-20,0.037000
2006-01-20,0.025000
2017-04-20,0.022000
2025-07-18,0.032000
2005-02-18,0.035000
2017-03-20,0.020000
2022-11-18,0.027000
2012-09-28,0.030000
2016-01-20,0.012000
2010-10-29,0.035000
2018-04-20,0.025000
2022-12-30,0.010000
2004-07-20,0.033000
2009-08-20,0.038000
2015-03-20,0.020000
2015-07-20,0.021000
2022-01-20,0.012000
2007-05-18,0.032000
2009-12-18,0.032000
2017-12-20,0.022000
2019-08-20,0.026000
2020-01-17,0.016000
2020-07-20,0.024000
2007-07-20,0.037000
2007-10-19,0.037000
2011-10-31,0.031000
2017-12-29,0.008000
2023-12-20,0.030000
2004-09-20,0.031000
2005-12-20,0.035000
2008-04-18,0.035000
2008-08-20,0.037000
2015-08-20,0.022000
2020-05-20,0.024000
2007-01-19,0.024000
2008-03-20,0.040000
2018-03-20,0.021000
2018-07-20,0.023000
2018-11-20,0.024000
2019-05-20,0.026000
2019-06-20,0.027000
2019-07-19,0.027000
2003-05-20,0.039000
2014-04-30,0.023000
2023-09-20,0.029000
2026-07-20,0.031000
2004-03-19,0.032000
2012-07-31,0.032000
2022-02-18,0.020000
2025-05-20,0.034000
2011-04-29,0.035000
2014-12-22,0.023000
2019-02-20,0.025000
2025-06-20,0.037000
2005-09-20,0.033000
2007-03-20,0.032000
2008-12-31,0.012000
2017-08-18,0.022000
2018-01-19,0.016000
2018-09-20,0.023000
2020-12-31,0.008000
2021-04-20,0.021000
2006-09-20,0.035000
2006-11-20,0.033000
2011-06-30,0.034000
2011-12-14,0.012000
2015-06-19,0.023000
2017-06-20,0.021000
2025-08-20,0.035000
2006-03-20,0.032000
2009-07-20,0.035000
2010-06-30,0.035000
2012-02-29,0.031000
2016-06-20,0.020000
2018-12-31,0.009000
2003-04-17,0.040000
2007-12-20,0.036000