f/overrides/event-backup/ardex-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
2015-05-29,0.023000
2005-09-30,0.036000
2007-08-31,0.036000
2010-05-28,0.026000
2025-09-26,0.098000
2006-01-31,0.021000
2008-03-31,0.042000
2015-09-30,0.029000
2014-12-30,1.212000
2016-08-31,0.045000
2007-12-14,0.708000
2009-08-31,0.015000
2013-08-30,0.037000
2019-06-26,0.066000
2020-03-27,0.074000
2025-06-26,0.098000
2010-08-31,0.033000
2011-02-28,0.029000
2013-12-30,0.850000
2015-03-31,0.022000
2022-06-28,0.041000
2016-05-31,0.031000
2017-08-28,0.012000
2009-02-27,0.013000
2012-05-31,0.039000
2015-07-31,0.008000
2007-06-29,0.041000
2011-03-31,0.028000
2013-06-28,0.026000
2008-09-30,0.033000
2009-12-29,0.030000
2010-06-30,0.017000
2014-08-29,0.024000
2015-08-31,0.025000
2005-11-30,0.058000
2006-08-31,0.039000
2007-02-28,0.035000
2010-04-01,0.050000
2012-12-28,0.500000
2013-05-31,0.037000
2014-04-30,0.007000
2018-02-26,0.007000
2019-09-26,0.030000
2008-11-26,0.014000
2011-10-31,0.009000
2012-03-30,0.020000
2014-06-30,0.027000
2016-06-30,0.026000
2017-03-28,0.012000
2017-06-27,0.008000
2018-06-27,0.012000
2008-02-29,0.030000
2008-12-29,0.029000
2011-11-30,0.038000
2023-09-27,0.035000
2013-10-31,0.014000
2015-10-30,0.008000
2016-07-29,0.009000
2016-10-26,0.006000
2017-12-27,0.752000
2008-08-29,0.024000
2009-05-29,0.025000
2012-01-31,0.005000
2019-03-27,0.052000
2020-09-28,0.069000
2024-09-26,0.102000
2006-12-15,0.156000
2007-09-28,0.038000
2019-12-16,0.897000
2008-10-31,0.018000
2012-07-31,0.012000
2023-06-28,0.064000
2008-07-31,0.015000
2010-09-30,0.022000
2011-06-30,0.038000
2011-07-29,0.005000
2015-06-30,0.030000
2005-10-31,0.022000
2005-12-16,0.032000
2007-11-30,0.035000
2017-09-26,0.012000
2026-03-27,0.060000
2007-04-30,0.023000
2010-10-29,0.011000
2012-02-29,0.033000
2022-09-28,0.047000
2023-12-14,0.268000
2006-02-28,0.037000
2009-11-30,0.014000
2010-01-29,0.013000
2023-03-29,0.048000
2009-03-31,0.012000
2011-05-31,0.028000
2018-09-26,0.054000
2005-07-29,0.021000
2017-10-26,0.012000
2021-03-29,0.054000
2014-02-28,0.056000
2014-03-31,0.035000
2015-12-30,1.209000
2017-11-27,0.014000
2007-07-31,0.013000
2011-04-29,0.017000
2012-08-31,0.039000
2016-12-27,0.958000
2021-09-28,0.068000
2022-12-15,1.239000
2005-08-31,0.043000
2007-10-31,0.018000
2011-01-31,0.007000
2018-12-27,0.874000
2009-01-30,0.015000
2009-09-30,0.019000
2016-11-25,0.020000
2010-07-30,0.014000
2011-08-31,0.029000
2012-06-29,0.029000
2012-09-28,0.019000
2013-11-29,0.052000
2006-05-31,0.049000
2008-01-31,0.013000
2008-04-30,0.009000
2014-07-31,0.036000
2025-12-16,1.229000
2009-07-31,0.013000
2013-03-28,0.005000
2014-09-30,0.066000
2017-04-25,0.011000
2024-12-16,4.651000
2006-06-30,0.037000
2007-05-31,0.039000
2008-06-30,0.028000
2026-06-26,0.053000
2021-12-15,2.330000
2007-03-30,0.048000
2010-12-29,0.027000
2012-10-31,0.027000
2013-09-30,0.018000
2014-05-30,0.049000
2014-10-31,0.047000
2016-04-29,0.007000
2018-05-29,0.012000
2006-07-31,0.016000
2006-11-30,0.043000
2011-09-30,0.019000
2022-03-29,0.051000
2025-03-27,0.098000
2021-06-28,0.020000
2024-03-26,0.063000
2009-04-30,0.013000
2010-03-31,0.020000
2016-09-30,0.026000
2012-04-30,0.014000
2018-03-27,0.006000
2006-04-28,0.020000
2006-09-29,0.031000
2009-10-30,0.012000
2011-12-29,0.099000
2014-11-28,0.026000
2015-04-30,0.008000
2020-12-16,0.061000
2006-10-31,0.020000
2007-01-31,0.011000
2009-06-30,0.011000
2013-02-28,0.036000
2024-06-26,0.075000
2010-11-30,0.025000
2012-11-30,0.038000
2016-03-31,0.018000
2017-02-23,0.007000
2017-05-25,0.005000
2006-03-31,0.048000
2008-05-30,0.036000
2010-02-26,0.020000
2017-07-26,0.012000
2020-06-26,0.039000