f/overrides/event-backup/npct-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
2021-10-14,0.103000
2024-10-15,0.119000
2022-02-14,0.103000
2024-06-14,0.119000
2024-07-15,0.119000
2024-12-13,0.119000
2022-06-14,0.103000
2023-11-14,0.083000
2024-03-14,0.092000
2025-07-15,0.108000
2025-12-15,0.099000
2022-11-14,0.103000
2023-08-14,0.083000
2025-02-14,0.119000
2025-09-15,0.108000
2025-08-15,0.108000
2026-07-15,0.090000
2022-08-12,0.103000
2022-09-14,0.103000
2024-01-11,0.083000
2024-02-14,0.092000
2024-09-13,0.119000
2025-01-15,0.119000
2025-06-13,0.108000
2026-02-13,0.099000
2021-08-12,0.103000
2022-04-13,0.103000
2022-10-13,0.103000
2023-02-14,0.103000
2023-12-14,0.083000
2025-03-14,0.119000
2022-01-13,0.103000
2023-05-12,0.083000
2024-04-12,0.092000
2025-11-14,0.108000
2023-09-14,0.083000
2026-04-15,0.099000
2025-05-15,0.119000
2026-06-15,0.090000
2021-12-14,0.103000
2022-07-14,0.103000
2023-01-12,0.103000
2023-03-14,0.083000
2023-04-13,0.083000
2023-07-13,0.083000
2022-12-14,0.103000
2021-06-14,0.103000
2021-09-14,0.103000
2024-05-14,0.092000
2024-08-15,0.119000
2022-03-14,0.103000
2024-11-15,0.119000
2025-10-15,0.108000
2026-05-15,0.099000
2023-10-12,0.083000
2026-03-13,0.099000
2021-07-14,0.103000
2021-11-12,0.103000
2022-05-12,0.103000
2023-06-14,0.083000
2025-04-15,0.119000
2026-01-15,0.099000
2026-08-14,0.090000