f/overrides/event-backup/aagox-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
1997-05-29,0.127000
2007-05-31,0.154000
2008-05-14,0.087000
2009-09-16,0.007000
2020-12-16,13.778000
1993-04-30,0.025000
1996-05-15,0.022000
2009-05-13,0.200000
2012-05-08,0.280000
2012-12-18,0.273000
2016-12-14,0.193000
2017-12-15,6.044000
2019-12-18,1.207000
1995-05-04,0.070000
1999-05-06,0.079000
2025-12-17,12.496000
2022-12-15,2.782000
2001-05-29,0.102000
2015-12-16,6.615000
2021-12-15,23.302000
1991-04-30,0.047000
1992-04-29,0.031000
2013-12-18,0.445000
2014-12-18,11.000000
1990-04-30,0.060000
1994-05-09,0.033000
1998-05-29,0.128000
2018-12-18,11.667000