f/overrides/event-backup/iyj-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
2002-09-13,0.055500
2003-09-12,0.035500
2006-06-22,0.036500
2020-12-14,0.275000
2026-03-17,0.272000
2001-03-09,0.041500
2019-09-24,0.246000
2022-06-09,0.220000
2001-12-14,0.032500
2008-12-23,0.156000
2009-06-24,0.104000
2021-06-10,0.207000
2026-06-15,0.215000
2006-12-20,0.118000
2020-03-25,0.271500
2020-06-15,0.217500
2003-12-12,0.080000
2004-09-24,0.050000
2014-12-24,0.272500
2018-03-22,0.219500
2010-09-23,0.202500
2015-09-25,0.186500
2021-03-25,0.192000
2023-09-26,0.295000
2011-09-23,0.121000
2012-06-19,0.122500
2004-03-26,0.056500
2007-12-27,0.147000
2015-12-24,0.221500
2025-06-16,0.262000
2000-07-19,0.012000
2006-09-26,0.134500
2010-06-24,0.096000
2012-12-19,0.172500
2002-12-13,0.065500
2005-03-24,0.071500
2005-09-23,0.065000
2004-06-25,0.022000
2016-12-21,0.256000
2022-03-24,0.258000
2010-12-22,0.120000
2012-12-27,0.033500
2013-06-26,0.140500
2018-06-26,0.236500
2007-03-23,0.097500
2017-03-24,0.248000
2017-09-26,0.252000
2021-12-13,0.206000
2017-06-27,0.246000
2001-06-08,0.011000
2008-09-24,0.125000
2011-03-25,0.103000
2003-12-31,0.005000
2009-03-25,0.153500
2012-09-25,0.157500
2017-12-19,0.205000
2022-09-26,0.288000
2000-12-20,0.104000
2013-09-24,0.146500
2019-06-17,0.238500
2025-09-16,0.416000
2016-06-21,0.180500
2018-12-17,0.231000
2001-10-01,0.065000
2003-06-13,0.023000
2010-03-25,0.089500
2014-06-24,0.148000
2016-09-26,0.193000
2025-03-18,0.275000
2011-12-22,0.150500
2002-06-14,0.018000
2007-09-25,0.097000
2008-03-25,0.108000
2022-12-13,0.248000
2019-12-16,0.297000
2013-03-25,0.115500
2015-03-25,0.170500
2019-03-20,0.322000
2005-06-20,0.032500
2007-06-28,0.097000
2009-09-22,0.092000
2003-03-07,0.053000
2008-06-25,0.109000
2015-06-24,0.206500
2023-03-23,0.272000
2025-12-16,0.270000
2023-12-20,0.358000
2004-12-23,0.104000
2005-12-22,0.150500
2009-12-23,0.106500
2014-03-25,0.226500
2014-09-24,0.130500
2021-09-24,0.249000
2024-09-25,0.302000
2002-03-08,0.040500
2003-12-16,0.044000
2011-06-24,0.117000
2013-12-23,0.177500
2020-09-23,0.216000
2016-03-23,0.205000
2024-03-21,0.243000
2024-06-11,0.264000
2024-12-17,0.369000
2006-03-24,0.060000
2018-09-26,0.231000
2023-06-07,0.275000
2000-10-18,0.025000
2012-03-26,0.122000