f/overrides/event-backup/dxj-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
2009-03-23,0.211000
2010-12-22,0.264000
2015-12-21,2.620000
2023-03-27,0.625000
2024-03-22,0.305000
2006-12-21,0.209000
2013-12-24,0.992000
2018-12-24,0.262000
2019-12-23,0.664000
2020-06-23,0.586000
2021-09-24,0.065000
2025-09-25,0.140000
2015-09-21,0.036000
2017-06-26,0.830000
2019-03-26,0.020000
2019-06-24,0.578000
2022-09-26,0.130000
2023-09-25,0.012000
2024-06-25,0.518000
2014-06-23,0.546000
2014-12-19,5.172000
2015-06-22,0.324000
2016-12-23,0.496000
2019-09-24,0.065000
2021-12-27,1.110000
2022-06-24,0.750000
2007-12-17,0.479000
2023-06-26,0.782000
2024-12-26,2.883000
2011-12-21,0.270000
2013-06-24,0.247000
2016-09-26,0.050000
2021-06-24,0.473000
2018-06-25,1.092000
2009-06-22,0.338000
2009-12-21,0.183000
2010-06-28,0.185000
2012-06-25,0.316000
2012-09-24,0.004000
2016-06-20,0.435000
2017-09-26,0.045000
2022-12-23,1.065000
2024-09-25,0.135000
2025-12-26,0.385000
2026-06-25,1.155000
2008-12-22,0.800000
2011-06-22,0.476000
2012-12-24,0.233000
2017-12-26,0.492000
2020-12-21,0.792000
2023-12-22,1.610000
2025-06-25,1.340000