f/overrides/event-backup/ewc-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
2000-08-24,5.057000
2025-12-16,0.475000
1998-12-22,0.055000
2009-06-23,0.090000
2010-06-23,0.180000
2015-06-25,0.212000
2023-12-20,0.486000
1996-12-23,0.023000
1999-08-25,0.566000
2003-12-22,0.202000
2014-12-17,0.385000
2020-06-15,0.258000
1998-08-25,0.642000
2008-06-25,0.117000
2010-12-21,0.318000
1999-12-21,0.004000
2004-12-23,0.198000
2006-12-20,0.285000
2023-06-07,0.346000
1997-12-23,0.070000
2012-12-18,0.377000
2013-06-27,0.304000
2021-06-10,0.233000
2022-06-09,0.276000
2022-12-13,0.491000
2007-12-24,0.389000
2014-06-25,0.235000
2018-06-19,0.224000
2018-12-18,0.409000
2025-06-16,0.306000
2005-12-23,0.149000
2003-12-16,0.030000
2019-12-16,0.394000
2020-12-14,0.385000
2024-12-17,0.550000
2026-06-15,0.275000
1996-08-26,0.041000
1997-08-25,0.169000
2001-12-24,0.010000
2008-12-23,0.327000
2012-06-21,0.216000
2013-12-18,0.388000
2024-06-11,0.349000
2011-12-20,0.353000
2015-12-21,0.290000
2016-06-22,0.196000
2016-12-21,0.263000
2000-12-20,0.292000
2017-12-19,0.369000
2021-12-13,0.478000
2001-08-24,0.075000
2002-12-23,0.030000
2009-12-22,0.241000
2011-06-22,0.206000
2017-06-20,0.215000
2019-06-17,0.253000