f/overrides/event-backup/annpx-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
1998-07-22,0.021000
1998-12-17,0.133000
1999-12-30,0.158000
2007-03-29,0.115000
2019-03-21,0.076000
2019-12-19,1.282000
2021-09-16,0.080000
1997-03-31,0.142000
2008-03-28,0.090000
2014-09-18,0.128000
2018-06-21,0.088000
2024-09-19,0.167000
1996-09-30,0.125000
1998-09-30,0.134000
2004-12-30,0.104000
2021-12-16,7.592000
2026-03-19,0.122000
1996-12-31,0.119000
2002-03-27,0.154000
2009-12-30,0.175000
2017-12-21,6.144000
2021-03-18,0.064000
2022-06-16,0.057000
1994-09-30,0.148000
2003-12-30,0.130000
2006-12-28,0.120000
2017-03-16,0.257000
1996-06-28,0.131000
2000-03-30,0.110000
2004-03-30,0.121000
2016-06-09,0.006000
2024-12-19,0.369000
2002-12-30,0.174000
2018-12-20,4.387000
2020-06-18,0.075000
2006-09-28,0.120000
2009-09-29,0.186000
2025-09-18,0.124000
1993-06-30,0.064000
2018-03-22,0.076000
2020-12-17,2.817000
1994-03-31,0.118000
2007-12-28,0.049000
2010-12-16,0.280000
2014-12-11,2.292000
2026-06-18,0.095000
2005-09-29,0.150000
2011-12-22,0.382000
2013-03-21,0.116000
2013-06-20,0.138000
2013-09-19,0.122000
1993-12-31,0.117000
1999-09-29,0.150000
2008-06-27,0.082000
2015-09-17,0.118000
2021-06-17,0.030000
2023-09-21,0.144000
2010-03-30,0.160000
2016-09-22,0.160000
2017-09-21,0.154000
2020-03-19,0.039000
2000-12-28,0.164000
2007-09-27,0.089000
2012-03-22,0.252000
2016-12-22,0.412000
2022-09-22,0.089000
2009-03-30,0.145000
2009-06-29,0.170000
2011-09-22,0.143000
2015-12-17,0.293000
2019-06-20,0.082000
2023-06-22,0.115000
2001-06-28,0.215000
2002-06-27,0.173000
2013-12-12,0.427000
2024-06-20,0.161000
2025-03-20,0.157000
2016-06-16,0.151000
1994-12-15,0.059000
2001-09-27,0.202000
2005-06-29,0.130000
2005-12-29,0.150000
2010-06-17,0.150000
2014-08-07,0.413000
2015-03-19,0.138000
1993-04-19,0.001000
1994-06-30,0.129000
2003-03-28,0.162000
2010-09-16,0.173000
2015-06-18,0.114000
2024-03-21,0.120000
2025-06-18,0.193000
1993-09-30,0.123000
1995-03-31,0.122000
2012-09-20,0.090000
2022-12-22,0.270000
2025-12-18,3.906000
1997-09-30,0.092000
1998-07-07,0.129000
2004-09-29,0.137000
2005-03-30,0.120000
2011-06-16,0.139000
2014-12-18,0.278000
2020-09-17,0.067000
2002-09-27,0.205000
2006-06-29,0.120000
2008-12-30,0.128000
2013-12-19,0.445000
2011-03-17,0.153000
2014-03-20,0.116000
2017-06-22,0.145000
1994-12-30,0.084000
2012-12-20,0.180000
2018-09-20,0.093000
2023-12-21,0.456000
1998-03-31,0.156000
1999-03-30,0.119000
2014-06-19,0.144000
2023-03-16,0.097000
1996-03-29,0.134000
1997-06-30,0.114000
1997-12-18,0.109000
1999-06-29,0.055000
2000-09-28,0.176000
2019-09-19,0.079000
2022-03-17,0.047000
1995-06-30,0.138000
2001-03-29,0.158000
2003-06-27,0.183000
2003-09-29,0.161000
2007-06-28,0.091000
2008-09-29,0.080000
1995-09-29,0.140000
1995-12-15,0.115000
2000-06-29,0.162000
2001-12-28,0.169000
2004-06-29,0.087000
2006-03-30,0.120000
2011-12-15,1.573000
2016-03-17,0.152000
2012-06-21,0.107000
2015-12-10,2.503000