f/overrides/event-backup/a-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
2017-06-29,0.132000
2021-07-02,0.194000
2025-09-30,0.248000
2020-03-30,0.180000
2024-12-31,0.248000
2021-01-04,0.194000
2014-04-09,0.094421
2026-06-30,0.255000
2014-09-26,0.094421
2019-09-30,0.164000
2020-06-29,0.180000
2023-04-03,0.225000
2024-07-02,0.236000
2019-12-30,0.180000
2022-01-03,0.210000
2026-01-06,0.255000
2012-03-30,0.071531
2018-12-28,0.164000
2017-10-02,0.132000
2018-04-02,0.149000
2022-12-30,0.225000
2023-10-02,0.225000
2023-06-30,0.225000
2006-11-01,1.471388
2013-12-27,0.094421
2018-10-01,0.149000
2019-07-01,0.164000
2022-10-03,0.210000
2013-06-28,0.085837
2016-06-30,0.115000
2025-04-01,0.248000
2017-12-29,0.149000
2018-07-02,0.149000
2025-07-01,0.248000
2012-09-28,0.071531
2012-12-27,0.071531
2013-03-28,0.085837
2014-06-27,0.094421
2015-09-25,0.100000
2016-12-29,0.132000
2021-04-05,0.194000
2015-12-31,0.115000
2016-04-01,0.115000
2016-09-30,0.115000
2019-04-01,0.164000
2020-10-05,0.180000
2015-03-27,0.100000
2021-10-04,0.194000
2022-04-04,0.210000
2022-07-01,0.210000
2023-12-29,0.236000
2015-06-26,0.100000
2017-03-31,0.132000
2024-04-01,0.236000
2024-10-01,0.236000
2026-03-31,0.255000
2012-06-29,0.071531
2013-09-27,0.085837
2015-01-02,0.100000