f/overrides/event-backup/cnsax-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
1997-12-16,0.182000
2017-12-13,0.283000
2007-12-14,0.118000
2022-12-14,0.657000
2025-09-25,0.168000
2011-09-15,0.098000
2012-06-14,0.116000
2014-09-18,0.122000
1998-03-24,0.169000
2001-12-14,0.170000
2002-03-21,0.167000
2005-03-23,0.133000
2008-06-23,0.116000
2020-06-18,0.097000
2003-06-23,0.121000
2006-09-22,0.108000
2026-03-26,0.134000
2003-12-15,0.130000
2007-09-21,0.116000
2009-09-30,0.172000
2015-03-19,0.141000
2016-09-13,0.217000
2021-12-14,7.098000
1998-06-23,0.169000
1999-06-23,0.166000
2007-03-23,0.118000
2012-03-15,0.105000
2014-03-20,0.127000
2023-03-23,0.062000
1997-09-23,0.154000
2007-06-22,0.116000
2013-06-20,0.136000
2017-09-14,0.258000
2021-03-25,0.083000
2024-09-26,0.128000
2004-06-23,0.131000
2005-09-23,0.103000
2008-09-23,0.114000
2011-06-16,0.097000
2016-03-17,0.152000
2017-06-15,0.258000
1999-12-16,0.301000
2003-03-24,0.121000
2004-03-24,0.133000
2024-06-27,0.121000
2025-12-11,2.378000
1999-09-23,0.166000
2005-06-23,0.117000
2006-12-15,0.160000
2008-03-24,0.117000
2000-06-23,0.171000
2011-03-17,0.097000
2012-09-20,0.116000
2023-06-22,0.072000
1998-09-23,0.167000
1999-03-24,0.172000
2000-12-15,0.172000
2002-12-13,0.120000
2006-03-24,0.105000
2016-06-16,0.171000
1998-12-15,0.277000
2001-03-23,0.169000
2002-06-21,0.168000
2015-09-17,0.140000
2018-03-22,0.189000
2018-06-21,0.163000
2025-06-26,0.162000
2014-12-12,0.869000
2001-06-22,0.169000
2003-09-23,0.128000
2006-06-23,0.108000
2012-12-07,0.126000
2009-03-31,0.107000
2019-09-19,0.093000
2021-09-23,0.041000
2024-12-12,0.409000
2002-09-23,0.141000
2023-09-28,0.071000
2024-03-28,0.112000
2020-03-19,0.087000
2020-12-11,3.154000
2001-09-28,0.166000
2011-12-09,0.098000
2010-09-16,0.172000
2013-12-13,0.702000
2015-12-11,0.141000
2019-12-13,1.068000
2022-06-23,0.042000
2022-09-22,0.042000
2010-06-23,0.188000
2013-03-21,0.128000
2013-09-19,0.136000
2015-06-18,0.140000
2017-03-16,0.258000
2010-12-03,0.128000
2018-09-13,0.127000
2020-09-17,0.093000
2021-06-24,0.063000
2023-12-13,0.070000
2026-06-25,0.136000
2000-09-22,0.172000
2009-06-23,0.108000
2010-03-31,0.177000
2016-12-13,0.268000
2019-03-21,0.089000
2004-09-23,0.131000
2004-12-15,0.132000
2014-06-19,0.122000
2025-03-27,0.152000
2000-03-24,0.176000
2008-12-15,0.229000
2009-12-15,0.174000
2018-12-14,2.170000
2005-12-15,0.102000
2019-06-20,0.089000
2022-03-24,0.042000