f/overrides/event-backup/ijs-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
2002-06-17,0.043750
2007-12-27,0.151000
2009-06-23,0.095500
2010-09-24,0.097000
2013-03-25,0.129000
2019-12-16,0.501000
2023-09-26,0.523000
2024-03-21,0.365000
2024-09-25,0.565000
2003-06-16,0.052500
2005-06-21,0.053500
2007-06-29,0.254000
2013-06-26,0.161500
2015-12-24,0.231500
2019-09-24,0.290500
2025-06-16,0.428000
2026-03-17,0.205000
2001-03-12,0.030250
2006-09-27,0.096000
2012-06-19,0.223000
2019-06-17,0.262000
2020-09-23,0.283500
2022-06-09,0.283000
2002-12-16,0.050500
2003-09-15,0.049750
2011-09-26,0.121000
2013-12-23,0.222500
2015-06-24,0.181500
2018-03-22,0.264000
2021-06-10,0.248000
2023-06-07,0.394000
2001-10-02,0.045750
2002-09-16,0.044250
2005-09-26,0.069500
2005-12-23,0.095000
2009-09-23,0.109000
2011-03-25,0.082500
2016-03-23,0.201500
2020-03-25,0.266500
2000-09-20,0.029000
2001-06-11,0.031500
2006-03-27,0.110000
2008-12-24,0.180000
2014-06-24,0.197000
2015-03-25,0.255500
2015-09-25,0.190500
2016-06-21,0.190000
2001-12-17,0.038750
2004-03-29,0.057000
2004-09-27,0.069500
2010-06-23,0.081500
2012-12-19,0.307500
2017-03-24,0.306500
2023-12-20,0.218000
2025-03-18,0.359000
2025-12-16,0.544000
2011-12-22,0.164000
2016-12-21,0.264000
2021-03-25,0.341000
2022-09-26,0.511000
2018-12-17,0.319500
2003-12-16,0.047000
2009-03-25,0.122000
2014-03-25,0.187500
2016-09-26,0.196500
2017-12-19,0.329000
2018-06-26,0.273000
2024-06-11,0.470000
2014-09-24,0.192000
2017-06-27,0.208500
2018-09-26,0.297000
2020-06-15,0.264500
2022-12-13,0.258000
2024-12-17,0.535000
2010-03-25,0.064500
2019-03-20,0.282000
2022-03-24,0.286000
2000-12-13,0.121250
2007-09-26,0.104500
2008-09-25,0.146000
2013-09-24,0.146000
2021-12-13,0.494000
2025-09-16,0.511000
2002-03-11,0.034000
2005-03-28,0.107500
2011-06-23,0.093500
2012-09-25,0.120500
2023-03-23,0.330000
2026-06-15,0.540000
2006-12-21,0.123500
2008-03-25,0.018500
2008-06-24,0.122500
2009-12-24,0.139000
2010-12-23,0.168000
2014-12-24,0.253500
2021-09-24,0.507000
2003-03-10,0.035750
2003-12-15,0.052500
2004-06-28,0.071500
2004-12-27,0.140000
2006-06-23,0.100500
2007-03-26,0.111500
2012-03-26,0.103500
2017-09-26,0.237500