f/overrides/event-backup/fdhy-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
2019-01-29,0.156000
2020-12-29,0.198000
2022-09-28,0.221000
2023-06-28,0.251000
2024-04-26,0.268000
2024-12-30,0.307000
2022-08-29,0.200000
2025-08-28,0.274000
2018-08-29,0.222000
2020-02-26,0.175000
2020-03-27,0.201000
2020-04-28,0.215000
2020-09-28,0.194000
2022-03-29,0.194000
2025-12-30,0.302000
2026-01-29,0.236000
2024-05-30,0.271000
2018-10-29,0.221000
2020-07-29,0.211000
2020-11-25,0.181000
2021-11-26,0.195000
2022-05-26,0.202000
2023-01-27,0.221000
2019-08-28,0.202000
2022-02-24,0.197000
2025-06-27,0.276000
2021-04-28,0.171000
2021-09-28,0.189000
2021-10-27,0.190000
2024-03-26,0.262000
2026-07-30,0.264000
2025-11-26,0.250000
2019-09-26,0.197000
2020-01-29,0.185000
2020-06-26,0.205000
2020-10-28,0.206000
2021-02-24,0.167000
2025-09-29,0.252000
2020-08-27,0.217000
2023-04-26,0.242000
2023-11-28,0.256000
2025-07-30,0.272000
2024-07-30,0.253000
2026-05-28,0.260000
2019-02-26,0.228000
2019-04-26,0.195000
2021-07-28,0.189000
2021-12-03,1.128000
2023-05-26,0.247000
2024-06-27,0.265000
2019-12-06,0.242000
2020-12-04,0.808000
2023-10-27,0.290000
2025-01-30,0.267000
2025-03-28,0.290000
2026-03-30,0.269000
2026-02-26,0.270000
2018-06-27,0.122000
2021-01-27,0.182000
2021-03-29,0.155000
2023-08-29,0.257000
2023-09-27,0.254000
2025-05-29,0.264000
2019-06-26,0.198000
2020-05-27,0.219000
2022-01-27,0.180000
2024-01-29,0.256000
2018-12-27,0.247000
2019-11-26,0.197000
2024-11-27,0.258000
2026-06-29,0.271000
2018-07-27,0.233000
2021-08-27,0.184000
2022-12-28,0.225000
2024-09-27,0.246000
2025-04-29,0.274000
2025-10-30,0.264000
2019-10-29,0.195000
2023-03-29,0.241000
2024-02-27,0.265000
2024-08-29,0.261000
2024-10-30,0.263000
2022-04-27,0.196000
2022-06-28,0.199000
2018-09-26,0.221000
2018-11-28,0.207000
2019-03-27,0.187000
2019-07-29,0.209000
2019-12-27,0.212000
2021-12-29,0.206000
2023-02-24,0.229000
2023-12-27,0.271000
2026-04-29,0.276000
2023-07-27,0.240000
2025-02-27,0.251000
2019-05-29,0.214000
2021-05-26,0.184000
2021-06-28,0.184000
2022-07-27,0.207000
2022-10-27,0.218000
2022-11-28,0.216000