f/overrides/event-backup/asrax-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
2012-06-14,0.110000
2013-12-13,0.233000
2018-03-22,0.060000
2019-09-19,0.115000
2022-03-24,0.046000
2006-04-13,0.104000
2011-12-09,0.105000
2014-03-20,0.091000
2016-03-17,0.064000
2003-10-16,0.102000
2005-12-15,0.104000
2013-09-19,0.090000
2024-12-12,0.088000
2005-04-15,0.103000
2003-06-11,0.102000
2005-08-15,0.103000
2007-03-20,0.061000
2009-06-19,0.040000
2017-06-15,0.061000
2025-09-25,0.054000
2004-07-15,0.103000
2008-06-18,0.105000
2009-12-11,0.069000
2010-06-17,0.069000
2012-09-20,0.102000
2022-12-14,0.046000
2003-04-11,0.102000
2004-08-17,0.103000
2007-02-15,0.050000
2007-06-20,0.218000
2005-10-14,0.104000
2026-03-26,0.054000
2026-06-25,0.055000
2006-06-14,0.104000
2012-03-15,0.095000
2015-03-19,0.076000
2024-03-28,0.065000
2017-03-16,0.041000
2017-12-13,0.152000
2022-06-23,0.046000
2004-05-17,0.103000
2008-12-12,0.088000
2010-03-18,0.070000
2013-06-20,0.090000
2011-09-15,0.091000
2016-09-15,0.108000
2020-03-19,0.067000
2021-06-24,0.036000
2003-05-13,0.102000
2005-09-15,0.103000
2006-08-16,0.104000
2008-09-18,0.105000
2003-08-14,0.102000
2006-11-15,0.104000
2010-12-03,0.084000
2021-09-23,0.046000
2014-09-18,0.126000
2021-12-14,0.071000
2003-03-14,0.101000
2003-07-16,0.102000
2005-03-17,0.103000
2011-03-17,0.058000
2011-06-16,0.091000
2004-04-15,0.103000
2019-03-21,0.074000
2009-03-20,0.045000
2023-03-23,0.046000
2005-06-15,0.103000
2004-02-17,0.103000
2005-01-13,0.103000
2022-09-22,0.046000
2005-11-15,0.104000
2020-06-18,0.048000
2025-03-27,0.063000
2019-06-20,0.075000
2023-06-22,0.052000
2005-07-15,0.103000
2009-09-18,0.066000
2017-09-14,0.061000
2018-09-13,0.074000
2018-12-14,0.087000
2004-09-15,0.103000
2010-09-16,0.075000
2016-12-13,0.149000
2018-06-21,0.075000
2025-06-26,0.053000
2004-12-15,0.103000
2006-01-18,0.104000
2006-02-15,0.104000
2014-06-19,0.111000
2023-12-13,0.100000
2003-11-13,0.102000
2003-12-17,0.103000
2006-10-18,0.104000
2015-09-17,0.076000
2005-02-11,0.103000
2013-03-21,0.074000
2020-12-11,0.037000
2006-07-14,0.104000
2025-12-11,0.054000
2012-12-07,0.237000
2015-12-11,0.272000
2024-09-26,0.065000
2005-05-16,0.103000
2006-05-17,0.104000
2007-12-14,0.244000
2008-03-18,0.089000
2004-03-15,0.103000
2020-09-17,0.047000
2023-09-28,0.051000
2003-09-17,0.102000
2006-03-16,0.104000
2006-09-14,0.104000
2015-06-18,0.076000
2021-03-25,0.036000
2024-06-27,0.065000
2004-01-15,0.103000
2004-06-15,0.103000
2016-06-16,0.069000
2019-12-13,0.499000
2014-12-12,0.110000
2004-10-15,0.103000
2004-11-15,0.103000
2007-01-19,0.050000
2007-09-20,0.212000