f/overrides/event-backup/ixp-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
2006-12-21,1.512000
2007-12-24,1.521000
2010-06-21,1.474000
2019-06-17,0.889000
2022-12-13,0.191000
2025-12-16,3.116000
2014-12-19,1.078000
2015-12-29,0.055000
2016-12-22,1.282000
2017-12-21,1.035000
2021-06-10,0.317000
2021-12-13,1.163000
2011-12-19,1.308000
2013-12-17,0.980000
2022-06-09,0.589000
2023-06-07,0.457000
2024-12-17,0.856000
2011-06-21,1.725000
2015-12-21,1.136000
2016-06-21,1.078000
2018-06-19,1.295000
2005-12-23,1.231000
2009-12-21,0.879000
2012-06-20,1.584000
2025-06-16,0.498000
2019-12-16,0.447000
2020-12-14,0.409000
2001-12-24,0.015000
2003-12-22,0.646000
2013-06-25,1.345000
2014-06-24,6.370000
2015-06-24,1.061000
2017-06-20,1.026000
2023-12-20,0.469000
2026-06-15,0.812000
2002-12-23,0.640000
2004-12-23,0.668000
2008-12-22,0.966000
2009-06-22,1.333000
2010-12-20,0.993000
2018-12-18,0.871000
2003-12-16,0.160000
2008-06-23,1.428000
2012-12-17,1.140000
2020-06-15,0.297000
2024-06-11,0.446000