f/overrides/event-backup/ccrsx-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
2009-03-31,0.018000
2020-03-31,1.116000
2021-12-22,1.193000
2006-12-27,0.588000
2007-09-28,1.506000
2019-12-27,0.024000
2006-06-28,0.294000
2008-12-31,0.138000
2018-03-29,0.474000
2006-09-27,0.510000
2010-12-29,3.006000
2011-09-09,1.212000
2018-12-31,0.054000
2019-03-29,0.060000
2024-03-28,0.530000
2026-03-25,2.442000
2009-09-11,0.042000
2008-09-30,0.210000
2009-12-31,4.938000
2018-06-29,0.036000
2018-09-28,0.042000
2019-09-30,0.060000
2022-03-31,4.631000
2007-06-29,0.648000
2008-03-31,0.348000
2010-09-10,0.150000
2007-03-30,0.534000
2008-09-11,4.056000
2017-06-30,2.346000
2025-03-28,0.792000
2006-03-30,0.168000
2008-06-30,0.198000
2019-06-28,0.048000
2023-03-31,4.698000
2007-12-31,0.606000