f/overrides/event-backup/ddls-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
2020-06-23,0.285000
2019-09-24,0.215000
2019-12-23,0.301000
2025-03-26,0.125000
2017-06-26,0.235000
2017-09-26,0.125000
2022-09-26,0.295000
2024-03-22,0.240000
2025-12-26,0.337000
2016-06-20,0.445000
2016-09-26,0.205000
2020-03-24,0.071000
2022-03-25,0.110000
2023-06-26,0.440000
2025-06-25,0.745000
2017-12-26,0.082000
2019-06-24,0.695000
2026-03-26,0.100000
2022-06-24,0.635000
2023-12-22,0.235000
2020-12-21,0.343000
2021-06-24,0.480000
2024-06-25,0.525000
2017-03-27,0.095000
2018-06-25,0.442000
2020-09-22,0.275000
2021-03-25,0.014000
2021-09-24,0.400000
2023-03-27,0.330000
2024-09-25,0.275000
2025-09-25,0.425000
2016-12-23,0.251000
2018-09-25,0.039000
2022-12-23,0.244000
2023-09-25,0.335000
2024-12-26,0.396000
2026-06-25,0.765000
2021-12-27,0.225000
2022-12-07,0.345000