f/overrides/event-backup/bagix-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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Plaintext

Date,Dividends,ctime
2018-07-25,0.027,2019-09-23 16:13:27
2017-03-27,0.021,2019-09-23 16:13:27
2006-11-27,0.045,2019-09-23 16:13:27
2014-04-25,0.028,2019-09-23 16:13:27
2004-06-25,0.043,2019-09-23 16:13:27
2015-08-25,0.022,2019-09-23 16:13:27
2005-10-25,0.042,2019-09-23 16:13:27
2013-03-25,0.027,2019-09-23 16:13:27
2017-06-26,0.023,2019-09-23 16:13:27
2007-02-26,0.045,2019-09-23 16:13:27
2007-08-27,0.046,2019-09-23 16:13:27
2014-07-25,0.026,2019-09-23 16:13:27
2011-08-25,0.043,2019-09-23 16:13:27
2017-09-25,0.022,2019-09-23 16:13:27
2009-03-25,0.043,2019-09-23 16:13:27
2006-04-25,0.045,2019-09-23 16:13:27
2007-12-26,0.095,2019-09-23 16:13:27
2013-09-25,0.029,2019-09-23 16:13:27
2014-11-25,0.025,2019-09-23 16:13:27
2005-01-25,0.043,2019-09-23 16:13:27
2006-07-25,0.044,2019-09-23 16:13:27
2016-03-28,0.021,2019-09-23 16:13:27
2007-11-26,0.046,2019-09-23 16:13:27
2010-05-25,0.04,2019-09-23 16:13:27
2012-02-27,0.037,2019-09-23 16:13:27
2019-01-25,0.021,2019-09-23 16:13:27
2007-06-25,0.042,2019-09-23 16:13:27
2016-02-25,0.024,2019-09-23 16:13:27
2012-03-26,0.034,2019-09-23 16:13:27
2017-10-25,0.024,2019-09-23 16:13:27
2016-06-27,0.023,2019-09-23 16:13:27
2008-02-25,0.047,2019-09-23 16:13:27
2006-05-25,0.043,2019-09-23 16:13:27
2012-06-25,0.04,2019-09-23 16:13:27
2016-09-26,0.021,2019-09-23 16:13:27
2013-10-25,0.027,2019-09-23 16:13:27
2012-12-26,0.209,2019-09-23 16:13:27
2019-05-28,0.026,2019-09-23 16:13:27
2018-04-25,0.026,2019-09-23 16:13:27
2008-06-25,0.048,2019-09-23 16:13:27
2011-11-28,0.04,2019-09-23 16:13:27
2008-12-26,0.059,2019-09-23 16:13:27
2015-05-26,0.019,2019-09-23 16:13:27
2019-03-25,0.022,2019-09-23 16:13:27
2013-02-25,0.029,2019-09-23 16:13:27
2013-08-26,0.028,2019-09-23 16:13:27
2015-03-25,0.022,2019-09-23 16:13:27
2018-12-26,0.035,2019-09-23 16:13:27
2005-05-25,0.043,2019-09-23 16:13:27
2009-02-25,0.048,2019-09-23 16:13:27
2004-11-26,0.045,2019-09-23 16:13:27
2007-01-25,0.041,2019-09-23 16:13:27
2012-10-25,0.032,2019-09-23 16:13:27
2004-02-25,0.045,2019-09-23 16:13:27
2011-03-25,0.035,2019-09-23 16:13:27
2004-04-26,0.042,2019-09-23 16:13:27
2011-01-25,0.029,2019-09-23 16:13:27
2016-10-25,0.022,2019-09-23 16:13:27
2005-12-27,0.05,2019-09-23 16:13:27
2012-11-26,0.031,2019-09-23 16:13:27
2018-08-27,0.025,2019-09-23 16:13:27
2017-02-27,0.023,2019-09-23 16:13:27
2004-07-26,0.041,2019-09-23 16:13:27
2008-10-27,0.044,2019-09-23 16:13:27
2015-09-25,0.022,2019-09-23 16:13:27
2018-03-26,0.023,2019-09-23 16:13:27
2012-08-27,0.035,2019-09-23 16:13:27
2009-09-25,0.044,2019-09-23 16:13:27
2009-11-25,0.044,2019-09-23 16:13:27
2016-08-25,0.022,2019-09-23 16:13:27
2018-06-25,0.024,2019-09-23 16:13:27
2008-08-25,0.042,2019-09-23 16:13:27
2005-11-25,0.041,2019-09-23 16:13:27
2014-06-25,0.028,2019-09-23 16:13:27
2004-08-25,0.044,2019-09-23 16:13:27
2017-11-27,0.024,2019-09-23 16:13:27
2014-12-26,0.031,2019-09-23 16:13:27
2007-10-25,0.046,2019-09-23 16:13:27
2006-12-26,0.049,2019-09-23 16:13:27
2013-11-25,0.027,2019-09-23 16:13:27
2010-06-25,0.041,2019-09-23 16:13:27
2018-02-26,0.024,2019-09-23 16:13:27
2011-10-25,0.039,2019-09-23 16:13:27
2017-05-25,0.023,2019-09-23 16:13:27
2004-09-27,0.045,2019-09-23 16:13:27
2018-01-25,0.019,2019-09-23 16:13:27
2008-09-25,0.048,2019-09-23 16:13:27
2011-05-25,0.04,2019-09-23 16:13:27
2015-02-25,0.025,2019-09-23 16:13:27
2010-11-26,0.042,2019-09-23 16:13:27
2018-10-25,0.025,2019-09-23 16:13:27
