f/overrides/event-backup/ghy-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
2018-04-12,0.083000
2019-10-10,0.105000
2019-12-12,0.105000
2020-06-11,0.105000
2020-12-10,0.105000
2015-09-16,0.110000
2023-08-10,0.105000
2021-04-15,0.105000
2018-07-12,0.083000
2018-10-11,0.083000
2022-06-16,0.105000
2026-04-09,0.105000
2016-08-17,0.110000
2016-11-16,0.100000
2018-03-15,0.083000
2019-03-21,0.100000
2021-09-16,0.105000
2021-11-10,0.105000
2023-05-11,0.105000
2025-06-12,0.105000
2015-11-18,0.110000
2014-07-16,0.125000
2019-08-15,0.100000
2021-07-15,0.105000
2026-03-12,0.105000
2013-02-19,0.125000
2014-12-26,0.379000
2017-08-16,0.090000
2022-08-11,0.105000
2024-05-09,0.105000
2013-09-18,0.125000
2013-12-18,0.125000
2014-10-15,0.125000
2016-07-13,0.110000
2017-12-28,0.090000
2020-09-10,0.105000
2023-12-26,0.105000
2013-04-17,0.125000
2015-04-15,0.125000
2015-10-14,0.110000
2016-06-15,0.110000
2018-12-27,0.083000
2020-11-12,0.105000
2022-11-09,0.105000
2013-10-16,0.125000
2023-10-12,0.105000
2016-10-12,0.100000
2016-02-17,0.110000
2017-05-10,0.100000
2020-05-14,0.105000
2021-03-11,0.105000
2023-07-13,0.105000
2024-06-13,0.105000
2014-05-19,0.125000
2015-05-13,0.125000
2021-12-27,0.105000
2024-09-12,0.105000
2026-06-11,0.105000
2014-02-19,0.125000
2015-12-16,0.110000
2020-02-13,0.105000
2020-08-13,0.105000
2025-03-13,0.105000
2025-08-14,0.105000
2015-07-15,0.125000
2016-09-14,0.100000
2024-03-14,0.105000
2024-08-08,0.105000
2025-12-26,0.105000
2015-12-28,0.110000
2018-02-15,0.090000
2019-02-14,0.083000
2019-12-26,0.105000
2021-08-12,0.105000
2021-12-16,0.105000
2023-06-15,0.105000
2023-09-14,0.105000
2016-12-14,0.100000
2025-12-11,0.105000
2024-02-15,0.105000
2018-08-16,0.083000
2026-08-13,0.105000
2023-12-14,0.105000
2024-12-26,0.105000
2025-02-13,0.105000
2025-10-16,0.105000
2013-07-17,0.125000
2017-02-15,0.100000
2018-12-13,0.083000
2013-11-18,0.125000
2019-07-18,0.100000
2019-09-12,0.105000
2021-06-10,0.105000
2014-03-25,0.125000
2017-03-15,0.100000
2017-06-14,0.090000
2017-09-14,0.090000
2020-07-16,0.105000
2021-05-13,0.105000
2022-04-13,0.105000
2022-12-27,0.105000
2013-08-19,0.125000
2024-04-11,0.105000
2014-04-15,0.125000
2016-03-16,0.110000
2018-06-14,0.083000
2020-10-15,0.105000
2024-12-12,0.105000
2013-03-18,0.125000
2013-12-27,0.125000
2015-03-18,0.125000
2016-05-11,0.110000
2018-09-13,0.083000
2022-05-12,0.105000
2024-10-10,0.105000
2025-09-11,0.105000
2013-06-18,0.125000
2019-06-13,0.100000
2019-11-14,0.105000
2020-04-16,0.105000
2023-03-16,0.105000
2025-04-10,0.105000
2018-05-10,0.083000
2014-12-17,0.125000
2015-08-19,0.125000
2017-12-14,0.090000
2022-09-15,0.105000
2022-12-15,0.105000
2025-05-15,0.105000
2026-07-09,0.105000
2013-05-20,0.125000
2026-05-14,0.105000
2021-02-11,0.105000
2022-07-14,0.105000
2018-11-15,0.083000
2016-12-28,0.100000
2017-10-12,0.090000
2020-12-28,0.105000
2021-10-14,0.105000
2022-10-13,0.105000
2015-06-17,0.125000
2014-09-17,0.125000
2017-07-12,0.090000
2019-04-17,0.100000
2024-07-11,0.105000
2025-11-13,0.105000
2026-02-12,0.105000
2014-08-19,0.125000
2015-02-19,0.125000
2017-04-11,0.100000
2020-03-12,0.105000
2022-02-10,0.105000
2023-02-09,0.105000
2024-11-14,0.105000
2014-06-18,0.125000
2017-11-16,0.090000
2022-03-17,0.105000
2023-04-13,0.105000
2023-11-08,0.105000
2025-07-10,0.105000
2014-11-18,0.125000
2019-05-16,0.100000
2016-04-13,0.110000