f/overrides/event-backup/crsox-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
2006-12-27,0.768000
2017-12-29,0.828000
2019-12-27,0.060000
2023-07-11,0.203000
2025-10-10,0.195000
2026-07-10,0.410000
2005-03-31,0.186000
2023-03-31,0.219000
2006-03-30,0.456000
2010-04-30,0.204000
2022-07-11,1.616000
2024-12-20,0.142000
2020-03-31,0.036000
2022-03-31,0.156000
2005-06-30,0.324000
2007-06-29,0.696000
2007-12-31,0.936000
2008-12-31,0.288000
2009-12-31,3.216000
2019-06-28,0.078000
2024-07-11,0.202000
2019-03-29,0.102000
2021-12-22,10.007000
2007-03-30,0.426000
2008-06-30,0.234000
2011-12-16,0.072000
2018-06-29,0.132000
2018-09-28,0.072000
2018-12-20,0.090000
2022-12-20,2.238000
2023-10-11,0.160000
2026-03-25,0.905000
2005-09-30,0.408000
2006-06-28,0.552000
2007-12-11,0.348000
2008-09-30,0.288000
2025-03-28,0.160000
2025-07-11,0.180000
2009-03-31,0.012000
2010-12-16,3.744000
2022-10-10,0.140000
2023-12-20,0.168000
2024-10-11,0.216000
2025-12-19,0.654000
2005-12-28,0.660000
2006-09-27,0.756000
2007-09-28,0.714000
2008-03-31,0.372000
2019-09-30,0.102000
2024-03-28,0.205000