f/overrides/event-backup/ausf-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
2024-11-07,0.285000
2026-02-04,0.307000
2018-12-28,0.108000
2019-11-07,0.236000
2023-08-07,0.180000
2025-12-30,0.125000
2026-08-05,0.325000
2019-05-07,0.224000
2020-08-07,0.160000
2021-05-07,0.170000
2021-02-05,0.160000
2022-02-07,0.190000
2023-11-07,0.180000
2026-05-06,0.325000
2020-11-06,0.160000
2022-08-05,0.180000
2025-02-07,0.285000
2021-08-06,0.180000
2022-12-29,0.050000
2023-02-07,0.160000
2025-05-07,0.290000
2018-11-08,0.215000
2019-08-07,0.230000
2020-05-07,0.175000
2024-08-07,0.270000
2025-08-07,0.295000
2025-11-07,0.295000
2021-12-30,0.020000
2022-05-06,0.190000
2024-05-07,0.230000
2023-05-05,0.160000
2024-02-07,0.180000
2020-02-07,0.201000
2020-12-30,0.062000
2022-11-07,0.170000
2024-12-30,0.141000
2019-02-07,0.219000
2019-12-30,0.146000
2021-11-05,0.180000