2004-03-25,0.041,2019-09-23 16:13:27
2016-12-27,0.051,2019-09-23 16:13:27
2007-05-25,0.043,2019-09-23 16:13:27
2014-01-27,0.022,2019-09-23 16:13:27
2011-02-25,0.041,2019-09-23 16:13:27
2011-12-27,0.265,2019-09-23 16:13:27
2013-06-25,0.029,2019-09-23 16:13:27
2018-11-26,0.026,2019-09-23 16:13:27
2009-01-26,0.034,2019-09-23 16:13:27
2010-07-26,0.044,2019-09-23 16:13:27
2014-10-27,0.023,2019-09-23 16:13:27
2019-04-25,0.028,2019-09-23 16:13:27
2009-06-25,0.049,2019-09-23 16:13:27
2019-02-25,0.026,2019-09-23 16:13:27
2010-10-25,0.036,2019-09-23 16:13:27
2016-05-25,0.023,2019-09-23 16:13:27
2005-03-28,0.037,2019-09-23 16:13:27
2015-01-28,0.018,2019-09-23 16:13:27
2007-09-25,0.045,2019-09-23 16:13:27
2013-04-25,0.031,2019-09-23 16:13:27
2004-12-23,0.065,2019-09-23 16:13:27
2014-08-25,0.023,2019-09-23 16:13:27
2004-10-25,0.037,2019-09-23 16:13:27
2017-04-25,0.023,2019-09-23 16:13:27
2013-07-25,0.027,2019-09-23 16:13:27
2017-12-26,0.031,2019-09-23 16:13:27
2009-04-27,0.048,2019-09-23 16:13:27
2010-08-25,0.038,2019-09-23 16:13:27
2000-10-25,0.032,2019-09-23 16:13:27
2015-01-26,0.018,2019-09-23 16:13:27
2017-07-25,0.023,2019-09-23 16:13:27
2008-03-25,0.048,2019-09-23 16:13:27
2005-04-25,0.04,2019-09-23 16:13:27
2009-07-27,0.043,2019-09-23 16:13:27
2010-01-25,0.029,2019-09-23 16:13:27
2006-08-25,0.049,2019-09-23 16:13:27
2012-09-25,0.034,2019-09-23 16:13:27
2019-08-26,0.025,2019-09-23 16:13:27
2005-07-25,0.038,2019-09-23 16:13:27
2009-10-26,0.041,2019-09-23 16:13:27
2015-11-25,0.021,2019-09-23 16:13:27
2006-01-25,0.04,2019-09-23 16:13:27
2009-05-26,0.046,2019-09-23 16:13:27
2008-11-25,0.048,2019-09-23 16:13:27
2016-04-25,0.021,2019-09-23 16:13:27
2006-06-26,0.044,2019-09-23 16:13:27
2012-01-25,0.029,2019-09-23 16:13:27
2008-04-25,0.046,2019-09-23 16:13:27
2019-06-25,0.027,2019-09-23 16:13:27
2009-08-25,0.043,2019-09-23 16:13:27
2016-01-25,0.016,2019-09-23 16:13:27
2016-07-25,0.02,2019-09-23 16:13:27
2006-03-27,0.037,2019-09-23 16:13:27
2006-09-25,0.043,2019-09-23 16:13:27
2012-04-25,0.037,2019-09-23 16:13:27
2009-12-28,0.055,2019-09-23 16:13:27
2011-06-27,0.037,2019-09-23 16:13:27
2016-11-25,0.021,2019-09-23 16:13:27
2018-05-25,0.024,2019-09-23 16:13:27
2008-07-25,0.045,2019-09-23 16:13:27
2013-12-26,0.04,2019-09-23 16:13:27
2015-06-25,0.023,2019-09-23 16:13:27
2005-08-25,0.043,2019-09-23 16:13:27
2012-07-25,0.038,2019-09-23 16:13:27
2011-09-26,0.038,2019-09-23 16:13:27
2014-05-27,0.026,2019-09-23 16:13:27
2007-03-26,0.043,2019-09-23 16:13:27
2017-01-25,0.017,2019-09-23 16:13:27
2019-07-25,0.025,2019-09-23 16:13:27
2008-05-27,0.043,2019-09-23 16:13:27
2014-02-25,0.029,2019-09-23 16:13:27
2015-04-27,0.019,2019-09-23 16:13:27
2005-06-27,0.043,2019-09-23 16:13:27
2006-10-25,0.046,2019-09-23 16:13:27
2012-05-25,0.034,2019-09-23 16:13:27
2014-03-25,0.025,2019-09-23 16:13:27
2015-12-28,0.029,2019-09-23 16:13:27
2013-01-25,0.024,2019-09-23 16:13:27
2004-05-25,0.044,2019-09-23 16:13:27
2006-02-27,0.042,2019-09-23 16:13:27
2011-04-25,0.035,2019-09-23 16:13:27
2010-02-25,0.048,2019-09-23 16:13:27
2015-07-27,0.021,2019-09-23 16:13:27
2005-09-26,0.039,2019-09-23 16:13:27
2010-12-27,0.113,2019-09-23 16:13:27
2008-01-25,0.04,2019-09-23 16:13:27
2018-09-25,0.026,2019-09-23 16:13:27
2010-03-25,0.039,2019-09-23 16:13:27
2011-07-25,0.034,2019-09-23 16:13:27
2015-10-26,0.021,2019-09-23 16:13:27
2007-04-25,0.047,2019-09-23 16:13:27
2010-09-27,0.04,2019-09-23 16:13:27
2017-08-25,0.023,2019-09-23 16:13:27
2013-05-28,0.028,2019-09-23 16:13:27
2014-09-25,0.027,2019-09-23 16:13:27
2007-07-25,0.047,2019-09-23 16:13:27