f/overrides/event-backup/chtrx-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
2012-12-07,0.187000
1994-09-15,0.040000
2013-12-13,1.144000
2017-12-13,1.250000
2004-12-17,0.110000
1988-12-28,0.185000
1994-06-15,0.040000
1994-12-15,0.405000
1998-09-15,0.029000
1999-12-17,1.353000
2003-12-12,0.024000
1986-01-03,0.170000
1987-01-09,0.135000
1993-03-15,0.040000
1995-09-15,0.040000
1980-11-20,0.203000
2000-12-15,0.879000
2015-12-11,2.498000
2016-12-13,1.936000
2022-12-16,0.624000
1999-06-18,0.005000
1998-12-18,0.554000
2018-12-14,1.717000
2025-12-18,1.542000
1995-03-15,0.040000
1987-12-29,1.520000
1991-12-16,0.398000
1992-12-15,0.165000
2005-12-16,0.123000
2006-12-15,0.107000
1981-11-18,0.327000
1995-12-15,0.941000
1996-06-14,0.040000
1997-09-15,0.040000
2011-12-09,0.103000
1989-12-27,0.675000
1994-03-15,0.040000
1996-09-13,0.040000
1997-03-14,0.040000
1998-03-13,0.040000
2014-12-12,2.428000
2019-12-13,2.935000
1983-12-09,0.173000
1993-09-15,0.040000
1999-03-19,0.015000
2007-12-14,0.223000
2024-12-16,1.564000
1993-06-15,0.040000
2021-12-16,3.145000
2010-12-10,0.066000
1998-06-15,0.030000
2023-12-15,1.060000
1985-01-03,0.180000
2009-12-11,0.092000
1993-12-15,0.198000
1996-03-15,0.040000
2008-12-12,0.154000
2020-12-15,0.415000
1990-12-17,0.460000
1997-12-15,1.338000
1996-12-16,0.674000
1995-06-15,0.040000
1997-06-13,0.040000
1982-11-18,0.320000