f/overrides/event-backup/dessx-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
2008-12-18,0.110000
2010-12-17,0.122000
2023-12-19,0.558000
2017-12-19,0.656000
2005-12-20,0.020000
2010-04-30,0.035000
2006-03-24,0.040000
2009-12-18,0.164000
2020-12-17,0.704000
2021-12-17,2.538000
2022-12-19,0.674000
2015-03-24,0.045000
2015-12-17,1.198000
2012-12-19,0.159000
2016-03-23,0.202000
2019-12-18,1.164000
2025-12-17,1.468000
2007-12-18,0.806000
2008-03-24,0.074000
2016-12-19,0.907000
2006-12-19,0.265000
2011-12-19,0.111000
2014-03-24,0.030000
2024-12-18,1.815000
2013-12-18,0.111000
2014-12-18,0.687000
2018-12-19,2.712000