f/overrides/event-backup/fxz-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
2008-06-23,0.101000
2010-12-21,0.300000
2012-12-21,0.450000
2023-12-22,0.310000
2015-06-24,0.074000
2020-09-24,0.241000
2021-09-23,0.173000
2023-03-24,0.247000
2023-09-22,0.322000
2026-03-26,0.244000
2014-09-23,0.115000
2019-03-21,0.080000
2025-06-26,0.233000
2010-06-22,0.082000
2016-09-21,0.084000
2017-06-22,0.126000
2018-12-18,0.174000
2019-12-13,0.203000
2013-06-21,0.103000
2022-12-23,0.257000
2023-06-27,0.482000
2025-09-25,0.309000
2011-06-21,0.076000
2025-03-27,0.213000
2009-06-23,0.078000
2013-09-20,0.058000
2014-12-23,0.241000
2021-06-24,0.148000
2024-06-27,0.211000
2015-12-23,0.147000
2017-12-21,0.143000
2014-03-25,0.084000
2016-12-21,0.172000
2017-03-23,0.088000
2022-09-23,0.345000
2008-12-23,0.124000
2014-06-24,0.106000
2015-09-23,0.101000
2019-06-14,0.080000
2020-12-24,0.190000
2024-09-26,0.285000
2025-12-12,0.373000
2012-06-21,0.274000
2015-03-25,0.033000
2016-03-23,0.086000
2017-09-21,0.087000
2018-06-21,0.145000
2019-09-25,0.270000
2026-06-25,0.162000
2018-03-22,0.032000
2021-03-25,0.130000
2022-06-24,0.249000
2024-12-13,0.336000
2009-12-22,0.172000
2013-12-18,0.083000
2020-06-25,0.149000
2024-03-21,0.193000
2007-12-21,0.074000
2013-03-21,0.048000
2016-06-22,0.083000
2018-09-14,0.113000
2020-03-26,0.145000
2021-12-23,0.241000
2022-03-25,0.093000