f/overrides/event-backup/mctox-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
2022-03-30,0.210000
2024-10-31,0.092000
2025-09-30,0.095000
2025-11-28,0.127000
2026-03-31,0.085000
2026-07-31,0.085000
2022-09-29,0.210000
2024-02-29,0.086000
2024-12-31,0.156000
2025-02-28,0.088000
2026-01-30,0.085000
2021-12-30,0.187000
2022-06-29,0.225000
2022-12-29,0.195000
2023-06-29,0.281000
2025-04-30,0.085000
2021-12-16,0.103000
2023-12-18,0.543000
2024-01-31,0.086000
2025-03-31,0.091000
2025-06-30,0.091000
2026-02-27,0.085000
2024-08-30,0.098000
2024-09-30,0.093000
2025-08-29,0.093000
2024-04-30,0.094000
2025-01-31,0.095000
2025-07-31,0.096000
2022-12-16,0.228000
2024-03-28,0.089000
2024-05-31,0.073000
2024-06-28,0.117000
2024-07-31,0.090000
2026-04-30,0.085000
2026-06-30,0.085000
2023-03-30,0.201000
2023-09-28,0.233000
2023-12-29,0.323000
2024-11-29,0.107000
2024-12-12,0.243000
2025-05-30,0.087000
2025-10-31,0.088000
2025-12-31,0.286000
2026-05-29,0.085000