f/overrides/event-backup/fndx-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
2017-12-18,0.066000
2018-06-26,0.067000
2014-03-31,0.033667
2015-06-29,0.047000
2017-04-03,0.048000
2021-09-22,0.083667
2022-03-23,0.077000
2024-09-25,0.101667
2025-03-26,0.106000
2025-06-25,0.108000
2013-12-23,0.035333
2018-09-25,0.070667
2019-12-12,0.102333
2025-12-10,0.122000
2021-06-23,0.075000
2023-09-20,0.091667
2023-12-06,0.106333
2024-12-11,0.115000
2014-09-29,0.042000
2016-10-03,0.056667
2017-09-18,0.063667
2020-06-24,0.082333
2021-12-30,0.003000
2022-12-07,0.100667
2023-06-21,0.092333
2024-03-20,0.095000
2014-12-22,0.045333
2016-06-27,0.055667
2020-03-25,0.075000
2018-03-16,0.058333
2019-03-20,0.069333
2019-09-25,0.073000
2026-06-24,0.118000
2013-10-01,0.006333
2015-03-30,0.038667
2015-12-21,0.057333
2022-06-22,0.098000
2023-03-22,0.086333
2024-06-26,0.105333
2026-03-25,0.112000
2016-12-19,0.057667
2020-12-10,0.079667
2021-03-24,0.067667
2018-12-12,0.075333
2020-09-23,0.108333
2021-12-08,0.092000
2022-09-21,0.092333
2014-06-30,0.042000
2015-09-28,0.049000
2017-06-26,0.055333
2019-06-26,0.072333
2025-09-24,0.109000